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Most of the problems with those regarding shutdown is centered around the 5V Standby to the micro. There are several caps off the 5V SB/SBF line that go bad. Most are small value - 1, 2.2 or 4.7uf - the one closest to the EEPROM went bad often.
Most of these sets had the dreaded weak CRTs - I'd make sure the CRT was good before pouring any effort into it.
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Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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