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ViewSonic Corporation E90fB-4
17
Confidential-Do Not Copy
6.TROUBLE SHOOTING 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
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,Q935
CHECK CRT'S HEATER RELATIVE
CIRCUIT Q907, Q935
Q705 RELATIVE CIRCUIT
.
OF CRT ABOUT 25.5~ 26.5KV
400V TO 600V
REFER ITEM 6-2
200V, 14V, -12V,7V,80V
CATHODE ABOUT 56V TO 65V
Summary of Contents for PerfectFlat E90fB-4
Page 46: ...ViewSonic Corporation E90fB 4 43 Confidential Do Not Copy 9 BLOCK DIAGRAM...
Page 48: ...ViewSonic Corporation E90fB 4 45 Confidential Do Not Copy SAA4849...
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Page 58: ...ViewSonic Corporation E90fB 4 55 Confidential Do Not Copy 11 PCB LAYOUT 11 1 MAIN PCB LAYOUT...
Page 59: ...ViewSonic Corporation E90fB 4 56 Confidential Do Not Copy 11 2 CRT BOARD LAYOUT...