Table of Contents
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
CHECK MAIN PCB POWER SUPPLY
53V, 14V, 78V
OK
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 24.5 ~ 25.5KV
OK
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
OK
CHECK SCREEN VOLTAGE ABOUT
400V TO 600V
OK
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOLTAGE
OK
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 55V TO 65V
6.TROUBLE SHOOTING CHART
NG
NG
NG
LESS THAN 300V
NG
NG
CHECK POWER SAVING CIRCUIT,
H-SYNC, V-SYNC SIGNAL
Q909, Q910
OK
REFER ITEM S.M.P.S.
CHECK FAILSAFE CKT IC401
PIN 25 RELATIVE CKT.
CHECK CRT'S HEATER RELATIVE
CIRCUIT Q907, Q908
CHECK FBT
CHECK BRIGHTNESS CIRCUIT
Q703, Q704, Q705 RELATIVE CKT.
REFER ITEM 6-2
"ABNORMAL DISPLAY"
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Troubleshooting
