ViewSonic E70FSB-2 Service Manual - Page 15

Transistor & Diode Circuit, Location, Circuit Function Description - driver

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4-3 TRANSISTOR & DIODE CIRCUIT LOCATION D901 ~ D904 D910 D918, D919 D922 D923 D925 Q901 Q907, Q908 Q909, Q918 Q912, Q920 Q913 Q921 Q701 Q402 Q426 Q404, Q405 Q406 Q705 CIRCUIT FUNCTION DESCRIPTION Bridge Rectifier for AC Source Clamp Diode for Snubber CKT Rectifier for Output Voltage Rectifier for Output Voltage Rectifier for Output Voltage Rectifier for B+ Supply MOS FET for Switching Power Control. Use for Off-Mode to Cut-off 6.3V Supply Voltage Use for Standy-By or Suspend Mode to Cut-off 12V Supply Voltage Push-Pull Topology to Drive Q911 Degaussing Switcher Transistor 5V Regulator Transistor Turn-on at Power ON/OFF and Change Mode to Protect Hor.Block HOR. Driver Transistor Horizontal s correction control MOSFET As Differential Amp. to Drive Q406 Transistor for H-Size Control Brightness Control CKT ViewSonic Corporation 12 Confidential - Do Not Copy E70f-5_E70fB-5_E70fSB-5

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4-3
TRANSISTOR & DIODE CIRCUIT
LOCATION
CIRCUIT FUNCTION DESCRIPTION
D901 ~ D904
Bridge Rectifier for AC Source
D910
Clamp Diode for Snubber CKT
D918, D919
Rectifier for Output Voltage
D922
Rectifier for Output Voltage
D923
Rectifier for Output Voltage
D925
Rectifier for B+ Supply
Q901
MOS FET for Switching Power Control.
Q907, Q908
Use for Off-Mode to Cut-off 6.3V Supply Voltage
Q909, Q918
Use for Standy-By or Suspend Mode to Cut-off 12V Supply Voltage
Q912, Q920
Push-Pull Topology to Drive Q911
Q913
Degaussing Switcher Transistor
Q921
5V Regulator Transistor
Q701
Turn-on at Power ON/OFF and Change Mode to Protect Hor.Block
Q402
HOR. Driver Transistor
Q426
Horizontal s correction control MOSFET
Q404, Q405
As Differential Amp. to Drive Q406
Q406
Transistor for H-Size Control
Q705
Brightness Control CKT
ViewSonic Corporation
Confidential – Do Not Copy
E70f-5_E70fB-5_E70fSB-5
12