Chosen Solution
I have a Vizio 70” E700i-B3. It has sound but a black screen. I’m not sure how well my torch test has been but other than some ghost-like flashes when all the lights are out in the house I don’t see anything on the screen. The Vizio support hotline said it has to be the backlight, which Vizio itself doesn’t stock, but I can’t find a part called “backlight” on part supplies sites. What are the possible causes? I see T-Con boards, power supply boards and main boards. Is there another name for a backlight? Is it the backlight if I don’t see anything on the screen with a torchlight?
r asa since you can see the background with a flashlight beam it is most likely the backlight array. (I seem to somewhat recall that there are other more sinister reasons why the back lights don’t work but can’t quite recall what the reason for that was). The backlights are strips that have LEDs on them that provide the backlight. Check the label that is glued to your LCD panel. There will be a model number listed for your panel. Use that number and do an online search for backlight strips. It’s a bit of a PITA to replace since you will have to disassemble the LCD panel but it is absolutely doable. Yours is a large panel so make sure that you keep it an a level surface and do not flex it. It is easily ruined. Also, remember that Vizio uses a hodgepodge of parts and their quality of manufacturing is at best mediocre you do want to go ahead and check that all cables are properly seated and that all the connector are still properly soldered to their respective boards. Part number for your panels backlights is most likely E700DLB003-002
