This is typical when the set is old as 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. http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies http://www.fixya.com/support/r6055091-slow_start_up_circuit_cold_starting Use good soldering tips to have the dry points resoldered
Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points. Please find below two links for tips on poor start ups, as if the set is totally failed the SMPS might be faulty.
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