Question about HP PL4245N 42 in. HD-Ready Plasma Television

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Power on problem

Two leds will turn on then after a second one will turn off. i can here relays clicking when the leds turn on and off.. seems like the power board is waiting for a signal it never gets - then it goes into standby. I dont think its the power boards. Any suggestions?

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  • Robert S.
    Robert S. May 28, 2008

    The set is not under warranty unfortunately. I did notice that two 250V, 1000uF caps were bulging (maybe failed and outgassing - although I don't measure a short) and two other caps 450V 330uF looking a little bulging too. I plan to replace the two 1000uF caps - do you think this will help? I've disconnected all other boards except one; the system seems to want this one connected in order to turn on any LEDs. The power board is what I'm suspecting but it would be nice to get a schematic, any ideas on where to get a schematic?

  • Robert S.
    Robert S. Jun 12, 2008

    Replaced the capacitors with no luck. Measured the parts I replaced and they were within spec. Any other suggestions? I read somewhere that the Y-main board may cause this problem i.e. even if I replace the power supply it may not be the solution. Any way to fake out the power supply to make it turn on? FYI the board is actually made by MAXENT (LJ44-00068A).

  • Robert S.
    Robert S. Jul 19, 2008

    I found one bad relay by applying 5V dc to the coil and measuring the contact as open, and one bad 6.8 ohm 7W resistor - both on the input AC circuitry. I replaced both and now I have a fully functional plasma tv! :) Total cost for tv: $12. Thank you FixYa, especially Abrsvcs.

  • kjlegend Feb 06, 2009

    I have an HP 50 inch plasma that is doing the exact same thing. Can you post some pics or email them to me at rrobert4??? On what you did...

    I have replaced the Ysus board with no luck...



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A problemm is being deteced during the startup process. To prevent further damage, the set is shutdown. What you are seeing is repeated attempts to startup the set. If the set is less than 1 year old, it should still be under warranty. Call for warranty service.

Posted on May 28, 2008

  • ABRsvcs May 28, 2008

    Replace the 330uF caps too. This may work, but there is no guarantee. These units are board replacement only at most authorized service centers. Schematics are not available. Try the caps and report back with the results.


  • ABRsvcs Jun 12, 2008

    Depending upon how the caps are measured, you will feel that they are OK. If they have bulged at all, they will fail under load. Look around for caps on the same line. These caps are filter caps and there will be others further along. Check also for Zener diodes that are out of spec or even general rectifier diodes. It is difficult to diagnose this remotely. Look around and check also for low valued resistors that may have opened up or changed value significantly.




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