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The LG 60LM6450 is a 60-inch LED television released in 2012. It supports 3D video with glasses at a resolution of 1920x1080 pixels.

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LG55UH850V backlight changed but black screen with sound still

Hi,

I’m wondering if anyone can help. We have an LG 55UH850V. The tv has a problem where the screen goes black and the sounds stays on, when looking at with a torch you can see an image. I have replaced the edge lit backlight and changed the power board but still have the same issue. Can anyone point me in the direction of what to try next? Could it be I’ve installed a faulty backlight? The metal strip at the bottom of the tv (where the backlight is) seems to get really hot. Should a backlight be hot? Could the main board also cause this issue?

Thanks in advance for any replies.

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I’ve added some photos to Google Drive to show the inside of the tv. I couldn’t figure out how to add them on here.

https://drive.google.com/drive/folders/1...

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Hi @lewyb

With some LG TVs there is an inverter board associated with the LCD panel i.e. part of the panel but I don’t know about your model.

Here’s a link to the service manual for your TV (I think). The translation seems to indicate that it is. It is a .rar type file and I haven’t downloaded it to check but maybe scan it for viruses first before opening it, just to be sure.

Usually LG service manuals have good troubleshooting flowcharts and some schematics to help find problems such as no video etc.

Hopefully this is of some help.

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Thanks for pointing me in this direction. I’ll check it out ?I’ve added some photos of this helps.

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@lewyb

Here's how to add images to your question on iFixit. 在已经存在的问题里加入图片

Not being picky but they have to be a bit more of a close up picture to see if there is anything relevant ;-)

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is the back light inverter a seperat board or built into the power board? is it LED right? i dont think LED should be hot. is there a seperat lodgic board down there that might be pumping the heat out?

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Thanks for replying. I’ve added some pictures. I don’t think the inverter is a seperate board. I think it’s attached to the PSU but I could be wrong. The other boards at the bottom have the flat cables from the main board plugged in. The heat seems to be all along the bottom strip where the led backlight is.

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