Question about Panasonic Projection Televisions

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My tv goes into stand by mode when watching.the red light flashes and i can't do anything please help its driving me crazy justspent a lot of money we didn't have on this!

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  • markydoon Jul 20, 2008

    its a panasonic th-42px7a plasma. it completely randomly goes into stand by mode when watching.The red light flashes 10 times then pauses and keeps going like that.I can't switch it back on by remote or on button on tv.

  • markydoon Jul 20, 2008

    Its not overheating it can happen sometimes after only 5 mins of being switched on. Or sometimes after many hours.Theres no pattern to it at all

  • markydoon Jul 21, 2008

    if a failing capasitator or resistor.Can that be fixed easily?

  • markydoon Jul 27, 2008

    thanks for your help

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There are two main type Electrolytic , and Non electrolytic.

Electrolytic Capacitors often fail with no external signs showing, but if the black plastic sleeving is shrinking away from the top, or the sides are wrinkled, then they are getting HOT, either by internal heat generation or by something nearby getting hot.
my tv goes into stand - 1387cb9.jpg
You can detect errors with a capacitance meter, and a ESR meter (effective series resistance)
If you do not have an ESR meter you may use a 400v 470nf cap in series with a multimeter (on the AC volts range).
Reading good working sets will give you a feel of what a good cap may read for your meter/cap and then when you meet a bad one you will see the difference.
You can also have an oscillscope to look at the waveform (idealy a flat line)

Sometimes if the fault happens after the set is warm, and is not mechanical (dry joints) then let the set get hot (10 mins) and carefully touch the tops of all the electrolytic caps to see if any are hotter than usual.

Posted on Jul 21, 2008

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From description you provided that the red light flashes 10 times.It means that the defected area is in the P-BOARD which has the reading of test point =170v, P-board is a power supply board ,bad regulation of the incoming voltage could cause the issue and maybe there is a capacitor across the incoming line which dry up or leaky already and cause the problems ,change it out with one identical rating.
Also Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the TV turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....If i have helped,please click fixya.It is the only way i get paid for my work...

Good luck:

Posted on Jul 20, 2008

  • LORETO LACARON
    LORETO LACARON Jul 21, 2008

    Yes it can easly be fixed,because that is an ordinary semiconductor,if you know the resistance and micofarad value.Find a technician to do repair for you or take to a repair shop find a good one.You probably have to pay $50.

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If it falshes ten times that is code formotherboard on your brand tv there will be a failing capacitator,or resistor on there

Posted on Jul 20, 2008

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Hi,
I would suggest, donnot keep it on, and get the same checked at the repair centre. The problem is with the power supply on the system. Its giving you warning signals , otherwise you risk a motherbaord failure, that would be an expensive part to replace.


Thanks
proton

Posted on Jul 20, 2008

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In my openion, your tv goes to stand-by mode due to over heat/ temp. problem.
You should contact proper service center to fix it because big screen tv has more complicated circuits and high voltages inside and qualified technician knows all about it. Your own safty comes first before opening such big screen tv.
If you know basic electronics, then goahead.

Posted on Jul 20, 2008

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  • 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.

Posted on Jul 19, 2008

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Greetings,

How long before it goes to stand-by ? Every 5, 10, 15 minutes pattern or random ?

Keep us posted and thank you for using our service.
FixYa for all your troubleshooting needs.

Posted on Jul 19, 2008

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