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

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Convergence Issue, Blu Gun..Pin Cushin effect Top to Bot on screen? Help!

Is this something I can resolve by just replacing a component myself. I am a tech on Semiconductor equipment, I should be able to handle the R&R of the part or component. Where can I get what I need? Or would it be easier to remove the PCB and swap it with a repaired one.. Any idea on cost?

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  • Anonymous Feb 26, 2008

    Convergence issue and a pincousion effect

  • Tbaker Feb 27, 2008

    I'm having a problem with the Blue image convergence, it appears as a 'Bowed' Image line on screen. Manual adjustments thru remote do not go far enough to correct 100%......



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As a gift to my parents, I purchased a Panasonic Rear Projection Television in the summer of 2001. I paid approximately $2,200 and thought I was getting a great deal as I had always thought of Panasonic as one of the leaders in consumer electronics.

About 2 to 2 ½ years into owning this TV, the red convergence started to malfunction. I contacted Panasonic and was told that my limited warranty was exactly that, LIMITED. It did not cover convergence problems. So I took this issue into my own hands and called for repair estimates. The cheapest estimate for labor and parts came to a whopping a $350.

Reluctantly, I hired a TV repairman and agreed to pay this exorbitant amount of money. He checked various components inside the TV board and proceeded to replace 2 convergence amps plus the associated resistors. There was some soldering involved and the whole process took about 2 hours. Finally, he adjusted the convergence and other data with the remote and the TV was back to normal. I was satisfied.

Fast forward another 2 years, my green convergence is out. Now, the cost of parts and labor are up to an average of $400, I’ll blame that on inflation. I bite the bullet and hire another repairman because I was too cheap to throw this unit away and buy a new TV. I should have just invested a little more money on a brand new TV set, but hindsight is 20/20.

This time, I ask the repairman a lot of questions like a student and watch his work like an eagle. He was very sympathetic and tried his best to educate me on this issue. I learned that these particular convergence amps (also known as IC’s) get very hot and blow out after a few years. He also noted that over 80% of rear projection TVs will have convergence problems due to this faulty convergence amp. The problem has become so prevalent that many repairmen are using an upgraded version of this part. The original installed part number is STK 392–110; the upgraded part number is STK 392–180. Apparently, the STK392–110 lacks in thermal performance. Simply put, they get too hot and finally they blow. Another thing he mentioned was that when this part was originally installed by Panasonic, the folks at the manufacturing plant were not applying the thermal compound grease on these ICs efficiently, thereby causing more heat to build on the IC and again causing it to blow.

Fast forward to February 2008. My horizontal blue convergence is out! I’m not paying anyone to fix it! I want Panasonic to take some responsibility and remedy my situation. On a whim, I googled my TV’s model number on the internet, PT47WX49E. There were hundreds, if not thousands of others with the same problem. There were way too many posts and forums regarding this issue. I was appalled to find that the convergence was blowing out on average of 2–4 years. It wasn’t just my particular TV model; several other Panasonic models were having the same problems. Now, would I have purchased this unit for over $2,000 if I knew that it would have problems after 2 years? That would be a definite NO.

I’ve called Panasonic at 800–211–7262 several times to absolutely no avail. Though they were somewhat polite, they were not helpful at all. In fact, I felt as though I was talking to a recording each time. The so–called reps knew nothing about the products they were selling to the public! All they could say was that the TV was no longer under warranty or there are no known recalls on this particular model or something similar in nature. They suggested I hire an authorized Panasonic repair technician!

I am well educated, but I am not wealthy by any means. I don’t have the luxury of paying $400 every 2 years to maintain this faulty TV. Even if I did have the money, this is principally WRONG on every level! This is purely a manufacturing defect. Panasonic used a faulty part. No one buys a TV with the expectation of it lasting less than 2 to 3 years. I feel terrible inside. My parents are out of a TV for the third time. They are in their 70’s, and this is pretty much how they get their source of news and entertainment. I just can’t afford another TV or another repair for that matter.

At this point, I am at my wit’s end. Has there been a class action suit against Panasonic yet? Or is it in the works as I write this? I refuse to sit back and take this from Panasonic. Who wants to file a class action suit against them with me? I’ve spent way too much time, money and energy on this issue. We need to be compensated.

Posted on Mar 13, 2008

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I'm sorry, I did not understand the original defect with your set.

Posted on Feb 26, 2008

  • Michael Borelli Feb 27, 2008

    You'll need to do the repairs on the convergence board to get within limits of remote adjustmant....accordianman



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1 Answer

Sony KP-65WV600 10/26/2002 rear projection TV. Blue gun went out and glows orange. Convergence chip is out (can not adjust convergence). Sony refuses to help saying my model is not covered by any offer....

The convergence repair if done is possible do it your self; If you have also a bad blue picture tube or some issue related to the tubes then the set is beyond any reasonable repair.,

not always easy to replace a set that cost in its day a lot of money but it is now about 9 years old and that is about average to this type of set.


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It still convergence chip problem, check big resistors nearby these chips that would be open or devalued and causing problem, specially in green convergence area, your green tube/ gun is just fine and just not getting convergence output signal to show correct image.
I would suggest to download service manual copy of this tv for small fee from any website and fix the issue with schematics help.

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Rear Projection - Color convergence/bowtie effect


Thanks for using FixYa. From what you have described it seems that you have to replace the convergence IC and also check the power resistor, if values are not exact you have to replace them. These ICs are located behind the black heat sink; you can see once you open the back off the TV. Also, the convergence board should be checked for cracked solder joints and please make sure to check the resistors as if they are shot the ICs might blow again. All this is only recommended if you have electrical expertise and know how to solder/re-solder components, if not then you should get this done by a professional. The typical cost to get this fixed by a pro is around $250-$300. Please do accept the solution if the issue is resolved or else revert for further assistance.


Apr 04, 2010 | RCA HD56W66 56" HDTV

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Hd52w59, curve at bottom and top, shadow doubles, colors are messed up

Your symptom sounds like a damaged convergence IC.

There are two and sometimes three very large IC’s that control the convergence in a big screen set. They are secured to a very large aluminum heat sink.

If your colors line up in the middle of the set and at the top but the picture is concave then you may have a faulty component in the pincushion circuit. If the top and bottom are the only things that are wrong then it may be just be the top and bottom pin cushion circuit.

You may want to consult a Television Repair Technician, or repair this yourself. If you want to tackle this yourself, let me know, I can give you some direction for the repair

I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up) If you cant rate this post with the highest rating, then please comment to this post and I will try to help you further.

Jul 03, 2009 | RCA Televison & Video

1 Answer

Tohsiba 61HD70 Rear Projection

Yes, its a convergence problem and you may be able to fix this yourself if you have a soldering station and a few basic tools. Its possible that all that is necessary is to re-solder the pin connections on the convergence output ICs on the underside of the cicuit board. There may also be a poor solder connection on a jumper wire connection near the ICs. Its near the plastic frame. If this does not resolve the issue, you will need to replace the ICs. Remember to unplug the TV before doing any service.

Feb 15, 2009 | Toshiba 61H70 61" Rear Projection...

2 Answers


can you post a picture of your screen or send it to my email as it sounds like its just the convergence Ics and the 6.8 ohm resistors, but a pic would help me do a accurate diagfnosis.

Jun 28, 2008 | Philips 55PP9363 55" Rear Projection...

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Convergence is completely messed up and Audio drops

can someone tell me how to fix the convergence the red and the blue are messed up and the picture perfect doesnt work.

May 27, 2008 | Samsung PCH521R 52" Rear Projection...

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Green Bows on top and bottom

This is most likely either bad connections on the convergence IC or a defective IC. Try resoldering the pins first. If that fails to resolve the problem, replace the IC.

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Green converge lines are gone!

when you are in factory convergence on your hand unit press buttons 1-9 usally 1,2,3 theses should show r,g,b patterns, try them and see if your green is there,

Dec 16, 2007 | Panasonic PT-47WX53 47" Rear Projection...

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