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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You will need to replace the Convergence ICs and resistors you can get the JVC repair kit called the AV48WP74-65WP74 convergence repair kit from www.tvrepairworld.com which contains the ICs , resistors and the CD with instructions,

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Hi, convergence amps have failed, your going to need a tech for that repair, involves un--soldering and re-installing parts as well as an alignment, hope this helps, video-tek

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you can get your manual here http://www.online-owners-manual.com/av-56wp74-ha-jvc.html

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there are two i.c chiyou have to replace they have to do with the conversion go to electronix.com you can both for 5 a piece plus 5 for shipping and handling so 20 dollars total you have to replace both of them

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Its actually a easy repair but its recommended that the convergence resistors need replacement as well. You can get the parts at the following link and they provide free detailed instructions with pictures. You need two STK392-110 Convergence ICs and you would need the JVC convergence Resistor kit #1 also. Heres the link.
http://servicemanuals.vstore.ca/

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(2) STK392-110 Convergence Amp ICs
(3) 220 ohm 2watt metal film resistors
(3) 150 ohm 2watt metal film resistors
(2) 1.5 ohm 1watt metal resistors
(2) 2.2 ohm 1watt metal film resistors
(1) 1.8 ohm 1watt metal film resistor
(1) 3.3ohm 1watt metal film resistor
You can get the entire convergence repair kit which contains all the parts listed at the following link its called the AV48WP30 Convergence repair kit , but it applies to your model as well, and they include free installation instructions.
http://servicemanuals.vstore.ca/

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http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm

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You don't have to replace the board, just the amps. This set uses two stk392-110 Sanyo built amps. You will also need to test and possibly replace one or more of the 1.5 ohm feed resistors in that circuit.
If you're doing this at component level try Acme in Florida for amps and resistors: 1-800-575-9833 http://www.acme-sales.net/index.shtml and if you're doing this at modular level send it to PTS http://www.ptscorp.com/ 1-800-844-7871
Good luck!
Bill

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1 Answer

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The convergence amps need to be replaced. If you're having a shop do this call around and ask what they charge for repairing the convergence. If you're doing this repair this set uses two stk392-110 Sanyo built amps. You will also need to test and possibly replace one or more of the 1.5 ohm feed resistors in that circuit.
If you're doing this at component level try Acme in Florida for amps and resistors: 1-800-575-9833 http://www.acme-sales.net/index.shtml and if you're doing this at modular level send it to PTS http://www.ptscorp.com/ 1-800-844-7871
Good luck!
Bill

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