No backlight after light water- all else seems to work

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Samsung Galaxy Note II

The Samsung Galaxy Note II is a smartphone noted for its combination of a large display and software optimized for an integral self-storing stylus.

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Tom Retson @stilllearnn

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Gönderildi: 25 Tem 2013

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No backlight after light water- all else seems to work

Only briefly wet in fresh water, dried in rice for days and now appears to have everything working (including touch functions) but screen stays black. I disassembled and cleaned all contacts. Saw no corrosion. I can answer calls by swiping screen and can access all files via USB to computer link. Incoming Email and text notification alarms continue. Battery will recharge. Anything else to try other than new digitizer?

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Thanks for quick and helpful reply. Much appreciated. Angled light does not reveal any outlines. I did use 91% isopropyl alcohol and new clean soft bristle tooth brush but did not completely disassemble-- i did remove logic/mother board and focused on all its contacts. I will redo with complete dis-assembly. If still fails, any recommendation on display assembly source/quality? Thanks again.

Tom Retson tarafından 25 Tem 2013

Update: disassembly and reclean did not work. I noted that of the 4 moisture indicators on the unit only one (near flash/assist light) had any indication of discoloration. I checked ebay and found several LCD/digitizer assemblies for sale. Unless other suggestions, i will start bidding or just buy a one of those ($150-$200). Anyone know if it possible to test by just connecting another Note 2 LCD pin connector to my mother board (without moving other components)?

Tom Retson tarafından 26 Tem 2013

Update2: Impressive Mr Turkey. Now i need to find a meter with small enough probes. Maybe i can tape pins to my basic home owner unit. I assume back cover off, power on operation is possible...?? Checking your graciously provided schematics, i couldn't find L706, L705 or PMIC U500. Do i need better glasses or ? In any case, i cant solder something that small but, if voltage tests all positive it does confirm need for LCD. Thanks. Your assist again appreciated. Thumbs up

Tom Retson tarafından 26 Tem 2013

Im having the same problem...

Everything works... and angled light shows everything...

That means the backlight is not working...

Repair shop asked 5000 rupees to change the whole display...

I wish there was a way to fix the backlight...

alvin manoj tarafından 12 Eki 2021

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oldturkey03 @oldturkey03

İtibar: 732,3b

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Gönderildi: 25 Tem 2013

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Tom Retson, you wont need a new digitizer. From what you are describing, the digitizer still works, but your LCD does not. the LCD contains the backlight. Angle a light against the LCD and see if you see any outlines at all. You did not tell us how your cleaned the logic board. I strongly suggest 90%+ isopropyl alcohol as well as a soft bush. Clean the logic board and all connectors very carefully. you may have to repeat this step a couple of times. After that, reassemble your phone and re-evaluate. If you still do not see anything, it is possible that you still need a new display assembly.

==Update ==

I attached the flow sheet for the LCD trouble shooting as well as the schematic for the connector and the part reference. Hope this helps.

Added that part of the component layout....;-)

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4 Comments:

UPDATE and Epilog...i hope... I was able to detect voltage across (some) contacts with my less than appropriate multimeter. So, i bought a high quality used (after inquiry/response with seller) LCD/Digitizer assembly and installed it. 3 days of successful operation with no indication of any performance degradation. I'm opening my Note 2 repair shop next week.... ;-) Thanks again for assist.

Tom Retson tarafından 1 Ağu 2013

Tom Retson, good job in getting it accomplished. Best of luck with your repair shop.

oldturkey03 tarafından 1 Ağu 2013

Hello oldturkey03, were do you get your troubleshooting flowcharts from?

Sinaka Sanders tarafından 30 Haz 2015

Hi @oldturkey03 , Thanks for the so beautiful explanation. I got same problem in my Xiaomi Redmi Note 4. Here is my analysis: Except Display backlight, everything is working perfectly fine. As per your suggestion in the answer, I tried putting external flash light to my display and I can see everything on the screen on my phone from an angle and on basis of that, I am able to operate my phone. Touch is also working perfectly. Please suggest what should I try. Thanks. :)

perry garg tarafından 27 Ara 2017

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Thanks for quick and helpful reply. Much appreciated. Angled light does not reveal any outlines. I did use 91% isopropyl alcohol and new clean soft bristle tooth brush but did not completely disassemble-- i did remove logic/mother board and focused on all its contacts. I will redo with complete dis-assembly. If still fails, any recommendation on display assembly source/quality? Thanks again. — Tom Retson
Update: disassembly and reclean did not work. I noted that of the 4 moisture indicators on the unit only one (near flash/assist light) had any indication of discoloration. I checked ebay and found several LCD/digitizer assemblies for sale. Unless other suggestions, i will start bidding or just buy a one of those ($150-$200). Anyone know if it possible to test by just connecting another Note 2 LCD pin connector to my mother board (without moving other components)? — Tom Retson
Update2: Impressive Mr Turkey. Now i need to find a meter with small enough probes. Maybe i can tape pins to my basic home owner unit. I assume back cover off, power on operation is possible...?? Checking your graciously provided schematics, i couldn't find L706, L705 or PMIC U500. Do i need better glasses or ? In any case, i cant solder something that small but, if voltage tests all positive it does confirm need for LCD. Thanks. Your assist again appreciated. Thumbs up — Tom Retson
Im having the same problem...

Everything works... and angled light shows everything...

That means the backlight is not working...

Repair shop asked 5000 rupees to change the whole display...

I wish there was a way to fix the backlight... — alvin manoj
UPDATE and Epilog...i hope... I was able to detect voltage across (some) contacts with my less than appropriate multimeter. So, i bought a high quality used (after inquiry/response with seller) LCD/Digitizer assembly and installed it. 3 days of successful operation with no indication of any performance degradation. I'm opening my Note 2 repair shop next week.... ;-) Thanks again for assist. — Tom Retson
Tom Retson, good job in getting it accomplished. Best of luck with your repair shop. — oldturkey03
Hello oldturkey03, were do you get your troubleshooting flowcharts from? — Sinaka Sanders
Hi @oldturkey03 , Thanks for the so beautiful explanation. I got same problem in my Xiaomi Redmi Note 4. Here is my analysis: Except Display backlight, everything is working perfectly fine. As per your suggestion in the answer, I tried putting external flash light to my display and I can see everything on the screen on my phone from an angle and on basis of that, I am able to operate my phone. Touch is also working perfectly. Please suggest what should I try. Thanks. :) — perry garg

kemmark.amantillo @kemmarkama42227 İtibar: 1 · Answer 1 · 2020-03-12T03:36:46-07:00

kemmark.amantillo @kemmarkama42227

İtibar: 1

Gönderildi: 12 Mar 2020

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my huawei p10 got battery bloated ..when i try to fix the battery it works but the problem is the backlight how can i fix this?/

pls help me???

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Samsung Galaxy Note II

No backlight after light water- all else seems to work

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