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Q4 is probably shorted, and maybe the driver for Q4, also check any Zener diodes tied to a voltage output check all capacitors with an ESR meter and replace as indicated. Then plug in to AC with a 40 Watt light bulb (incandescent) in series to keep from damaging any more parts. If it lights up full bright you still have a short. If it lights up a little and immediately fades out then it's probably fixed. That's how I recall fixing many of those back in the day but it's been almost 20 years.
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