Sharp LC-15AV7U Service Manual - Page 35

LCD Backlight Block Diagram, A7121BLLB

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LCD Backlight Block Diagram NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD. MAIN CBA TO POWER SUPPLY BLOCK DIAGRAM INV+22V Q401 SW+22V Q407 SWITCHING TO SYSTEM CONTROL BLOCK DIAGRAM BACKLIGHT-ADJ Q405 SWITCHING Q404 OVER VOLTAGE PROTECTOR Q406 +10V REG. Q424 SWITCHING Q421 CURRENT CONTROL SWITCH T401 3 9 6 10 1 4 5 8 2 7 CN401 1 2 Q422 OVER VOLTAGE PROTECTOR BACK LIGHT 8-7 Q464 SWITCHING Q461 CURRENT CONTROL SWITCH Q425 OVER CURERENT PROTECTOR T403 3 9 6 10 1 4 5 8 2 7 Q462 OVER VOLTAGE PROTECTOR CN403 1 2 BACK LIGHT LCD MODULE A7121BLLB

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8-7
LCD Backlight Block Diagram
A7121BLLB
CURRENT
CONTROL
SWITCH
Q421
Q424
T401
CN401
LCD MODULE
BACK
LIGHT
BACK
LIGHT
OVER VOLTAGE
PROTECTOR
Q422
1
2
CN403
1
2
INV+22V
9
7
3
5
2
6
1
4
10
8
TO
POWER
SUPPLY
BLOCK
DIAGRAM
MAIN CBA
CURRENT
CONTROL
SWITCH
Q461
Q464
T403
OVER VOLTAGE
PROTECTOR
Q462
9
7
3
5
2
6
1
4
10
8
OVER VOLTAGE
PROTECTOR
Q404
Q406
+10V REG.
OVER CURERENT
PROTECTOR
Q425
Q405
SWITCHING
SWITCHING
SWITCHING
BACKLIGHT-ADJ
Q401
SW+22V
TO SYSTEM
CONTROL
BLOCK
DIAGRAM
SWITCHING
Q407
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.