6-13
8.2 Checking the control circuit of vertical sync pulse
NG
Failure point
1) No separate sync output signal from the host.(Check the
host.)
2) Video cable may have failed.
3) Printed wire broke between CN1 pin 14 and U1 pin 11.
4) R10 open.
5) U1 failure
OK
Proceed section 9 “Checking the resolution
change IC movement”.
Check the vertical sync signal on U1 pin 11
at TTL level.
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