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

1 Answer

Is this the convergence problem every one is talking about??

Turned my TV on the other day and there was a double image on the screen so i set the convergence and all was fine for a day or two now there is a green swooping line at the top and the convergence is all messed up did the IC'S STK 392-110'S go bad ??and if so is there a way to test them?

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  • dlgianetti Jun 29, 2008

    i tested each resistor on the convergence board and the where all in specs. going to order the chips now and see how it goes.. thanks.

  • dlgianetti Jul 03, 2008

    I got the new ICs in and everything looks alot better but the blue convergence is a little off and the convergence menu will not let me adjust it now?? before it would any idea?? is there some kind of a service mode i have to go into now??

  • dlgianetti Jul 04, 2008

    i checked them in circuit that was the problem lol im going to try to check them tomorrow

  • angael Jul 05, 2008

    a Blue Ghost image at the side of everything. Have been told this is a "BULB" (?). I don't have the operating manual (son in law lost it!). How do you set the Convergence?

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  • JVC Master
  • 8,617 Answers

Yes the ICs have gone bad and possibly a few of the convergence resistors as well. You can get replacement ICs and resistors at the following link and they provide free instalation instructions with pictures and free tech support.
http://servicemanuals.vstore.ca/

Posted on Jun 29, 2008

  • 1 more comment 
  • Sonny Berry
    Sonny Berry Jun 29, 2008

    youre welcome, Let me know if you need any assistance.

  • Sonny Berry
    Sonny Berry Jul 04, 2008

    Check the solder connections on the ICs to be certain none of the pins are bridged with solder, and also did you lift the resistors from circuit to test them? As resistors cant be checked in circuit , Because a open resistor will read good if checked in circuit.

  • Sonny Berry
    Sonny Berry Jul 04, 2008

    yes they have to be tested out of circuit, they also have to be within 5% of the rated tolerance or they will need to be replaced.

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1 Answer

My 52 inch RCA projection TV has the picture wide on top and small at the bottom..what can cause this and how can it be fixed??


This sounds like a problem with "convergence" of the TV. The convergence circuitry performs the electronic aiming of the Red, Blue & Green projectors. Typical convergence problems result in distorted images on the screen such as: double or triple images on part or all of the screen, wavy lines, curled edges, excessive red, green or blue color or tint, etc. Sometimes, convergence issues can be corrected in a menu setting of the TV that has to do with "Picture Settings" or "Advanced Settings".

If the colors are out of alignment a great deal or went out "all of a sudden" it will probably not be repairable via the menu adjustment described above - but is certainly worth trying.

If it does not straighten out with the menu adjustment, it will probably require replacement of the convergence integrated circuit(s) chips located in the TV. This was a "big ticket" repair years ago, but can be done sometimes for as little as $40 in parts. Don't let the low price fool you though.. It can easily take several hours (or more) to access, remove & replace the components and reassemble the TV. Soldering skills are a must - and I'm not talking about soldering plumbing pipes here either. These are delicate electronic parts and need a 15 - 30 watt soldering iron and de-soldering braid or "solder ******" and LOTS of patience to perform CORRECTLY. As such, it is "not a DIY project" unless you're willing to risk turning your TV into a large floor model paper weight. If you decide to attempt this repair, you should google your TV brand and model along with the term "convergence". Parts, costs and procedures vary by TV. Unplug the TV for a day or so before starting the work to let capacitors discharge fully - just to be safe. Lastly, if you're going to attempt the repair - don't forget to purchase silicone heat sink compound - it is an absolute *must*!

Sep 24, 2009 | RCA Televison & Video

1 Answer

Seeing double


You need to replace the convergence board in your tv .


Also you have mentioned it is 5 years old so its time to replace it .
But it will not be cost effective one .


SAM ANDERSON

Sep 21, 2008 | JVC AV-48WP74 48" Rear Projection...

2 Answers

Tv has double image color red and a curl line on left upper corner also sometime in middle of tv it has line


This sounds like a problem with "convergence" of the TV. Convergence is the electronic aiming of the Red, Blue & Green projectors. Typical convergence problems look like double or triple images on part or all of the screen, wavy lines, curled edges, excessive red, green or blue color or tint, etc. Sometimes, convergence issues can be corrected in a menu setting of the TV that has to do with "Picture Settings" or "Advanced Settings".

If the colors are out of alignment a great deal or went out "all of a sudden" it will probably not be repairable via the menu adjustment described above - but is certainly worth trying.

If it does not straighten out with the menu adjustment, it will probably require replacement of the convergence integrated circuit(s) chips located in the TV. This was a big ticket repair years ago, but can be done sometimes for as little as $40 in parts. Don't let the low price fool you though.. It can easily take several hours (or more!) to access, remove & replace the components and reassemble the TV. Soldering skills are a must - and I'm not talking about soldering plumbing pipes here either. These are delicate electronic parts and need a 15 - 30 watt soldering iron and desoldering braid or solder ****** and LOTS of patience to perform CORRECTLY. As such, it is another "not a DIY project" unless you're willing to turn your TV into a large floor model paper weight. If you decide to attempt this repair, you should google your TV brand and model along with the term "convergence". Parts, costs and procedures vary by TV. Unplug the TV for a day or so before starting the work to let capacitors discharge fully - just to be safe. Lastly - don't forget the heat sink compound - it is an absolute *must*!

Sep 17, 2009 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Samsung HCN4727W Rear Projection TV, green screen, audio works


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,Akai2_bing.gif,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...

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

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

Jul 10, 2009 | Samsung HL-R4667W Rear Projection...

2 Answers

Double Image Red and Green


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


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 email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.

Feb 08, 2009 | Sony KP-46WT510 46" Rear Projection HDTV

1 Answer

DOUBLE IMAGES


there is a problem with tthe convergence section this is something a tech can do

Sep 23, 2008 | Toshiba TZ50V51 50" Rear Projection...

1 Answer

Distortion and double imaging


Projection sets have two very common problems.

The first common problem is 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

Sep 07, 2008 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Seeing double


need to replace the convergence ICs and possibly the convergence resitors . You need STK392-110 ICs you can get the ICs and the convergence resiistor kit for your model at the following link with free instalation instructions
http://servicemanuals.vstore.ca/

Jul 28, 2008 | JVC AV-48WP74 48" Rear Projection...

3 Answers

Double image, blue and yellow images


convergence ic are going or have loose connection in the convergence amp ic area.
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Jan 15, 2008 | Hitachi 43FDX01B TV

4 Answers

DOUBLE IMAGES


How do we adjust convergence? I went to the service menu and all I see is alot of settings none of which help me out.

Can anyone explain this in further detail?

TIA

Aug 26, 2007 | Sony KP-53HS30 53" Rear Projection...

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