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Learn to Repair Smartphone Printed Circuit Board Step by Step part two

6 Jan 2018
As I told you in my previous article the PCB printed circuit board cannot be repaired in two situations
  1. when it burns
  2. and second When It Breaks

when it breaks the copper wire gets disturbed otherwise,
printed circuit board
copper wire inside

in the burn case,
mobile circuit

we see that how much it burns if it burns too much then you cannot repair it.and if it burns just little more then you will try to fix it.

Q: How Can It Be Fixed?

A: we will know it by using the meter!
digital meters

you will have to keep the multimeter on continuity if the phone is short it will give reading from both sides on the battery connector of the phone.
multi meter leads
battery connector of the phone

and if the phone is not short that you will not get reading on multimeter form the battery connector on the phone.as I told you the meter should be in continuity and if you are using the digital meter then put it on continuity buzzer.
meter position
digital meter continuity buzzer

placed the black lead from the meter on the positive side of battery connector and red lead on the negative side if reading shows
mobile short reading
same reading both side

by the opposite banking then it means there is a shortage in the circuit remember one thing! all the reading shows the amount of burning area in the circuit for example if the opposite shows
opposite side reading
previous reading

it means the phone is 35% short or burn Similarly if opposite shows more than

it means the phone has been burn more than the previous reading if reading is zero from battery connector both sides then phone circuit cannot be repaired ever.

I tell you the method to repair any mobile phone PCB step by step to know what is smartphone circuit board prints you must visit my previous article

Mobile Phone Hardware Repairing ( about faults comes with IC ) part two

LCD Light Control IC
LCD Light Control IC
ic position

LCD Light control IC Power Amp This is a very important IC for Transmitting signal (Tx) in your phone. This IC is work as a Tx amplifier and it gets high voltage directly from the battery.When it is damaged we can see following faults.

Signal Drop

No Network or Access

Battery low quickly

Cant make a call ( Tx does not work properly )

Power on failure

I published an article about faults comes with phone ICs if you don't read it click here

Find and Download free mobile phone circuit diagram pdf Online

iPhone, Blackberry, Htc, Samsung, Nokia, Sony Xperia, Motorola, LG, China, Qmobile, Huawei

Learn how to read it. At first, you might think that it is hard to do so, You are not going to be experts and master in smartphone repair as long as you don't know how to read it. Many of mobile phone repairman exist nowadays that do not have any knowledge about reading it. They always rely on finding free solutions over the internet and forums. Those people who give free solutions are those people who know how to read a schematic diagram. Now here's your chance to learn and do not rely on others, and be an expert and master troubleshooter when it comes to hardware problems.

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