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Cell Phone Repair Shop

24 Sep 2018
With the increasing number of cell phones in the world, the industry of smartphone repair shows a lot of opportunities. as already businessman in this field shopkeeper can gain more than a cell phone repair technician would. But, it isn’t easy to start your own phone repair store? The first step to start your own cell phone repair business is to learn cell phone repairing step by step basic to advance. In this blog post, I will only be telling you how to learn cell phone repairing free of cost from the websites:

The easiest way to learn such a practical skill is to learn by doing. in the beginning, it is important to try to repair your own mobile phones first. Try to identify the problem and use the above blog and website to find the solution. As you repair more and more mobile phones, you will able to get the basic skills to know phone repairing. So, don't wait around too long to fix your faulty phone first. A step by step training under the mobile phone technician plus instructor is the best way to learn a cell phone repairing because phone technician plus instructor not only covers the technical education it also teaches you everything about managing the mobile repair shop as well. we have compiled this blog post for do-it-yourselfers who want to do basic repairs as well as beginners who wish to increase their knowledge.

If you wish to learn smartphone repairing professionally and be an expert technician in the field, you can join our paid smartphone repairing course. we well come everyone to entering in this field to try gain knowledge to get enrolled in a course for more expertise and confidence.
We suggest you start with a home-based business before expanding into a complete mobile repairing store if you don't know the field of phone repairing. It helps you get the good experience which will result in fewer mistakes when you are planning to do big in the future.

Starting Your First Cell Phone Repairing Workshop

how to start a cell phone repair business from home
guide to starting repairing
in the beginning, you need to find a place in your home for doing cell phone repairing jobs concentrate without being disturbed and in starting you need a laptop and internet. in your home workstation, you have to arrange all the necessary cell phone repairing tools that are needed to repair hardware and software faults of smartphones. for a full-fledged mobile repairing store, you will need shop furniture, staff, and money in the starting. at home, you already have these facilities or at starting you don't need any staff and your expenditure will cut down half. If you are busy in the daytime with your job you can choose evening hours for working mobile repairing.working from home leads you to limited customers access as compared to the cell phone repair shop to solve this problem you can use google or bing local listing program. in starting you could collect the faulty smartphones from the customers, or they could deliver it to you at your home it will increase your home base cell phone repair business in days. for repair phone from home you need cell phone spare parts you can ask different wholesale shops and online spare part suppliers to supply you genuine parts at you home. you can distribute flyers to your office friends and your neighborhood and rely on them for word of mouth publicity remember, starting your cell phone maintenance business from your home is always a good idea to minimize costs after a few years, you will able to move to a cell phone repair store of your own

How to Start A Cell Phone Repairing Shop In Asia

For starting a cell phone repairing on the commercial level first, you have to find a shop on renting, then you have to arrange some smartphone brand accessories, and figure out how repairs are carried out. in many countries and cities in Asia, cell phone repair business has become very common. So you can open a cell phone repair shop in any famous cities easily. mobile repairing business in a mobile mall is very good and profitable. If you chose a proper location in your city, you can earn a monthly amount.
Nowadays, however, people believe in getting their new phones repaired instead of replacing them. because the price of Apple, Samsung, Huawei, Honor, Nokia, Motorola, ZTE, Vivo, Qmobile, Oppo, Infinix Mobile, Sony Mobile, LG, and HTC smartphones is comparatively higher now. this proves profitable to the smartphone repair industry. to repair today's smartphones. you need a proper understanding of all the internal components and chips of a smartphone. to expand your smartphone repairing business you have to work with other mobile repairing shops or phone repair store part-time on the commission basis to gain money and practical experience about how phone repairing work is done. By working under a senior cell phone technician, you will be able to diagnose faults faster in smartphones and can fix them in a reasonable price form the others shopkeeper. with this experience and knowledge cell phone repairing shop can lead toward to success in a few days. using those phone repair store contacts you will be able to get mobile accessories and spare parts at wholesale price in the market. the cost of starting a cell phone repairing shop in new mobile malls is quite low nowadays. at first, you can begin with a few feature phone common brands repairing for a few models and then start repairing smartphones and tablet. you have to buy all the necessary tools to repair hardware and software faults to meet with the requests of your shop customers. remember the location of your cell phone repair shop is most important to get fruitful results so you need a location that can attract new customers easily.

if your shop service is precise and respectable then you can add your clients family and friends to your customer base good work is always going to win you an ever-growing clients base. you have to put your maximum efforts in the initial phase of your shop for the steady and successful start. However, it is important to provide the best services to improve further you can take clients feedback. you will know, how they feel when repairing their phones. nowadays everyone wants their smartphone to be repaired as soon as possible, customers aren't willing to wait longer because phone and tablet have all their important data inside, it is difficult for them to arrange the substitute. Hence if you want your shop to grow and earn the best reputation while you’re at it, you have to be quite fast to diagnose the smartphone faults, for doing this you can buy mobile PCB testing machine
In the starting, if you quote a low price the customer might question the repairs quality it might lead to huge losses. However, this is essential to gain vast customers. so you have to decide the repairs pricing according to your customer as well. if you repair a smartphone that could not be repaired by mobile repair shop near you will get new mobile repair customer in the market which will directly be beneficial to your shop because people love the shop where all their phone problems get solved. in many mobile cases studies, clients are willing to pay a big amount to repair their particular handset.
they hate to shift on another phone because they where familiar with it

How To Promote Your Just Start Cell Phone Repair Shop

we have the best publicity ideas for you to start promoting your cell phone repair shop today, and get very good promote cell phone repair shop of any type you can follow these offline and online marketing various methods:
Offline Marketing
In offline marketing, you can make handbills and posters to promote your shop. as you know nowadays, everybody need phone accessorises to enhance the appearance and increase the security of their latest phones. at the shop, you can offer different types of phone accessories like back cover, cases, batteries, chargers, USB cables, etc for increasing the visit of peoples to your shop. you can also increase the visits by offering mobile easy load and mobile scratch card services. the people who can’t afford new smartphones or tablet, usually buy second-hand or used smartphones. selling used phones will bring more customers to your shop. Several people are not aware of the latest technologies and apps. you can expand your visitors by offering mobile downloading services Offering these services will lead to an increase in cell phone repair work and revenue. Moreover, it ensures that person passing by your shop has more than one reason to stop by. a cell phone repair business can be quite profitable and you can earn a lot of money. the best and powerful marketing is your customer satisfaction with your shop services, If you want your phone repair shop to grow, so more customers have to come to you, more people have to know about your shop and repair services to do this, ask you're satisfied customers to told their family member and friends to come to your shop to avail phone repair service. some customers look many things to judge your shop and its services they focus on the entire experience of getting their cell phone repaired. always remember, good behavior give your customers happy and calm. most of the times, the customer get angry it can lead you to lose your multiple customers at the same time. because customers don't know the technical aspects of their smartphone, you can explain them properly. avoid getting the argument with your angry customer. remember: ‘customer mobile is a patient’. and you are the doctor. Treat a patient like a patient until he is satisfied!
Online Marketing
Way to reduce expenditure advertising online rather than offline advertising since it is more effective.
in online marketing, you can make Facebook, Google Plus page to promote your shop on social media. you can offer special discounts or coupons on the cell phone repairing. if you want to give your customers excellent service, used computer software. the computer software manages all your cell phone repair businesses like inventory and profits/losses status. the software has the feature to send text messages to your customers informing them about their phone repairing status. repairshopr is given you the free signup to test those all feature. if you like it you can buy it. you can send useful tips about smartphones to your customer so that they don’t forget about your shop service. now its very important to have your business presence on the internet, so submit your shop details to local directories and post ads in your hometown classified websites for increasing your customers form the internet. sometimes you can offer a discount sale on your shop on year occasions if you have feature phone old accessories, you can sale them using discounts offers, the discount sale will help draw more customers. if you are selling phone accessories, you can offer “Buy 1 Get 2 Free”

Read: Future Plans and Intentions in Smartphone Repairing Business for shop marketing strategy

You can take help from these useful tips to grow your cell phone repairing work to a great extent. if you have any questions on how to start a phone repair business, feel free to ask in the comment box.

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Learn Cell Phone Repair

31 Jul 2018
The first step to entering in the business of cell phone repairing is to learn to repair cell phones. but the question is how? There are different ways to learn cell phone repairing: in this article, we are introducing the Offline Course of self-teaching by the book, as we know offline cell phone repair course is not a new option to learn cell phone repairing but its primarily because the self-teaching by book offers real hands-on repair experience and direct interaction with the instructor. Offline Study with the book is also focused and fast, covering the most important learning topics about the cell phone repairing over a specific period of days. and another benefit of Offline Learning is the validation by own, without wasting too much time for searching for a person who can teach you on his cell phone repairing store, which often comes in the form of a self-made that proves your expertise. It's one thing to say you're a cell phone repair technician. on hand practices on the cell phones according to book practical activities can bolster your reputation and help you land more, better, and higher-paying work to you in cell phone repairing business. even though most books offer the robust training. Books are Convenient, not expensive and can provide training for self-study. you can learn at your own pace and it can be good instruction. Books with troubleshooting, layout, block, and schematic training diagrams represent cell phone repair training alternatives for self-motivators who want to learn on their own. Though cell phone repair books you get provide instruction, there is no need of the instructor, and no certificate to be earned. if the author explains each topic in the book in depth.
The best part about cell phone repair book is that if they're good, they can serve as references for years to come; if they're bad, you've invested very little money and you can give your used books to help the peoples how cannot afford to pay for learning cell phone repairing in there country because it is so expensive for them.

Learn Cell Phone Repairing Offline

A Do-It-Yourself Guide To Troubleshooting and Repairing Cell phones
The book targets people who would like to start and run a cell phone repair as a business
Learn Mobile Phone Repairing

We all use mobile phones and we all have problems with it. Don’t get frustrated… and don’t waste money on support calls or costly repair! Solve the problems yourself, with this Learn Cell Phone Repairing book. Using easy-to-use flowcharts, handy “symptom tables,” and clear pictures.

this Learn Cell Phone Repair ebook is Using flowcharts, handy symptom tables, and clear stepbystep pictures
some of the book pages
This updated book contains the detailed content and out-of-the-box ideas to repair your own Cell Phone successful. this book provides you the information needed to become Cell Phone Repairing technician on your own. 

activity page of the book
The fill-in-the-blank activities format makes it very easy to test your self after reading and doing cell phone repair jobs. writing the experience that you get after repair your own cell phone with the help of this book will put you on the road to success. it features in-depth it also contains Helpful Resources, Best Practices to exploit knowledge and education about cell phone repairing to improve your chances for success in a Cell Phone Repair business.

Muhammad Asif Azeemi walks you step-by-step through identifying, solving, and preventing hundreds of 2018 most aggravating cell phones problems. Azeemi covers all your major platforms:

book index

hardware, software, and more. He even helps you fix the weird problems that happen when you use multiple apps together on your smartphone! help you with his knowledge about cell phones
identify and replace faulty memory chips prevent overheating that can damage your cell phone. make you sensibly decide whether to upgrade, repair, or replace your smartphone. in this Book on cell phone repairing by the end of reading and doing you should be able to disassemble and assemble a cell phone, use the correct cell phone repair tool to diagnose the problem, know the conventional parts of modern cell phones, learn cold testing, hot testing, jumper setting checking, identify cell phone faults and repair them with the help of proper tools.
Learn Cell Phone Repair book is provided through distance learning and we trust that you will find the material useful both for studying and for future reference.

21 Outcomes of Reading (Learn Cell Phone Repairing) Book in 2018

Upon completion of this book reading you will be able to:
  1. Identify different types of cell phones
  2. Difference between Feature Phone and Smartphone
  3. Recognise Potential Hazards Associated with Cell Phone Repair
  4. What is a hazard?
  5. Cell Phone Repair Tools
  6. Factors to Consider When Choosing Cell Phone Repair tools included cost, suitability, and quality of the tools
  7. Use the correct hardware tools to repair cell phones
  8. Assembly and disassembly of a cell phone
  9. Identify the parts of cell phones
  10. Parts of a Conventional Cell Phone
  11. Learn the Skills Needed to Diagnose and Repair a Cell Phone like:
  12. Testing using a multimeter
  13. The cold testing method
  14. The hot testing method
  15. Modern Cell Phone Jumper setting
  16. Soldering
  17. Desoldering and also examined the tools used for mobile phone repair
  18.  Diagnosing and Repairing Cell Phone Faults
  19. Hardware Faults
  20. Software Faults
  21. Identify cell phone faults and solve them
We welcome your feedback related to this book and wish you all the best.  Happy Learning!

About the author,

Muhammad Asif Azeemi has spent 15 years as a mobile repairing course instructor and smartphone repair trainer, helping thousands of people work more happily with cell phone repair business. He is the author of Book, Learn Mobile Phone Repairing in Urdu and he is the founder of Mobile Repairing Online. Asif is a Certified cell phone repair technician and also run his own mobile repair store in Karachi Pakistan.

Some Related free and paid Information :

Expertise in the mobile phone repair markets of urban and Bangladesh, outlining basic patterns of repair activities, identifying main repair sites read more

Cell phone repairing business can be highly lucrative when done in the right manner. You can take help from these useful tips to grow your new mobile phone repairing work to a great extent.

The Cellphone: The History and Technology of the Gadget That Changed the World, this book explains the fundamental concepts involved in wireless communication. you can buy it from Amazon

Read more ...

Schematic Diagram for Nokia Mobile Phones

5 Jul 2018
Schematics are essential for Nokia mobile phones repair.  Unfortunately, in some countries is illegal to own Nokia mobile Schematic. They’re considered the proprietary property of the Nokia company that they belong to. In those countries, Although phone schematics are illegal to sell and distribute, there is the way to obtain these schematics online. if you want those schematics You just have to read this article start to end. Whether you have some knowledge or not about Nokia phones repairing, this article can be a very good guide for anyone around the world for downloading Nokia service manual free of cost. reading Schematic Diagram is not that difficult if you know basic electronic symbols.
Easy to read schematics all Electronics symbols most common electronic component
mobile components list
in my online sessions, I teach basic electronic theory and practical.
When learning how to repair a cell phone, it is important to identify These parts and components on the PCB
mobile phone components symbols details
If you know basic electronic component functions you can diagnose and repair faults on Nokia, iPhone, and Samsung mobiles. Looking for the book on Nokia phone repairing. Download those schematic diagrams for free to learn Nokia phone repairing. cell phone engineering can rely on this step by step Article on schematic diagram for success in the career of Nokia phone repairing.
In this Free to download Nokia Cell Phone schematic diagrams you will find following Nokia PCB diagram with IC(integrated circuit) names and description, layout diagram with electronics parts explanation and schematics for find faults and problems and how to repair any Nokia mobile of any series including 3310, 6210, 8210, 8250,1100, 2300, 1110, 1200, 2310, 2650, Lumia 900 n70  etc.
View and Download Nokia 6210 service manual online
Nokia 6210 Cell Phone Guide

Download Nokia 6210 free schematic here PDF
service manual

View and Download 8210 Nokia layout diagram here
free download nokia 8250 diagram

Free Download Nokia 8250 service manual online here
nokia 8210 free schematic

free download circuit layout diagram service manual now
Nokia N70 Symbian smartphone

nokia n70 mobile phone components identification & knowledge
hardware repair techniques
nokia 2300 ic solution diagram free download PDF manual
nokia 1100 pcb diagram
you can download this Nokia Schematic Diagram Complete PDF here

Phone Troubleshooting Diagrams Here you will find all Nokia official Schematic for educational purposes you will find all the information you need to read schematic diagrams used in the field of Nokia mobile repairing to describe customer intentions in your mobile repair processes and cell phone repair jobs.

Mobile Phone Diagram for Repair Nokia Mobile

The major focus of the mobile phone diagram for repair is on understanding the entire system by which the cell phone works. also having the schematic is useful for knowing common component frameworks in the mobiles, in the order to repair the new mobile phones, You will definitely need a schematic or solution diagram. when time to time knowledge of mobile phone diagram for repair grows, schematic diagram Author believes if you know the basics about how actually a mobile works, then diagnosing the problem and finding a solution for it will not be a big issue for you.

Cell Phone Schematic Author and Founders

The same founder of these schematics also provides an extensive phone diagram collection of schematics brands like iPhone, Blackberry, Samsung, Nokia, htc, Sony Xperia, Motorola, LG, China, Qmobile, Huawei most probably you need the schematic diagram to keep you up to date on each of the mobile brand's hardware knowledge.
PCB Diagram of Mobile Phone Free Downloading Websites

Most of us already know how to download free schematics from the internet. I am searching on search engines and they show me the copy of genuine diagrams are available for download you can find many mobile brands schematic diagrams on websites like and Here are some ideas on where to get schematics for most Nokia mobiles and for iPhone schematic its copy of genuine diagrams are for use as fixed cell phones and republished as a “phone diagram collection” posting a schematic diagram on websites create it more functional and more useful for cell phone technicians, in the beginning, seeing Nokia’s schematic is useful to the knowledge of cell phone PCB lines framework
Nokia Lumia 900 user manual online diagram for repairing function of integrated circuit
Lumia 900 PCB diagram
if you have a schematic for particular Smartphone brand repairing your cell phone troubleshooting time can be reduced to half! the schematic is shown you all the parts value, waveform, voltages, the explanation how your cell phone work, ic design, part symbols and etc. with the layout schematic you will be able to find the exact part value and finally repaired the cell phone.
Nokia 1100 2300 component layout and signal flow diagram PCB detailed troubleshooting methods
Nokia Any Diagram

There are many mobile diagrams for repair which can be tried on initial stages and problem-solving can be done without actual diagnosis. These cell phone diagrams have been explained in detail in the phone diagram collection ebook. the book also has the knowledge on the practical solutions to the problems of cell phones. Practice questions answer videos, layout diagrams, and easy to understand language makes learning process quick.

Mobile Phone Repairing Book Free Download PDF

Mobile phone repairing book has a comprehensive and detailed approach towards each and every aspect of cell phone repairing. If you wish to learn cell phone repairing in general or planning a career in cell phone repairing, this ebook can be of a lot of help to you. Detailed approach with diagrammatical illustrations and step by step instructions makes it a user friendly in the following countries Kenya, Ethiopia, Italy, Myanmar, Lithuania, South Africa, Canada, Australia, India, United Arab Emirates, United States, United Kingdom, Malaysia, Spain, Sri Lanka Nigeria, Mexico, Nepal
It is one of the best self-help ebooks available in the given category. Both beginners and experienced people can rely on the book for success in cell phone repair jobs. The reader will also get in-depth knowledge about Modern Cell Phone Practical Jumper Setting and all kinds of jumpering used to repair the cell phones. the knowing framework behind circuit saves you doing damage to cell phone PCB lines. This Nokia Schematic Collection of diagrams for latest Mobile Repairing PDF Book is free to download. make sure not to make any commercial use of the ebook. also, do not misuse the ebook. all material and content in the PDF Book is copyright of this website The PDF copy of the book is available on You can bag this book from mobilerepairingonline on your email in today by following a few easy steps.
Have a good day guys, we from team, we here want to help you find wiring diagrams on Nokia cell phones are you looking for, on this occasion we would like to convey the wiring diagram about cell phone circuit diagram book free download pdf. Hopefully, the pictures above wiring diagram can be useful
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Modern Cell Phone Practical Jumper Setting

8 Jun 2018
jumper setting is typically best when you need to connect two different points on a cell phone there could be internal disturbances in the circuit of the handset which are connecting these two points and
because of the internal disturbance or a breakage in the circuit, the father or data may not be traveling
from one point to the other easily and in those cases, we use jumper setting to try and connect those two points directly thereby ensuring the correct transmission of power, data, and piles voltage from one end to the other end but in order to determine whether you need to do jumper setting.
for example, if you're checking a battery connector you may need to first verify whether the battery connector is working properly or not before you decide to make any changes or test any connections on the cell phones

Tracing & Testing VCC main and GND points of a iPhone PCB
removed all the suspect caps on vcc main but still shorted. wanted to try freeze method, but don't know where to put power
iphone 6 battery connector

now in this iPhone, the first aspect that we were going to be checking is the connectivity between the battery connector and two other important basic electronic components that transmit power to the rest of the circuit of the cell phone now in order to test out the connectivity in the phone PCB you need to use the multimeter!
what do multimeters measure? how to use multimeter to test continuity
best multimeter for home use

if you don't know how to use multimeter check read this article first what do multimeters measure? how to use multimeter to test continuity
place the multimeter switch range on the Buzzer continuity testing mode to check whether the two probes are connected things the means a
7 Function Digital Multimeter Leads Electrical Circuit Test Meter Detector Tool
multimeter probe types
and you can hear the beep and once you hear the beep the multimeter is perfectly alright let's go ahead and test the connectivity on the board now typically we are going to be starting off with checking the battery connector

Step 1 Check Shorting on Cell Phone Battery Connector

check shorting on cell phones with multimeter We can easily check whether there is shorting in the circuit board
positive negative bsi 
Battery Connector connects the battery positive and negative to the mobile PCB internal plus and minus copper wire prints. if you don't know how to check Shortage on cell phone circuit from the battery connector read this article how to fix a short circuit iPhone

Step 2 Checking Cell Phone PCB Ground Resistance with a Multimeter

you need to identify the positive and the negative points on a battery and we already know that the negative point on the battery is what is the background connection as you see the yellow color line is the GND line of the battery that is traveling all through the mobile PCB so let's keep the probes on one end and connected and now we can hear the beep this basically means that the battery connector negative point is here. if two GND points are connected you will hear the beep sound if not you will not be able to hear a beep sound in these points by segmenting the entire negative line into smaller parts you will be able to exactly trace where the breakages in the entire negative line once the breakage is identified you will then need to use the jumper setting option and try and ensure that the wire is or the circuit is reconnected and is properly functioning
When we check the value of resistance using the multimeter is connected to the ground of the mobile PCB
ground testing

to know more about Ground Line in cell phone PCB read digital multimeter step by step guide article last paragraph

Positive Line VBB or VCC Main in iPhone PCB

now this is how we check the negative line now let's move on to the next part which is a positive line now a positive line cannot be very clearly seen like the negative line the positive line is typically connected to very specific components or ICS and supplies power to each of those components so it's not very easy to identify and it's not open unlike the negative line hence you need to ensure that you are able to trace the positive line effectively after reading through the circuit diagram of the respective iPhone PCB

Mobile Jumper Circuit Diagram Download

unless you have an iPhone Circuit Diagram in hand you may not exactly know how the positive ways is weaved it into the iPhone PCB or into the specific components of the Printed Circuit Broad so please ensure that you pick up their respective surface circuit diagram of the while phone that you are working on understand the VCC main connections that exist in it and then try and trace the connections

+VBAT(battery voltage) on Cell Phone PCBs

now one of the common things that we can do to check the positive ways is to touch the positive terminal +VBAT of the battery connector to this layup capacitor now this component is a very common component that you will find in most cell phone PCBs and this is a common place where the positive ways is usually connected you may be able to identify that in different cell phone PCBs 
check the positive ways is to touch the positive terminal +VBAT of the battery connector
capacitor on mobile PCB

to know more about layup capacitors in mobile PCBs visit How to Check Layup Capacitor in All Cell Phone Circuit
battery voltage +VBAT on Cell Phone PCBs
mobile battery connector pin

once you identify and able to detect that you will be able to touch the positive direct ways in the PCB the positive connector of the battery a connecting point to the specific non polar capacitors, resistance and other components and you can check whether the direct positive ways is intact or not that if there is a breakage here you may not be able to connect or connect the jumper wire from the battery connector VBAT

Step 3 Checking +VBAT(battery voltage) in Cell Phone Circuit

use the back end of the cell phone battery connector as you can see here in the pictures
there's a small point at the back of the battery connector which is connected to the front of the battery connector check whether you are able to get a beep sound
back point is connected to the power point
there's a small point at the back of the battery connector which is connected to the front of the battery connector so you place the one end of the meter prob tip on the back side of the battery connector point and the other on the other connecting point in the pcb and check whether you are able to get a beep sound now here you will be able to connect the jumper clearly without any issues like I just said before in the article the back point is connected to the power point you can hear the beep and from here you can connect the jumper wire to the next point for you to be able to take the positive ways ahead but you need to ensure that you read the phone circuit diagram clearly before you attempt any of this 

phone circuit diagram clearly the first step that you would do while you're testing or tracing the negative and positive ways in a cell phone circuit
power supply system in phone
so, in short, the first step that you would do while you're testing or tracing the negative and positive ways in a cell phone circuit is to understand whether the power supply system in tact and to check

if you want to learn testing or tracing the negative and positive ways faults in iPhone, Samsung PCBs take admission in smartphones problem and their solutions course   

Checking VBAT and GND both Power Supply in Your Cell Phone PCB

check whether the connectivity to the components are then the entire circuit power supply in your cell phone checking can move to further detailed
pcb diagram of mobile phone
that the first thing that you would do is check the negative line(GND) or ground which is signified by the yellow strip that you see all through you can place the probes of the multimeter at two different points or smaller segments of each of these and try and see if the connectivity is intact once that is done you can move on to the positive terminal VBAT of the battery connecting point and try and place it at the respective positive terminals of each of the components to check whether the connectivity to the positive terminal from the VBAT of the battery connector to the individual positive terminals of components are intact or not if these two are intact then the entire circuitry power supply in your cell phone is working absolutely fine once you do this checking you can then move on to do further detailed

Cell Phone Power Section

The top portion near to antenna of the cell phone circuit is called the networks section, and the bottom portion in the PCB is called the power section. Now check the cell phone power section polar and non-polar capacitors, coils, or the power clock oscillator function-specific components near the power IC when cell phone won't switch on.

What Do You Do When a Smartphone Won't Turn On?

in a smartphone, this is a common issue. to fix this in smartphone try to long press the Power Button. in many cases, the power button won’t work because the phone is basically frozen or Historically, the solution is to remove the battery, wait for 10 seconds, then reinsert the phone battery and press the power button again. This removes all the power internally form the smartphone circuit. first, try this to fix the problem. just hold down the power button for ten seconds. If this method doesn’t work, try to press the power button for a bit longer. ten seconds should be suitable for most smartphones, Many smartphones have a method to restart usually by holding down specific keys or buttons on the phone. Much like the Sony Experia and Motorola battery pull where you hold the volume down key and power key simultaneously while the mobile is powered off. Try using a laptop or car charger instead can put a quick charge on phone battery and get it to respond as well. If you have tried these methods and phone isn’t responsive due to its battery drained 100% Try charging it using a battery booster(12 volts DC adopter with Ampare) this device is used to boost mobile phone batteries if you don't know how to use this device to fix the dead cell phone batteries read digital multimeter step by step guide article DC Current Measuring topic.
phone power on after boosting the battery with the battery booster
phone turn on vibrate
If smartphone power on after you boost the phone battery with the battery booster, but boot process fails,
the android phone is freezes on the startup screen, or it immediately reboots or shuts off there is a problem with phone software
stuck on logo samsung
the phone is freezes on the startup screen, or it immediately reboots or shuts off there is a problem with device’s software. In this case, you have to perform a factory reset of your Android smartphone form recovery mode. Note that will erase the data of customer phone to reset it back to phone default software state. you can also use this method when someone smartphone is unusable due to crashing or freezing software.
to perform the factory reset from recovery mode turn the phone off  then boot it up with one of the following button combinations:
Hold Volume Up + Volume Down + Power.
Hold Volume Down + Home + Power.
Hold Home + Power.
If none of these button combinations work, try performing a Google search by typing android phone name and hard reset keys to find the correct key combination of customer device. for example
(Samsung s3 hard reset keys)
perform a factory reset of your Android smartphone form recovery mode
android boot recovery mode
press the key combination until the Recovery mode option appears on the phone screen.
Note that will erase the data of customer phone to reset it back to phone default software state
samsung factory reset code
then Select the wipe data/factory reset option.
Choose wipe data/factory Reset option using volume keys and hold the Power button to enable
performing hard reset
Select the Yes to continue.
If your phone is screen locked you can do a Factory Reset Select the Yes to continue
hard reset screen
if smartphone refuses to switch on normally after performing hard reset try to flash it.
you can't enter into the menu with your google account or if you have a problem with the OS
refuses to switch on normally
if smartphone refuses to switch on after flashing it may be broken inside. then performing a Google search by typing android phone name and service manual to find the phone schematic diagram. then check VBAT and GND both Power Supply in smartphone PCB with the help of the schematic diagram.
I think to learn about jumper settings and how do we do the jumper settings on phone PCBs one article is not enough for you to understand the process for identifying where the circuit is broken in the negative and positive line of a mobile PCB in Dead, Not Charging, Battery Consumption, Auto-Off, water Damaged, Fallen Damaged, NO Vibration, No Tones, No Network, No Ear speaker Voice, No Mic Voice, LCD Disappear faults.
I will tell you those faults step by step jumper setting  in my next article so keep visiting my blog,
I hope you would have understood how to test positive and negative power supply in your cell phone PCB and we hope that you will continue to keep learning more about how to repair cell phone prints
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Digital Multimeter Step by Step Guide

23 May 2018
hi, I am sure all of my blog reader understand that in the field of mobile phone repairing multimeter is a very the important tool without a multimeter you will not be able to measure anything in the field of the cell phone repairing so come let we try and understand how we can use the digital multimeter to measure AC current and DC voltage and how we can check basic electronic components

Digital Multimeter Function

the device you can see in the picture is a digital multimeter. the reason why we call this a digital multimeter is that of its measures and gives you the results in the form of digits as you can see in the picture
digital multimeter measures gives results in digits is more accurate measure current
introduction definition
the digits are very clearly displayed on the picture and that is one of the reasons why this is called a digital multimeter because digits will help you understand the results of whatever you are checking very easily
digits clearly displayed help you understand the results
accurate reading in digits

Multimeter Probes
two probes specific positions in the digital multimeter to placed at a point written ohms and Com
probes place diagram
now, first of all, you need to understand what probes are as you can see there are two probes which are commonly used with analog and digital multimeters the first one is a black colored one the second one is a red colored one 
two probes commonly used with analog and digital multimeters black colored red colored
red black probes
and these two probes have very specific positions where you need to place them on the multimeter now the first one is a black probe now the black probe has to be placed at a point where it is written as Com which basically signifies a common range so the black probe has to be placed only in the common range 
place it there and press it will fit in tightly there see a symbol written voltage ampere ohms
measure electronic components
place it there and press it and it will fit in tightly there right above that  you will see a symbol where it is written as voltage-ampere M a this is where you take readings of voltage-ampere etc and you place the red probe here press it tightly so it can fit in right above that is another point where you can check higher values of electricity with the meter however commonly in a multimeter we normally use the red and black probes and that is more than enough to measure a lot of the electronic components. Right now let us try and understand what are these other readings that are displayed on the multimeter

Direct Current and Alternating Current Voltage Checking

now on the left-hand side top, you will see something written as V followed by a dash and a few dots there now this is the symbol for DC so on the left-hand side basically when you turn the Range Switch to the left you will be able to check the DC voltage somewhere ranges in the where
left-hand side top written as V by a dash dots the symbol of DC Range Switch
check DC voltage here
the range is between 20 volts two thousand words so you can check DC voltage by placing the Range Switch at the respective voltage point if you have a smaller voltage to be checked like cell phone battery you can place it at 20 volts

DC Current Measuring

now let's try and understand how we can check DC we are going to be using a battery booster to test this so we switched on the 12 volts DC adopter with Ampare 
digital multimeter how to use testing voltage on 12 volts DC adopter with Ampare
for repair cell phone battery
this is a device that is used to boost cell phone batteries and we are going to connect the output wire of this to the probes and we are going
boost cell phone batteries connect the adopter output wire to the battery terminal
boost mobile phone battery
to be testing the voltage of the output now we connect the two output wires of the booster to the two probes of the multimeter make sure that you connect it to the right and so the black and the
how you do your measurements of  DC voltage on mobile phone battery
three point eight volts
black red in the red and you can see this is around three point eight (3.8)volts so this is the DC voltage that we have measured and you can measure DC voltage by placing it at the Range Switch at the right position on the DC voltage set so whenever this is typically how you do your measurements of AC and DC voltage
switch off multimeter battery inside gives the power to display the digits on the reading scale
meter digital
whenever you are done with using the multimeter please switch it off because typically all these multimeters have a battery inside them so the battery is what gives the power to the multimeter to display the digits on the reading scale so if you beep it switched on the battery can drain off very easily and you may not be able to use it when you need it on the right-hand side, you see something like a V followed by an ampersand sign now this is where on the right-hand side, you check the AC voltage requires 200 volts or less requires the Range Switch to be placed at the 200 volts points higher value equipment can be measured using the 750-volt point so these are the two most important ways of measuring AC and DC voltage using a multimeter the range is between 200 volts to 750 volts
how ac voltage is measured check ac voltage with a digital multimeter
range switch of ac
Use Our Definitive Best multimeter Review try before you buy what is a multimeter used for Video specifications 2 Best Multimeters of 2018 Top Picks for Cell Phone Repairing

AC Current Measuring

now let's try checking at home typically the voltage that we have is between 120 or 230 volts we will turn the range switch now and place it at the 750 volt AC point and we will connect this to the main power plug to check the voltage now in many of the houses is between 220 volts voltage is usually available at the circuit boards electricity at your house and whenever you want to check whether you are getting the right voltage or not you use the multimeter place it place the Range Switch at the 750 volt position and we try and place the two probes in two points on the plug point you can see
use a multimeter to test voltage of live wires measure voltage at home
measure ac voltage with a multimeter
the wires are being plugged in into two points on your plug point and this is exactly where you get 120 to 230 volts once the probes are placed there and as you can see we can see the reading here it shows 120 now going further down you will see a few more micro readings on the right-hand side which is for smaller readings that can be measured using the multimeter, however, let us focus on those readings that are very important that we commonly use using a multimeter so let us go ahead and try and understand a few more checking cell phone components checking cell phone basic electronic components at multimeter ohms now right below the DC voltage you will see a few ohm reading is given there
Range Switch to check the value of resistance when you check cell phone basic electronic components
understanding ohm readings
this is where you place the Range Switch to check the value of resistance when you check cell phone basic electronic components (resistance) which ranges from 200 ohms to 2000 kilo ohms and that is how you turn the Range Switch there you can place it at the respective point and check the resistance value

what is SMD polar capacitor and How to check Non-Polar Capacitor with the digital multimeter click here

How Do You Check Continuity Beep on Cell Phone PCB

this point is called the buzzer or continuity testing in digital multimeter
test continuity
the next one that we will understand is where we the continuity or beep testing comes now this is a very essential component when you do when it is an essential test when you are doing tracing or testing of cell phone PCBs or laptop motherboard for that matter this reading or this point is called the buzzer or continuity testing
how to use digital multimeter for mobile repairing the probes together you will hear a beep sound
multimeter red & black probes
when you place it here and that's the probes together you will hear a beep sound now the beep sound is very distinct here but let us try and understand what is the reason behind this beep sound
Q: why do we use this continuity test now the reason why we do this beep testing?
A: when we are checking a wire and we want to check whether the wire is broken in between typically broken wires are called open wires so if you want to check whether the wire is broken from inside now you will not be able to find it out looking at it from the outside so in order to check the continuity we use the beep or continuity testing

which means you touch the two ends of the probe using the two ends of the wire using the black and red probe and if you hear a beep sound which means that the circuit is not open the wire is proper but if you don't hear a beep that means that the circuit is broken somewhere and you need to fix it
this is also used while doing tracing on a cell phone printed circuit board to check whether two points are connected properly

How Do You Test and Trace Prints on a Cell Phone PCB

how to test or trace a Prints on a cell phone circuit system using multimeter
testing power supply in prints
Now we will try and understand how we can test or trace a Prints on a cell phone PCB circuit system testing or tracing in a PCBs essentially is to find out whether the power supply is properly reaching different parts or components of a cell phone and as you all know we will be using the digital multimeter to try and test this whole process so once we switch on the multimeter we place it in the beep or continuity testing position and we will touch the probes to check it up if we here the beep which means the continuity testing position is working perfectly and the probes are in proper condition using these probes we will be able to test the circuitry in a cell phone PCB

The Ground Line in Cell Phone PCB (GND)

so, first of all, we will check the negative line in a cell phone PCB as you all know a power comes with a positive and a negative line, a negative line is what is also called a ground line or the baseline and this is signified by the yellow strip that you see all across the phone PCB
the negative line in a cell phone PCB also called a ground baseline signified by the yellow strip that you see all across the phone circuit
GND in mobile circuit
so this entire yellow strip that you see in the picture right now brightly colored strip is what signifies the negative line on the cell phone

How to Measure Ground Resistance with a Digital Multimeter

How much resistance should a ground wire have to Measure Ground Resistance
testing ground resistance with multimeter
in order to test this negative line, you can place the probes tips in the multiple points across this entire circuit and check whether the continuity is intactor not so let's try and first check the probes and try and start off with the tracing of the negative line in all Phone PCB so every board typically will have a very prominent line like this the negative line or the grounding line as we call it in order to test if you place the probe on any 2 on the grounding line and you can hear the beep so when we do this testing you'll be able to check whether the circuit is broken at any point in time if it's a closed circuit which means it's perfectly all right all the points are connected very well and the negative line is intact if it's an open circuit you will not hear a beep sound when you place the probe at the respective point.

so as you can see in this deep article on Top Multifunctional Digital Multimeter we tried understanding what a digital multimeter is how the probes work where the probes need to be placed how we can measure AC current and DC voltage, live wire testing and continuity testing check Ground accurately on cell phone circuit board going forward we will collect a lot more information about how we use this tool in different streams including iPhone repairing electronics thank you very much for reading

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