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Need Schematic for Sharp 21v-u63 CRT tv

 
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berniedd



Joined: 13 Dec 2006
Posts: 4

PostPosted: Wed Dec 13, 2006 5:30 pm    Post subject: Need Schematic for Sharp 21v-u63 CRT tv Reply with quote

Hi guys. I need a schematic for Sharp 21V-U63. It showed vertical sweep collapse (horizontal line only) and shortly became dead. I've already replaced the shorted HOT and also the Vert output IC. Flyback tested OK on a FBT tester (even good HV spark). I've also replaced the Chopper IC on the main power supply board, but still the set emits a high pitched soft whine from the power supply PCB. Components in and around the horiz and vert sweep circuits are OK. So are those on the main power supply board. Thanks in advance.
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berniedd



Joined: 13 Dec 2006
Posts: 4

PostPosted: Sat Dec 16, 2006 2:33 pm    Post subject: Reply with quote

addendum: Found other problems in the power supply board- shorted power zener R2KN, bad error voltage amplifier SE120. I just don't understand how these things fail from the original bad vertical output IC which caused the HOT to overheat since the IC gets its B+ from the flyback. Just a fluke maybe?
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