42LG32000 - Contrast problem, holografic traces, pulsating picture

[zgchipo]

Hey everybody.

I got an malfunctioning 42LG3000.

It has weird colors like too much contrast, and is hard to get the right skin collor. It is either too red-ish or too yellow-ish.

Also the picture has traces of menus or logos of tv company that is in same place when i switch programs.

And now started pulsating every 5 seconds. It pulsates the blacks to almost inverted looking picture.

I tryed with connectors, but they seem ok. Im not a electronics expert so i looked for mechanical issues.

No blown capacitors, no black spots, no blown ICs and no cold soldering.

I tryed everything that crossed my mind even taping and hitting each end every thing on the boards.

Please help.

[tom66]

Re: 42LG32000 - Contrast problem, holografic traces, pulsating picture

Most likely bad panel / bad tab bonds. If it uses Chi-Mei panel VERY likely.
https://www.youtube.com/watch?v=xHst6pKLtTE

[zgchipo]

Re: 42LG32000 - Contrast problem, holografic traces, pulsating picture

Thank you for the fast reply, but do you have any other suggestions that i can try,

I`m no electronics expert but however i`m good with soldering iron but i need to know what and where to check with an multimeter.

If i put pictures can you tell me where to put which probe, and what should i see.

[tom66]

Re: 42LG32000 - Contrast problem, holografic traces, pulsating picture

This is not something testing with a multimeter can usually fix. Try -very gently- twisting the frame of the TV. If the picture comes back, it is a tab bond issue...