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28MT49S

mkiv87

Aug 24, 2022
2
Joined
Aug 24, 2022
Messages
2
Hello! I have an LG model 28MT49S that does not turn on. I have disassembled the casing and an integrated circuit can be seen that seems burnt. I decided to buy a used board on Ebay because I couldn't repair this one and now I have a "different" problem to which you may have an answer...
The fact is that I have mounted the used board that I bought and the result is that the TV turns on but shows the image with a pinkish tone.
The ebay seller sent me another board and I still get the same result, pink image tones and poor resolution... Any other damaged components? different firmware?

The original board and the two that have been sent to me are reference EAX672581 03 (1.0)
The only thing I see that changes is a sticker that shows a V03.60.01 and V3.09.1 and the original was V3.55.02 and V3.08.1
I have searched how to access the service menu and looking for information it seems that I should change LVDS Bit in TOOL OPTION 1 from the option that I have to the other available, I have done it with both cards and I continue with the problem. Is there any other option to modify?

Thanks for the attention!
 

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kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
Show an image of a proper test card or colour stripes from a colour pattern generator. This is the only way to determine if the colours are correct. You can probably get one from a PC program (or make your own static picture and put it in the VGA port on the TV).
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
Yup, looks like the red signal is missing some 'bits'. Could be a cabling issue - try replacing the twisted pairs (or ribbon cable) between the LVDS port and the display and/or check for missing/bad connections at the relevant pins therein.
 
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