Hitachi CMP4121HDE Service Manual page 6

Picture is not displayed (LED is lighting)
Is the LED red or
green/orange
green/orange
Is it the power
saving mode?
No
Do the Fans
rotate?
Yes
Is Voltage
of the pin ⑥ (CN68)
on the AC/DC Power
unit 5V
Yes
Are Voltages
of the pin ①､⑩(CN64)
on the AC/DC Power
unit collect ?
Yes
① +50～70V
⑩ +75～90V
⑥ GND
Panel Module
red
Yes
Input signal Cable
or Signal PWB
No
Is pin① of
CN304 and PFAN1
7V more?
Yes
DC Fan
No
AC/DC
Power unit
No
6 6 6 6
Are
Voltage
applied to pins ⑦ (PW01)
of the Signal PWB
Yes
Signal PWB
No
AC/DC Power
unit or Signal
PWB
Is Voltage
of the pin ① (CN68)
on the AC/DC Power
unit collect ?
Yes
① +3V
③ GND
AC/DC
Power unit
No
AC/DC
⑦ +6V
Power unit
⑨ GND
No
Panel
Module