Most of the time on most electronic equipment, this symptom is caused by the power supply circuit. If you open the unit and check the caps on the power board and the are swollen or burnt looking this is probably what is causing the auto shut off. Goggle your model number and if your lucky you will find the caps to replace. A DIY person can fix this for a few bucks. Take it to a repair shop for 100 TO $150.
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