Trouble Shooting Chart - Dell E773c Series Service Manual

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
CHECK MAIN PCB POWER SUPPLY
55V, 12V, 80V,-12.5V
OK
CHECK THE HIGE VOLTAGE OF CRT
ABOUT 24 ~ 26KV
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 VOL
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
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"
14
OK
.