LG G3 D855 no power

[Jovanarmando]

Client dropped their G3 and now it will not power on and no usb activity. No led light either. Any suggestions?

[spagman]

Did the customer tell you what happened to his phone?

Did they flash?
Did it fall?
Etc.

These are useful questions that will help a lot with repair

[Jovanarmando]

No flash, the customer said she was taking it out of her pocket and it fell to the ground. After that no power and no activity when charging cable is inserted. I am assuming that a power IC may be loose but I don't know where on the mainboard to start testing.

[spagman]

Look for missing parts under microscope...
Cracked motherboard.....

Try to reheat IC chips... Test the LCD etc.

[spagman]

This can be a hard fix because it can be anything on the motherboard

[Jovanarmando]

Yea sigh, thank you guys. I'll start troubleshooting

[Jovanarmando]

Can someone show me which IC is the power IC?

[efrcom]

Originally Posted by Jovanarmando

Can someone show me which IC is the power IC?

LG D855
power IC U4100+U4200

[debeliamark]

Originally Posted by efrcom

LG D855
power IC U4100+U4200

Dear Efrcom, do you see this effect - LG G3 Blue screen few seconds after power on - even can be flashed and no blue screen until flash process going on. Checked with new LCD - same, restored FW - it's without errors:
Example:

Welcome to Octoplus/Octopus Box LG Software version 2.2.7
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG Qualcomm
Selected port: COM1
Selected model: D855
Reading info...
Could not detect mode!
Performed by 2.2.7 software version.
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG Qualcomm
Selected port: COM273
Selected model: D855
Reading info...
Model ID: LG-D855
IMEI: 354153-06-202069-7
Android version: 5.0
Battery level: 69%
Mode: Emergency
Initializing flash...OK
SW version: LGD855AT-00-V20h-EUR-XX-JAN-19-2015-16G+0
LAF Version: 1.0
Product ID: BS02S140612000188
IMEI: 354153-06-202069-7
Target operator: GLOBAL
Hardware: rev_10
Opening "D85520i_00_16GB.oct"...OK
Setting options...OK
Reading partition...OK
Formating USERDATA...OK
Writing PrimaryGPT...OK
Writing modem...OK
Writing sbl1...OK
Writing dbi...OK
Writing aboot...OK
Writing rpm...OK
Writing tz...OK
Writing boot...OK
Writing persist...OK
Writing recovery...OK
Writing laf...OK
Writing factory...OK
Writing system...OK
Writing cust...OK
Writing BackupGPT...OK
Reading partition...OK
Formating RCT...OK
Formating MPT...OK
Finalizing...OK
Writing firmware done!
Performed by 2.2.7 software version.

But ... power on = LG logo and Blue screen ( of death ) after this.

Consumption on external power source seem is OK. Charging goind well on powered off unit ( just battery with percentage on screen when short press pwr button ).

Any advice is welcome.

WBR, DebeliaMark, BG

[efrcom]

A.software
1.missing files
2.wrong (incompatible) version

B.hardware
1.LCD
2.lcd connect
3.lcd parts and ic(power ic,cpu,...........)

[debeliamark]

Originally Posted by efrcom

A.software
1.missing files
2.wrong (incompatible) version

B.hardware
1.LCD
2.lcd connect
3.lcd parts and ic(power ic,cpu,...........)

It have SW inside... by the way i was make "boot repair" procedure, forcing it via testpoint to HS-Qualcomm 9008 mode and rewrite partition by partition. Also can be connected in "Emergency download mode" and flashed by known ways ( you see the log about ). In fact when flashing process moves, then the picture on the screen is like usual ( with info about progress ) - there no blue screen till restart after process done.

By the way - i was checked LCD itself with brand new and original one - same situation - blue screen after logo.

No any visual damages over PCB ( under scope ), but ...

I think there is something no working due to phone systems initialise - in fact in download mode just the AP part is working ( together with PMIC and LCD ), but no Wi-Fi, BT, ect ...

Taking a first look over summary is:
working - Charging ( phone off, just charge - all is like on working G3, exactly ), AP ( can be rewrited, phone important data is inside ( IMEI, SW version, ect ... ) - i see flashing process come from begining to end like usual from emergency download mode, sw version can be changed up / down ( i was checked V20i and V20h, due to earliler versions 10 are eMMC size depended ) - there latest are V30b and V30c, but i just want to not go away from initial SW release, that was inside before strange behavior. And finaly - LCD ... it work like new one, nothing in this case is from LCD, even on first look damage is on LCD.

OK - will continue to investigate, so - will keep comunity informed.

P.S. There a indicates that this "Blue screen" problem is only for phones from 2014. Something like https://www.youtube.com/watch?v=QTP6kOuBrEU

[harhar01]

Originally Posted by debeliamark

It have SW inside... by the way i was make "boot repair" procedure, forcing it via testpoint to HS-Qualcomm 9008 mode and rewrite partition by partition. Also can be connected in "Emergency download mode" and flashed by known ways ( you see the log about ). In fact when flashing process moves, then the picture on the screen is like usual ( with info about progress ) - there no blue screen till restart after process done.

By the way - i was checked LCD itself with brand new and original one - same situation - blue screen after logo.

No any visual damages over PCB ( under scope ), but ...

I think there is something no working due to phone systems initialise - in fact in download mode just the AP part is working ( together with PMIC and LCD ), but no Wi-Fi, BT, ect ...

Taking a first look over summary is:
working - Charging ( phone off, just charge - all is like on working G3, exactly ), AP ( can be rewrited, phone important data is inside ( IMEI, SW version, ect ... ) - i see flashing process come from begining to end like usual from emergency download mode, sw version can be changed up / down ( i was checked V20i and V20h, due to earliler versions 10 are eMMC size depended ) - there latest are V30b and V30c, but i just want to not go away from initial SW release, that was inside before strange behavior. And finaly - LCD ... it work like new one, nothing in this case is from LCD, even on first look damage is on LCD.

OK - will continue to investigate, so - will keep comunity informed.

P.S. There a indicates that this "Blue screen" problem is only for phones from 2014. Something like https://www.youtube.com/watch?v=QTP6kOuBrEU

From my experience blue screen its big PM ic (PM8974)

[debeliamark]

Originally Posted by harhar01

From my experience blue screen its big PM ic (PM8974)

Strange, but not ... not the PMIC was the problem ... anyway - i was resolved it ...

[Jovanarmando]

Originally Posted by debeliamark

Strange, but not ... not the PMIC was the problem ... anyway - i was resolved it ...

Cool, what was the issue?

[A2Z MOBILES]

hello sir how are you ??????