No Blanking; Hor./Osc/Def/Hv Circuit Fault - Acer AF715 Series Service Manual

CHECK THE RELATIVE
CIRCUIT OF BLANKING
NG
OK
CHECK IC801 PIN11 VIDEO PCB,CHECK
CHECK IC801 PIN 16 ON VIDEO PCB,
G1 RELATIVE CIRCUIT
Q702,Q703,Q704,C711,C712 CHECK G1 RELATIVE CIRCUIT
Q705, R718, C707 ON MAIN PCB
1. NO RASTER (DISCONNECT WITH SIGNAL CABLE)
CHECK IC401 PIN 10 ABOUT 11.5 VDC
NG
OK
CHECK IC401 PIN 8 WAVE FORM
ABOUT 10Vpp
NG
OK
CHECK THE DRAIN VOLTAGE OF
CHECK THE COLLECTOR VOLTAGE
Q409 ABOUT 40Vpp
OF Q402 ABOUT 40Vpp
NG
OK
CHECK THE COLLECTOR
CHECK THE COLLECTOR VOLTAGE
VOLTAGE OF Q410 ABOUT 900Vpp
OF Q403 ABOUT 1100Vpp AT FH:31KHz
AT FH:31KHZ
NG

6-3 NO BLANKING

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

18
CHECK THE RELATIVE CIRCUIT OF
CHECK THE RELATIVE CIRCUIT
D424,R497,ZD404 ON MAIN PCB
OF C433, D410, R635, R636, IC105
ON MAIN PCB
CHECK IC401 PIN 10 RELATIVE CIRCUIT
CHECK IC401 PIN 26 ~ 31
RELATIVE CIRCUIT
CHECK Q409,T401 RELATIVE
CHECK Q402, T401
CIRCUIT
RELATIVE CIRCUIT
CHECK Q410,D412,C424,H-DY
CHECK T401, T402, Q402, Q403,
Q408,R449
D408, C418, C419, H-DY