LG DU-42PX12X/12XC colour issue

[cmcltd]

I have an older LG DU-42PX12X/12XC.
Yeah, I know, pony up and buy a newer model. But I have had this one for awhile, and don't want to spend the $$ unless I have to.
I think, based on previous posts, that my problem could be those pesky solder joints on the coils, but wanted a little reassurance before I pull this thing off the wall and open her up.
Problem: Color "posterizing", as it's been referred to on this forum. No other problems, and it has just started getting noticablly worse in the last 3 days. Not unbearable, but still like "paint by numbers" color.
Am I right about the coils?

[tom66]

Re: LG DU-42PX12X/12XC colour issue

I split your post off as it's an entirely different TV.

Most likely, the fault is not the coils -- it's more likely an issue with the voltages, or panel maldischarge which requires a firmware update to the control board.

Pictures of the fault would help a lot.

[cmcltd]

Re: LG DU-42PX12X/12XC colour issue

Per your instructions, please see the photoa attached




I hope I did this properly.
The one photo with the fine lines is not as true as the other. The fine lines are a result of taking the photo off an operating display. My problem is the war the color doesn't "smooth" and looks loke a poster.

[cmcltd]

Re: LG DU-42PX12X/12XC colour issue

Does anyone have any idea on my problem after seeing the photos?

[mmartell]

Re: LG DU-42PX12X/12XC colour issue

As tom said you need to take the back off and take some voltages to see if they are in spec as printed on a sticker on the panel itself.

[cmcltd]

Re: LG DU-42PX12X/12XC colour issue

Thanks.
A little new to this. I did replace the one main board about 3 yrs ago, so I am no novice, I just haven't done test points on this one yet. I have the equipment though.
My main question would really be, is a voltage adjustment (if there is any) going to take care of the problem? or another board replacement? I don't want to go through a bunch of things, and just end up needing a new TV
Any thoughts?

[mmartell]

Re: LG DU-42PX12X/12XC colour issue

Check the voltages then run the internal test patterns. I don't think this is a panel fault if that's what you're asking.