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Old 02-21-2020, 05:12 PM   #1
boonehockey
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Join Date: Feb 2020
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Default Toshiba backlight not turning on

Hello,

I have a Toshiba 50L711U18 and the backlight is not turning on. Tried using a flashlight and I CAN see an image. My phone also tries to connect to the chromecast on it as well. These two things are telling me that the T-con board and the main board are most likely working properly. I opened up the front of the display to get at the backlights. When testing them I noticed that a few of them are a dark blue, almost purple color. I read that they might be on their way out, could these few bad LEDs stop the rest of the backlight array from turning on?

I left the TV unplugged overnight, when I plugged it in again the backlights did turn on for 10-15 seconds then shut off and flashed a 12 red light code. I also got a 5 flash code once but it hasnít returned, the 12 is consistent. I plan on pulling the display off again and rechecking the LEDs, any other troubleshooting help would be much appreciated. I will post my voltages in an attachment.
Attached Images
File Type: jpg 20200221_145224.jpg (579.4 KB, 10 views)
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File Type: jpg 20200221_145253.jpg (439.0 KB, 7 views)
File Type: jpg 20200221_145303.jpg (373.6 KB, 6 views)
File Type: jpg 20200221_145310.jpg (591.6 KB, 6 views)
File Type: jpg 20200221_145327.jpg (634.6 KB, 8 views)
File Type: jpg tv voltages.jpg (84.3 KB, 11 views)
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Old 02-21-2020, 05:21 PM   #2
diif
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Default Re: Toshiba backlight not turning on

Yes the LEDs/strips need to be replaced.
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Old 02-21-2020, 11:18 PM   #3
jjanssen7
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Default Re: Toshiba backlight not turning on

I have a set of new backlight strips for that TV. PM me if interested.
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