Question about JVC AV-48WP74 48" Rear Projection HDTV-Ready Television

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White lines through the picture

Two years ago we had the convergence chips replaced, now our televison is startingto have white lines through it, any suggestions

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They might be going again have you tried auto focus
and adjusting convergence on the menu?
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Posted on Jan 18, 2008

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1 Answer

Yellow and blue shadowing, double image


It a 100% convergence problems.Convergence problems very easy diagnose.The picture look like 3D,colors lines don't lines up.Fuzzy,out of focus.Convergence controls don't work to lines up any colors cross.
WS-55511 uses a single convergence IC chip---a STK-393-110.
IF convergence is off and will not adjust it needs along with any of the 3.9 ohm resistors that protect it to be replaced.
What happens in these and most projection sets is the chip is mounted on a large metal heat sink with fins to keep it cool----a white grease is applied to the back of the chip to quickly transfer heat--after some years the grease dries out from the heat and the chip fails.
Considering you can buy the IC on Ebay for about 14 dollars plus shipping (I can tell you the best seller there to look for) if you or someone you know can do the repair you can save the set and a LOT of money.
Most shops are going to get 200-300 for this repair

Dec 12, 2010 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

55p9363h/17 The picture has bright spots throughout it and it's not very clear. I cleaned the bulbs and the mirror inside. The screen was replaced also. I went through the contrast settings too. None of...


Do a static convergence on your set. You should be able to go into the main menu and scroll down to picture and press select. Then go to convergence and press select. A white cross will appear use on screen direction to line up all the colour crosses behind thie white cross untill they all appear white. Then press continue and you will see several white crosses do the same for each one of these crosses. this should solve your problem. If not u have some bad convergence chips

Aug 08, 2010 | Philips 55PW9363 55" Rear Projection...

1 Answer

The color is off and the figures are outlined in blue and yellow, plus the picture is cloudy looking.


Press menu on your set scroll down to where it says picture then press select. Now scroll down to convergence and press select. A white cross should appear on your screen. Your objective is to merge or converge all the crosses into the one white cross. If done right you should see only the white cross. You may see a little green and blue but don't be to picky. Make sure you read the on screen instructions on how to do this. After this you continue to the next step and you should see several white crosses across your screen. Do a convergence for each one of these crosses. Your picture should brighten up and your yellow and blue lines should go away. If it doesnt you have a bad convergence chip or some bad capacitors. If the first step doesn't fix it I would that you had a tech come and check it out.

Aug 05, 2010 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

The left side of the picture has red and green stripes and ghost images. The right side does not have this problem, but the picture is not quite right. The convergence chips were replaced two years ago and...


That sounds like the convergence problem I had about a year ago, and like you, I replaced the convergence chips and that fixed the problem. It's cheaper to replace the chips if you do it yourself, but maybe not if you send it out for repair. If you can find an exact replacement board, that would fix it too, but I wouldn't necessarily expect it to last longer. The advice I read on replacing the convergence chips in my rear projection TV was that they would last 2 or 3 years and then need replacing again. So you're within that range.

Feb 27, 2010 | Sony KP-51WS500 51" Rear Projection...

1 Answer

White halo around lettering


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.

Feb 24, 2009 | Philips 55PW9363 55" Rear Projection...

1 Answer

Soft white light on screen when screen should be black


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.

Feb 17, 2009 | Philips 60PP9352 60" Rear Projection...

1 Answer

Picture Problems: Snow, color, lines


The most likely cause is shorted convergence chips and possibly a few pico fuses.

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,Pioneer2_bing.gif Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

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

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*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

You can see some more examples and find a fix herebb0cf99.png http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Sep 23, 2008 | Sony KP-53XBR200 53" Rear Projection...

1 Answer

Convergence issues


Drifty convergence IC's need replacing..located on center PC board......STK392-570...change them both for reliability...T.

Feb 28, 2008 | Mitsubishi WS-65809 65" Rear Projection...

2 Answers

Hitachi 65SWX20B 65 in. Rear... Problem


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.
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.

Jan 15, 2008 | Hitachi 65SWX20B 65" Rear Projection...

1 Answer

Lines on tv


Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback lines, frame ok. I detected two badly soldered double diode rectifiers in the secondary part of the power supply ! I checked all other joints, and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok

Nov 23, 2007 | Mitsubishi WS-65511 65" Rear Projection...

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