No Operation, Power Led Off - NEC MultiSync FE700 Serviceanleitung

2. NO OPERATION, POWER LED OFF

CHECK U101
PIN6 OUTPUT
POWER SW
TURN OFF
CHECK
F101
CHECK
Q101
CHECK
U101
U101 pin6
OK
POWER SW
TURN ON
DC POWER SUPPLY OUTPUT VOLTAGE SET AT 17V,
CURRENT SET AT 200mA. POSITIVE CONNECT TO
C112 "+" SIDE. NEGATIVE CONNECT TO C105 "-" SIDE.
CHECK U101
PIN 4(SAWTOOTH)
AND PIN 8(5V)
NG
OK
FAILURE
R111, ZD101
7- 3
U101 pin4
FAILURE
U101
NG