Question about JVC AV-56WP30 56" Rear Projection Television
It sounds to me also as though the convergence amps are out. That unit has two STK392-110 IC's which are multi-pin IC's and not something the ordinary laymen should consider replacing for several reasons - more on that thought later...
The convergence circuit for that system is in the 800 location numbers on the board. IC804 and IC805 are your amps. They're mounted to an aluminum heat sink via screws and are backed with heat sink compound for added heat dissipation. You would also need to check all the feed resistors to those IC's for change in value. I have RARELY changed out the convergence amps and not found at least one of the feed resistors had changed in value. In that unit they're 2.2 ohm 2 watt.
Another insider tech advisement is to replace the present amps with STK392-150's instead of the 110's for greater reliabilty. They do cost a bit more, but are well worth the investment.
Lastly, can you so this yourself... If you're the kind of guy that could remove your appendix yourself with simple phone instructions from a doctor this will be a breeze. If not, get a professional. Not only can you ruin the amps putting them, heat damage, line-up or simple static blow out - after the job you'll need to do a complete convergence and may need to touch-up the parameters in the service menu (not a customer menu). And it relies on hex-decimal input. In short, you would be a penny wise but a pound foolish to do this yourself.
Posted on Nov 10, 2007
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