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(1) Backlight & LCD power Control
Backlight control and LCD power control can be performed by PSC2 Register control or by SM722G4 control.
*1 : Control signal from PSC2
*2 : Control signal from SM722G4
15. INVERTER CIRCUIT
CN501A
VLOW
2
COLOR
1
VHIGH
SM02B-BHSS-1-TB
CCFL
The UP-5900 employs the LT1184 made by Liner Technology for control of brightness (analog control).
The LT1184 detects a current flowing through the low voltage side to vary the switching duty of VSW pin, controlling so that a constant current may
flow through the CCFL.
The current flowing through the CCFL can be varied by controlling the current flowing between REF and ICCFL pin of the LT1184.
In the UP-5900, VR1 on the main PWB is operated to change the current flowing between REF and ICCFL pin, controlling the current flowing through
the CCFL and adjusting the brightness.
C504A
22pF/3.15KV
IC501A
1
16
PGND
VSW
2
15
ICCFL
BULB
3
14
DIO
BAT
4
13
VC
ROYER
5
12
AGND
VIN
6
11
SHDN
REF
7
10
NC
NC
8
9
NC
NC
LT1184
R502A
C602A
4.7K
1uF/16V
VR1
22K VR
R501A
1
3
13K
+
C501A
R602A
C603A
2.2uF/50V
220K
1000pF
R601A
100K
D601A
SFPB54
+
C503A
10uF/16V OS
D602A
SFPB54
Inverter pwb
UP-5900VS CIRCUIT DESCRIPTION
5 – 37
10
6
T501A
841TN-1157
5
1
4
3
2
R604A
C601A
2.2K
0.082uF/100V
Q601A
Q602A
D2391
D2391
L501A
100uH
CN502A
+12V
1
SHUTDOWN-
2
VR2-1
VR2-1
3
VR2-2
VR2-2
4
GND
5
53015-0510
V R1
R296
20K VR
2
20KF
GNDP
GNDL
VR2
2
200K VR
F601A
ICP0.5
MAIN pwb
+ C502A
R603A
22uF/16V
2.2K
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