ViewSonic E70FSB-2 Service Manual - Page 22
No Blanking, 4 Hor./osc/def/hv Circuit Fault, No Raster Disconnect With Signal Cable
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6-3 NO BLANKING CHECK THE CIRCUIT OF NG OK CHECK R859 ON VIDEO CHECK G1 RELATIVE FBT PIN 4 ON MAIN CHECK THE RELATIVE OF Q601, Q707 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1. NO RASTER (DISCONNECT WITH SIGNAL CABLE) CHECK IC401 PIN 10 ABOUT 12 NG OK CHECK IC401 PIN 8 WAVE FORM ABOUT 3Vpp NG OK CHECK THE COLLECTOR OF Q402 ABOUT NG OK CHECK THE COLLECTOR OF Q403 ABOUT 1200Vpp AT NG CHECK IC401 PIN 10 RELATIVE CHECK IC401 PIN 26~29, RELATIVE CIRCUIT CHECK Q402, RELATIVE CIRCUIT CHECK TCC440H118E,,CTCK440129,T,QH440-D01,2Y,Q,TB44+0032,,CDQ440082,,D408, D408, C418, C419, H-DY, ViewSonic Corporation 19 Confidential - Do Not Copy E70f-5_E70fB-5_E70fSB-5
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6-3 NO BLANKING
NG
OK
CHECK THE
CIRCUIT OF
CHECK THE RELATIVE
CHECK G1 RELATIVE
CHECK R859 ON VIDEO
FBT PIN 4 ON MAIN
OF Q601, Q707
6-4 HOR./OSC/DEF/HV CIRCUIT FAULT
1. NO RASTER (DISCONNECT WITH SIGNAL CABLE)
NG
OK
OK
OK
NG
NG
NG
CHECK THE COLLECTOR
CHECK THE COLLECTOR
RELATIVE CIRCUIT
RELATIVE CIRCUIT
CHECK Q402,
ABOUT 3Vpp
OF Q403 ABOUT 1200Vpp
CHECK IC401 PIN 8 WAVE FORM
CHECK IC401 PIN 26~29,
CHECK IC401 PIN 10 ABOUT 12
CHECK IC401 PIN 10 RELATIVE
OF Q402 ABOUT
CHECK
T401,T402,Q402,Q403,CD408,D408,
C418,C419,H-DY,B+
Q705.
ViewSonic Corporation
Confidential – Do Not Copy
E70f-5_E70fB-5_E70fSB-5
19