LG 37 inch lcd tv with horizontal lines.

[Acerman]

I have an LCD LG 37 inch tv with a fault. When powered on , initially the tv works completely normally with a good clear picture and sound. After approximately 10 minutes, 2 or 3 horizontal lines appear at the very top of the screen. Within a further 30 seconds more lines rapidly appear further down the screen. ALso the picture begins to freeze aswell. SOund remains normal. After a little more time the picture is becomes very distorted throughout the whole of the screen. If powered off, the problem remains. However, if unplugged for half an hour , the picture does return to normal, but only for 10 minutes when these problems start all over again. Anyone have any ideas. I am thinking maybe the t con.

[ReeceyBurger123]

Re: LG 37 inch lcd tv with horizontal lines.

Guessing LC370WUE Panel ? Ive been able to fix one by replacing the ribbons from Tcon to Lcd but no luck with the others Ive had panel issue.

[johns1mj]

Re: LG 37 inch lcd tv with horizontal lines.

You can use a hair drier to heat the t-con prior to turning on the tv. This will help diagnosis if the t-con is heating up and failing. You could also try cooling spray to cool the t-con after it acts up to see if it return to normal faster.

[Acerman]

Re: LG 37 inch lcd tv with horizontal lines.

Thanks for the quick responses.
Yes reeceyburger I thought it could be the panel. The screen does look like a faulty lcd panel after it has become distorted, but I am not sure as it works perfectly for a few minutes. Usually , if an lcd panel is faulty , the problem isn,t intermittent.
I have some compressed air cans and will maybe try and spray it after the problem has started.
I think there may be a heat related issue. The problem doesn't start until the tv has been on for 10 minutes and so has become warm.
I read another thread and it suggested checking the ribbon cable from the tcon. I will get the back oof the tv tomorow and maybe check the ribbon cables and give them a clean with servisol.

[Acerman]

Re: LG 37 inch lcd tv with horizontal lines.

Many thanks. Some good simple tricks to try.

[Acerman]

Re: LG 37 inch lcd tv with horizontal lines.

The model is LG 37LH3000.

[Acerman]

Re: LG 37 inch lcd tv with horizontal lines.

I removed the back cover and tcon cover this morning. I tried using a hair dryer to warm the tcon before switching on. The result of this is that the problem kicked in quicker. The lines started to appear after 5 minutes instead of 10. I also then cooled the tcon with compressed air spray. This restored the screen to normal but only for a few minutes afer which the lines started to appear again. I am thinking that the tcon is failing when it becomes warm.

[ReeceyBurger123]

Re: LG 37 inch lcd tv with horizontal lines.

Maybe, what Tcon is it ? Possibly voltage reg falling out of spec when heated.

[Acerman]

Re: LG 37 inch lcd tv with horizontal lines.

The tcon model number is 6870c-0247A. It also works for a Sanyo model aswell as my 37 inch LG.
http://www.ebay.co.uk/itm/3219004638...%3AMEBIDX%3AIT

[Acerman]

Re: LG 37 inch lcd tv with horizontal lines.

I bought a used tcon from ebay this week. I have fitted it this morning and all is well with the TV. The fault has gone. SO, it was a faulty Tcon. Thanks for all contributions. The test with the compressed air confirmed it.