Hi, I have problem with this LG model 55UB8500, it have no picture,I check voltage in Power Supply , all the voltages 24 volts 12 volts, 3.5 volts are there, when I push power ON, it have Red led on main board it stays red no blinking, on the power supply board when I put Power ON on connector P 802 LED + it have 48 volts on connector P 802 Led+ 48 volts, could you tell me what I have to check now?
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LG 55UB8500 no picture.
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Re: LG 55UB8500 no picture.
Tv turning on with backlight but no picture, tcon board is first suspect. Connect one side at a time between tcon and panel to see if you get half an image. If you do, there is a panel short on the bad side and you can try the tape cutoff method. If no side displays an image, it is worth trying to replace the tcon.
OK, just noticed no voltage on fuse. Should have 12V with TV on. 12V is typically switched with a FET on the main board when you turn the TV on and passes through several pins of the LVDS connector.Last edited by neilc6; 07-29-2022, 11:14 AM.
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Re: LG 55UB8500 no picture.
Originally posted by Fripacks View PostDo you have location number?I assume no responsibility for any stupid suggestions I might post.
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Re: LG 55UB8500 no picture.
Originally posted by Fripacks View PostI check and they have 400 volts, on my first post I told I have voltages on the plug who's goes on Main BoardLast edited by nomoresonys; 07-29-2022, 12:12 PM.
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