Troubleshoot SyncMaster T240HD

[Kilted_scot]

I have reviewed the previous posts regarding problems with this monitor, and none seem exactly like mine.

I have a Syncmaster 240HD that is well out of warranty and has started to show some problems.

The monitor will turn on.
At power on the display immediatly shows a bright grey center, with rainbow fringing around the edge.

This fades out after a few seconds.

This does not appear to be the two second to black issue, since I never see the perfect picture or boot logo.
The system still appears to be working since I can here the sound from the channel coming through.
The remote doesn't appear to have any effect.

Monitor is completely disassembled and ready for testing.

Thanks.

[Kilted_scot]

Re: Troubleshoot SyncMaster T240HD

For the heck of it I thought I would try testing the power from the main board.

Here are my results.

Black to Pin 4

Pin 1 144.5v
Pin 2 15.12V
Pin 3 0
Pin 5 0
Pin 6 5.31V
Pin 7 5.31V
Pin 8 0
Pin 9 00.2mv

[budm]

Re: Troubleshoot SyncMaster T240HD

That looks like failed GAMMA reference voltage failure. That will be on the T-CON board. That white flat ribbon cable at the main board will go to the T-CON board of the LCD panel assembly.

[Kilted_scot]

Re: Troubleshoot SyncMaster T240HD

Forgive my ignorance, but which board is the T-CON.

I am assuming that it is this board. BN41-01010D

Am I mistaken?

Thanks

[budm]

Re: Troubleshoot SyncMaster T240HD

Take the picture of the whole back side of the monitor so I can show you.

[Kilted_scot]

Re: Troubleshoot SyncMaster T240HD

Here ya go.

I have marked the board that I think you are referring to in Red.

Thanks

[budm]

Re: Troubleshoot SyncMaster T240HD

The T-CON board is integrated into the LCD panel assembly, you can see it under that big long metal shield cover on the back of the LCD panel. That will just about impossible to repair. Do you have proper tools for SMD repair? Need to locate the GAMMA ref voltage test points and IC that supplies them.