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Panasonic Viera TV switiching itself off

My Panasonic Viera TV - Model TH-42PV30 keeps switching itself off. A red light next to the on/off switch blinks 5 times continuously with a opause between each sequence of 5 blinks. While this is happening the remote does not work. I switch off at the wall, and switch on again 30 min later, but it only stays on for around 5 min and switches off again with the 5 blinking lights. Any solution? Thanks, Mike

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  • msphotograph Dec 28, 2008

    The TV I am having the trouble with is NOT a "projection" TV (as indicated in your reply to me) It is a Progressive Plasma TV - Model No. TH-37PA30. Panasonic Viera. Thanks, Mike

  • msphotograph Jan 03, 2009

    Thank you. The TV has since righted itself without any action, however your advice will come in handy if the problem occurs again. Mike

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Hi and welcome to FixYa,

Initially, the "switching itself off" would be a reaction as the unit has kicked into protective mode. The built-in diagnostic has sensed the fault, auto shutdown and displayed the error codes (5 blinks). 5 blinks would indicate possible fault in the:

  • loss of +5VDC at the SOS D board; or
  • SW PC Board P/N TNPA2841AH.
This of course would require opening the unit, perform voltage measurements,determine faulty component and subsequent part(s) replacement. Further, a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron would be required. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings.Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional or claim warranty if the unit is new.

Good luck and Thank you for using FixYa.

Posted on Dec 28, 2008

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What type of tv is this, plasma, lcd or flat panel?

Posted on Dec 28, 2008

  • Stephen Evans Dec 31, 2008

    I did not imply projection

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Check the 2 main interconnection cables (24pin and 26pin) rear of PDP and Tuner box.
Make sure they are firmly connected. (Loose connection of 24pin will cause no power
on symptom.)

Posted on Dec 28, 2008

  • 2 more comments 
  • blueextc3221
    blueextc3221 Dec 28, 2008

    "Technically speaking, this is part of a protection circuit that shuts down the PDP if any of the working voltages dip below 75% of their nominal value.
    This particular problem is due to the shutdown circuit being too anxious to do its job.

  • blueextc3221
    blueextc3221 Dec 28, 2008

    repair the TV, replacing modules 5 and 7

  • blueextc3221
    blueextc3221 Dec 28, 2008

    A closer inspection will result in you seeing the word proTection... not proJection.

  • blueextc3221
    blueextc3221 Dec 28, 2008

    its a known fault, and any reliable tech will know it right away.

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The 5 blinks on this model and chassis would be due to a defective "D board". The 5 volts are not working properly causing the TV not to turn ON.
I would suggest to contact Panasonic to see if they can provide you with the board to fix your plasma or if the plasma is less then a year old, still under manufacturers warranty.

Posted on Dec 28, 2008

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