ViewSonic E70FSB-2 Service Manual - Page 19

Trouble Shooting Flow Chart

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6. Trouble Shooting Flow Chart 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CCSHUHEPECPCKLKYM5M7A.A5INIVN,P1C4VBP,C8PB0OVWEPROWER 53V, 14V, 80V NG OK CHECK THE HIGE VOLTAGE OF CCHRETCAKBOUTT2H4E.5~26.5HKIVGE OF CRT ABOUT 25.5 ~ NG OK CHECK THE VOLTAGE OF HEATER ABOUT 6.3V NG OK CHECK SCREEN VOLTAGE 400V TO 600V LESS THAN 300V OK BRIGHTNESS SET TO MAX. CHECK CRT G1 VOLTAGE NG OK CHECK VOLTAGE OF THE CATHODE ABOUT 65V TO NG CHECK POWER SAVING H-SYNC, V-SYNC Q909, OK REFER ITEM S.M.P.S. CHECK FAILSAFE CKT PIN 25 RELATIVE CKT. CHECK CRT'S HEATER CIRCUIT Q907, CHECK FBT CHECK BRIGHTNESS CIRCUIT QC7H05ECRKELATIVE BCRKITG.HTNESS Q705 RELATIVE CKT. REFER ITEM 6-2 "ABNORMAL ViewSonic Corporation 16 Confidential - Do Not Copy E70f-5_E70fB-5_E70fSB-5

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6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
REFER ITEM S.M.P.S.
BRIGHTNESS SET TO MAX.
CHECK CRT G1 VOLTAGE
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
CHECK THE VOLTAGE OF
HEATER ABOUT 6.3V
CHECK VOLTAGE OF THE
OK
CHECK POWER SAVING
"ABNORMAL
H-SYNC, V-SYNC
CHECK SCREEN VOLTAGE
LESS THAN 300V
CHECK FBT
CHECK FAILSAFE CKT
Q909,
CHECK CRT'S HEATER
CIRCUIT Q907,
PIN 25 RELATIVE CKT.
400V TO 600V
REFER ITEM 6-2
CATHODE ABOUT 65V TO
CHECK MAIN PCB POWER
SUPPLY 57.5V,14V,80V
CHECK THE HIGE VOLTAGE OF
CRT ABOUT 24.5~26.5KV
CHECK BRIGHTNESS CIRCUIT
Q705 RELATIVE CKT.
6. Trouble Shooting Flow Chart
ViewSonic Corporation
Confidential – Do Not Copy
E70f-5_E70fB-5_E70fSB-5
16