it's very likely the PSU itself.
Check the PSU with shortcut of PIN 20 (component side) and at the same
position below X (bottom side) of the PSU board.
These two connectors have to be shortcut; that's the trick to get the PSU
work in stand-alone-mode
Measure PIN 13up to18 = Ground
with
PIN 20 5V Standby
PIN 19 -5V
PIN 11or12 +5V
PIN 9or10 +12V
and at the bottom side PIN W (the 4th from right side) = -12V
Be careful: High Voltage !
greetings TOM from Bavaria
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