Hi, I'm back.
Unfortunately, nothing of this kind under the heatsink...

Sure, i will remove the heatsink and pot a picture....

Hello
Could you advise which could be the hdmi chip? And what temperature to use for heating? Instead of a hair dryer, i would use a hat air gun, but it has digital control and i can set any temperature starting from room temperature. I trust this one better....

Sorry, i was a little busy, will get back adter i check....

Hello nomoresonys
Thanks, but this mainboard doesn't have a reset button, i checked carefully....

Hello tiki66
Thank you for the firmware.
I tried, but unfortunately no success. I still think that this is a hardware problem. Even the P_ON signal appears after a looooong time (10 of minutes.)...

Here are some pictures.
Pink stuff is not always the same, i even saw a few times the TCL log, on normal picture.
Since then i never left it to warm for hours, so i never got sunday's result again....

Hello
I received from a friend from Norway a faulty TCL U55C7006 TV
TV had a white power led on when powered on, later the LED went off, but no picture.
Initially i thought that it has a bad backlight. I tested the led strips with a tester but they proved good. I also checked the screen with a powerful flashlight, but no sign of any signal on screen.
I made some research and i discovered that the TV is an Android TV and the fault i have is often connected to a firmware problem.
I downloaded some firmware images and made some trials.
I tried with 3 different...