Convergence Issue 4 JVC AV-54WP74 (by 2 users)

posted by 543482 on Mar 29, 2008

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You wrote::::: Also check all of the return resistors in that circuit 1.5 ohm 2w and feed resistors 3.3 ohm 1w all are flameproof. You'll likely find that one or more of the return resistors are bad, with suspecting the red is the failed amp check in particular R846 for change in value or open.

Can you give more clear (lay person terms) of exactly what I should do

Comment by 543482, posted on Mar 29, 2008

PREMTECH::::::Your instructions were VERY helpful.

I have already removed the 2ea. STK392-110, and am waiting for the new parts to be delivered. I've looked over the resistors you mentioned and I think R842 seems to have a dark ring around the center of the resistor are there any other outward signs to indicate a resistor is bad? Can these resistors be purchased at a home depot or radio shack or is it a specialty kind of item?

Comment by 543482, posted on Apr 03, 2008

PREMTECH ::: I test and have three bad resistors R846 (2.2) R842 (?) and R862 (?). While I was taking them out I wasn't really paying attention to which one I was taking out of which position. All I know is one of the resistors is 1.8 and the other is 1.5...anybody have an idea of which go where?

I have the same problem.

1 Other User Has The Same Problem

Comment by CVance, posted on Jul 27, 2008

I have the same problem on my JVC of the same model. I replaced the IC's and one bad resistor, a 1.8 ohm. I got everything hookedback up and it worked for about 10 seconds and then smoked the same resistor. I believe the one that keeps blowing is R842 (it is the green that keeps bowing in at the top and bottom). Any ideas of where I should check next? I have some electronic experience.

Best Solution

posted on Mar 29, 2008

premtech

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I was trying to be as clear as possible, sorry. There are several resistors, both in the youke return circuit and feed circuit for the amps that should be checked with a digital or analog meter to see if they have changed in value or have opened as a result of the amp failure. If you've never tested a resistor before then I would strongly suggest having this repair done by a shop. There are several types of resistors, the ones you'll encounter here are a flameproof resistor 1 or 2 watt design respectively.
If you're attempting this you'll need a good analog or preferrably a digital meter with an ohms readout setting. Meter across the resistor and the value of the resistor should not be more than 10% of the rated value. If you read infinity you can assume the resistor is open and clearly should be replaced.
If any of this isn't clear enough then I STRONGLY suggest having a qualified technician do the repair... These are common repairs and if you lack any of the necessary testing or soldering skills you could make matter even worse...
Bill

Comment by premtech, posted on Mar 30, 2008

No other outward signs - - TEST TEST TEST.... You need a meter - no way around it - if you put the new amps in and the resistance value is incorrect say goodbye to two new amps...
Second, no flameproof resistors are not a home depot or radio shack kind of item. Try Acme in Florida http://www.acme-sales.net for the amps and resistors.
Another thing, just a thought, don't buy your amps from just anyone and/or cause they're cheap... If you don't get Sanyo originals you might as well be pushing your money down the toilet.
Bill

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