TOSHIBA SD-270EKE3
Manual de Servicio

1-3 All output voltages on the power board is 0V or deviated.

Trouble shooting chart

All output voltages on the power board is 0V or deviated Yes

Check whether F1 is blown

Yes Replace F1

No

Check

whether

No

Replace C1&C2 if D1, D2, D3, D4 are normal.

there is 300V on C1

Yes

Check whether 100KHz oscillating signal on Pin6 of U1

No

Check/ replace U1. U1(PIN 3 - RC waveform) U1(PIN 8 - Drain waveform)

Yes

Check if +5V, , +12V and -12V are short.

No Check whether U1 are eroded.

Yes Check whether the components in the short-circuit voltage are defected or eroded.