White screen on tft monitor

Bart: The problem would seem to located in the controller board. Many of these are multi-layer boards. I have had some luck with resoldering the whole board, even the solder-thru holes where possible. Must have been an inter-layer break.

Some of the older LCD's used a lot of surface mounted electrolytic capacitors, which were always going high ESR. I could not get the manufacturer to sell me any of these boards. Good luck.. John

I have a flat panel monitor with a similar problem, and I shall take your advice. Do you by any chance know what signals are going to the display panel from the logic board via the cable on such monitors? I put a scope on the leads and I can see data such as would be on the cathode of a CRT monitor, and what appears to be a vertical signal. I am curious as to how they control the horizontal and vertical scan of the flat panel monitor. I would assume that several of the leads are digital and select the horizontal position??

Ken

On Fri, 30 Jun 2006 12:07:56 GMT, Ken put finger to keyboard and composed:

AFAICT, all the signals are digital. I believe the interface standards used in most panels are TMDS and LVDS.

This old post contains links to specs and tech notes:

- Franc Zabkar

On Sat, 01 Jul 2006 12:09:39 GMT, Ken put finger to keyboard and composed:

FWIW, there is a Samsung SyncMaster 770TFT service manual, with circuit diagrams and setup procedures, at Datasheetarchive.com.

It may help you understand the general principles.

- Franc Zabkar