How To Use DC Power Supply

How To Use DC Power Supply in Mobile Repairing, A Complete Step by Step Guide with Free PDF. Read the full post to learn the tips and tricks to repair mobile phones and smartphones.
Question: do cell phones use AC or DC current
Answer: cell phones use DC current only

Hi, today I'd like to answer a very common question I get from beginner mobile device technicians in my mobile phone repair class which is, how do I use a DC power supply to power a cell phone? why would I want to use a DC power supply to check and find the faults in feature phones and smartphones? well this information year 2024 is written to teach you how to use a DC power supply and stay tuned

Let's start with why there are two answers for the Y the first answer to why I would use a DC power supply mobile repairing to power where the cell phones are is that this R.s 300 mini power supply

Cheap converter dc to dc Adjustable Step Down Module power supply
mini nonadjustable

That you would buy on mobile malls here in Asia it's pretty flimsy they died fairly often and especially if you're doing what we do which is plugging them into liquid damaged mobile devices or Android and Mac devices that have short circuits you're bound to go through a lot of these and it gets tiring after a while to continuously spend R.s 300 on something that breaks.

DC Power Supply guide for mobile phones repairing
fault tracing principles

Read mobile hardware maintenance is a great article for beginners and experts in mobile cell phone repairing

Don’t have time to read the whole blog post right now? Get A Free PDF Copy Of This DC Power Supply Page: Get Updated information on DC Power Supply 2023. if you want to Go Further in Hot testing this PDF Document on how to use DC power supply for mobile repairing pdf will help you a lot!

How To Use DC Power Supply in Mobile Repairing A Complete Step by Step Guide with free PDF
how to use dc power supply for cell phone repair

No worries. Click Here so you can download a PDF copy of DC Power Supply Digital For Mobile Phone Checking so you can read it when it’s convenient for you

This video on DC Power Supply how to use helps you get power supply repair guide pdf, DC machines problems and solutions pdf, and power supply problems and solutions pdf so watch it until the end

The second the why is that by using a DC power supply I can intuitively tell exactly how much power the smartphone is using so for example:

find principles here to test smartphones with digital power supply
cable connecting examples

I've hooked up a DC power supply connector to this smartphone that I have down here and as you can see at 3.8 volts I can see that this phone is pulling 200 amps and as you can see in a picture 
Ampere on working cell phone repairing examples theoretical and practical limits of dynamic voltage scaling
practical knowledge

the amount of Amperes a phone is using can very often be a link to the type of problem it's having the same way that a doctor is going to tell if you have a niche over here you may have this illness if you have this temperature with your fever you may have this illness that's the same thing here oh if this IC integrated circuit is bad if the phone may be drawing this many amps if that integrated circuit is bad the device may be drawing that many amps it's a way to kind of try and narrow down what's wrong once I realize that there's a pattern every time this IC is blown the phone is drawing this many amps I don't have to go through and repeat that same troubleshooting process every single time I can just go huh the last five times it was drawing 58 amps IC a was corroded so when I see it's drawing 58 a mess rather than spend 30 minutes troubleshooting I can check integrated circuit a within the first minute and bam I have a solution to my customer phone problem. if you have a Digital DC Power Supply already that's good or if not! visit this link to Review Best Top DC Power Supply and find one that suits for your price range
variable dc power supply kit
Digital DC power supply

If you are a new mobile technician and don't know what is this digital DC power supply? first, read this article on Wikipedia for a better understanding of AC-to-DC supply. 

A regulated DC power supply is converted unregulated AC Alternating Current into a constant DC stable voltage
DC power supply description

if you are an electronics student and reading this information to know more about the basics of DC power supplies, PSU, detailing linear and switching types and their advantages and disadvantages read this article also

How To Repair DC Power Supply

This video teaches you how to check repair dc power supply internal parts

This battery eliminator for battery repair latest article updated you before the year 2023 in the field of mobile phone repair

Want to seek the following word's information?
  • mobile dc machine
  • phone power supply
  • DC power supply equipment
  • DC machine mobile repair
  • dc machine mobile
then you are on the right post

How to use dc power supply machine

For Checking a mobile battery and boosting it with dc supply power place the dc supply machine for mobile on 0 voltage and 0 amperes. then slowly increase the voltage untell unless ampere reading starts showing a reading. when the battery gets boosted ampere reading show switching on the mobile repair DC power supply.

Note: if ampere reading does not increase then the battery is faulty 

This is the mobile repairing tips and tricks for Checking a battery and boosting using power supply machine

How to check dead mobile with dc power supply

For Checking dead mobile with dc machine for mobile repairing place the dc machine on 4.1volt. you can see the mobile volt on mobile battery before setting it on dc power supply machine for mobile. now press power button on your phone. if the Ampere reading on the mobile repairing power supply shows some value it means your phone primary and secondary lines are ok.

Click here to watch the video on how to revive a dead phone with dc power supply

Note: If the Ampere does not show any reading it means phone primary and secondary power supply is leaking.

Learn 6 port USB charging station is a valuable tool in mobile repair. Understanding its use and being able to decode its readings can help solve common phone problems quickly.

Now the next question is going to be how do I connect this how do I connect a smartphone to a variable DC power supply?

so here we have the smartphone so on this end this is a plus and minus wires we need to plug into the smartphone. so you're gonna have a black wire which is going to be ground so this here is your red wire this is your positive of your DC power supply

The intended use of these plugs is on the cable connected to a power supply
dc power supply crocodile cable

as you can see in the picture I've already got two wired up here so to be compatible with all the different Android devices I would suggest you get set up your DC power supply voltage on 4.1 to 4.2 volt and 200 Ampere because Android phone or android tablet device often is not going to turn on if you do not plug them into a 4.1 DC Volt on your switching power supply.

Suitable for multimeter, power supply and other electronic equipment
connecting cables to phone

so that is how you would use a DC power supply to power a smartphone you just plug it into these two wires to the Digital DC power supply it has functionality that allows you to watch your customer's phone Ampere and voltage readings 

Here are some examples of voltage and Ampere on working phone repairing
voltage and ampere readings

now you can also use this method here to power up a feature phone so you have to buy these little cables

dc power supply cable multi connector
Mobile Phone Current Test Cable with USB Output

these cables allow you to plug feature phones into the best dc power supply for mobile repairing with their battery connectors so this is a nice little cable over here it's nicely sleeved it reports proper temperature information supposedly you never know stuff from China and I can show you what that looks like in this picture

Mobile phone repair tool DC Power Supply Cable with USB Output to Test voltage and ampere
measure USB current with dc power supply

see over here it's got connectors that will attach to the battery connector of a feature phone as you can Watch the Phone Checking Wire Placement Demonstration GIF here.

How to connect Testing Cables to DC Power Supply
Wire to read Mobile Phone circuit

you can power the feature phone using a DC power supply with those cables you would just take them and you plug the red end into the red part of your DC power supply the black end ins the black part of your DC power supply connector you would set the voltage to the feature phone battery voltage around three point seven three-point eight volts and then you would plug this end into the battery connector on the feature phone and then you would be able to power the old mobile phones using the DC power supply rather than having and go around your shop and try to find your customer old mobile phone battery that you know works and you'd also be able to see the amount of amperage that it's drawing directly on the digital power supply for mobile phone repair which is pretty cool obviously try to avoid making the mistake of plugging in your feature Phone using smartphone phone voltage won't exactly be a happy feature phone Set DC power supply voltage on 3.7 and Ampere on 150 to check feature phone.

How to Connect Android and iPhone with DC Power Supply

Mechanic iSupply Mini DC Power host with different phones cable
DC Power Supply Dedicated Cable 

To connect iPhone and new smartphones from their battery connecter you need a DC power cable for iPhone and Android. these cables are also good for someone who just needs a battery connection other than a complete test power supply. DC Power Supply Cable for almost all Android phones and iPhone models with different phones Mini battery connectors cable used to switch on new smartphones. it is used to test new smartphone's voltage and Ampera with DC Power Supply. Buy Multipurpose DC Power Supply Cable here

how to use multimeter in mobile phone repairing
how to use digital multimeter for mobile repairing pdf

Learn how to use multimeter in mobile phone repairing to measure AC volts, DC volts,  Ohms, Resistance, and Continuity Beep Testing

DC Power Supply for Mobile Repairing Price

in this article, I am also sharing information with you about the best DC power supplies rate because the reader also went to know where to buy their mobile DC power supply machine.
the website is listed below

the reason I bring this up is that I would say a good 99% of the people reading this post went to know the DC power supply for mobile phone repairing price before buying the best DC power supply remember, if you're just gonna want to go for the cheaper power supply don't go for something that's way too cheap because those are gonna send ripple currents and voltages and do all sorts of nasty stuff now you can also use this. 

if you are interested in reading a PDF Book on regulated DC power supply click here

how to use an analog multimeter
analog and digital multimeter pdf

Learn how to use an analog multimeter and analog multimeter working principle in mobile phone repairing

How to Use DC Power Supply for Cell Phone Repair

you can also use a DC power supply to supply DC (Direct Current) to a mobile phone PCB Printed Circuit Board. most mobile repair technicians use a DC power supply to switch ON a smartphone without their batteries. The supply can be used to substitute for the Cell Phone GND, +VBAT Battery Voltage when doing hot testing on the Mobile PCB. This is being used to trace the +VBAT, VCC main line in Mobile Phone PCB. the Supply provides high stability output voltage and its constant ampere can auto-conversion. you can use power supply in many different areas of the mobile phone PCB for hot testing.

To learn hot testing on mobile phone circuits follow these steps:

step one: adjust the power supply on 3.8volt then connect its wires to mobile battery connectors

step two: Turn on the mobile phone

step three: now place multimeter black probe on mobile phone PCB Ground and place the red probe on the print of VBB to check the DC voltage on phone circuit.

adjust dc power supply on four volts then connect its wires to mobile circuit
black on Ground and on VBB

To know the testing principle for mobile phone repairing read Digital Multimeter step by step guide

How to use DC Power Supply in Mobile Repairing?

You can use DC power supply mobile repairing to check four things in your customer's phone
  1. customer's phone is dead or not
  2. customer phone circuit is a short circuit or not
  3. customer phone circuit prints are open or not
  4. customer's phone has a software problem
Phone technicians need to understand the voltage and current requirements of 4g smartphones. My new blog post can help you apply voltage and ampere settings on JDI Power Supply. If you are involved in mobile phone repairs, it is crucial to understand 4g Smartphone Diagnostics.
1. Customer Phone is Dead or Not

how to connect mobile phone with DC Power Supply
connecting examples

Watch how to connect mobile phone with DC Power Supply GIF Demonstration here.

Set DC power supply Voltage to 3.7 and Ampere to 150 to check the feature phone.

Set DC power supply Voltage to 4.1 and Ampere to 200 to check smartphone.

If you are connecting the Tablet then set the switch supply Voltage to 4.2 and Ampere to 200.

Now switch ON the phone and see Ampere Reading. 

how to read Ampere Reading on DC Power Supply
DC Power Supply feature phone Ampere

Watch how to read Ampere Reading on DC Power Supply Demonstration here.

Note: If the Ampere does not show any reading it means your phone power input track on the battery connector is open.

2. Customer Phone Circuit is a Short Circuit or Not 

Reasons for short circuits in mobile phone circuits:

1, Phone falling into toilet water or liquid damage. this is the most common reason that mobile phone users are facing in routine life.

2, The smartphone is warming again and again.

3, Using an incompatible or faulty phone charger for charging the battery. also when you use the wrong charger to charge your phone it gets hot.

4, Sometimes due to any reason phone has fallen down or crashed.

To check the mobile phone short circuit with the dc power supply follow the steps below: 

step one: Set DC power supply output voltage to 3.7v or 4.1 volts.

step two: Connect the red wire to the positive terminal of the battery connector (+VBAT pin) and the black wire to the negative terminal (GND)as well as the 3rd pin called the BSI battery status interface.

DC Power Supply Reading

Reading one: Now, if you see any amount of ampere on the screen, without you pressing the phone power button then it means, the mobile phone is a short circuit.

half shorting reading look like this on the digital power supply
half short circuit

Watch half shorting reading Demonstration here on DC power supply.

Half Short Circuit

Reading twoAnd if there is the screen shows ‘0.38’ to ‘0.58’ in the ampere reading, then it is Half a short circuit.

Full Short Circuit

Reading threeif you see on the screen shows ‘0.00’ in the voltage and ampere reading, then the mobile phone circuit is the full short circuit

3. Customer Phone Circuit Prints Open or Not

To understand mobile phone short circuit better in your customer's smartphone you have to know 2 terms of electronics:

Phone Circuit Print is Open: if a mobile phone print is broken, then it is said that the Print is open.

mobile phone circuit is open due to short circuit on between prints
cell phone circuit track is open

Phone Circuit Prints are Short Circuit: if 2 parallel separate Prints positive and negative touch each other due to a fault in the mobile phone PCB, it is called a short circuit.

mobile phone circuit tracks are short circuit due to fallen damage
component goes short

Note: In PCB boards of mobile phones, smartphones, and tablets there is the print instead of copper wires through which DC current flows. Hence we use the term ‘Prints’ instead of copper wires or cables.

Now let me tell you the Problems of the short circuit in smartphones:

1, When you switch ON the phone, it goes switch OFF automatically after a few minutes.
2, The phone goes completely dead.
3, Phone battery drains and discharges fast.
4, The phone goes hot and the get Hang.

Note: The above procedure to check short circuit in the mobile phone with DC Power Supply is the same for all Mobile brands and tablets including Microsoft phones, Samsung, Nokia, Apple iPhones, Sony Xperia, HTC, Motorola, Q mobile Vivo, and Oppo handsets. It will be the same for all iOS, Android, or Windows OS smartphones.

4. Customer Phone has a Software Problem 

Set DC power supply output voltage to 3.7 volts on the feature phone and 4.1 volts on the smartphone. 

Connect red wire of the DC power supply connector cable to the positive terminal of the battery connector, and black wire to the negative terminal and the yellow probe to the middle pin of the battery connector of the feature phone. 

In the smartphone connect the power supply cable red wire to the positive terminal of the handset battery connector +VBAT and the black wire to the negative GND as well as the 3rd pin BSI to check the phone.

Now switch ON the phone and see Ampere reading. if you see 003 or 005 amperes on the screen, when you press the phone power button then it means, the feature phone software is corrupt.

In the smartphone, you see at ampere reading screen 010 or 015 when you press the power button of the phone if the phone is in software fault.

Ampere Reading Shows 010 or 014 in software fault
Ampere Reading Examples

Watch how to read phone software problem Reading on DC Power Supply Gif Demonstration here.

Remember, in many cases software faults in a smartphone. the smartphone switch is on but the screen shows a startup logo and digital DC power supply reading switch between 010 to 020 ampere

These are the examples of readings of digital DC Power Supply for repairing mobile phones faults. so that is it for today's post that is how you can use a DC power supply to power a smartphone and feature phone both to put the voltage and Ampere on your DC power supply screen and free information that's why I do it and as always I hope did you learn something

At the end of this Blog Post some useful pages to learn mobile repairing online:

31 Free PDF Ebook Online Library to learn mobile phone repair in the year 2023

Do you want to know which same parts are there in all Smartphones? If yes, go through this entire GIF video Tutorial to know all the information you need to read Visual Guide Inside of Smartphones1. Improve the clarity of the writing by organizing the content into smaller sections with clear headings and subheadings. This will make it easier for readers to navigate the information and find what they are looking for.

2. Provide more specific examples and practical tips for using a DC power supply in mobile phone repair. This will help readers to better understand the process and apply it effectively in their own work.

3. Incorporate more visuals, such as diagrams and images, to illustrate the concepts being discussed. This will make the content more engaging and easier to understand, especially for readers who are visual learners.


please dont add any spam comment

  1. please give a chart / list /table what may be the problem according to the ampeare value showed in dc supply

  2. Please make youtube video in english too


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