Question about JVC AV-48WP30 48" Rear Projection Television

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My av48wp34 I have a convergenace problem. I can't move my red convergeance up or down, and I have a green slope at the top and bottom of my screen. I had sound but we took it to a repair place here in town and then he called us the next day to say that the repair is going to cost $450 because the tv has no sound and that he needs to fix that too. We are pretty sure we had sound to the tv wheb we took it to him, but anyways if we can fix it ourselves what would we need to start and finish? Thank you!

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The AV48WP34 is a lightbox PTV and therein could be your problem with the audio. If the box was removed for testing in the convergence it's possible that not all the jumpers are tight. Look at connection between pin 12 of T921 and K935 jumper for your 28v source I've made that mistake in this chassis before.
As to your convergemce problem it's most likely an amp failure. That unit takes two STK392-110 Sanyo amps and both should be replaced. On this unit convergence is easy through the front of the TV grill. The entire module can be removed for replacing the amps making installation a breeze if you're any good at soldering.
I'd recommend Acme for the amps http://www.acme-sales.net that way you won't get some chinnese knock-off... And you might even want to consider upgrading the amps to some STK392-150's (greater amperage) for greater reliability.
Bill

Posted on Mar 31, 2008

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You will need to replace your two convergence I.C.s.They are two large IC mounted on a large aluminum heat sink.Replace both,look for any burned resistors near them,replace those if needed,and readjust your convergence. Good Luck

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Sometimes after the my TV is one for 20 mins or so the screen warps, shooting white/pink/green lights across the top and bottom of the screen and placing a horizontal black line at the bottom like hal


Your TV most likely has a problem in the convergence circuits. ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem


  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
Here are some photos of convergence problems.

3dc9420.jpg
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

0667c5f.pngSOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site www.TvRepairKits.com. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

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You have a convergence problem. i see these set all the time at shop. first consult the article in tips and tricks section the fl231 fuse problem. it might provide some answer and might turn out to be a simple repair. If you do not have the convergence option under setup in customer menu then i say you have that problem.. otherwise it sounds like a convergence power board issue. if you have the options try autocovergence first and then if that fails try manual convergence of red and blue if the dont move then it will be convergence power board. let me know and ill try to talk you through it

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Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
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Here are some photos of convergence problems.

42d3683.jpg

7859b01.jpg

e87380c.jpg
Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

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http://servicemanuals.vstore.ca/

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

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