Blanking; Hor./Osc/Def/Hv Circuit Fault - Tatung VM5ERDA Service Manual

CHECK THE RELATIVE
CIRCUIT OF BLANKING
OK
CHECK C836, R859 ON VIDEO PCB,
CHECK G1 RELATIVE CIRCUIT
FBT PIN 5 ON MAIN PCB
1. NO RASTER (DISCONNECT WITH SIGNAL CABLE)
CHECK IC401 PIN 29 ABOUT 11.5 VDC
NG
OK
CHECK IC401 PIN 26 WAVE
FORM ABOUT 11.5Vpp
OK
CHECK THE COLLECTOR VOLTAGE
OF Q402 ABOUT 30Vpp
NG
OK
CHECK THE COLLECTOR VOLTAGE
OF Q403 ABOUT 1250Vpp AT FH:31KHz
NG
6-3 NO BLANKING
NG

6-4 HOR./OSC/DEF/HV CIRCUIT FAULT

NG
CHECK THE RELATIVE CIRCUIT
OF Q601 & Q707 ON MAIN PCB
CHECK IC401 PIN 29 RELATIVE CIRCUIT
CHECK IC401 PIN 4 ~ 7, PIN 13
RELATIVE CIRCUIT
CHECK Q402, T401
RELATIVE CIRCUIT
CHECK T401, T402, Q402, Q403,
D408, C418, C419, H-DY, B+