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

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Just a resistor?

I have a bad resistor on my JVC unit. If this is bad do I also need to change out the STK392-110(s)? The resistor which is bad is R842.

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R842 is off of pin 18 of IC804 which controls the red convrgence yoke. I would recomend changing both STK392-110 Ics as well as checking the other resistors R842 is a 2.2 ohm 1 watt metal film resistor. let me know if you need more assistance.

Posted on Jun 07, 2008

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It's recommended to replace all the defective parts first because if you only replace the defective resistor, it might burnt again if the convergence IC is shorted internally. I would also suggest to measure the other low value resistors with multimeter.

Oct 30, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

I have a JVC AV-56WP74 Rear Projection HDTV Ready Television...I had a problem with the convergence with dual pictures on screen...I replaced the convergence card with 110's.....This fixed the screen...


The STK392-110 are the stock ICs for your JVC. Chances are one or more of the feed resistors are bad. JVC TVs will usually have at least one bad resistor when the original ICs fail

Sep 06, 2009 | JVC AV-56WP74 56" Rear Projection...

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Convergence Issue 4 JVC AV-54WP74


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...
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Mar 29, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Red Wavy lines running across the screen...


Yes - - that indicates one of your convergence amps have failed. That unit takes two STK392-110 Sanyo amps which I personally would replace with STK392-150's for greater reliability. 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.
Bill

Mar 24, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Blue light flashes


it is most likely the convergence panel. do your speakers make a thumping sound? if not, disregard this solution. change the stk392-110 convergence amps located behind the front cover on the convergence board. also check the resistors, it seems like they always take out two or more resistors. make sure all of your solder connections are good and none of them are touching. also, when you get the set back on you will need to manually adjust the convergence from the menu. you will need the factory remote. if you find bad resistors, the values are on them, but if you need the values and wattage, then use this page:

http://home.comcast.net/~dande76530/ConvergenceOutSchematiics.pdf

hope this helps you.

Feb 11, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Bad Resistor


Jonze,
Guess I should have looked to see that you had a second post. I justa answered one and here's some of the answers to my questions..
Brown - green - grey - gold would be a 1500m resistor and I would HIGHLY doubt they used something that intolerent in the convergence circuit... It's more likely to be a 1.5 ohm resistor which is brown - green - gold - gold and the grey you're looking at my just be discolored from heat stress...
Take a look at my previous post and tell me what you find after you make some comparisons.
Bill

Dec 09, 2007 | JVC AV-56WP74 56" Rear Projection...

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