Chosen Solution
Trying to fix a Semi-Working TV I got for free.
There is a picture, but the backlight is ON only in one-quarter of the screen:
*The screen after disassembly For a brief period when turning on the TV, all LEDs flicker fast for about 1s period. then just one quarter remains lit. I couldn’t find anything obviously wrong with the LED control board no bulging CAPS or something obviously burned.
power supply lines to that board from the main PSU (8 lines of 24V) all seem to work. I’ve unplugged and plugged all relevant connectors Any advice on what can be wrong…
@moshiko check the individual LEDs. I am sure you’ll find one or two that have failed and may cause the array to behave like it does. If you can get your hands on a LED backlight tester you could get this reasonably quick diagnosed. Just in case you do not it will most likely be the LED driver board and there are no schematics readily available. So, a replacement may be needed. Remember that Toshiba is just another company like APPLE and many others, who enforce planned obsolescence by not releasing any service manuals or any service information to people like us. So we cannot expect any assistance from them in that aspect.
