Samsung Galaxy A13 5G(A137) Not Charging

Samsung Galaxy A13 5G(A137) Not Charging
Device	Galaxy A13 5G
Affects part(s)	Logic Board
Needs equipment	Soldering Iron, Hot Air Station, Microscope
Difficulty	◉◉◉◉ Specialist
Type	Soldering, BGA

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Problem description

You have a phone that does not charge but it works with charged battery. It could have happened due to faulty charger/short on cable or something similar.

Symptoms

• Phone does not charge at all
• No charging logo on top(near battery)
• Does not connect to PC
• Burned charging port
• Customer said happened with bad charger/usb cable

Diagnostic Steps

This is how to diagnose and repair the no charging fault:

• Check if these diode values on fpc are ok.

Required for Charging

• ALL OF THE VOLTAGE CHECKINGS BELOW SHOULD BE DONE ONLY BY INSERTING A CHARGER AND NOT A BATTERY. IF YOU WANT TO CHECK GR SHOULD BE WITHOUT ANY SOURCE OF POWER(CHARGER OR BATTERY)

ic's to check

IC's and Diode value

• Check for 5v input in the VBUS IN capacitor:
  • if ok then check check on VBUS IF FL(bypassable coil):
    • If voltage is ok then skip the next step
• If no voltage in VBUS IF FL then you most likely have a fused OverVoltage Pritection ic. There are 2 ways to fix it.
  1. Change the OVP IC with a similar one.
  2. You can bypass it but by bypassing it you will have higher risk to damage a chaging ic in future because of faulty chargers/cables.
     • Bypass the OVP IC: remove the OVP IC and make the same exact jumper(short VBUS IN to VBUS IF) shown in the picture below

     • 

       removed ovp ic

Bypassed OVP IC

• Check for Voltage on VPH COIL(3.7-4.2v) Should have stable voltage and no fluctuation.
  • If voltage is not stable then check GR of VPH COIL, if okay then the problem could be the charging ic(replace charging ic)
• Check for GR and voltage on BOOTCAP
  • Should have 3.7-4.2v in one side and the other side should have almost the double voltage of it
  • if it doesn't then you could have a faulty bootcap or faulty charging ic.
  • Check for faulty BOOTCAP: probe both sides of bootcap and check for short, if does not show low gr then its considred ok.
  • Note: If you have a faulty bootcap then the problem you will most likely face is fake charging.
  • Your problem should be solved by replacing charging ic.