White screen on tft monitor
 

What could cause a fully white screen, backlight on, no video?
general question, have seen this fault many times.

Bart Bervoets

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

White screen on tft monitor
 

White screen on tft monitor
 

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

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

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:
http://groups.google.com/group/alt.c...e=source&hl=en

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

White screen on tft monitor
 

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

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

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:
http://groups.google.com/group/alt.c...e=source&hl=en

- Franc Zabkar

Franc,

Thanks for the links, they will be very useful. I don't know if I will
solve my problem, but at least I have some idea of what is going on.

Ken

White screen on tft monitor
 

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

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

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

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:
http://groups.google.com/group/alt.c...e=source&hl=en

- Franc Zabkar

Franc,

Thanks for the links, they will be very useful. I don't know if I will
solve my problem, but at least I have some idea of what is going on.

Ken

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

http://www.datasheetarchive.com/data...rticle=3725491

It may help you understand the general principles.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.