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 THE 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