LG 47LH30 Horizontal Lines in screen

[Mr Bill]

I am unsure if its a bad t-con or panel?
The caps on the power board are not bulged but they are "sam young" brand. If you pull the menu up the lines go through it also. Does anyone has any opinions or testing methods if possible? Thanks in advance.

[PlainBill]

Re: LG 47LH30 Horizontal Lines in screen

I'd try cleaning and reseating the flex strips that go from the tcon to the panel. If that doesn't change anything, try a new tcon. If that doesn't fix it, sell it for parts, it's the panel.

PlainBill

[Mr Bill]

Re: LG 47LH30 Horizontal Lines in screen

I cleaned and reseated the flex strips. It improved very minimal. The panel itself has 2 ribbons, left side and right side. For giggles i unhooked the left side and the picture still had lines but very few. I then unhooked the left side and connected the right side and it was perfect. Both together and i'm back to square one. Does this seem like a panel issue? I'm leaning on taking the ebay gamble but i just want some input. Worst case i could try and resell the tcon board or i could return it and pay the restock fee.

[klkmalik]

Re: LG 47LH30 Horizontal Lines in screen

I am unsure if its a bad t-con or panel?
The caps on the power board are not bulged but they are "sam young" brand. If you pull the menu up the lines go through it also. Does anyone has any opinions or testing methods if possible? Thanks in advance.

First make sure, where is problem? lcd screen or logic board (vga).
second try to increase value of vga board + line voltage cap.
Third check menu buttons loose or try joint and all cable.
I hope this will help u.
thanks.

[tom66]

Re: LG 47LH30 Horizontal Lines in screen

I cleaned and reseated the flex strips. It improved very minimal. The panel itself has 2 ribbons, left side and right side. For giggles i unhooked the left side and the picture still had lines but very few. I then unhooked the left side and connected the right side and it was perfect. Both together and i'm back to square one. Does this seem like a panel issue? I'm leaning on taking the ebay gamble but i just want some input. Worst case i could try and resell the tcon board or i could return it and pay the restock fee.

T-cons are cheap I would go for it, sounds a lot like a T-con problem.

Do the lines move on the screen, or are they fixed?

[Mr Bill]

Re: LG 47LH30 Horizontal Lines in screen

T-cons are cheap I would go for it, sounds a lot like a T-con problem.

Do the lines move on the screen, or are they fixed?

They move

[tom66]

Re: LG 47LH30 Horizontal Lines in screen

They move

Not a bad panel then. You should have mentioned this.

I'd say "almost" certainly T-con board. As menus are affected by it, it's less likely to be the main board (but it could still be it.)

[Mr Bill]

Re: LG 47LH30 Horizontal Lines in screen

Not a bad panel then. You should have mentioned this.

I was unaware of this. I will remember for future reference. I ordered a tcon off of ebay. I'll post the results in 5 days or so.

Thanks Tom

[tom66]

Re: LG 47LH30 Horizontal Lines in screen

I was unaware of this. I will remember for future reference. I ordered a tcon off of ebay. I'll post the results in 5 days or so.

Thanks Tom

The panel is a fixed array of pixels, it can't really make glitches move on the screen; they just tend to stay fixed e.g. rows/columns missing, incorrectly lit lines, strong motion blurring etc. The T-con on the other hand controls the panel with serial data, it sends the correct signals to light up the right rows and pixels, so any bug on it which is slightly out of sync with the rest of it (e.g. a bad switching IC) will cause odd artefacts like this. Personally I'm leaning to a bad solder joint, a noisy LDO or a bad ceramic cap (which rarely, but not never fail.)

There is a possibility a bad power supply could cause this problem but I would call it unlikely as it would usually cause problems with the rest of the TV if it got this bad.

[Mr Bill]

Re: LG 47LH30 Horizontal Lines in screen

I got the replacement t-con today in the mail it did not work. Still the same as before. So whats the next plan of attack? VGA/Main board or bad power supply. There is not that many caps on the board. I'm going to see if i have some spares and swap each one out individually and see (pray) if it goes away.

[tom66]

Re: LG 47LH30 Horizontal Lines in screen

I got the replacement t-con today in the mail it did not work. Still the same as before. So whats the next plan of attack? VGA/Main board or bad power supply. There is not that many caps on the board. I'm going to see if i have some spares and swap each one out individually and see (pray) if it goes away.

A bad cap could cause this issue but I would call it rare. Sorry the T-con didn't work.

[Mr Bill]

Re: LG 47LH30 Horizontal Lines in screen

Sorry the T-con didn't work.

Don't worry about it tom. The symptoms pointed towards the t-con board.

I'm exchanging the t-con board for another just for giggles to see if the replacement board was bad. I did change most of the caps with some caps i had lying around, although the caps i had are a junk brand also. The picture did improve, so i ordered the 8 panasonic fm caps from digikey to recap the entire power board. I'll keep you posted on the situation.

[lukep]

Re: LG 47LH30 Horizontal Lines in screen

check the voltage first, but with LG and this problem - panel is wrong in this case