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Samsung 52" rear Projection TV Convergence Problem

The Tv is about 5 years old and has developed red drooping lines at times with red lettering.. presume this is a red convergence problem, but I am no expert If the convergence is controlled by a chip (IC) I am experinced enough to change out the chip whether the chip is a push in or soldered on the main board as long as it does not require test equipment following installation. I do not have a schematic but hopefully there might be one inside the back cover. If this is possible where can I buy the IC from !! not being in the trade Can anyone help, comments. Thank you

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Re: Samsung 52" rear Projection TV Convergence Problem

Replace both STK392-040 convergence IC's with OEM or better
quality = I use Panasonic with great success. They are soldered
in and requires at least PCB removal or perhaps entire chassis.
Please post response if you need more help...................T

Posted on Nov 23, 2007

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Re: Samsung 52" rear Projection TV Convergence Problem

Hi. Depending on how bad the red convergence gone out you may not need any spare parts. You did not say that you have entered the normal menu & adjusted the convergence. If you havent adjusted the convergence which you should do a couple of times a year go in to the normal menu go to convergence & set it up. If it wont set up then you do have a problem & will need new ICs fitted.

Posted on Sep 12, 2007

Re: Samsung 52" rear Projection TV Convergence Problem

Thanks. I haven't tried it taht way. I've only used auto focus. I'll give it a try.

Posted on Jan 01, 2008

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I have a 8 year old 57in Sony projection HDTV,when the picture is dark you can see faint blue lines in a curved arch like pattern across the screen.Any ideas? Thanks

The tv problems is call a convergence picture problems,it is just starting to developing.This problems when it is fully developing into a convergence picture problems to the tv eventually.Tv will develope into a colors lines R,G,B mis alignments,have a colors shadow pictures or into a picture 3D look alike.Eventually the tv convergence board will dies,have to have it parts replaced like 2 STK convergence ICS and some or all of it resistors too.This problems the tvs shops will cost u like $300-350 for parts and lobors.

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Have a WD-52725 Mitsubishi TV. Notices lines

Ur tv have convergence problems before,that why tv getting colors lines somtimes alot,sometimes not.The 2 STK convergence ICS was defective.Now the 2 STK convergence ICS are now totally dead.The shop will cost u $300-350 for parts and labors for the 2 STK convergence ICS,and it supporting resistors.

May 12, 2010 | Mitsubishi WD-52725 52". Rear Projection...

1 Answer

Conversion-----the red lines are distorted so badly they won't move at all. I've managed to line the other lines up. The top left quadrant has drooped so badly that they will not adjust back. The 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.

Convergence problems are very common on all Projection TV sets including Sony, Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit from the link below.

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 - TV may also make a chirping noise.
Here are some photos of convergence problems.


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.

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 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 know what you are doing. If you have never done this before we would advise calling a shop or if you want to do it yourself get a complete kit with instructions and support from

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1 Answer

Hi I have a 52" RCA big screen tv that is only 3 years old however we turned it on today and it is showing some red blue and green lines and the picture is blurry

Hello clara7,

This denotes a convergence problem. I would suggest that first you enter the menu of your TV ad try to do an auto converge on your set, if this does not work I would suspect that the convergence ICs have gone bad and need to be replaced. I would suggest that you have a qualified TV repair technician replace the convergence ICs in this set.I hope this helps,Shuttle83

Jun 08, 2009 | RCA P52939 52" Rear Projection Television

1 Answer

Cannot not line up the red and blue lines on my samsung projection tv. it is a 2002 samsung tv

Needs new convergence amps and possibly a few low ohm resistors.
Those Samsung amps usually run hot to the touch and sometimes only last 4 to 5 years depending on usage.

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RCA 52" projection tv convergence problems,can i fix it?i try auto convergence? the model is P52920BL and is a 1998 i try the green centering blue & red convergence in the setup of the tv,and it goes back...

My RCA 52 rear projection TV has the letters getting blurry on top and bottom, Picture is OK but visually losing my eyesight staring at blurry numbers and letters.

Is this a bulb or simple fix ??

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1 Answer

Ghosting in red ,blue & green

Sounds like an allinment problem with the color projection you can allin yourself via small screws on color tubes in rear. but be careful as tv needs to be on to do it.

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have convergence rebuilt........

Jun 01, 2008 | RCA HD52W56 52" Rear Projection HDTV

1 Answer

Samsung 52" tantus pch521r convergence panel

I found a this SITE that carries that convergence assembly for your TV.
Good Luck.

Mar 10, 2008 | Samsung PCH521R 52" Rear Projection...

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