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How To Check Short Circuit in Mobile Phone

18 Jan 2014
All Phone Short finding method is same.you can use Digital, Analog Multimeter, and Digital Power Supply both to find the shortage in smartphone motherboards.
You also can use a DC Digital power supply for testing Shortage but this is better to find where or which part of the smartphone is really short. This way is not a good way to identify a shortage because DC Power supply can't detect very small shorts in the motherboard which cause some faults on Phones. So remember the best method is using a Digital or Analog Multimeter.

How to Check Shorting in Mobile with Multimeter?

How to find short circuit in mobile phone it is a very easy and quick method to find if there any shortage on a Phone is using both Multimeter.
  1. Analog Multimeter
  2. Digital Multimeter
Now final, how to check short circuit with multimeter in mobile

Analog Multimeter
  1. Put multimeter to x1 buzzer or x10
  2. Check Battery Connector two pins
  3. simply put (+) test meter probe on GND pin and (-) test meter probe on +Vbat Pin
  4. if the Analog multimeter pointer moves even a little there or buzzer is short
How to test mobile short circuit with analog multimeter
half shorting
this is, how to check half shorting in mobile with multimeter

Digital Multimeter
  1. Set multi-meter on CONTINUITY
  2. Scenior1: Connect Black probe to Circuit's +VE print.  and Red probe to Circuit's -VE print shows some reading.
  3. Scenior2: Connect Black probe to Circuit's -VE print and Red probe to Circuit's +VE print shows no reading.
Note: IF reading shows in BOTH scenarios it means circuit has Shortage.
Now you have a question? how to use a multimeter to test a smartphone motherboard.
Answer: you can apply the same method on smartphones, as I told you in the starting of this blog post. now move on to check shot on circuit board of phone we are testing phone PCB with power supply

how to use multimeter for mobile repairing read my blog post Digital Multimeter Step by Step Guide

How to Find Half Shorting in Mobile using Digital DC Power Supply

  1. Put power to your Smartphone using DC Power Supply(As your Phone's DC power needs) Normally 3.8 volts is enough and in tablets, 4 volts some Chinese mobiles needs 4.2 volts 
  2. Connect Power Supply Red clip to Battery Connector +Vbat pin 
  3. And connect Black clip to both Battery Connector BSI and GND Do not touch any volume or power button
  4. If your Digital or Analog Power supply's Ampare Reading Scale shows any of current amount that’s mean there is a shortage in it.
Digital Power supply shows Ampere Reading that’s mean there is a shortage in the phone
DC Power supply Ampere Reading half shortage phone
5. Mobile Short Solution: if your Power supply Shows “0.00” on Ampare Reading Scale it means there is No any shortage in motherboard
if you don't know how to operate a dc power supply read my blog post how to use DC Power Supply

Is it Possible to Repair Phone after a Short Circuit?

Yes is it possible to repair phone after a short circuit! now listening to this you want to know how to repair short mobile phones. if your smartphone is short, it can have various issues like it may not turn on (dead), it may overheat (although it is normal in some smartphone models!), its battery may drain and discharge very fast, it may hang or auto restart and freeze frequently, it may auto turn off sometimes, etc. It is called short-circuit smartphone motherboard. Before removing shortage you should know whether your smartphone motherboard is short or not.

Reasons for shorting in smartphone motherboard

  1. If the smartphone gets dropped on the floor or on some hard surface.or the phone gets wet or is dropped in rain or swimming pool water.
  2. phone overheating.
  3. Trying to use the faulty charger for charging in the smartphone.
  4. Electric Sparks or smoke coming out of the Phone due to any reason form Handset charging port.
  5. To repair a short smartphone, you will have to first remove its shortage to repair it. You have to follow the procedure to remove it, especially in dead Smartphones.

how to remove shorting in mobile phone and smartphones

1. disassemble your Smartphone and get out the shorted phone printed circuit board (PCB). Be careful, so that you do not damage it! I suggest you watch the disassembling video on youtube first then remove LCD, camera, etc because we just need the motherboard, not whole phone short circuit no disassemble.

2. Clean the entire motherboard thoroughly with any circuit cleaner like Philips contact cleaner spray, alcohol, thinner etc. Now dry it completely. After each cleaning step, you have to check if the shortage is not gone proceed to the next step.

3. Now try to deep clean the Phone Circuit Board. There is a liquid called Elma used by smartphone repair technicians in the Eastern Europe countries named Elma.
Elma liquid cleaner can deep clean the Phone Circuit Board
smartphone repair technicians use Elma

Elma procedure: Dip the Circuit Board in Elma for 1 to 2 hours. Remove the Circuit Board and clean it thoroughly with a toothbrush. Dry the Circuit Board completely with cotton or ultrasonic cleaner machine,
ultrasonic cleaner machine for Cleaning mobile phone circuit and its basic electronics
ultrasonic cleaner machine
not even a droplet of water remains. For drying, you can use direct sunlight or 100-watt yellow bulb.
and now in the end of this blog post, this video shows you how to find short circuit in mobile phone components.

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