Hello,

I have a 16-year old SONY KV-X2531D (AE1C-Chassis) set which has been
repaired several
times already but still doing tough so far. Now it has started to drop
green-color
intermittantly meaning that it comes back after certain circumstances. I
have made
the following observations/measurements so far:

Green drops in normal reception-mode giving the picture a red tint but
picture visible, turning set
into StandBy and turning it on again will sometimes bring the green back but
mostly screen will just remain black (slight raster visible though). What
really
puzzles me is that activating videotext works (i.e. I get the text-picture)
with green-color missing. But normal reception or OSD (green) does not show
up
(I'd expect the video also to appear with green missing, but video is just
black
and videotext with green missing). I cannot influence the color-dropping
mechanically
which would probably unveal dry solder joints.

Anyway, I checked the voltages on the CRT-neck board:

- 12V from video-board is okay
- R,G,B from video-board measure around 12V AC
- R,G,B directly on CRT-neck measure 280 (R), 350 (B), 480(G) AC-V

So has anyone any suggestions ? I suppose this must originate somewhere on
the video-board, since all video generated by the set itself works (except
for green missing thus no OSD/videotext with no green) but external sources
(tuner/AV) do not.


Best Regards,

Adrian