Samsung Galaxy A13 5G(A137) Not Charging: Difference between revisions

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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Latest revision as of 19:23, 24 August 2025

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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.

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)

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

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.

@@ Line 1: / Line 1: @@
 {{Repair Guide
-|Device=Galaxy A53 5G
+|Device=Galaxy A13 5G
 |Affects parts=Logic Board
 |Needs equipment=Soldering Iron, Hot Air Station, Microscope
@@ Line 11: / Line 11: @@
 Provide a concise description of the issue here. Be  as specific as possible to help readers quickly determine whether or not this is the exact problem they are facing.
   -->
-You have tried to replace the main FPC connector and display and the problem persists then this would be your issue.
+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.
-The device has no touch after a little time of use OR no Touch at all.
-The Device turns on normally but doesn't display anything.
-Mainly this issue occurs after a heavy drop or if a customer drops his phone a lot.
 == Symptoms ==
@@ Line 23: / Line 17: @@
 Detail all measurable or observable symptoms in this section.
 -->
-* This issue happened after a drop
+* Phone does not charge at all
-* You will experience no touch or no display or both at the same time but the phone is working and charging fine.
+* No charging logo on top(near battery)
+* Does not connect to PC
-== Solution ==
+* Burned charging port
-<!--
+* Customer said happened with bad charger/usb cable
-If the issue has a single, specific solution, provide it in this section and delete the sub-headers below. Otherwise, if there are multiple potential causes for the problem, outline the process of identifying the root cause and offer corresponding solutions below.
--->
-[[File:2025 05 13 15 19 IMG 77781-Recovered.png|thumb|175x175px|check diode values on these pads]]
 === Diagnostic Steps ===
+This is how to diagnose and repair the no charging fault:
-* Mainly this issue occures after a heavy drop
+* Check if these diode values on fpc are ok.
-* Check diode readings on the following lines, if you have OL or high diode values at these pins then you should follow this guide. <br />
-=== Repair Steps ===
-Warning: Attempting this repair without enough experience with microsoldering, may lead to a dead/ no dispay issue. Proceed with caution.
-'''Start Removing the shield and trace the damage'''
-[[File:2025 05 13 11 44 IMG 7766.png|thumb|149x149px|find the  problem]]
-# Start by removing or grinding the front baseband section and CPU shields.
-# After you have carefully removed the shields try to trace the area where the problem has occured. (as shown in the picture)
-'''Start the repair process'''
-[[File:2025 05 13 12 27 IMG 7768.png|thumb|163x163px|prep the damaged area]]
-# Start by removing the first layer of the motherboard(that is ground) on the area where your issue is located, it would be near the marked area. (to remove the 1st layer you can use a surgical blade #11 and be patient)
-# After you have successfully removed the 1st layer you can try to find the second layer and in that layer you will find the problem that is caused by a hard drop. (you will finds something like this picture)
+[[File:DP DM on conn.png|center|thumb|Required for Charging]]
-'''Soldering process'''
+* 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)
-[[File:2025 05 13 14 14 IMG 7769.png|thumb|165x165px|fixed damaged area]]
-* I personally use a little bit of no halogen flux for this repair and use 183 C paste
+[[File:Ic's to check.png|center|thumb|ic's to check]]
-* prep the pads that are broken white tin and start jumpering the broken traces, I preffer to use 0.007mm silver jumper wire for these kind of works.
+[[File:IC and Diode value.png|center|thumb|IC's and Diode value]]
-* After you have made the traces with jumper wire try to turn on the device and see if touch works properly and you have a display.
-* If everything seems fine then now you are ready to apply a UV Solder Mask to finish the repair. (the end result should look like the picture.)
+* 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.
+*# Change the OVP IC with a similar one.
+*# 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
+*#* [[File:Removed ovp ic.jpg|center|thumb|removed ovp ic]]
-'''More details about the pads'''
+[[File:Bypassed OVP IC.jpg|center|thumb|Bypassed OVP IC]]
-[[File:Touch and display pads.png|thumb|219x219px|pads info on the back]]
-* here is some more information about these pads from where the actually go and where the lead.
-*
-[[File:2025 05 13 15 19 IMG 7778.png|thumb|212x212px|pads info on the fpc]]
+* Check for Voltage on VPH COIL(3.7-4.2v) Should have stable voltage and no fluctuation.
-enjoy, your repair has been successful.is completed.
+** 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.
+** '''<u>Note:</u>''' 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.<br />