No Raster - NEC MultiSync V720 Service Manual

5. NO RASTER

NO RASTER
YES
CHECK
B+
YES
CHECK
U301 PIN 3, U402 PIN 4
H/V SYNC
YES
CHECK
U301 PIN 7, U402 PIN 23,24
H/V SYNC
YES
CHECK
T301 PIN 3 VOLTAGE
56V, 68V(AT H-FREQ.
31.5KHz)
YES
CHECK Q307
COLLECTOR ABOUT
1050Vp-p
YES
CHECK G1
VOLTAGE ABOUT
-45~65V
YES
PROBLEM IN
G2 VOLTAGE
NO
NO
NO
U102,Q102,D114,D111,L102
NO
NO
NO
36
POWER SUPPLY
CHECK
PROBLEM IN
MCU U701
PROBLEM IN
U301, U402
PROBLEM IN
OR DEFLECTION YOKE
PROBLEM IN
Q307, Q308,T302, D307,
D308, Q309, Q325
PROBLEM IN
Q305, Q306, ZD303
D318, T301, C344