Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

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AV-56WP74 My AV-56WP74 has been repaired twice for the same problem under extended warranty - I have no bill/invoice that show me which parts were replaced but I my problem is that when I turn it on, I hear the "heartbeat" sound for several seconds, then nothing. The power light blinks on/off but no picture or sound otherwise. The last repairman told me he replaced with more heat resistant parts and replaced "both" of them - that was 2 years ago and he's no longer in business or has moved. I just spoke with the first repairman who worked on it and he says it could be the power supply overloaded by the IC components but they wouldn't know until they look at it $425 if it's the IC parts plus another $75 for the service call. Please help me diagnose so I can either buy the part or the service manual from servicemanuals. I'm not sure what I need to buy because I'm not sure what is actually causing the problem.

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  • stephanie7 Mar 23, 2009

    Is there a schematic or service manual I can get as well?

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  • JVC Master
  • 3,459 Answers

Could be shorted convergence chips. There are two of them in the TV. If they short they will shut the TV down. One quick test is to desolder both of them...then power the TV on..if it fires up the chips were shorted and would need to be replaced. You can get a complete kit from www.TvRepairKits.com

Posted on Mar 21, 2009

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(2) STK392-110 Convergence Amp ICs
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http://servicemanuals.vstore.ca/

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