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VIEWSONIC CORPORATION
Confidential - Do Not Copy
P76f+-2G
17
6. Trouble Shooting Flow Chart
6-1-1 No Raster, CRT Relative Circuit Problems
REFER ITEM S.M.P.S.
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOLTAGE
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
CHECK THE HIGE VOLTAGE
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK VOLTAGE OF THE CRT
CHECK BRIGHTNESS CIRCUIT
Q705 RELATIVE CIRCUIT.
OK
CHECK POWER SAVING CIRCUIT,
"ABNORMAL
H-SYNC, V-SYNC SIGNAL
CHECK SCREEN VOLTAGE ABOUT
LESS THAN 300V
CHECK FBT
CHECK MAIN PCB POWER SUPPLY
CHECK IC101 PIN18 OUTPUT
Q907,Q908,Q909,Q910
CHECK CRT'S HEATER RELATIVE
CIRCUIT Q907, Q908
.
OF CRT ABOUT 24.5~ 25.5KV
400V TO 600V
REFER ITEM 6-2
56V, 14V, 79V,7V(80V FROM FBT)
CATHODE ABOUT 56V TO 65V
Summary of Contents for VS11262
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