HITACHI CMP420E
Manual de Servicio

5. Trouble shooting
5.1 Trouble Shooting of Plasma Monitor
Power can not be turned on (LED is not light)

Is the input voltage applied to the AC/DC Power unit ? (CN61 �, �) Yes

No

AC inlet

Power switch

AC Fuse F901 T6.3AH 250V

FILTER PWB

Are Voltage applied to pins ��,�(PW01) of the Signal PWB � +12V � +6V � +4.5V � GND Signal PWB

No

Yes

AC/DC Power unit

Picture is displayed. But no sound

Are Voltage applied to pins � (PVA) of the Audio PWB � +22�28V � GND

No

Yes

AC/DC Power unit No

Are Signal applied to pin �� and �� (PVA1)of the Audio PWB

Yes Are

Signal PWB

there signals on Speaker Terminals

No

Yes

Audio PWB

Speaker

5