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

3 Answers

Red lines and shadows, convergence wont work

I tried adjusting convergence, just trying to keep from having to call a repairman as I know it costs.

How can I fix startiing with access to the boards.

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  • Anonymous Mar 28, 2009

    Red shadows and magic focus will not work

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3 Answers

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  • JVC Master
  • 3,459 Answers

Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( 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.
Red lines and shadows, convergence wont work - 701cb04.jpg
77eRed lines and shadows, convergence wont work - f0900cb.jpglass=
f0900cb.jpg
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 convergenRed lines and shadows, convergence wont work - 2c07611.pnge bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg Red lines and shadows, convergence wont work - 2c07611.pngef="http://www.fixya.com/support/t497723-colors_dont_line_up#" >TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Posted on Mar 29, 2009

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  • Master
  • 3,130 Answers

You can go to tvrepairkits.com and get everything you need for this TV including pictorial instructions and if you hit a snag there is free live on-line tech assistance with a kit purchase in case you hit a snag with the repair

Posted on Jun 18, 2009

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  • Expert
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Go in and find the conv ICs, they will be mounted on a big heatsink and the wires going to the conv yokes will most likely plug in somewhere closeby.

Conv ICs are the workhorse of the CRT RPTV, and it is not unusual at all for them to need to be changed out at some time in the life of a CRT RPTV.


Mr Bob

Posted on Feb 04, 2008

  • Robert Jones
    Robert Jones Feb 04, 2008

    PS -
    The wires for the conv yokes at the CRT necks are the thin ones. The thicker ones are for the hor and vert sweeps, which must never be disconnected from their circuitry during
    CRT operation.



    If your beam loses sweep on any of the CRTs, it will instantly score/gouge your phosphors on your CRT faces, vaporizing the phosphors there and ruining the CRTs. The beam is very powerful, but in normal operation moves incredibly fast, not damaging anything. Any slowdown of the movement of the very powerful beam that draws the picture, acts like the searing vaporizing beam in Tom Cruise's War of the Worlds.

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Blue will not focus causing "shadows". Magic focus will not solve the problem.


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Hi, if the shadow is colored lines then you probably need the convergence ICs and possible reisitors near them replaced .
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Red shadow


Projection TV sets have two very common problems listed below.

Problem #1) Convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Do not adjust any knobs as instucted in the previous thread if you TV have a convergence problem. Doing so will only make things worse. The blog does however show you how to fix other common problems with these sets.

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.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
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.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.

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Tim Nolan

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you need to replace both convergence ICs they are STK392-560 and you will also need a couple 3.5amp pico fuses and a couple 4.7 ohm 1/2watt resistors. You can get replacement parts at the following link and they provide free instalation instructions and free online tech support to help you with the instalation process. Heres the link.
http://servicemanuals.vstore.ca/

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Red sideways hourglass


Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( 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.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
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.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

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