I can seen even very dark image
I have the same problem.
Mine TV (QM16.3E LA - 49PUS6551/120 ) gave up yesterday, after almost 4 years. Screen went black all of the sudden, I tried all kind of resets, power drain but still is black.
All other works, sound, ambilight, I can seen even very dark image - UI of Android so I believe it can be only defective backlight, or?
Any chance to verify that LED strips are failed only? I've seen a videos how to change them, but I would like to rule out T-Con board, or power supply. I am going through the service manual but still not sure where I could measure voltage on PSU or T-Con to test if LED strips are getting power. I don't want to do such work before knowing it is the root cause :(
Any idea please?