Question about Panasonic PT-51HX41 51" Rear Projection Television

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Convergence problem ,Help Please

I'll try to keep post short,
Problem Is I Let warranty run out on Panasonic TV pt51hx41 in july 08.TV picture went out in Dec.08 had ,bow tie effect ,curved colors convergence Crosses bottom left red looked twisted and smaller would not line up, called repair man
going to pay out of pocket to have tv fix.Came out look said it could be fix that it was the convergence chips watch him put new ones in .Did not fix tv put some resistors in board.Gave up and took tv to has shop to work on it.Come to find out he could not fix it. Got tv back.I recieved a GE service contact in mail to renew warranty on tv a day before I got tv back from shop .Called GE said it was find that it had been worked on be another company payed for warranty had to wait 30 days before it took affect.Called GE sent TV repair man out.Look at tv said same thing convergence chip bad opens tv replaces chips Picture still twisted.He got to looking other man had put wrong resistors in board.
TV called for a 2.?ohm but it had a 3.?ohm in board.
When repair man find this. He said it caused main memory to get erased and throw colors to far off.Tv is non repairable .Now warranty won't cover the repair because it hand wrong parts installed.I honstly
Think tv had memory lost before first guy worked on it.Is there anyone out there that knows what parts I would need to fix tv myself,steps for that repair or would it just cost to much thanks for your time reading post to help. Not a expert at all but have 2 yrs high school electronics Thanks again KS

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  • smith499456 Feb 13, 2009

    I'm not sure which resistors was wrongly placed in board.If Someone has a scamatics they could send me? I could look and see if I can find which resistors are wrong.Watched first guy replace 6 or 8 resistors .But didn't know he was putting in wrong resistors.

  • smith499456 Feb 14, 2009

    Thanks for the replys.I got one more ?. Took TNPH0370 board out found lots of resistors that had been replaced.Just buy looking at soldering on board.I found a refurbished Board online for sale.Could I just switch out old board w/ Refub.board.Or is there other step that are involed in switching boards out?


  • smith499456 Feb 16, 2009

    Thanks for checking on this issue.

    I will hold off on buying board. Your right about the price and availabilaty.I did find one web site that has it in stock and price of $290.Still a lot of money.Would be nice if it turns out to be a

    small componate that I could replaced.

    One more thing don't know if it will help in your reserch.

    But if I remember right 2nd repair man was talking about the memory that you talk about in your 1st reply the factory convergence settings and that the Geometry was to much out of alinement due to memory loss to be pulled back inline even though the service menu.

    Thanks again


  • Anonymous Mar 05, 2009

    Same problem. Blue shadow on screen. Can't adjust crosses on blue code into white crosses. When I try to pull the blue cross inward it gets to a point where it can't get into the white cross line up field and even starts to repel back the other direction. In these cases, is there even a really good fix-it result or is this near the end of the set?

    Thanks -- Glenn



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Something is not right here. Is there any possibility that you can get the circuit designation (Rxxx) of the resistors that were "incorrect"? I am not aware of anything like this that can cause the "memory to be erased". The only memory in that area would be the factory convergence settings which can be modified from the service menu. Please try to supply the resistor IDs and I'll check on this.


Posted on Feb 13, 2009

  • ABRsvcs Feb 13, 2009

    If you can identify the ones that the first guy replaced, post them here. The schematic is not available for free, so I can't send it out. I do have access to it though.



  • ABRsvcs Feb 14, 2009

    That board is the "A" board. The price for it would have been over $500 if available. I still find it hard to believe that a change from 2.x to a 3.x ohm resistor caused a major problem. There is something fishy going on here. I have requested a copy of the service manual so I can research this a bit more for you. Hold off on the refurb board for a few days. I should be receiving the manual today or tomorrow.




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If you have gone into the customer menu and blue is skewed and will not adjust you have a convergence problem.

I will attach a photo--it will not look exactly like what you have but should confirm if it is your problem.

Most shops get 300 or more for this repair but actual total parts cost should be under 30 dollars if you buy the parts at the right place (I know a seller on Ebay).


If you or someone you know can do it for you--you can save the set and a lot of money.

I can post the instructions here and if you think you can do it I can tell you the seller on Ebay to get the parts from--repair involves two things--being able to get at the chips this set uses and being able to unsolder and replace them.

I will try to post a photo of the two chips this set uses in a minute after I post this.

If you want the instructions let me know and I will post them for you.

If this has helped you rate this solution as I do this here for free.


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