Backlight is not turning on

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Toshiba Television

Repair guides and support for your Toshiba TV.

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Tyler Saboe @tylersaboe

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投稿日: 2020年2月21日

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Backlight is not turning on

Hello,

I have a Toshiba 50L711U18, 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 hasn’t 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.

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oldturkey03 @oldturkey03

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投稿日: 2020年2月22日

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Tyler Saboe “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”, absolutely! Since your backlight comes on for a few seconds and since you have a positive flashlight test, this sounds like failed backlight strips. Replace those strips since the LED’s have delaminated. Replacing the strips should fix this issue.

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Thank you for your response! I cant seem to find any backlight strips but I will keep looking, have you had any success with replacing single LEDs? I have been looking on Digikey and Mouser for SMD LED's and there are a ton of styles. I will have to pop the diffuser lens off and take a measurement of the LED, any other suggestions for the options, current, color?

Tyler Saboe さんによる2020年2月22日

It's a PITA to replace single LED's but it should be possible (depends on the strips). Do a search for the backlight strips based on the panel number vs. Toshiba model number.

oldturkey03 さんによる2020年2月22日

Well I ended up getting it fixed, one of the strips connectors lost connection at the solder joint. Touched the connection up and it's stayed on. Thank you for your help.

Tyler Saboe さんによる2020年2月22日

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Thank you for your response! I cant seem to find any backlight strips but I will keep looking, have you had any success with replacing single LEDs? I have been looking on Digikey and Mouser for SMD LED's and there are a ton of styles. I will have to pop the diffuser lens off and take a measurement of the LED, any other suggestions for the options, current, color? — Tyler Saboe
It's a PITA to replace single LED's but it should be possible (depends on the strips). Do a search for the backlight strips based on the panel number vs. Toshiba model number. — oldturkey03
Well I ended up getting it fixed, one of the strips connectors lost connection at the solder joint. Touched the connection up and it's stayed on. Thank you for your help. — Tyler Saboe

Toshiba Television

Backlight is not turning on

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