RCA P52753AT Big Screen TV Power Supply...

Discussion in 'Electronic Repair' started by jsandlin, Nov 30, 2006.

  1. jsandlin

    jsandlin Guest

    I got a big screen tv from a family member. They said that it would
    work but it would lose color and go to black and white sometimes. I
    plugged it in when i got it home and the power light came on and
    blinked a couple of times, then went out. I then tried it again and the
    same thing happened. It done this about 5 times before it stopped and i
    smelled that familiar electronic burning smell.

    I opened the back up and could see that a resistor was burnt on the
    right side board, but that can't be the main problem. I can hear a
    clicking sound on the power supply board when i plug the power cable
    in. It only happens for a few seconds and then quits until i unplug the
    power cord, wait a minute or so, and plug it back in. Is this a rely
    clicking like that?

    Please help. I would like to get this going.

    Thanks
    Jason
     
    jsandlin, Nov 30, 2006
    #1
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  2. "jsandlin" <> wrote in message
    news:...

    > I opened the back up and could see that a resistor was burnt on the
    > right side board, but that can't be the main problem. I can hear a
    > clicking sound on the power supply board when i plug the power cable
    > in. It only happens for a few seconds and then quits until i unplug the
    > power cord, wait a minute or so, and plug it back in. Is this a rely
    > clicking like that?


    Probably the SMPS cycling against a short.
     
    Homer J Simpson, Nov 30, 2006
    #2
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  3. jsandlin

    jsandlin Guest

    Is there a part number that i can look for? What does the SMPS look
    like?


    THanks
    Jason




    Homer J Simpson wrote:
    > "jsandlin" <> wrote in message
    > news:...
    >
    > > I opened the back up and could see that a resistor was burnt on the
    > > right side board, but that can't be the main problem. I can hear a
    > > clicking sound on the power supply board when i plug the power cable
    > > in. It only happens for a few seconds and then quits until i unplug the
    > > power cord, wait a minute or so, and plug it back in. Is this a rely
    > > clicking like that?

    >
    > Probably the SMPS cycling against a short.
     
    jsandlin, Nov 30, 2006
    #3
  4. "jsandlin" <> wrote in message
    news:...

    > Is there a part number that i can look for? What does the SMPS look
    > like?


    If it's a short replacing the SMPS won't help.
     
    Homer J Simpson, Nov 30, 2006
    #4
  5. jsandlin

    Dave Guest

    "jsandlin" <> wrote in message
    news:...
    > Is there a part number that i can look for? What does the SMPS look
    > like?
    >
    >

    SMPS stands for switch-mode power supply. It's not a component or board,
    it's a series of components on the main pcb. TV's contain protection
    circuits which detect incorrect current and/or voltage situations at various
    points in the TV circuitry. What's likely happening is:

    1. You turn the TV on
    2. The logic portion of the TV (low voltage) closes the main AC relay which
    powers up the flyback and rest of the circuits (high voltage).
    3. One of the protection devices senses an out-of-spec condition and sends
    a message back to the microprocess.
    4. The multiprocessor shuts down the set.

    Truly I mean no offense here, but the likelihood of your being able to fix
    this set yourself with the skill level you exhibit in your postings is
    incredibly small.

    SMPS power supplies and the HV portion of your TV set have voltages that can
    kill you (think 30,000V). There are charges built up in various capacitive
    components which can hurt you badly even if the set is not plugged in.

    Take it to a qualified repair shop.

    Just my 2 cents.

    Dave
     
    Dave, Nov 30, 2006
    #5
  6. jsandlin

    David Naylor Guest

    jsandlin wrote:
    > I got a big screen tv from a family member. They said that it would
    > work but it would lose color and go to black and white sometimes. I
    > plugged it in when i got it home and the power light came on and
    > blinked a couple of times, then went out. I then tried it again and the
    > same thing happened. It done this about 5 times before it stopped and i
    > smelled that familiar electronic burning smell.
    >
    > I opened the back up and could see that a resistor was burnt on the
    > right side board, but that can't be the main problem. I can hear a
    > clicking sound on the power supply board when i plug the power cable
    > in. It only happens for a few seconds and then quits until i unplug the
    > power cord, wait a minute or so, and plug it back in. Is this a rely
    > clicking like that?
    >
    > Please help. I would like to get this going.
    >
    > Thanks
    > Jason
    >

    Ohhhhhhhhhhhh this is a common problem on that vintage tv, Those in
    the know will know what I mean you have a convergance amp failure
    proberbly several of the con amp tranistor on the con amp board are
    shorted, burn't a couple of resistors.. this is what is shutting down
    your set. take it from the pros like us and take it to a good shop. the
    light box come right of that set just bring that , and be prepared to
    shovel out some large somes of cash projo's are not cheap to fix
     
    David Naylor, Dec 1, 2006
    #6
  7. jsandlin

    tem00 Guest

    I have the same unit. Mine was the main power supply (SMPS) with a
    blown HOT (horizontal output transistor,) shorted HV Splitter (the
    thing behind in the front panel that has all the big red wires going to
    it,) and some bad caps in the SMPS that were causing the voltage to
    ride too high in the first place.

    I bought the repair kit from http://www.tritronicsinc.com and got it
    going. Unfortunately, I messed up the convergence and it is a real
    pain to readjust and I gave up on it for a while. I'm spoiled by the
    newer sets where you do it from the remote in service mode.

    Sounds like you have other problems to boot and I don't know about
    those factors. You can
    buy a service manual and try and track the problem down but the time
    may not be worth it.

    Good Luck



    jsandlin wrote:
    > I got a big screen tv from a family member. They said that it would
    > work but it would lose color and go to black and white sometimes. I
    > plugged it in when i got it home and the power light came on and
    > blinked a couple of times, then went out. I then tried it again and the
    > same thing happened. It done this about 5 times before it stopped and i
    > smelled that familiar electronic burning smell.
    >
    > I opened the back up and could see that a resistor was burnt on the
    > right side board, but that can't be the main problem. I can hear a
    > clicking sound on the power supply board when i plug the power cable
    > in. It only happens for a few seconds and then quits until i unplug the
    > power cord, wait a minute or so, and plug it back in. Is this a rely
    > clicking like that?
    >
    > Please help. I would like to get this going.
    >
    > Thanks
    > Jason
     
    tem00, Dec 3, 2006
    #7
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