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

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My red is out of focus

This morning, the tv came on and the red was out of focus. I went to the manual and tried the convergence tips, but the red will not fully adjust. I can move it side to side in the middle, but the ends will not move. I can adjust up and down on the ends, but the center will not move.

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  • Cody Carpenter May 31, 2008

    I'm lso having problems with the red mine also bows from top to middle, bottom to middle, and swoops from middle to left. The convergence is no help for the red will only adjust so much but will not fix.

  • bolaff Jun 02, 2008

    RED OUT OF FOCUS

    I've tried the convergence thing it did not work

    HELP---BONNIE

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  • 8,617 Answers

You need to replace the STK392-110 convergence ICs you need to replace them both. Very easy repair on that model. You can get new replacement ICs at the foloowing link along with free instructions and free instant messageing tech support to help you through the repair. Heres the link.
http://servicemanuals.vstore.ca/

Posted on May 26, 2008

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I have an RCA model #HD61W66 flat screen. This morning when I turned it on it went all 3d like and there was red/green/blue lines at the top of the screen, there was also outlines of the people on the...


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 projection 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.

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 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

Mar 14, 2010 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

Color shadowing on screen


I had similar symptoms about a year ago. Also came on sudden. The red convergence chip had burned out (poor heat sinking on this model Hitachi). Replacing the color convergence chips fixed it. ($50 for parts.) First, however, have you tried the "magic focus" function? That's explained in the manual, which is available online IIRC, but I'd have to look for the link if you need it.

Mar 02, 2010 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Picture has green and red ghosts. went to magic focus and it will not continue thru the red focus, then a #5 is on the bottom of the screen


Ur convergence is dead.Know how to solders?Must replaced two convergence ICS and all it resistors.Tries Tv repair World.com,Tvrepairkits.com for the convergence kit.Tv shop will cost u $300 dollars for parts and labors.

Jan 26, 2010 | Hitachi 51F500 51" Rear Projection...

1 Answer

Auto focus and manual focus(red+will not move left


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.

Apr 17, 2009 | Sony KP-57WS510 57" Rear Projection HDTV

1 Answer

Red is out of focus


the 50h81 convergence kit will work for your model
you can get the kit at the fllowing link with free instructions. heres the link.
http://servicemanuals.vstore.ca/

Jan 22, 2009 | Toshiba 43H71 43" Rear Projection...

1 Answer

Convergence perfect focus not working and double vision


The problem you have is the 2 STK - 392 convergence integrated circuits need replacing the cost in the UK is about £150.
SUPER8

Nov 26, 2008 | Projection Televisions

1 Answer

Convergence problem with TV Pojection Sony KDP65WS550


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.

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.

Oct 08, 2008 | Sony Grand WEGA KF60XBR800 60" Rear...

1 Answer

Replaced STK392-110 convergence chips in tv


1) You will need the original remote for alignment...
Note: Do not open set to adjust red line.....
2) Remove lower front speaker grill cover and possibly the
access panel....find RGB focus / screen block...adjust red
focus...................................T.

P.S.remote control part 23306269 $26.90 ...........

Dec 07, 2007 | Toshiba TP50H95 50" Rear Projection...

1 Answer

My screen is blured (focus problems)


This sounds like one of your convergence IC's has burned out. There are 2 IC's in the set and the one that handles RH (Red Horizontal) has stopped working. The IC should be replaced and the set realigned by someone with experience.

Jun 22, 2007 | Sony KP-51WS510 51" Rear Projection...

1 Answer

My projection tv sony 51 inch red out of focus


Your convergence output IC's have either shorted out or opened up, either way they will have to be replaced and possibly a resistor or two. One distant possiblity is the DCU or the Convergence Yoke, but most likely the IC's. You will probably want a tv repairman to do the repair as there is some soldering to do and some paste/ IC's to install/ calibrate. A repair like this could run from $300 - $500 for IC's depending on who does the repair, The Yoke or DCU would cost a couple hundred more.

Jun 22, 2007 | Sony KP-51HW40 51" Rear Projection...

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