Http://tv.manualsonline.com/manuals/mfg/palsonic/pdp4225hd.html
Free manual - see if contact information is available for the manufacturer of the
Palsonic PDP4225HD Flat Panel Television
http://tv.manualsonline.com/manuals/mfg/palsonic/pdp4225hd.html
There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.
The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.
If the power supply is not working check teh SMPS unit.
Check for tips to look into the SMPS unit:
http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies
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