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

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Convergence no good on lower corners and upper screen

I got a convergence problem on my JVC 48wp90. The red would not adjust vertically, so I replaced my ICs and all the corresponding 1 watt resistors. Now my convergence adjusts, but doesn't completely line up. In the screen with the crosses, 123 456 789 positions 4,5,6,8 line up great; position 2 isn't bad either. But 1,3,7, and 9 don't line up. 1 and 3 bend up towards the top of the screen, and 7 and 9 bend down. In the convergence lineup on the grid screen, the red line across the top is wavy and really messed up in the top right corner of the screen? Any suggestions? thanks.

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  • Jamie Bur Jun 26, 2007

    I reordered and re-replaced the ICs and resistors. I put in the upgraded stks. I can adjust the convergence and save the setting, but it won't hold well. The problem is still the wave in the red at the top. Here's a screen shot:

  • Jamie Bur Jun 26, 2007

    Here's a picture of the convergence from the TV menu:

  • Anonymous Dec 09, 2007

    convergence

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It looks like, to me, that you have to recalibrate the convergence ROM in your TV. I have a JVC 48WP34 and it was doing the same thing. I thought I was saving my settings (Writing to ROM) but I was doing it wrong. It took me a while to figure out how to correctly get the lines straight then save them. If I remember correctly, once you get the lines straight, you have to press 2 buttons at the same time to get it to write to the ROM. Anyway, if you can get the grids to line up properly and spaced properly, you shouldn't need to go to the standard convergence screen through the menu. You should be able to push that convergence button inside your TV near the chips you replaced, use the remote to line up the lines (either the 7 8 9 buttons or 100+ 0 return+ buttons change between colors and 2 5 4 6 adjust up down left right). I think I hit the select button then I hit the select and enter button at the same time to get it to save. Every time I tried to save (before trying the combo I just mentioned) then go into the standard convergence screen in the TV menu, it would undo the settings I did in the other convergence screen. So once I tried the save combo I mentioned a sec ago, I haven't tried making any changes in the standard convergence menu. I hope this helps for you.

Posted on Aug 13, 2008

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What you're actually seeing is what the TV looks like without any convergence. I would also suggest replacing them with the 392-150 as they are better at handling the current. If the new STKs don't fix the issue then you may have another issue on the convergence module

Posted on Jun 09, 2007

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I'm assuming you used STK392-110 for a replacement. You could use STK392-150 for greater reliability and don't forget a good heat sink compound. (VERY IMPORTANT). What it sounds like is something even the best of techs battle. You probably didn't buy original Sanyo STK's but instead got a couple of the JApan knock-offs. Might I suggest you carefully replace them again and this time order them from B&D Electronics, Bdent.com on the net. You are assured of getting quality OEM replacements that way... We've had a bad batch that purchasing ordered quite some time ago and 2 out of the 14 ordered worked.. The rest were DOA (dead on arrival). Good Luck Bill

Posted on Jun 08, 2007

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1 Answer

I CANT ADJUST THE RED VERTICAL LINES ON MY JVC REAR PROJECTION TV. i HAVE DONE CONVERGENCE AND MANUALLY ADJUSTED THE RED LINES HORIZONTALLY, BUT NO LUCK WHAT CONTROLS TO USE VERTICALLY


If it will not adjust up or down or left and right the convergence chips need to be replaced.

See attached photos of board that is in your set:


10_16_2011_2_52_30_am.jpg10_16_2011_2_52_47_am.jpg


This can be a do it yourself repair and the parts do not cost a fortune.

Can I help?

SD TECH

Oct 16, 2011 | JVC AV-48WP30 48" Rear Projection...

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Convergence


did u do a repair in recent days
by replacing the convergence ICs?

Jun 18, 2008 | Toshiba 43A10 43" Rear Projection...

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Upper corner of picture looks like 3D. picture on upper corner looks like it is off vertical with this happening. What do you do to fix this Hitachi 57F500 model?


projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.

Common Problem #1) Convergence has gone out

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 pics of convergence problems.


7859b01.jpg

e87380c.jpg

Common 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

69189a5.pngSOLUTION

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

Jan 21, 2011 | Hitachi 57F500 57" Rear Projection...

1 Answer

I have a double picture and the red apears to be


This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Dec 07, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

My set is 10 yrs old. In the upper left and lower


Try adjusting the convergence. If it won't move see below- red IC in particular
This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Oct 18, 2009 | Sony KP-43HT20 43" Rear Projection...

1 Answer

Cannot adjust horizontal blue convergence on WS 55857


You still have bad grounds on the ICs. Or maybe the solder has fused another pin. If not bad grounds on the ICs you have missed them elsewhere...Really concentrate and look for these bad grounds and check your caps with a cap check. And power resistors too!!!!!

Sep 16, 2009 | Mitsubishi WS-55857 55" Rear Projection...

2 Answers

RED CONVERGENCE SCREEN PATTERN BOWING AND CAN'T ADJUST


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,Pioneer 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.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Jun 13, 2009 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

Bowed flickering green screen, black on bottom


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.

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1 Answer

Sony kp53v80 Red convergence stuck vertically


Did you replace the convergence ICs? The 4.7 ohm 1/2wwatt resistors and the pico fuses? Let me know and I will assist you, as often sonys will blow the 3.5 pico and a few of the 4.7 ohm 1/2watt resistors when the Ics fail.

Jul 28, 2008 | Televison & Video

1 Answer

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You need to replace both convergence ICs they are both STK3920110 Ics you may also need a couple of the 6.8 ohm 1/2 watt resistors as that chassis will usually open a couple of the 6.8 resistors. you can get repalcement ICs and resistors at the following link.
http://servicemanuals.vstore.ca/

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