Trouble In H.v Sync - NEC N9902-1 Service Manual

6. TROUBLE IN H. V SYNC
TROUBLE IN
HOR. OR VER. SYNC
YES
CHECK
CONNECTOR S701
(PIN6,7), SIGNAL
YES
CHECK
U701(PIN 39,40)
H/V SYNC.
SIGNAL
YES
CHECK
U701(PIN 32,33)
H/V SYNC.
SIGNAL
YES
CHECK
U701(PIN 1, 2)
YES
TROUBLE IN
U301
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NO
NO
CHECK
U701(PIN 5)
NO
VOLTAGE
CHECK
U701 (PIN 7, 8)
YES
FREQ.12MHz
TROUBLE IN
NO H.V SIGNAL LINE
R301, R302, C706,
C301, C302
23
TROUBLE IN
SIGNAL CABLE
TROUBLE IN
H/V SYNC LINE &
Q701, Q702
NO
5V?
YES
NO
TROUBLE IN
5V LINE
TROUBLE IN
X701, U701