How to fix blank screen on SONY BRAVIA 55" UHD TV? 

I have the same model as you and having the same issue. Do you follow 100% as the video and your display quality back to normal 100% or is it drop?

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Hello we can fix that problem its repairable. How old is your tv. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-PI4RvZ1QTbs.htmlsi=bl05MF-dRGtdANwl

Had same problem. Replaced Tcon board didn't fix it. Now it just show blank

Vai

Apnar phone number ta din

Fluctuation of odd even voltages are normal. Use any universal board(FHD/UHD) & backlight tester to check panel firstly.

@@VcoreLC The backlight is ON without any abnormal behaviour. You can say it's normal from each edge to the centre. Thank you for the fluctuation thing, I thought that it's shorted :). But, if I understand it correctly now, it's just switching on and off and that's why you can see these fluctuations. I'd use my display tester, but don't have for now adapter to convert from TKDMR to this display, or T-con in it. I've ordered some on Aliexpress, but waiting on them. I can't test this display otherwise. With the 2nd mainboard, the backlight was ON, so still I need to figure out what's wrong with this mainboard. Thank you for your time on my problem just by the way :).

U have backlight On ,mainboard On what's the symptom on display , most mainboard issues are easy to isolate by looking the symptom of screen, like for panel issue mostly its blank screen,jumping ,double image , lines , black shade Mainboard issues thats reflected on Display = Scrambled text , colored patterns or textures , Or just menu and other things works but no picture via input

@@premkxk I don't have a problem with many issues, but here is no picture no matter what I try. I did try to insolate signals, but nothing is working. I'll go back to it in Jan 2023, for now is back in one piece. I'll show the progress on this/my RU-vid channel when I'll have a chance :). Thank you.

Did you fix the problem in the end? IF so, how? and what appeared to be the actual problem?