Dell E773c Series User Manual

14
6.TROUBLE SHOOTING CHART
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOL
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
CHECK THE HIGE VOLTAGE OF CRT
A
BOUT 24 ~ 26KV
CHECK THE VOLTAGE OF CR
T
HEATER ABOUT 6.3V
CHECK VOLTAGE OF THE CRT
CHECK BRIGHTNESS CIRCUIT
OK
CHECK POWER SAVING CIRCUIT,
H-SYNC, V-SYNC SIGNAL
Q909, Q910
"ABNORMAL DISPLAY"
CHECK SCREEN VOLTAGE ABOUT
LESS THAN 300V
CHECK FBT
CHECK MAIN PCB POWER SUPPL
Y
55V, 12V, 80V,-12.5V
CHECK FAILSAFE CKT IC401
PIN 25 RELATIVE CKT
.
CHECK CRT'S HEATER RELATIVE
CIRCUIT Q907, Q908
Q703, Q704, Q705 RELATIVE CKT.
400V TO 600V
REFER ITEM 6-2
CATHODE ABOUT 55V TO 65V
REFER ITEM S.M.P.S

Dell E773c Series Specifications

General

Brand	Dell
Model	E773c Series
Category	Monitor
Language	English