42lg30-ua lcd right hand dark shadow

[KG7AMV]

I have 2 42lg30-ua's purchased at the same time on About December 2007/2008 about equal run time on both sets..

On the right upper corner on both sets I have a dark shadow now one is slowly getting darker around the edges on the bottom? The other is just barley noticeable.

During normal t.v. play with colors it is barley noticeable but on white look out it is awful.

I am thinking it may be the inverter board or caps in power supply but have not opened up the TV. Does anyone have a parts list of the caps in the power supply would like to just replace them as read that it is a common failure in this set.

I was Also told the ccfl bulbs could be bad but I am unable to locate for this set.

Photo Attached.

[tom66]

Re: 42lg30-ua lcd right hand dark shadow

Unfortunately this is a problem with the LCD panel -- the backlight layers are discolouring. It is possible to fix it, but you have to disassemble the LCD panel completely. As far as I know it's more common with Chi-Mei and Chungwha LCD panels, which LG used in some of their sets. (They use LG Display panels, i.e. their own, in their better sets.)

[KG7AMV]

Re: 42lg30-ua lcd right hand dark shadow

Thanks, Disassembling will not be a problem.. Just have to see if it is worth the money to replace the CCFL's if I am going to replace them I want to replace them all. Wonder if they could be dirty? or just failing...

[tom66]

Re: 42lg30-ua lcd right hand dark shadow

Not the CCFLs. It's the backlight film layers.

[kevinm34232]

Re: 42lg30-ua lcd right hand dark shadow

I had this TV with 4 bad CCFL's and it killed the slave inverter board. I replaced the bulbs from another 42" set with a broken panel, just had to solder the new ones in. The bad ones did have dark spots on them, but your problem looks different. As Tom says could be those layers..

[KG7AMV]

Re: 42lg30-ua lcd right hand dark shadow

I will have to research the backlight film layers you have any reading material you can point me to? Or should I just replace the sets and use them for 50BMG target practice

[tom66]

Re: 42lg30-ua lcd right hand dark shadow

I had a similar issue, and I just washed the layers and left them to dry for a few days.
Whatever you do, please don't break them, that would be a waste. They are usable, so donate them to a charity or sell them.

[KG7AMV]

Re: 42lg30-ua lcd right hand dark shadow

Are there any tutorials for removing the film layers?

[tom66]

Re: 42lg30-ua lcd right hand dark shadow

You have to disassemble the LCD to the point that can access the panel ribbons, then remove the LCD panel itself (be very, very careful not to damage it, it is about 3mm thick), put the LCD on a soft, clean suface (marks here will appear on the screen so keep it clean), then access the film layers.

I wish I made a video of it last time I did this, it's quite an involved job, but it does pay off.

[KG7AMV]

Re: 42lg30-ua lcd right hand dark shadow

Yea, Sounds like I am just going to replace both tv's when finances allow.

Thanks for the help..