i'm trying to fix this tv for a friend of a friend, but i have never seen a problem like this before and have no idea where to start.
The tv, according to a manual i found the red led is standby and goes out when turned on. When i plug in the tv the red light comes on and i get 13.5v (too high?) at the 12v pins and 5v at the 5v pins. the backlight connector is showing 60v and the panel does not light up. i have tried the flashlight method, but nothing on screen that i can see (no dim flash of any sort, either). I am unable to turn the tv back off as pressing the power button does nothing and has to be unplugged and plugged back in to go back to standby.
the caps all tested good on the power supply board. (first thing i checked).
so what i think i am looking at is a bad backlight and mainboard but that is mostly just a guess. i'm stumped. multiple seemingly unrelated problems?
thanks for reading through and potential solutions
The tv, according to a manual i found the red led is standby and goes out when turned on. When i plug in the tv the red light comes on and i get 13.5v (too high?) at the 12v pins and 5v at the 5v pins. the backlight connector is showing 60v and the panel does not light up. i have tried the flashlight method, but nothing on screen that i can see (no dim flash of any sort, either). I am unable to turn the tv back off as pressing the power button does nothing and has to be unplugged and plugged back in to go back to standby.
the caps all tested good on the power supply board. (first thing i checked).
so what i think i am looking at is a bad backlight and mainboard but that is mostly just a guess. i'm stumped. multiple seemingly unrelated problems?
thanks for reading through and potential solutions

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