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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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