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Default Hitachi part-HC-3041 AP43 chassis

Already changed all the caps, picture has elevated pedestal
(brightness) and won't sync. The amplitude at the YSY output is very
low in amplitude, and the set syncs once in a while on a bright scene.
There is also some horizontal bending, and during a blackout between
scenes it actuall loses H sync as well.

I spied the pattern for the plug for a two line comb filter so I
decided to put one in from "stock". There was no sync at all, I found
the YSY terminal is not used in a two line equipped set, so I took a
10uF cap and coupled the Y output to it, and then I got clean Hsync,
but seemingly no V sync at all. Yall know the architecture of the video
circuit has become a rat's nest, with the two line filter installed
there was no sync from the SVHS input either ! This even though with
the original there was.

When using SVHS the elevated pedestal is also gone. Picture perfect
(except for a minor lack of NS pin correction). Trying to think the set
only has one problem, I unplugged the covergence WF board and it didn't
clear up the sync problem. Also video response is good, there are no
trailing negatives typical of video distorted by bad caps.

The set also KNOWS when it has sync, with no sync the OSD goes into
default values and is centered, when it has active video (rolling) the
OSD is shifted up, like it used to in sets without a default no signal
sync.

If you got any ideas, great, but I'm starting to think it's time to
replace the comb filter.

Anything is appreciated, and I'll buy one from you if you got one for
sale.

Thanks in advance.

JURB

 
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