Question about Toshiba 50L4300U 50" 1080p LED-LCD TV - 16:9 - HDTV 1080p 1920 x 1080 - Audyssey EQ, Audyssey ABX, Audyssey Dynamic Volume - 4 x HDMI - USB - Ethernet - Wi-Fi - PC Streaming - Internet Access - Media Player

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I have a 50 inch Toshiba 50L4300U that has no picture but has sound. What board do I replace?

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  • Toshiba Master
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Do this test first. With the TV on normally, shine a flashlight on the screen. look for a dim moving picture.
1) If you see one, the backlight led driver isn't working.
2) If you DON'T see a picture replace the T-Con board.
You can get parts here: www.shopjimmy.com TV Parts Universal TV Stands DLP Chips ShopJimmy

Posted on Dec 21, 2016

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  • Laurie Kaczmarek
    Laurie Kaczmarek Dec 21, 2016

    Which board is which? What is the bed number for the back light led driver?

  • Lawrence Oravetz Dec 22, 2016

    The folks at shopjimmy can give you that information for your model TV. They are great to do business with.

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My toshiba TV 50L4300u goes from clear to blurry back to clear every other second


Sounds like back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

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Screen moving in and out of focus regardless of input or settings


Fault to its T'Con board. Replace it. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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I have a horizontal line about 1/3 way down from top of tv, resulting in bottom 2/3 with slightly "blurry" picture alternating with normal picture every couple seconds. Any tricks, tips or diagonstic


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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Back-light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/

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Check fuses and breakers on Polk.
If they are ok then take it to the shop.

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1 Answer

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not knowing the model number just a general answer: Click is likely a mechanical power relay that should do that--problem likely in power supply of set or something triggering protective shutdown elsewhere in set, a bit like saying my car won't start as a number of different reasons for this issue.

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