Question about Samsung HCN4226W 42" Rear Projection HDTV-Ready Television

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Samsung Convergence Problem

Would the bowing, (geometry problem) be a convergence issue as well? Thank You,

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  • Pete Buotte Apr 23, 2007

    Can I get a screen jig anywhere, or would I have to go to Samsung?
    Looks like I need to adjust the screen with it after replacing the board.


  • Pete Buotte Apr 23, 2007

    Can I get a screen jig anywhere, or would I have to get it from Samsung?
    Looks like I need to adjust the screen after I installed the board.




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Posted on Apr 23, 2007


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My samsung pcl6215r is having problems with the green screen. The red and blue colors are fine but the green wont line up with them and its making it out of focus badly. It doesn't appear to be dim or...

brent hardin,

Your description of the problem sounds like a convergence issue. You more than likely have lost the convergence ICs. They will need to be replaced and the convergence will have to be set. The green beam should not move. It is the standard which the red and green are moved to overlap. Since you have bow at the top and bottom I would replace the convergence ICs. I have a tip at which explains the problem, how to replace the parts and where to get the replacement parts.

Thanks for using FixYa and for the great rating. Great ratings will keep the experts helping to solve problems. Thank you.


Nov 17, 2010 | Samsung PCL6215R 62" Rear Projection...

1 Answer

Bowed Picture; Still have access to convergence. HELP!

The convergence power supply board is usually the cause of that problem. You can get the replacement Convergence power supply board from

Apr 01, 2010 | RCA D52W23 52" HDTV CRT TV

1 Answer

My 57hx81 has a slight concave bow in the middle top to bottom

Sounds like a problem in the vertical sweep circuit. Check voltages to your convergence ICs. If they are  not to spec then look for bad fuses and capacitors on the power board. These will throw off the DC voltage to the convergence chips causing the bow effect. I've had a single bad pico fuse ($1) cause this symptom. 

Dec 06, 2009 | Toshiba 57HX81 57" Rear Projection...

1 Answer

Rcs hdtv multiple images

The problem you're having is due to the failure of the convergence amplifier circuit. In that circuit are some components which amplify or control the signals to the dynamic convergence yokes, which line up the red green and blue images to superimpose them over each other to create a proper colour picture. When you get a failure in that circuit, it no longer aligns the images properly, and generally you get what appears to be badly set geometry in multiple colours. In some cases you will also get a problem with the part of the power supply that supplies the convergence amplifiers, or the digicon, which is the digital convergence control module.

Jun 12, 2009 | Hitachi 43FDX01B TV

1 Answer

Double Vision & Bowed Screen

Chances are that the convergence amps are bad.
If those are mounted on a separate board, replacing the board would be the easiest thing to do. Running the magic focus or touching up the convergence in the customer menu may be required.

May 04, 2009 | Samsung HCN653W 65" Rear Projection...

1 Answer

Samsung HCM4215w has wavy red lines and bowtie effect

Are you saying that after installing a new convergence board, you still have the same issue? If that's the case, another new board isn't going to resolve this. Also, you can't do a factory reset. Doing that would lose all the convergence and geometry data in the TV and would require a qualified technician hours of work to restore the settings. If you've installed a new board and have the same problem, suspect a problem in the TV's power supply. All convergence circuits require 2 voltages to operate. There will be a postive and a negative voltage of the same value. If you're missing either of these voltages, your convergence will never work properly.


Feb 17, 2009 | Samsung HCM4215W 42" Rear Projection...

1 Answer

Samsung pcl5415rb convergence problems

If you bought a kit from sites such as go back and ask for help. If you bought the parts over the internet without instructions you have two common problems...1) Bad/Fake chips... or 2) You did the repair wrong - because you lack proper instrucitons.

Pico fuses - yes - they can be one of many secondary reasons convergence is not fixed on Samsung models.

Nov 13, 2008 | Samsung PCL5415RB 54" Rear Projection...

1 Answer

Green bow tie, convergence not helping

Yes, your geometry correction has failed and you will need to seek qualified tech for help. You need what are called STKs and you should be able to get the job done inhome for under 300.00

Jun 08, 2008 | Samsung PCL545R 54" Rear Projection...

1 Answer

Red convergence is bad.

Hi, you need to change the convergence ICs , STKs: and some resistors,low values; , after changing them, you will have to go into the service mode, to do some adjustments.that's it.

Nov 27, 2007 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Convergence - bow problem

If you know how to solder on a solid state pruinted circuit board, try to first resolder the convergence IC's. There are two of them, they are black and stand up on a metal heat sink. The IC's will start with stk and have some numbers following that. Sometimes you can get away with resoldering BUT most of the time they have to be replaced. Consult a trained service person if you dont have any TV repair experience as thei like I said is a solisd state set and trhere are really no user replaceable parts inside of them.

Sep 30, 2006 | Mitsubishi WS-55819 55" Rear Projection...

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