I have a Sharp - 50" Class - LED - 1080p - Smart - HDTV Roku TV Model:LC-50LB481U with a very dark screen. If I shine a flashlight on the screen I can see it's on, but the image is incredibly dark
Unless you look very carefully, it looks like it's off. I can hear the audio works. Can anyone tell me which board needs to be replaced?
Televison & Video - Sharp
Answers & Comments
Https://www.shopjimmy.com/sharp-tt5008t-v1-00-v0-00-replacement-led-backlight-strips-12-lc-50lb481c-lc-50lb481u.htm
This is the part that needs replaced. It is not a board problem.
Thanks for the input. You are correct, although I didn't see this until 9 months after I fixed it. I ended up removing all the LED strips and connecting three 9-volt batteries to my voltage meter's leads and basically turned my voltage meter into a temporary power supply. Supplying the strips with voltage I was able to see which LED's were burnt out. I ordered 50 individual LED's from china for about $9. Using a hot plate heating element under a microscope I was able to replace just the burned out LED's. Once the burned out ones were replaced, the entire strip lit up like a christmas tree. I think there were no more than 6 to 8 that needed replacing. All 66-ish are now working great. I forget the actaul number but that could be it. I turned the backlight down to 50% to try to make sure that doesn't happen again. My only concern is why they burned out to begin with. Doing the math I feel theres just too many volts coming from the power supply but I'm not smart enough to confirm. Seems to me each LED is receiving 3.9-ish volts when only 3V is required. I could be wrong. I was wrong once in 1978 when I said it's not going to snow. Anyway thank you.