Question about JVC AV-48WP74 48" Rear Projection HDTV-Ready Television
Screen has bowing at top of pic. sides are slanted like a theater effect,station i.d colours or inmage not converging
Chances are that IC804 has failed. You have two ICs that allow you to
converge the three colors. IC804 is used for Red Horizontal and
Vertical Convergence and also for Green Vertical Convergence. IC805 is
used for Blue Horizontal and Vertical Convergence and also for Green
Horizontal Convergence. These ICs run very hot and have a very high
failure rate which sometimes will cause damage to resistors in their
associated circuits. They are both STK-110 and it's best to replace
them both at the same time. It's also a good idea to upgrade them to
either STK-150 or STK-180. These will run a lot cooler than the
Before replacement do inspect for any open or overheated resistors as I stated earlier. Being you only have problems with Red Convergence the plus and minus power supplies should be okay since they are common to both ICs.
Try www.tritronicsinc.com. They have the Hitachi CZ00433 (STK392-150) in stock for $20.11 ($32.43 retail). These are Hitachi OEMs. I've had very good results replacing STK392-110s with these chips. Do check for open or overheated resistors before replacing these chips
Posted on Dec 29, 2007
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Posted on Jan 02, 2017
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