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How do I fix no video but sound on an LG smart TV ?

I replaced the T-con control board and still the same problem. The TV powers up and the LG symbol appears for a brief moment and the screen goes blank. I hear sound and when attached to cable, I hear the channel playing! What do I need to replace ?

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  • LG Master
  • 681 Answers

Hi Michael,
This is the sad story of many a so called smart TVs. I have repaired several of Samsung smart TVs. It is the back light in the panel which fails and company guys advise you for a panel replacement. Once you can see LG symbol means the Tcon is working. It is not the picture which is disappearing, it is the failed backlight which is not there and so you can not see anything. Repairing panel is a tricky job and you need a certain amount of expertise for this. Otherwise you may damage it beyond repairs.

Posted on May 03, 2015

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  • LG Master
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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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Posted on Apr 25, 2015

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  • LG Master
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You can replace almost everything in the TV and still don't have video, when you forget to replace the defective part. Don't replace what you believe is defect. Not even replace things you are convinced they must ben defect. Only replace this things you found to be defect after correct measurements and good diagnose. That is what a tech, after years of learning and practicing his job gives as an advice. Please when you can't do the diagnose yourself, ask a tech or bring it to a repair shop. It will save you lots of time, frustration and money.

Posted on Apr 25, 2015

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Posted on Jan 02, 2017

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