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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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  • Anonymous Jan 01, 2008

    I'm having the same problem on my 52" Samsung rear projection. It is also about 5 yrs old. Does anybody know about how much that costs to have fixed-ballpark figure?

  • ehkiwi Jan 01, 2008

    In the end I had to get a TV repair man in !!

    cost me $400.00

    He replaced both IC's unfortunaly to no avail had to wait another week while he contacted Samsung and waited on some other parts which I think was a resistor kit ( the resistors thru the normal heat generated had lost their values, I think)

    He also cleaned the guns and some other adjustments, picture is fine now

  • ehkiwi Jan 01, 2008

    I had to get a TV repair man in !!! cost me $400.00

    He changed out both IC's to no avail !! Had to wait another week while he contacted Samsung and ordered new parts resistor kit

    Apparently some resistors had lost their values ( heat problem)

    He cleaned the guns and did some other minor adjustments all is fine now picture is great

  • PASQ Mar 12, 2008

    I have replaced the 2 driver chips and the resistor associated,I have installed a fan to keep the chips cool, adjusted the convergence,worked great for 2 weeks,now when I turn on the TV,1 line about a foot from the top

    droops down,the screen flutters,I turn off and on again,it stops fluttering,but the droop is still there,20 minutes later the droop is gone and stay's off

    all night,the next day it's the same process,concern how long this will continue,before something major goes,HITACHI NO HELP AT ALL

  • Anonymous Oct 05, 2008

    red curved line at top of screen- samsung rear projection-wont let me do auto focus on main menu?

  • Anonymous Mar 29, 2009

    same red lines. cant find anyway to fix it and dont have $400

  • gilmo123 May 11, 2010

    I am unable to align the red convergence on my Samsung HCM4215W rear projection HDTV. The factory "perfect picture" has displayed "no sensor data" since the set was repaired in 2004. The set had worked fine for the past 4 years after that repair and just failed suddenly after we returned from a 2 week vacation.



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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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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


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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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.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

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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.

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You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
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