Trouble shooting chart | |
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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
F501 is blown
No
Check whether there is
300V on C501 or C502.
Yes 
Check whether 100KHz oscillating signal on Pin4 of U1
Yes
Yes
No
No
Replace F501
Replace C501&C502 if D501, D502, D503, D504 are normal.
Check/ replace U1.
U1(PIN 4 - Drain waveform)
Check if +5V and +12V are | No |
short. |
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Yes |
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Check whether the components in the |
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Check whether U1 are eroded.
