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White screen on tft monitor

B

Bart Bervoets

Jan 1, 1970
0
What could cause a fully white screen, backlight on, no video?
general question, have seen this fault many times.

Bart Bervoets
 
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
 
K

Ken

Jan 1, 1970
0
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
 
F

Franc Zabkar

Jan 1, 1970
0
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.comp.hardware.homebuilt/msg/3efaa0062bef0622?dmode=source&hl=en

- Franc Zabkar
 
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