ViewSonic E70FSB-2 Service Manual - Page 21
Abnormal Display, No Signal On Screen
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UPC - 766907870558
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6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT NG OK CHECK THE OUTPUT VOLTAGE OF IC801 PIN 19, 20, 21 AT NG OK CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT NG OK CHECK THE VOLTAGE OF CATHODE ABOUT NG OK CHECK THE VOLTAGE OF FBT ABOUT 400V TO LESS THAN 400V EXCEED 700V CHECK THE 12V PIN OF P802 CHECK THE RELATIVE OF IC801 PIN 10 Vcc CIRCUIT CHECK THE 80V RELATIVE OF SMPS ON MAIN CHECK THE RELATIVE CIRCUIT CHECK FBT RELATIVE CHECK FBT & CRT RELATIVE OR REFER ITEM ViewSonic Corporation 18 Confidential - Do Not Copy E70f-5_E70fB-5_E70fSB-5
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6-2 ABNORMAL DISPLAY
1.NO SIGNAL ON SCREEN
CHECK FBT RELATIVE
LESS THAN 400V
OK
NG
NG
OK
OK
NG
OK
NG
CHECK THE OUTPUT VOLTAGE
CHECK THE B+ VOLTAGE OF
CHECK THE VOLTAGE OF
CATHODE ABOUT
CHECK T
E VOLTAGE OF FBT
CHECK THE RELATIVE
CHECK THE 12V PIN
OF SMPS ON MAIN
RELATIVE CIRCUIT
OF P802
ABOUT 400V TO
EXCEED 700V
CHECK FBT & CRT RELATIVE
CHECK VIDEO IC801 VCC ABOUT
OF IC801 PIN 19, 20, 21 AT
CHECK THE
OF IC801 PIN 10
Vcc CIRCUIT
OR REFER ITEM
VIDEO PCB ABOUT
CHECK THE 80V RELATIVE
ViewSonic Corporation
Confidential – Do Not Copy
E70f-5_E70fB-5_E70fSB-5
18