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6-2 ABNORMAL DISPLAY
NO SIGNAL ON SCREEN
NG
OK
NG
OK
NG
OK
NG
OK
LESS THAN 400V
EXCEED 600V
6-3 NO BLANKING
NG
OK
CHECK VIDEO IC VCC ABOUT 8V
CHECK THE 12V PIN
OF P802 CONNECTOR
CHECK THE OUTPUT VOLTAGE
OF IC801 PIN 13,15,18 ABOUT 3Vpp
CHECK THE RELATIVE CIRCUIT
OF Q813,Q814 & IC801
CHECK THE B+ VOLTAGE OF
VIDEO PCB ABOUT 75V
CHECK THE 80V RELATIVE
CIRCUIT OF SMPS ON MAIN PCB
OF Q813,Q814 & IC801
CHECK THE VOLTAGE OF CRT
CATHODE ABOUT 40Vpp
CHECK THE IC802
RELATIVE CIRCUIT
CHECK THE VOLTAGE OF FBT
SCREEN ABOUT 400 TO 600V
CHECK CRT RELATIVE
CIRCUIT OR REFER ITEM 7-1
CHECK FBT RELATIVE
CIRCUIT
CHECK THE RELATIVE CIRCUIT
OF Q601 & Q707 ON MAIN PCB
CHECK THE RELATIVE
CIRCUIT OF BLANKING
CHECK C836,R859 ON VIDEO PCB,
CHECK G1 RELATIVE CIRCUIT
FBT PIN 5 ON MAIN PCB
Page
16
of
59
4V SERIES MANUAL
05.06.2002
file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V
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C551.htm