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EMERGENCY!!! Broken Samsung 42" Plasma HPT4254X/XAA

Discussion in 'Repairing Electronics' started by ben7, Oct 23, 2010.

  1. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Bit of an understatement - they are absolutely terrible capacitors, and it's worth changing them as a matter of course.

    It's the Capxon capacitors that kill most Samsung TV's.
     
  2. carmusic

    carmusic New Member

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    there is no fan in the TV?? My panasonic 42" has 3 fans in it!! I can feel the warm air getting out of TV
     
  3. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    The early plasma's had fans, later ones take less power and don't have fans - they still use more power and run hotter than LCD's though.
     
  4. dave

    Dave New Member

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  5. ben7

    ben7 Member

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    Yeah mine didn't have any fans in it. If the mosfets overheat again, I am going to fit some fans in it as I have a junk box full of them.
     
  6. koloff

    koloff New Member

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    You would have to replaced all the mosfets, although they seems to be good. They will break down after a period of time and eventually short out and damaged the small diodes and resistors on the bottom of the PC board.
     
  7. Meteoro

    Meteoro New Member

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    Ben, thx for the heads up. Mine just died a few mins ago with the same symptoms. Going to troubleshoot tomorrow. Where did you buy the transistors? Any specific brand you recommend? Thx in advance
     
  8. ben7

    ben7 Member

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    TBH I don't remember where I got the repair kit.

    The four MOSFETs that the repair kit included were:
    2x FQP9N50C ----- TO-220F
    2x FQA13N50C --- TO-3PN

    If any of the capacitors are bulged, I recommend replacing them too!
     
  9. chris taylor

    chris taylor New Member

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    Check for dry joints fet's center heatsink. If ok disconnect supply to YSUS board and check if power supply stays running. Let me know what happens
     
  10. tvtech

    tvtech Well-Known Member Most Helpful Member

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    LOL :D

    My Acer is going to be six years old this December. Best Lappie I ever purchased. It has worked every day for @ least 8 Hours....since new.

    No problems ever. Just the screen is getting dim. As to be expected.

    Regards,
    tvtech
     
  11. chris taylor

    chris taylor New Member

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    After further research you may require a kit of parts to repair your plasma TV. This is available from Chas Hyde & Son Ltd. For your PSU type you want kit P/ No. KT67 £26.34. Hope this will help
     
  12. thedoc8

    thedoc8 New Member

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    I have used Acer laptop and tablets for over 20 years and is the best.
     
  13. Menticol

    Menticol Active Member

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    I noticed this is an old post, but looks like the topic is still going. If you still need the service manual for HPT4254X/XAA I've attached it.

    PS: If you ever need a service manual, ask on a Latin-american repair forum, not on those ridiculous sites that charge a fortune. The "repair instead of throw out" philosophy still applies here, and a lot!
     
    Last edited: Oct 29, 2012

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