Hitachi H972 Service Manual page 19

High resolution color display monitor
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5. Color does not appear
Relevant circuit : Video amplifier circuit
Check
the input signal.
Normal
Check
the voltage of 12V
Normal (12V)
Check the
voltage of I201
24 pin
Normal (1.5~4.0V)
Check
the voltage of I202
1 pin
Normal (30~75V)
Note : Trouble in the blue circuit is shown in this diagram as representative color.
Refer to : when green does not appear, and when red does not appear.
Abnormal
0V
Abnormal
Check
the voltage of I201
18 pin
Normal (2~3V)
0V
Abnormal
Check the
voltage of I301
13 pin
Normal (0~5V)
 19 
Trouble outside the
character monitor
D975, I971
(Change the DJ72 Main Board)
Abnormal
I301, I101
I203, Q281, Q282
(Change the DJ72 Video Board)
I201,I101
(Change the DJ72 Video Board)
I202
(Change the DJ72 Video Board)
I203, Q22B
(Change the DJ72 Video Board)

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