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

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Converge problem how to fix JVC AV56wp74

I have a JVC 56" Wide screen Model # AV-56WP74 and i have a converge problem with the red doubling on screen i have read about people replacing the IC and fixing the problem now my question is can someone tell me where the ic board is located and which chips to remove and possible a step by step instructions would help also i was thinking of just ordering the converge board and transplant the big silver thing can someone help me on what chips to buy and where and how to go about installing them thanks im in need of my big screen back nascar isnt the same anymore on a 13''

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  • SAC 8 Nov 26, 2007

    The board comes out fairly easy, my questions:



    Are those the only two things that need to be replaced?



    They both have the same part number "STK392-110" the only different number I could find was B2L13 on one and B2L30 on the other?



    Where is the best place to orders these parts?



    Other than those questions, the instructions you provided were great

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There are two of the IC's in the tv. First things first, turn the tv off and unplug it. Wait a few minutes, then open up the back by unscrewing the screws in the back panel. Now slide out the wooden panel that divides the upper and lower part of the cabinet. You'll see some cards sticking out of the plastic input panel. Find the one for DVI (it's the furthest to the right and it's at the top). Unplug all of the cables that are attached to this board. If you look closely, on the top of this board (the edge facing the top of the tv) there is a tiny little square looking hole on it. Cover this with black electrical tape or something that will not allow light in. The reason we do this is because JVC made a booby trap that erases the eeprom if you try and operate the tv with the back off. If the sensor senses light when the tv is on, it will erase the eeprom. Ok well now that that's covered, the actual convergence board (the one with the two IC's) is the board in the very front of the tv. It's long and slim and you'll immediately be able to see the two IC chips. They are big black things with lots of pins and they are pushed up against heatsinks. Those are what you would want to replace. Now I've not taken the boards out before, but from the looks of things, all of the boards are on a big black plastic tray so you can take them all out at once. I don't know if you can get just the convergence board out very easily, but at least now you know where and what it is. I would seek further instruction from someone a bit more knowledgeable about taking the boards out, but that should give you enough to do until you find more help. Hope this helped!

Posted on Aug 15, 2007

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The red is out of line with the green and blue.how do i fix this

Posted on Jul 11, 2008

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So tell me does this just render the dvi inoperative (I saw the note about a jumper on pin 1 to 2 after the fact) or does it actually render the whole tv inoperative? I replaced the stk's on my brother in laws tv and all it does is thump like a heartbeat from the speakers for a couple minutes and then the power light blinks in about a 2 second cycle (Low B if I read the manual right) any thoughts?

Posted on Nov 28, 2007

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1 Answer

My JVC AV-56WP74 is showing green and purple waves at the top of the screen what is defective?


Common problems with the chassis used in this model for complaints such as this are caused by damage in the convergence circuitry (since there are three separate picture tubes, each mounted in a physical location different from the others, the light each tube "throws" on the screen falls in a different physical location on the screen; the electronics of the convergence circutry force the red & blue light information to "converge" on the image produced by the green tube, which being physically located in the center of the other two is the "master" image), usually associated with the IC's used as amplifiers for the convergence circuits (this model uses STK392-110's) and with the high-wattage, low ohmage resistors used as biasing components for these amps

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1 Answer

IC's


Take the board out through the front inspection hole. No screws holding board. Middle large plug disconnects from chassis, not converge board. All other plugs come off converge board.

If the large plug is a problem, just hang out the front and solder.

Be careful with foil on board, crappy board.

Pacific Semi for ICs.

easyab

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

1 Answer

Red Convergence


all you gotta do is use the manual convergence if only the red is messed up

Jul 27, 2008 | JVC AV-56WP74 56" Rear Projection...

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JVC I'Art AV-56wp74


A repair facility will charge 400 to 600.00 for the repair. Or you can repair it yourself if you can solder. As both convergence ICs need to be replaced. They are STK392-110 you can get replacement ICs at the following link with free instalation instructions with pictures so you can do the repair yourself. Heres the link.
http://servicemanuals.vstore.ca/

Jun 15, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

JVC AV-56WP74 Red Convergence is Off


Sorry,I don't send E-mail instructions......see my powered
products for many convergence repair solutions........T.

Mar 22, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Jvc av56wp74 rear projection tv


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

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

1 Answer

Convergence problem


sounds like convergence amps bad

Oct 23, 2007 | JVC AV-56WP74 56" Rear Projection...

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Jvc model av-56wp74


Needs convergence IC's replaced..........T.

Oct 06, 2007 | JVC AV-27850 27" TV

1 Answer

Double vision On JVC AV-56WP74 56


You have an convergence problem, There are 2 IC's that go bad and a few resisters that can change value. If you flip the board with the Chips inspect the pins for cold solder joints. The IC's can be purchased from matelectronics

Jun 17, 2007 | JVC AV-56WP74 56" Rear Projection...

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