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

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Convergence Issue 4 JVC AV-54WP74

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

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  • 543482 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?

  • 543482 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?

  • CVance 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.

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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

Posted on Mar 29, 2008

  • William Rayburn
    William Rayburn 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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I just replaced the convergence board on my JVC AV-56WP74, but the red still won't line up. Are there other parts that should be changed?


you also need to check and replace low value resistors in that circiut.they are all 1 watt,usually they get discolored when stressed.R842 2.2 ohm,R854 and R846 1.5 ohm,R850 2.2 ohm,R858 3.3 ohm,R862 1.8 ohm.they must be the exact value available in MD from surburban electronics.please note stk392-110 upgrade to stk392-150 for future referance.ONCE AGAIN CHECK ALL LOW VALUE RESISTORS

Sep 18, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

I have a jvc av48wp30 tv and need a wire diagram


Looking the convergence board from the side of the resistors (The chips will be behind the resistors), you have from de left to right:

1.5 ohms, 150ohms, 220ohms, 2.2ohms, 3.3 ohms, 220ohms, 1.8ohms, 220ohms, 150ohms, 150ohms, 1.5ohms, and dispose horizontal in relation of the other resistors (the one near to the Ic is 2.2ohms and the other is 220ohms).

Hope this helps...

Feb 02, 2009 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC AV-56WP74 Convergence part #'s


(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/

Aug 18, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

JVC MODEL AV-48WP74


Convergence Issues Both STK392-110 ICs and possibly the 1.8 ohm and 1.5 ohm 1 watt convergence resistors as well. You can get replacement parts at the following link and they provide free instalation instructions
http://servicemanuals.vstore.ca/

Jun 20, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Jvc av48wp74 horizontal convergence unadjustable after after repair


you have to lift one side of the resistor from circuit in order to measure resistance otherwise a open resistor will not read open as you will be reading the resistance from the surrounding circuit. Always lift one side of a resistor out of circuit when testing with a ohms meter.

Jun 06, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC AV-48WP34 convergence issue


Chances are there are other resistors open

Jun 01, 2008 | JVC AV-48WP30 48" 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

Jvc av-48wp30 convergence problem


1. if the 1.5 ohm resistor was open, then you may have fried your new convergence ic's. Sorry
2. bettween a 1.5 - 1.9 ohm resistor will work
3. press sleep button, set to 30
hold down video status button and press display on remote
select convergence from the new menu and hit OK.
Do fix the convergence before you try to align the convergence or it will look horrible after you get the circuit fixed and will be harder to align.

The white button is there because the DCU (digital convergence unit) can be erased by holding that button and turning the set on.
I WOULD NOT RECOMEND THAT AT ALL!!!!!!!!!!!

Hope this Helps.

Mar 16, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Changed the ICs but bad resistor


jonze,
I don't have a schematic here so I'm shooting entirely from memory... the 850 series position tells me you're in the convergence circuit and I would guess you're replacing some of the yoke return resistors.. Are there any color bandings on that resistor? How about compare it to R846 which I know is a yoke return resistor (it's a 1.5 ohm / 2w) and does it look about the same?
Now I'm going to be really pushy - - - the heading here says you changed the ICs and I would assume you're referring to the convergence Ics? Both are a STK392-110 factory, what did you change them to and where did you get them?? Reason I ask is that there are a lot of chineese knock-offs out there and they won't last sometimes past pressing the power button. And usually with these units I upgrade to a higher amp Ic for greater reliability like a STK392-150 or 180... In addition take a dmm or annalog ohm meter and test all the low ohm resistors in that youke return. A resistor doesn't have to look burned to have changed in value...
Where do you get them... Try Acme Enterprises in Florida.. They have quality Sanyo original Ics and prices are cheaper than anywhere else you'll find in the US... http://www.acme-sales.net/index.shtml
Have a great day and good luck on your repair!
Bill

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

1 Answer

JVC AV-56WP74 projection TV green sagging and can not be adjusted out.


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

Nov 06, 2007 | JVC AV-56WP74 56" Rear Projection...

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