7-6
LCD Backlight Block Diagram
L01711BLLB
BA
CK
LIGHT
CN401
2
1
O
V
ER V
O
LT
A
G
E
PR
O
T
ECT
OR
Q419,Q420
BA
CK
LIGHT
CN402
O
V
ER CURRENT
PR
O
T
ECT
OR
Q404
PWM
CONT
OR
OL
Q410
BA
CKLIGHT
-ADJ
OV
E
R
V
O
LT
A
G
E
PR
O
T
ECT
OR
Q405
+
Q408
Q407
+12V
SWITCHING
Q427
BA
CKLIGHT
-SW
Q403
PR
O
TECT
-1
MAIN CB
A
AL+12V
Q406
T
O
SYSTEM CONTR
O
L
BLOCK DIA
GRAM
SWITCHING
Q401
T401
T402
2
O
V
ER V
O
LT
A
G
E
PR
O
T
ECT
OR
Q421,Q422
1
2
5
1
6
7
8
9
10
3
4
2
5
1
6
7
8
9
10
3
4
BA
CK
LIGHT
CN403
2
1
O
V
ER V
O
LT
A
G
E
PR
O
T
ECT
OR
Q423,Q424
BA
CK
LIGHT
CN404
LCD MODULE
T403
T404
2
O
V
ER V
O
LT
A
G
E
PR
O
T
ECT
OR
Q425,Q426
1
2
5
1
6
7
8
9
10
3
4
2
5
1
6
7
8
9
10
3
4
SWITCHING
BA
CKLIGHT
-ON
SWITCHING
Q411,Q412
SWITCHING
Q415,Q416
Q409
WF32
WF32
WF32
WF32
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
