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All output voltages on the power board is 0V or deviated.
All output voltages on
the power board is 0V or
deviated
Yes
Check whether
F1 is blown
No
Check
whether
there is 300V on C4.
Yes
Check whether 100KHz
oscillating
signal
Pin6 of U1
Yes
Check if +5V, +3.3v, +12V,
-12V and -24V are short.
Yes
Check whether the components in the
short-circuit voltage are defected or eroded.
Yes
No
Replace C4, if D1, D2, D3, D4
are normal.
No
on
No
4-3
Replace F1
Check/ replace U1.
U1(PIN 3 - RC waveform)
Check whether U2 are eroded.
Trouble shooting chart
U1(PIN 8 - Drain waveform)
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