Trouble In H. V Sync - Mitsubishi DPLUS 74SB -BKA Service Manual

6. TROUBLE IN H. V SYNC

PROBLEM IN
HOR. OR VER. SYNC
YES
CHECK
CONNECTOR S702
(PIN4, 5), SIGNAL
YES
CHECK
U701 (PIN 40,39)
H/V SYNC.
SIGNAL
YES
CHECK
U701 (PIN 32,33)
H/V SYNC.
SIGNAL
YES
CHECK
U302 PIN 14, 15
YES
PROBLEM IN
U302
NO
NO
CHECK
U701 (PIN 5)
NO
VOLTAGE
5V?
YES
CHECK
U701 (PIN 8)
NO
FREQ.12MHz
YES
PROBLEM IN
U701
6-7
PROBLEM IN
SIGNAL CABLE
PROBLEM IN
H/V SYNC LINE &
Q301, Q401
NO
NO
PROBLEM IN
5V LINE
PROBLEM IN U203
12V, 80V VOLTAGE