Checking The Interface Circuit Of Sync Signal; Checking The Control Circuit Of Horizontal Sync Pulse - Mitsubishi E55LCD Service Manual

6. Checking the interface circuit of sync signal

6.1 Checking the control circuit of horizontal sync pulse

Check the horizontal sync signal on IC202 pin1 at
TTL level.
NG
OK
Check the hovizuntal sync signal on IC401 pin141
a TTL level.
NG
OK
Procees section 7 "Checking the resolution change
IC movement".
1) No separate sync or composite sync
output by host. (Confirm the host,
output the sync signal.)
2) Video cable may have failed.
3) Printed wire broke between J201
pin 13 and IC202 pin1.
4) L208 or R213 open.
5) IC202 failure.
Failure point
IC401 failure.
6-9
Failure point