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Repair guides and support for your LG TV.

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Burnt interconnect cable on LG 65UT7570PUB. Worth fixing?

I have an LG 65UT7570PUB manufactured in 05/2024 and purchased just over a year ago (just outside of warranty 😡). The issue is the display doesn't show any video, but the backlight is working. I've opened the unit, and found that one of the panel interconnect cables (47-6042005-FPC) must have shorted or something because there's a bit of scorching on some of the pins on the cable and the connector for the panel.

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I tried cleaning the scorched pins with isopropyl alcohol, but they still look pretty bad and at least two pins are shorted on the cable. I can't tell if there are any shorted pins on the connector with the naked eye, and cleaned that as well with isopropyl alcohol.

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I've had no luck using the tape method to block the scorched pins. Removing the broken ribbon cable, 3/4 of the panel shows black, with the one panel showing white, but still nothing is displayed at all.

Is it even worth it to try and get a replacement interconnect cable, or if there was a short enough to create scorch marks, would that have damaged the whole panel and it's a not worth the effort? Has anyone seen anything like this with the LG 65UT7570PUB or similar models?

Any advice appreciated. Thanks

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stable cables do not emit magic smoke without help from something else - unless it occurred after some repair or movement that improperly connected the cable or a mfg defect.

If there is burning, then there must have been a high current thru them.

That could have been caused by a driver circuit failure putting too much voltage on the line and causing a panel failure which caused the high current, or it could have been a panel failure by itself that drew too much current.

Either of the above, for me, would rule out a repair.

A cable issue MIGHT be repairable but the high current likely damaged something else - that might just be the tcon board, which would be repairable, but not if the panel were affected.

Unless u find some other clues, it impossible to narrow it down.

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Thanks @ruggb, I was figuratively shocked when i saw the damage. Is there anyway to assess if the panels are damaged in the state it's in? I already ordered some replacement 47-6042005-FPC interconnect cables, so I will see if that fixes things. I think if replacing the cables fix it, i won't invest more in a new tcon board without knowing that the panel is unaffected.

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I don't believe there is any way to test a panel short of factory equipment.

I would take the tcon board out and test all the devices you can b4 powering it up. All the parts that were bad on my boards (two Panasonics) were MOSFETs and were cheap at Aliexpress, If you find nothing wrong there, then I would guess the panel has to be the culprit.

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