Question about Panasonic PT-56HX41 56" Rear Projection Television

2 Answers

Panasonic blue convergence problem

I have a 2002 Panasonic (PT-56HX41PF) rear-projection, 4:3, HDTV whose blue convergence went out all of a sudden yesterday. I turned it on and the picture was awful. The red and green were fine, but the blue will not converge in the corners or on the sides (converges fine down the middle). Any idea what's going on?

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  • Dempmeister Sep 15, 2007

    What would be the likelihood of being able to fix that myself? And if so, where could I get original parts? I got an estimate today of between $500 - $600 dollars ($300 for the parts (like you said), rest for labor) and I just don't know if I want to put that much money into it. The more expensive it is the more I think about just buying a new TV.

  • Dempmeister Sep 16, 2007

    I do work on computers and have done a little soldering, so I'll give it a shot. Do you know where I can get a schematic diagram or instructions for that model tv? The bdent.com site has the integrated circuit that I think I need; another post on Fixya said two STK392-110 circuits would do it. Is that correct?

  • Dempmeister Sep 27, 2007

    You nailed it techman! I replaced the two chips and it works great! If you're ever in Colorado Springs look me up - you've got a free dinner coming. :-) It's the least I can do for all the money you saved me. Thanks man.

    Best regards,
    Dempsey

  • jlshep May 02, 2008

    Same problem with Blue and now red. Need schematic or picture to see the chip layout. Can replace and hope to have the same success, but I have no manuals to refer to.

  • jlshep May 02, 2008

    That fixed it. Went to the local electronics store "Audio Lab" Plug... and picked up what I needed and now its fixed. Thanks.. by my count thats $600.00 plus dollars tech man saved and possible big land fill items. Thanks for your help!

  • kerryfan Oct 18, 2008

    I have same problem with the TV of same module, and I know how to soIder/unsolder ICs. I have bought 2 ICs of STK392-110, when I was trying to fix it I got a problem: I couldn't move PCB out. There are 2 boards, one is green and one is yellow. I want to move the green one out, but there are 4 connectors joining these 2 boards together. I cannot disconnect the green board from another one, so I cannot take the board out to fix it. Could you tell me how to get the board out? I'm looking forward to hearing from you soon.



    Kerry Fan.

    My email address: fan_xian@yahoo.com

  • pfinni2364 Feb 06, 2009

    hi i have the same problem changed both stk932-110 made by sanyo

    set will come on but no picture blue and green on but faint red is on but it looks like it is out my solder joints look good under a magnifiging glass

    were did i go wrong

  • Anonymous May 07, 2009

    I have bought 2 circuits, not real good with repairs, but I am going to give it a try. Do I need to change both if only the blue is out? also, which of the two is the blue? Do you have a copy of the circuit board? PT-4743G.

    Thanks

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I found them. was looking for something a bit smaller. Thanks will try to replace.

Posted on May 02, 2008

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  • Master
  • 3,130 Answers

Yea, you have to have the two convergence Amp IC's replaced. Should run you about 300 bucks or so. Good Luck

Posted on Sep 14, 2007

  • 1 more comment 
  • Larry  Dillon
    Larry Dillon Sep 15, 2007

    No the 300 dollars was for parts and labor, the parts should not cost you for the original IC, about 25 to 30 bucks. They are ripping you off big time. This is an in the home repair my friend. Can you solder on printed circuit boards? Can you follow a schematic diagram? If you say no, play it safe and get another price. %00 to 600 is WAY WAY to high for 30 bucks worth of parts.

  • Larry  Dillon
    Larry Dillon Sep 19, 2007

    Get the right IC's for this TV set. The ones that do not have the word Sanyo marked on them they are aftermarket cheapo parts, or factory rejects. Always stick to the original replacement parts. I always use this place for original parts, plus they sell them in pairs, just what you need. http://www.electronic-repair-kits.com/in...

  • Larry  Dillon
    Larry Dillon Sep 27, 2007

    Glad to hear you fixed the tv set. Contact me at techman32k@yahoo.com.

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1 Answer

Panasonic (PT-56HX41PF) rear-projection tv with no picture


The three blinks indicates a convergence IC fault. The convergence ICs must be replaced with the manufacturer replacement part. Use only the original replacement part. Your set uses STK392-110 convergence ICs.
These ICs are mounted on a large heat sink. Yes, you can replace it yourself and save few hundred bucks. But you must be knowledgeable enough on how to solder, resolder and use a multimeter.
You will need:
  1. Convergence ICs
  2. Heat sink grease or thermal compound
  3. Soldering iron
  4. Solder lead.
  5. Digital multimeter
  6. Solder pump
  7. Small side cutter
Feel free to inform me if you decide to replace the ICs yourself

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This is a common problem. Your convergence has gone out.

Common symptoms are...

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Go here for a solution...

http://www.fixya.com/support/r2861627-updated_convergence_problems_amp

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