Sony KV 35S26 -- Audio but no raster

[lurknowhere]

How about a Sony KV 35S26 that when switched on comes up with audio but no
raster -- black screen. In the beginning it would take only a few minutes
before the video would appear. As time passed the problem worsened, it
would take 45 minutes or longer. Finally, the owner just left the set on
all the time to avoid the waiting period. Then it started to suddenly go
dark and stay totally dark, with sound. That's when he called me.

This is a big heavy set and I'm not really in the business now to bring it
home with me. I know some of the intermittent PS solder connection problems
from my past work on Sonys, but have little experience with this model and
it's common failures/symptoms. Any known clues would be appreciated from
those still working or playing the field fulltime. Thanx.


-Dan

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[Sofie]

Dan / lurknowhere:
Possibly bad or weak crt...... this is may be why the problem got worse
gradually over time, as the crt progressively got weaker or developed
shorts.

 

[Gary W.]

Toasted CRT.

Gary W.

 

[David]

Do a Goggle groups search for Sony AKB Video Blanking and this is a
common question. On that model, with your symptom of it getting
longer over time, I would bet that the picture tube is the cause of
the failure and the permanent proper fix is to replace the picture
tube. Slightly turning up the G2 voltage might buy some time to keep
a picture on the set, but honestly, by the time the Sony tubes do this
they will not track gray scale very well at all.

David

 

[Tom MacIntyre]

How about a Sony KV 35S26 that when switched on comes up with audio but no
raster -- black screen. In the beginning it would take only a few minutes
before the video would appear. As time passed the problem worsened, it
would take 45 minutes or longer. Finally, the owner just left the set on
all the time to avoid the waiting period. Then it started to suddenly go
dark and stay totally dark, with sound. That's when he called me.

This is a big heavy set and I'm not really in the business now to bring it
home with me. I know some of the intermittent PS solder connection problems
from my past work on Sonys, but have little experience with this model and
it's common failures/symptoms. Any known clues would be appreciated from
those still working or playing the field fulltime. Thanx.


-Dan

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Probably a bad CRT...sometimes buzzing the CRT with a rejuvenation
cycle or 2 will help, but it's something that'll have to be done every
few months, and very gently each time.

Tom

 

[lurknowhere]

Probably a bad CRT...sometimes buzzing the CRT with a rejuvenation
cycle or 2 will help, but it's something that'll have to be done every
few months, and very gently each time.

Tom

I've since discovered that this set had some work done on it a few years
back. An isolation torroid was installed to lift the ground on a heater to
cathode short. Apparently, it fixed that problem, but I'm suspecting the
CRT has developed another short. A rejuvenation attempt might work, as a
last resort.

-Dan