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I have a Dell 42" HD Plasma Model # W4200HD When I turn it on, there is a "smearing" image is the best way to describe it. It looks as if the picture is has been converted to just vertical bars/ lines. Also, there is a faint ozone smell or overheating plastics smell when the TV is on... I assume this is the part/board that's messed up frying itself out further. I see that it's not cost effective to send this in to be repaired, I am pretty handy with electronics myself but have never cracked open a plasma. Could someone tell me if this sounds like a specific board that needs to be replaced and if so, where to get them? Thank you!

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  • austin_tracy Mar 09, 2009

    Just to add clarification... When I was watching this, the picture was fine, then went black and converted to these verticle lines. There was nothing dropped or any damage to the plasma screen itself.

    I have taken a picture of the screen, and it's located at:
    http://i236.photobucket.com/albums/ff73/...

    I have also used my super nose, and believe that the burning magic smoke smell seems to be coming from a board on the top of the TV with the following writing:

    Model No 42' HDV3
    PCB NO : LJ41-01931A
    PCB Rev (can't read, obstructed)
    PBA No : LJ92-00896A

    This board is located at the top LEFT of the TV (when viewing the back side)

    There also seems to be a slight buzz coming from this area...

    If this board went bad, would it cause the display that I pictured?

    If so, where can I get a replacement board?

  • austin_tracy Mar 10, 2009

    OK, found where the magic smoke is coming from.. (Magic smoke is a term a geek friend of mine made... "All electronic components work on magic smoke... apply too much voltage to them, and the magic smoke comes out and it stops working")



    Anyways, it apears its the lower Y board... a black flat square processor seems to have burnt out.



    is this burnt out board the cause of the problem, or could it be the the result of another problem?



    Thanks



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7 Answers

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That is a bad low buffer, and the lines are bad digital data because buffer is faulty.

First ensure the problem is not a faulty receiver box, test tv with no external box and tested cables.

If the problem is the TV, then you need to test and eventually replace the low buffer board.

here same problem from different user:

I have a Dell 42

Regarding the replacement, your Dell mounts a Toshiba Low buffer, the spare part is available below:

cba28c0.jpg

42HDV3.1 F-TCP BUFFER LJ41-01931A from TOSHIBA 42HP83
All parts must be tested befor replacements and repairs must be done by a competent technician.

do not forget to evaluate the solution afterward.

Thanks.

Posted on Mar 16, 2009

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Its the result of the pcb main logic burn out. i would replace both the y interface and the pcb main logic assembley. repairing each individual part may inflate the repair bill. i would replace the entire boards.

Posted on Mar 10, 2009

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Yes, the power supply has capacitors on it which can fail and send to high of a voltage to other component boards.
A faulty color wheel will also mess up the colors, but would not give a burning smell.
The balast that is connected to color wheel if faulty may also cause similar problems. But would usually just make the tv shut off and not be able to turn back on.
SO I DO BELIEVE THAT YOUR POWER SUPPLY IS BAD AND NEEDS TO BE REPAIRED OR REPLACED

Posted on Mar 09, 2009

  • 5 more comments 
  • Nate Stansfield
    Nate Stansfield Mar 16, 2009

    If the processor looks burnt and everything else LOOKS ok, I would firstly replace processor, than see if problem still persists. Than you will know if your good or will need to further repair.

  • Nate Stansfield
    Nate Stansfield Mar 31, 2009

    You have a convergance problem with the system board. One of your capacitors is burning out causing convergence problems. This is actually a common problem with monitors and televisions. I honestly would have it repaired by a tech unless you want to buy a system board and replace it yourself.

  • Nate Stansfield
    Nate Stansfield Mar 31, 2009

    when the caps on your power supply start to go, it sends to high of a voltage to the y board. so check to make sure power suppy is not pushing over 13 volts.

  • Nate Stansfield
    Nate Stansfield Mar 31, 2009

    so far my findings have been correct. Hope we can get this figured out for you

  • Nate Stansfield
    Nate Stansfield Apr 01, 2009

    did you replace the power supply and processor? Thats what would be causing your problem

  • Nate Stansfield
    Nate Stansfield Apr 04, 2009

    Did my suggestion work out for you?



  • Nate Stansfield
    Nate Stansfield Apr 23, 2009

    I still believe the processor burnt out because the capacitors in the power supply are wearing out sending to high of a voltage to the processor. It may also be due to a faulty wire or board capacitor that is shot causing high voltage to the processor.

    How did this work for you?


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On the main power board there are two ic the number is I348JC and other number is I376JL this 2 IC needs to be checked and replaced.as they control the picture quality and sharpness in the tv through main board.

Posted on Mar 09, 2009

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You would most likely need a new main power board or a display board, but you will not know that until you open it up. When you do, be careful not to touch just anything because you could get a deadly shock from it even after it has been unplugged. Try to look for any burnt capacitors and/or blown fuses, and also, look for any melted plastic as you smelled some coming from the tv. That should be obvious enough for you to see depending on how much you smelled. Where ever you find the problem is what you need to replace, and it may not have to be the whole board.

Posted on Mar 09, 2009

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Hi there
hey i dont know if you have a waranty on it or not but if you do i would use it. if not... if you have ever opened up the case on the computer and seen the motherboard that is what the bord on a monitor looks like there is several things that coulde go wrong like capacitors diods filiments ect ect i could go on and on but if you are able to get it op[en and you do smell like somthing has burndt look for somthing out of the ordinary like dark brown areas and on some capacitors the ends of them are supposed to be flat and if they are dome shapped that is or is starting to become a problem i would start there and see what you find ok please let me know what you find out

Posted on Mar 09, 2009

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Hi

if the lines are running top to bottom.........that can be a bad plasma display or if lucky the ,x driver boards on the bottom of the panel. The likely hood of a bad plasma panel is high and will not be cost effective if so. Some early sets had a few identical driver boards you could trade around to avoid buying a part and find the display is at fault. It would be the board on the bottom of the panel in the area of the lines.........

Please revert for any clarifications.

Thanks
Rylee

Posted on Mar 09, 2009

  • Rylee Smith
    Rylee Smith Mar 10, 2009

    Replacing the burnt board will fix your issue however, you should make sure that connectors to the y board are also fine. And, also check the x-board for burnt components.

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