No Operation, Power Led Flash - NEC MultiSync V520 Service Manual

1. NO OPERATION, POWER LED FLASH

POWER LED FLASH
POWER SW
TURN OFF
MULTIMETER TEST
Q307, Q102
D110,D111,D112,D113
CHECK
U102
U102 PIN6
PULSE O/P
POWER SW
TURN OFF
1. DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET
AT 600MA. POSITIVE CONNECT TO C130"+".
NEGATIVE CONNECT TO U102-pin 5.
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q102-GATE AND U102pin 5.
CHECK
U102 PIN 7 VCC
NO
PIN 4 SAWTOOTH
PIN 8 5V
FAILURE
R136, ZD103
32