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.
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.
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:
If it falshes ten times that is code formotherboard on your brand tv there will be a failing capacitator,or resistor on there
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
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.
falling capacitor or resistor can be replaced easily.....
it will cost around $50 - 75
it will cost around $50 - 75
it will cost around $50 - 75
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Greetings,
How long before it goes to stand-by ? Every 5, 10, 15 minutes pattern or random ?
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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.
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
if a failing capasitator or resistor.Can that be fixed easily?
thanks for your help
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