Question about Panasonic PT-51HX40 51" Rear Projection Television

3 Answers

Panny Pt-51hx40 shuts off

Hey, I have a Panny PT-51HX40 RPTV that is about 10 years old. It worked fine yesterday, now today when I turn it on, it comes on for about 2 seconds, then turns off. I see all the posts replacing the transistors and capacitors, so I am wondering if I should do that to mine?

I am clueless about electronics, but I can solder fine. I have done quite a bit of misc. electrical stuff, but I can not read a schematic to save my life. I do have the factory repair manual with all the schematics, but I cannot find the 3 items that everyone is replacing (Q553,c555 and c556)


Any tips?

Brew

Posted by on

  • 5 more comments 
  • tsbrewers Jul 14, 2008

    It is me or the tv goes in to the garbage. It is an old tv that I cannot afford to stick $3-400 in to right now, but I can afford to pay the $20 for the parts that seem to be the common problem with this set.

    The tv has been unplugged and sitting there for at least a month now, so it should be pretty safe. Like I said, I am mechanically inclined and have done a lot of soldering/de-soldering over the years, but am having a problem reading the schematics ( I have the factory repair manual in my hands) and finding the location of the parts on the board.

    Thanks,
    Brew




  • tsbrewers Jul 14, 2008

    Just a repost of what happens, I turn the tv on, I hear the sound, then 2 seconds later it shuts off. That is it.

    Thanks,
    Brew

  • tsbrewers Jul 14, 2008

    It seems to be a small click, not really a pop. It sounds just like I turned the tv off with the remote.

    When the tv worked normally, you would turn it on, the sounds would come on, then about 2 seconds later the picture would show up. Now you turn it on, the sounds comes up, then about 2 seconds later, when the picture normally shows up, it just clicks and shuts off. seems like it is going in to a protection mode of some type.

    Could you elaborate on the flyback transformer? I am not exactly sure what that is.

    Thanks,
    Brew


  • tsbrewers Jul 15, 2008

    1. Try this - hold the menu button down for 10 seconds. TV should power up; you
    will have to turn off front panel buttons on menu.

    I don't have a menu button on the tv or remote. I do have an "action" button on the remote which works as a menu button. I did try to push and hold the action button on the remote, but the tv would not turn on.




    2. You can also try a hard reset: Unplug TV from AC mains and remove all cables
    from TV. Wait about 30 minutes and replug to AC power and redo the cabling.
    Switch on the TV and see if it works..

    The tv has been unplugged for about a month, I plugged it back in and no go.





    3. Powering down the set or putting it in standby may have
    allowed the power supply to cool. Weak capacitors often go out of spec when
    they cool, thus preventing a section of the power supply from firing up
    properly again. There is a simple trick...just warm the back of the TV with a
    hair dryer for 5-7 mins after you have unplugged the TV. Look for the little
    areas of holes in the back panel of TV. Use these as your guide at where to use
    the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make
    sure the dryer is on High heat). If the TV doesn't turn on after you have
    heated it up (like it tries to come on but then turns off) you need to unplug
    the TV again, this resets it. And repeat those steps till it works. Resetting
    the TV after it fails to turn on is the key. Also, just leave the TV on. Don't
    turn in off. Since it is LCD, it doesn't take much power...only a few bucks
    extra a month for your utility bill.

    I tried the heat trick and no go. It is an older CRT RPTV, not an lcd





    4. A circuit board may crack about some of the larger
    components mounted on it. You can inspect the PCB's for fractures, and then
    repair them. It may also be poor soldering that has failed. I would be checking
    for these things first.

    I will have to pull it apart and check everything out.




    5. If you want to go in for a long term solution, you can easily replace the
    whole power board or just change the faulty capacitors. You will have to open
    the back panel and take a look. You can make out which are faulty, because
    their caps will be swollen on top. Here's a sample pic of a bust capacitor (not
    same model):





















    Check the specifications of the faulty capacitors, and get the replacements
    from your local electronics shop. If you are comfortable with this, you can use
    a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors.
    Once that is done, solder in the new capacitors carefully. If are unsure how to
    do this, try to get a friend who knows how to do this kinda stuff do it for
    you, or get a qualified technician. Warning: If you do not
    have a background in electronics repair, or are inexperienced, get a qualified
    technician to do it for you.


    I have the back open already, I will look for bad capacitors and obvious problems with the boards, solders, capacitors, etc.






    REMEMBER there are very dangerous voltages inside a TV
    that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT
    THE POWER BEFORE YOU DO ANYTHING.





    Hope that helps!





    If your issue is
    not resolved, please do not assign a rating just yet. Please post back as
    to what steps you took, results, etc, and I will try to assist you further as
    best I can. I am here at your service.






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    Thank you for using FIXYA!





    IrishDruid














    Comment by IrishDruid, posted on Jul 14, 2008
    you need to replace these Q553,c555 and c556..one is a timer and two are capacitors..

    I have these ordered, my problems is trying to find them on the boards. Hopefully if they are bad they will puffed up.


    Comment by IrishDruid, posted on Jul 14, 2008
    Well, if you have no experience, I would recommend getting in touch with a repair man..

    We will see, I can't afford a repair bill, especially on a tv this old so i want to play with it first.

    Thanks










    Thank You!



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  • tsbrewers Jul 23, 2008

    Ok, I just replaced Q553,c555 and c556, and it doesn't work yet. When I had it out, I saw no burnt areas or anything like that at all anywhere.

    Since I had to pull the front of the TV apart to get at one of the wire harnesses, I left the front off when I tried starting it back up. I can see the bulbs start to glow, but the tv "crackles" while starting to turn on then shuts off.

  • tsbrewers Jul 23, 2008

    Sorry, i didn't notice your reply for the service manual. I have the service manual here already so that isn't needed, but thanks for your offer.

  • tsbrewers Oct 08, 2008

    Ok, I just had a tv guy out and he fixed it. he replaced two convergence ic's, # C5AA00000203 for both. I also had 8 burnt resistors, didn't catch which ones, but the #'s are, ER052THF20R0, at least that is what he wrote on the receipt.

    Brew


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Is the sound a clicking sound or a small pop???

Check the flyback transformer to see if its working or tripping ?>

Posted on Jul 14, 2008

  • Rishi Roshan Ali Jul 15, 2008

    Thats them main power transformer that actuall powers the tv. its what makes the clicking sound when its activated.



    Since you hear this sound when you turn it one and when it shust off for it self means that this its ok. The tv is deffecately entering the safty mode. Meaning that when something is wrong, it shuts it self off to prevent further damages. From what you are describing its extremely difficult to say what can actually be wrong.



    You will have to do some contuinity testing leading from the power circuit straight out until you actually find the problem. It can be as minior as a capicator to major components. the convergence ics can be a cause to basically anything. I can get ou the service manual for it to attempt repairs your self but without the proper knowledge you can cause damages to your self as well as the tv. The voltages you are dealing with can kill you.

    I strongly recommend taking this tv to a certified technician , but if you wish to attempt repairs your self AT YOUR OWN RISK i can post the service manual here for you(a link to it) some places have it for free some you have to buy. The choice is yours let me know what you decide



  • Rishi Roshan Ali Jul 15, 2008

    Sir would u like a service manual ?

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1. Try this - hold the menu button down for 10 seconds. TV should power up; you will have to turn off front panel buttons on menu.

2. You can also try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works..

3. Powering down the set or putting it in standby may have allowed the power supply to cool. Weak capacitors often go out of spec when they cool, thus preventing a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key. Also, just leave the TV on. Don't turn in off. Since it is LCD, it doesn't take much power...only a few bucks extra a month for your utility bill.

4. A circuit board may crack about some of the larger components mounted on it. You can inspect the PCB's for fractures, and then repair them. It may also be poor soldering that has failed. I would be checking for these things first.

5. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic of a bust capacitor (not same model):
Panny Pt-51hx40 shuts off - ead3101.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

If your issue is not resolved, please do not assign a rating just yet. Please post back as to what steps you took, results, etc, and I will try to assist you further as best I can. I am here at your service.

P.S. - You can rate a solution with one of four ratings as explained under (remember that at times a bit of to and fro dialogue may be necessary to resolve an issue).

  • "FixYa!" - The solution provides great advice on how to solve the problem.
  • "Helpful" - The solution provides useful leads that helps solve the problem.
  • "Thanks for Trying" - The solution does not solve the problem but the effort is appreciated.
  • "Inappropriate" - The solution has absolutely nothing to do with the problem.
Thank you for using FIXYA!

IrishDruid


Posted on Jul 14, 2008

  • Swilin Sampson
    Swilin Sampson Jul 14, 2008

    you need to replace these Q553,c555 and c556..one is a timer and two are capacitors..

  • Swilin Sampson
    Swilin Sampson Jul 14, 2008

    Well, if you have no experience, I would recommend getting in touch with a repair man..

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  • 327 Answers

Honestly if you do not know what your doing i would call a repair man because if you touch one wrong thing in a tv you can fry yourself plz becareful messing around with that ...personal i would call a repairman

Posted on Jul 14, 2008

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