No Raster - Mitsubishi DPLUS 74SB -BKA Service Manual

5. NO RASTER

NO RASTER
YES
CHECK
B+
YES
CHECK
U302 PIN 14, 15
H/V SYNC
YES
CHECK
U302 PIN 18, 19, 8
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
U302, Q319, D335, L304
NO
OR DEFLECTION YOKE
NO
NO
6-6
POWER SUPPLY
CHECK
PROBLEM IN
MCU U701
PROBLEM IN
U701, U302
PROBLEM IN
PROBLEM IN
Q307, Q308, T302,
D307, D308
PROBLEM IN
Q305, Q306, D318
T301, C344