Question about Panasonic PT-50LCX63 50" Rear Projection Television

6 Answers

TV turns on with sound&pic then shuts of lamp&on/off blink red

Tv turns on normally, then without reason turns off with blinking red lamp indicator and red blinking on/off button. After a short break, tv turns on again with picture and sound ok, cycle conintues. Checked lamp, rebuilt model installed 9 months ago last year, filament good, lens good. Vacuumed rear electronics. Two visible fans working, but never turn off even when lamp is cold. Fans turn off only when plug is pulled out of wall. Thermal unit on lamp housing looks ok visually. Not sure what is going on. Any ideas?

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  • Peter Cermak Jan 31, 2009

    Yavier,



    Thank you for your reply, I have need of more insight. You say that a component on the power supply board is overheating. I am not sure how this is happening, or if this is occuring. Hear me out just a bit... The tv is off and stone cold. The back panel is off, all the dust is gone, and the three fans that I can see are running. They do not turn off right now. There is a large 5 inch fan on the far right, one 3 inch fan next to where the power chord enters the rear, and on flat on top of the rear plug in panel. The air temp is 68 degrees in the house and with all that, when I turn on the tv, within 20 seconds of seeing a picture, it shuts off - snap. It seems to me that there is not enough time for anything to overheat. I can even touch the lamp casing cause it doesn't get time to heat up. Does this change your analysis of the problem, or can the board heat up instantly causing this sudden shut off? Thanks for your patience. Let me know if this information changes anything.

  • Peter Cermak Feb 01, 2009

    It has been suggested that my television is shutting down because a component on the power board is overheating. I hope you can read my earlier postings, He is a summary again: When I turn on my tv, within 60 seconds, sound, picture on, channel selection functioning, it shuts off. I checked the rear area, cleaned out the dust, three visible fans running ok, everything cool. When it shuts off, the red lamp blinks and the power button blinks red as well. When I turn it on, the power button turns green again and the lamp warning turns off. Can a component overheat in 50 seconds? Any other ideas? Thanks

  • Peter Cermak Feb 01, 2009

    Hey Guys, looks like it is off to the M. Emco repair dude down the road. At least we have some sense of direction to go on. Will let you know what the final outcome is for future reference. Thanks, Peter

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6 Answers

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  • Plug a lamp into the outlet to make sure it is live. If the lamp works, then the problem is the TV. It not, the outlet is defective or the fuse is blown or the circuit breaker is tripped. There is another very simple explanation that is sometimes overlooked: This is a switched outlet. You always wondered what that wall switch was for that didn't seem to do anything and you flipped randomly. :-) Well, now you know!
  • Try wiggling the TV's cord both at the outlet (also push the wire toward the plug) and TV (also push the cord toward the TV) with the set on and/or while pressing the power-on button. If you can get a response, even momentarily, the cord likely has broken wires internally.
Beyond these basic causes, troubleshooting will be needed inside the set todetermine what is defective. Also see the section:Intermittently dead set - bad cordset.

Posted on Feb 01, 2009

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  • mohammed marika thambi
    mohammed marika thambi Feb 01, 2009

    posistor is a combination of a PTC (positive temperature coefficient)
    resistor and another resistor-element to heat it up and keep it hot.
    Sometimes, these will go by the name posister or thermistor. The heater
    is a disk shaped resistor across the power line and the themister
    is a disk shaped device in series with the degauss coil. They are in
    clamped together to be in close contact thermally. You can pry off the
    lid and see for yourself.

    The most common failure mode is for the part to short across the line.


    Its function is to control degauss, so the only thing you lose when you
    remove one of these is the degauss function on power-on. When you turn
    the TV or monitor on, the PTC resistor is cold and low resistance. When
    heated, it becomes very high resistance and turns off the degauss coil
    but gradually - the current ramps down to zero rather than being abruptly
    cut off..



  • mohammed marika thambi
    mohammed marika thambi Feb 01, 2009


    • A low voltage power transformer feeding one or more sets of rectifiers,
      filter capacitors, and possibly regulators.

      A power surge could cause the primary of the transformer to open up.
      There may also be a thermal fuse under the outer layers of insulation
      which blew either due to overheating or a power surge. However, if the
      primary is open, it is best to replace the transformer rather than
      attempting repair it.




    • One or more voltage dividers connected directly to the AC line feeding
      rectifiers, filter capacitors, and possibly regulators.

      Open resistors and dried up capacitors are common failures since the
      resistors are often not rated adequately and run hot, in close proximity
      to the capacitors.




    • A portion of the main (switchmode) power supply that runs all the time.

      Failures could be almost anything that would affect normal operation of
      the power supply as well as problems with the control circuitry.



  • mohammed marika thambi
    mohammed marika thambi Feb 01, 2009


    • Deflection yoke - since the horizontal coils are part of the horizontal
      flyback circuit, there could be problems running without a yoke. This
      could be anything from it appearing totally dead to an overheating or
      blown horizontal output transistor. There may be no problems. Vertical
      and any convergence coils may or may not be problems as well.



    • CRT video Driver board - pulling this should not usually affect anything
      except possibly video output and bias voltages.



    • CRT 2nd anode - without the CRT, there will be no capacitor to filter
      the high voltage and you would certaily want to insulate the HV connector
      **real** well. I do not know whether there are cases where damage to
      flyback could result from running in thie manner, however.



    • Front panel controls - disconnecting these may result in inability to
      even turn the set on, erratic operation, and other unexpected behavior.



    • Degauss - you just won't have this function when disconnected. But who
      cares - you are not going to be looking at the screen anyhow.


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I think your chipset diode trnsistor or register is gone.i think it is beeter adviced to call tchnical person to change those blown thing.also check your power supply waltage and earthing problem.may be if u connect more than 1 device to powersupply this problem occurs. so try to turn your tv with opther power supply bord in your home.Best of luck.

Posted on Feb 01, 2009

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If the tv is in warranty get it replaced.as it the board problem.

Posted on Jan 31, 2009

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Do you have service manual of your PT-50LCX63 TV?
You can have it from Manual Zone for small fee to check circuits.
Blinking lamp and standby light is error sign, Please count blinks and check in service manual as it has details about error codes and suggestions where fault can be.

Posted on Jan 31, 2009

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Hi and welcome to FixYa,

Offhand, it could be the relay at the power supply board. You can try to verify by listening closely for the clicking sound when the unit turns on or off. Either the relay contacts are pitted/burned and would need replacement or the driver transistor of the relay has cold solder issues. In some instances, it could be the filter capacitor of the B+ to the relay that needs looking into.

Good luck and thank you for using FixYa.

Posted on Jan 31, 2009

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Its due to any of the component on the main power supply board getting overheated.just do not use the tv till it get rep[aired as it will damage the board as if you will use it .

Posted on Jan 31, 2009

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