Sharp LC-20AV7U Service Manual - Page 34
LCD Backlight Block Diagram
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A7144BLLB 8-7 NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD. TO POWER SUPPLY BLOCK DIAGRAM INV+22V Q401 SW+22V Q407 SWITCHING TO SYSTEM CONTROL BLOCK DIAGRAM BACKLIGHT-ADJ Q405 SWITCHING Q406 +10V REG. Q404 OVER VOLTAGE PROTECTOR Q424 SWITCHING Q421 CURRENT CONTROL SWITCH T401 3 9 6 10 1 4 5 7 2 8 Q444 SWITCHING Q441 CURRENT CONTROL SWITCH T402 3 9 6 10 1 4 5 7 2 8 INVERTER CBA Q464 SWITCHING Q461 CURRENT CONTROL SWITCH Q425 OVER CURERENT PROTECTOR T403 3 9 6 10 1 4 5 7 2 8 CN401 1 2 BACK LIGHT Q422,423 OVER VOLTAGE PROTECTOR CN402 1 2 BACK LIGHT Q442,443 OVER VOLTAGE PROTECTOR CN403 1 2 BACK LIGHT Q462,463 OVER VOLTAGE PROTECTOR LCD MODULE LCD Backlight Block Diagram
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8-7
LCD Backlight Block Diagram
A7144BLLB
CURRENT
CONTROL
SWITCH
Q421
Q424
T401
CN401
LCD MODULE
INVERTER CBA
BACK
LIGHT
BACK
LIGHT
BACK
LIGHT
OVER VOLTAGE
PROTECTOR
Q422,423
1
2
1
2
CN402
CN403
1
2
9
8
3
5
2
6
1
4
10
7
CURRENT
CONTROL
SWITCH
Q441
Q444
T402
OVER VOLTAGE
PROTECTOR
Q442,443
9
8
3
5
2
6
1
4
10
7
CURRENT
CONTROL
SWITCH
Q461
Q464
T403
OVER VOLTAGE
PROTECTOR
Q462,463
9
8
3
5
2
6
1
4
10
7
OVER VOLTAGE
PROTECTOR
Q404
Q406
+10V REG.
OVER CURERENT
PROTECTOR
Q425
Q405
SWITCHING
SWITCHING
SWITCHING
SWITCHING
INV+22V
TO
POWER
SUPPLY
BLOCK
DIAGRAM
BACKLIGHT-ADJ
Q401
SW+22V
TO SYSTEM
CONTROL
BLOCK
DIAGRAM
SWITCHING
Q407
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.