Acer AC511 SERIES Service Manual - Page 13

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Acer AC511 SERIES Service Manual
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6.TROUBLE SHOOTING CHART

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
CHECK MAIN PCB POWER SUPPLY
70V, 15V, 80V
NG
OK
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 23.5 ~ 25.5KV
NG
OK
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
NG
OK
CHECK SCREEN VOLTAGE ABOUT
400V TO 600V
LESS THAN 300V
OK
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOLTAGE
NG
OK
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 60V TO 70V
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"
12
OK