Sync Trouble - Mitsubishi Electric DPro930SB-BK Service Manual

6. H. V. SYNC TROUBLE
TROUBLE WITH
HOR OR VER SYNC
YES
CHECK
CONNECTOR S701
(PINS 1, 2), SIGNAL
YES
CHECK
U701 (PINS 39,40)
H/V SYNC
SIGNAL
YES
CHECK
U701 (PINS 32,33)
H/V SYNC
SIGNAL
YES
CHECK
U502 PINS 14, 15
YES
TROUBLE IN
U501
NO
NO
U701 (PIN 5)
NO
VOLTAGE
U701 (PINS 7, 8)
YES
FREQ12MHz
NO
H. V. SIGNAL LINE
R507, R508, C521, C522
TROUBLE IN
SIGNAL CABLE
TROUBLE IN
H/V SYNC LINE &
Q701, Q702
CHECK
5V?
YES
CHECK
TROUBLE IN
6-9
TROUBLE IN
NO
5V LINE
TROUBLE IN
NO
X701, U701