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LG42LA6208 logo flashes and very faint image

Hi all,

when i switch on the TV the LG logo flashes for just a fraction of a second, then the TV screen goes dark. when i switch the settings on you can very very faintly see the outlines and text in the dark, but extremely faint you have to be next to the screen to see it distinctively. when i switch it off the red light flashes bout 4 times.

i thought it was the main board, replaced it with one from a tv that had a cracked lcd, but the problem remained the same exactly. so obviously not that :(, just my stroke of luck as always :)

so any of you might have a clue on how to fix it, is it the power supply, tcon?

hope you can help me, if i can do it my self it might be worth the while, turning in a 5 year old TV to a repair sop might be better just buying a new one.

cheers and thank you in advance!!!

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@cromag …sounds like a bad led. you have image on the screen still so i dont think its the tcon. you can test the power supply voltage going to the leds and see if it is feeding the voltage it needs. if its present, id look at troubleshooting/replacing the leds. if not, troubleshoot the power supply.

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Hi @cromag ,

Here’s an image taken from p.93 of the service manual for the TV showing the No Video / No audio troubleshooting flowchart which may be a good place to start and also the manual has full schematics which helps.

Unfortunately you have to sign up to download the manual, but if you persevere you can go through it by using the page numbers at the bottom of the document. It’s tedious but you’ll soon get the hang of it

Start at p.93 and go on from there.

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(click on image to enlarge for better viewing)

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