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6.TROUBLE SHOOTING CHART
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
1.ABNORMAL POWER SUPPLY
NG
OK
NG
OK
NG
OK
LESS THAN 300V
OK
NG
OK
NG
CHECK POWER SAVING CIRCUIT
Q909,Q910
90V,12V
CHECK MAIN PC BOARD
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 23.5 ~ 25.5KV
CHECK FAILSAFE CKT Q402,Q403
RELATIVE CKT.
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK CRT’S HEATER
RELATIVE CIRCUIT Q907,Q908
CHECK SCREEN VOLTAGE
ABOUT 400V TO 600V
RELATIVE CKT.
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOLTAGE
CHECK FBT. D706,R723,C713
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 60V TO 70V
CHECK BRIGHTNESS CIRCUIT
Q703,Q704,Q705 RELATIVE CKT.
REFER ITEM 8-2
“ABNORMAL DISPLAY”
Page
12
of
59
4V SERIES MANUAL
05.06.2002
file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V
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C551.htm