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

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Jvc av-56wp74 power up failure

Sitting here watching tv and a click-pop-fizz sound comes from behind the tv.  Now power light blinks on with no picture or sound.  After removing the back plate and listening it sounds like it is coming from a little black box (fuse maybe) on the right hand circut board towards the back.  I cannot simply remove this box as it appears to be soldered in place.  A few minutes after putting the backing plate back on and applying power the tv power light came on but nothing else is happening.  So as of now  have a power light steady on and non-responsive to any inputs

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Re: jvc av-56wp74 power up failure

Hello hwkdoc,


What has happened is that your shutdown circuit relay has tripped and it looks like it also may have malfunctioned. This however is not the cause of your problem but a symptom. The cause of your problem is an over-current condition caused by one of the systems in your TV, I would suspect the high voltage power supply or the switching low voltage power supply. These are the first places to look, if they are not the problem then check the convergence correction amplifiers. Right now the shutdown circuit is keeping the TV from coming on. If you do not have a background in electronics I would advise you to have a qualified TV technician analyze and repair your TV.


Thank you,



Posted on Oct 15, 2007

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It is worth getting an estimate. From the symptom you explained, it looks like the horizontal output transistor became defective.

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Your description does not tell me very much---You have a JVC AV-56WP74 and it does not work?

If the power light up front which is usually blue in color just blinks I can tell you a easy way to know exactly what is causing this problem.

If when you turn the set on the blue power light just blinks---that is short protection--most of the time a fairly cheap fix----LET ME KNOW WHAT YOU ACTUALLY HAVE GOING ON.

I am here to help---I do this here for free.

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1 Answer

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I can tell you in a easy way how to prove this without replacing any part--

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I am here to help--


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1 Answer

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1 Answer

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1 Answer

Tv comes on then goes black power light blinks on and off modle # JVC AV-56WP74 56

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Dec 20, 2007 | JVC AV-56WP74 56" Rear Projection...

3 Answers


sounds like a power supply7 problem such as a power regulator is bad or maybe the Horizonbtal deflection cu8rcuity is defective. sounds like something if you ask me? should be taken care of by the pros??? Im sorry not being able to assist you better but these sets have hundreds of volts nin them and shoulnt be played with by an unauthoized service company.. Good Luck

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