The TV may do nothing, cycle on and off for a while, power up and then
shutdown in an endless cycle - or at least for a while. Then it comes
on and operates normally until it is turned off.
|NotTaR of Television Sets : TV doesn't power up immediately
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A couple of possibilities:
- The main filter capacitor or other filter capacitors in the low voltage
power supply is dried up and this can cause all kinds of regulation
- The power supply regulator is defective (or marginal) allowing excessive
voltage on its output and then the X-ray protection circuitry shuts
If you can get access to a Variac, it would be worth bringing up the input
voltage slowly and seeing if there is some point at which it would stay on.
If there is, then if the picture has serious hum bars in it the main filter
cap could be bad. If more or less a decent picture with minor hum bars then
it could be the regulator.