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Repair guides and support for your LG TV.

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Repairable? LG OLED black screen of death

Hi, My LG TV from 2018 - model OLED55B7T - over about 4 hours went from normal function, to displaying a fully black screen for a few seconds, and now is completely black. TV is on, I can hear sound, but nothing at all is displayed on screen, no matter what buttons/menu’s I try and enter.

Question is, has anyone repaired a TV from a similar state back to working condition or am I wasting my time to even try? Technicians are expensive here (Australia) for them just to even turn up and assess.

TIA.

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I have taken the back off, no obvious fried components. There is a large power supply PCB, a smaller PCB that controls the screen, and other bits and bobs. I can but spares of these, but each one is about ~15% of the replacement cost. Any confident opinions on which board to replace?

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Hi @stu78

Do you have a DMM (digital multimeter) and know how to use it?

If so here's the No video/normal audio troubleshooting flowchart from the service manual for the TV.

Follow the flowchart to determine whether the problem is in the screen, the screen power board, the main power board or the mainboard.

FYI: power board (module) is the board that controls the screen - i.e. module=screen, sheet A1 is on p.39 and sheet A9 is on p.52

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Thanks, that’s super useful. I did not realise access to these manuals was possible outside of LG

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@stu78

Not all TV models service manuals are available. You were lucky ;-)

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