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

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Bowed flickering green screen, black on bottom

I have a JVC AV-48WP30 48 in projection television, about 8 months ago the upper left and lower right hand corners were separating. The upper left corner was more red and the lower corner was more green. There were some shadowy lines running through the screen at the top as well. I ignored it and today when I turned it on, the screen was a flickering mess, it was bright green on the top and black on the bottom. The green looks like part of a circle. I am not sure if this is something I can repair myself, or if it is worth it. If I can repair it myself (I am very handy with solding and other stuff) what parts should I replace and what part numbers are they?

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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....

  • 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.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

Bowed flickering green screen, black on bottom - 42d3683.jpg

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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 itBowed flickering green screen, black on bottom - 69189a5.pngix 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.

Posted on Jun 06, 2010

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You can get it repaired. Its maybe a resistor/s thats losing its value and needs to be replaced.
You can locate this on the mother board close to the or near to the Fly-back transformer section.
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With the bow in it it's likely the convergence has failed... Where did you purchase the amps that you put in it? Did you use a good heat sink grease to mount them?? Did you really scrutinize the resistors in the feed and return circuits???
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Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.
Here is an example video


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While it is true JVC tubes rarely fail, they can give trouble.
Another possible solution is bad screen / focus block......
Remove lower front grill panel and access board...Check for
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