Troubleshooting - Hitachi H972 Service Manual

High resolution color display monitor
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TROUBLESHOOTING

1. Raster does not appear
Relevant circuit
: Power circuit, Horizontal deflection circuit,
High voltage limitter circuit
Check supply
Voltage AC100-200V/
AC 200-240V
Normal
Check F901
Normal
Power LED is green.
(Normal)
Yes
Horizontal drive pulse
Abnormal
Abnormal
Abnormal
(Abnormal)
No
Normal
Abnormal
Replace F901
Normal
No
The power LED
is orange.
Yes
Check +B
Others
after removing
L971
193.5+3 V
 17 
Trouble outside the monitor
Q910, Q902, I940
D901, D902, D903, D904
C901, C902, C903, C904,
C905, C907, C910, C920
(Change the DJ72 Main Board)
I940, D98A
(Change the DJ72 Main Board)
Sync. Signal input error
Refer to Item 2.
(Change the DJ72 Main Board)
Q765, Q801, I740
(Change the DJ72 Main Board)
I740, T751
(Change the DJ72 Main Board)
Sync. Signal input error
Refer to Item 2.

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