Chosen Solution
I have a Toshiba R950 with a faulty LED blacklight. The screen is very dark and you can see text when you use a strong light. So it is a blacklight problem. I have ordered a screen from china, with a higher resolution, but same 40 pin and almost the same screen model number. The blacklight was working, but the screen was green and blurry. I swapped the china screen with the old one, the old one has still no blacklight. After swapping once again, the china screen also has no blacklight anymore! I have ordered the same screen as the original from the Netherlands, but it has also no blacklight. So I have 3 screens with no blacklight. What can be the problem? I think it is maybe the invertor, but that is mounted on the screen, so I don’t know. Thank you in advance.
@kevinb1012 it is possible that the screen with the " almost the same screen model number" has shorted out your backlight circuitry. Since it is an LED backlight there is no separate inverter. The driver and converter for the LED’s are all part of the motherboard. You would need a schematic and layout for your specific motherboard. Take a good look at all the components on your board and see if you notice any obvious damage. Sometimes it helps if you post some images of both sides of the board with your question. Use this guide Adding images to an existing question for that. Even within the same model you may have variations on the motherboard. You need to identify that first. Bigger issue here is that you are dealing with a Toshiba. That company is as paranoid and secretive as Apple, maybe even more. Finding any schematic etc. is almost impossible.
I have the same problem. I had a look at the motherboard, but did not find any fuse. where is it located?
i have a toshiba 55l7453D model all my backlightsa work been tested with backlight meter all led working fine but when turn of tv by plug our standby and turn back on nothing black screen but u can here and see pic in background give it a knock they come on after awhile they go off but sometimes stay on till u turn tv off again bit of a knock our wobble of tv come back on and works fine dont understand because all led work pleaae help
