Abnormal Auto Adjustment - NEC MultiSync LCD1550V Service Manual

6. Abnormal Auto adjustment

Check the input of pulse from U3 pin 49 ~ 61, 67 ~75.
NG
OK
Proceed section 9 "Checking the resolution change IC movement".
Check the output of pulse from U6 pin 3, 4, U7 pin 3, 4, 7, 8, 13, 14, 17, 18.
OK
Check the output of
NG
pulse from U3 pin
49 ~ 61, 67 ~75
1) Printed wire broke between U6 pin 2, 5 and U8 pin 2, 30.
2) Printed wire broke between U7 pin 2, 5, 6, 9, 12, 15, 16, 19 and
U8 pin 13~15, 17 ~ 21.
OK
Failure point
6-10
Failure point
(1) Printed wire broke between
U6 pin 3,4 and U3 pin 49,
50.
(2) Printed wire broke
between U7 pin 3, 4, 7, 8,
13, 14, 17, 18 and U3 pin
51 ~ 58, 67 ~ 75.