lg 32lg3000 white screen faint picture

[tom66]

Re: lg 32lg3000 white screen faint picture

I know on some of these LCDs there is a potentiometer (little adjustment) which can sometimes cure this. It's usually visible through the metal frame. Any signs of one?

[flocko]

Re: lg 32lg3000 white screen faint picture

not that i can see, You said about the 5v supply from the main board, That must be on the socket at the top as that is the only link i will see if it is marked up as my photo does not show it

[flocko]

Re: lg 32lg3000 white screen faint picture

photo main av board to t-con socket view from the top you can see the bottom in the other photo anything i can check here

[tom66]

Re: lg 32lg3000 white screen faint picture

Nothing on top of frame of TV?
What is model # of panel? (on sticker which says LG Philips LCD - Made in Korea etc.)

[flocko]

Re: lg 32lg3000 white screen faint picture

Lg32owxn(sa) (a2)

[tom66]

Re: lg 32lg3000 white screen faint picture

No luck getting a datasheet.

It may be panel failure, the T-con has been ruled out.

See this video -- tab bonds maybe.
https://www.youtube.com/watch?v=xHst6pKLtTE

[flocko]

Re: lg 32lg3000 white screen faint picture

had the panel out all ribbons on ok all back now still the same, so does having 12v at the t-con fuse rule out the main av board and the t-con board ,the puffy caps on the av they would not be a problem then any thing else i can try thanks for you help with this

[tom66]

Re: lg 32lg3000 white screen faint picture

The AV board is unlikely to cause the distortion shown.

The T-con is the main suspect, but you replaced it. It is possible you got a faulty part. Can you exchange it for another?

[flocko]

Re: lg 32lg3000 white screen faint picture

it was the same with old board so i think the problem must be elsewhere,I forgot to say the av board has a red led that is on all the time would you know if this is wright or not,

[tom66]

Re: lg 32lg3000 white screen faint picture

The LED might be a power indicator.

I would try and exchange the t-con just to be sure. I cannot think of another board which could cause this fault, other than the LCD itself.

[flocko]

Re: lg 32lg3000 white screen faint picture

I thought the t-con decoded the information from the av board to the lcd panel

[tom66]

Re: lg 32lg3000 white screen faint picture

It also provides the drive voltages to control the pixels: +15V, +25V and -8V typically.

[flocko]

Re: lg 32lg3000 white screen faint picture

were do these drive voltages come from if there is only a 12v supply to the t-con board

[tom66]

Re: lg 32lg3000 white screen faint picture

They are generated on the T-con board.

[flocko]

Re: lg 32lg3000 white screen faint picture

Hi Tom thanks for sticking with me on this i have been reading though the posts for the dynex DX-LCD32-09 that has the same type of problem, he also has changed the t-con with no luck but what i did find interesting was the post made by momaka to check the caps near the voltage regulators on the video/logic board as i have bad looking caps in this part of the board do you think i need to change them.

[tom66]

Re: lg 32lg3000 white screen faint picture

Anything's possible now. Check all the regulators on the main board. If it is the main board, I will be very surprised, but it could be I guess.

[flocko]

Re: lg 32lg3000 white screen faint picture

Thanks Tom I know i have read how to test the regulators on some post and what the reading need to be but i dont seem to be able to find it give me a clue.

[tom66]

Re: lg 32lg3000 white screen faint picture

Just list the readings along with the part # and we can tell you if they are OK.

[flocko]

Re: lg 32lg3000 white screen faint picture

voltages for regulators taken with reference to pin 2 ic1105 pin 1 3.2v pin 3 1.8v ic1102 p 1 2.4v p 3 2.0v ic1106 p 1 2.4v p 3 1.7v ic1107 p 1 2.4v p 3 2.5v ic1108 p 1 1.7v p 3 1.4v

[selldoor]

Re: lg 32lg3000 white screen faint picture

Not sure you have the right method there - read this

https://www.badcaps.net/forum/showthread.php?p=261329