LG 31MU97 Service Manual page 21

R1608
TP1600 Close to IC
WLED_ENABLE 1K
R1605 R1614 C1604
0 100K 1000pF
50V
GND_LED GND_LED
R1610
TP1602
A_DIM 68K
C1602
R1617
R1612
68pF 22K
100K
50V 1%
R1618
GND_LED GND_LED
0
5%
GND_LED
<31 inch> WHITE 2014.05.27
RISET = 2480 / ILED JH.SHIN
When ILED = 136mA,
RISET = 18.33K
OPT
R1619
0
GND_LED
GND_LED
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
LED DRIVER
Copyright © 2014 LG Electronics Inc. All rights reserved.
Only for training and service purposes
+19V
WHITE LED DRIVER
(135mA/55.4V)
L1603
33uH
IC1601 C1619 C1614 C1622
10uF 10uF
1uF
DT1643S [EP]GND
25V 25V
50V
C1606 C1610
1uF 1uF GND_LED
50V VIN VREF2 25V
1 16
D Q1602
AOD478
R1613
C1608 VREF1 NDRV
5.6
2 15 G
1uF
S
25V
EN CS
3 14
PDIM COMP
4 13 R1636
0.1
R1620 R1622
RISET RT 39K 1.5K
5 12 R1627
1.5K
C1624 GND_LED
GND_LED 4700pF
LS1 OVP
OPT
6 11 C1618
0.47uF
LS2 LS4
7 10 GND_LED GND_LED
LGND LS3
8 9
R1628 R1630
270K 270K
1% 1%
C1612
R1624
1000pF
24K 1%
50V
GND_LED GND_LED
2014.06.24
OPT->APPLY
C1605
R1629
1uF
100K
50V
C1626
33uF
GND_LED
R1631 100V
C1607
2014.06.24
1uF
100K
50V
GND_LED GND_LED GND_LED
R1607
0
JP1600 JP1601 JP1602 JP1604 JP1605
GND_LED
P1600
12507WR-06L
RIGHT Side
Downward
Analog dimming
+5V +5V
R1600 R1602
1K
10K 1%
R1603
1%
2K
A_DIM
Q1600
R1601 C
WLED_ADIM 4.7K
B OPT
R1604
C1600
2K
1% 1uF
E
10V
MMBT3904(NXP)
D1601
SK510B_TSC
R1640
WLED_ENABLE 1K
R1606
0
GND_LED
R1642
A_DIM 68K
R1644
100K
GND_LED
<31 inch> WHITE
RISET = 2480 / ILED
When ILED = 136mA,
RISET = 18.33K
C1601 C1603
33uF 33uF
100V 100V
GND_LED GND_LED
L1600
BLM18PG121SN1D
L1601
BLM18PG121SN1D
L1602
BLM18PG121SN1D
L1604
BLM18PG121SN1D
L1605
BLM18PG121SN1D
L1606
BLM18PG121SN1D
GND_LED GND
WHITE LED DRIVER
(135mA/55.4V)
IC1603 C1620
10uF
Close to IC DT1643S
[EP]GND
25V
C1634 C1638
1uF 1uF
50V VIN VREF2 25V
1 16
R1646 C1632
100K 1000pF
C1636 VREF1 NDRV
50V 2 15
1uF
25V
GND_LED EN CS
3 14
PDIM COMP
4 13
R1652 R1654
RISET RT 39K 1.5K
5 12
GND_LED
LS1 OVP
6 11
C1630 R1649
68pF
22K
LS2 LS4
50V 1% 7 10
GND_LED LGND LS3
R1650
8 9
0
R1660
GND_LED 270K
2014.05.27
JH.SHIN
C1640
R1656
1000pF
24K
50V
GND_LED GND_LED
GND_LED
2014.06.24
OPT
R1609
0
R1621
0
GND_LED
JP1606 JP1607 JP1608 JP1610 JP1611
GND_LED
P1601
12507WR-06L
LEFT Side
UPward
UHD MODEL
LED DRIVER
+19V
L1607 D1603
SK510B_TSC
33uH
C1642 C1650
10uF
1uF
25V
50V
GND_LED
Q1604
D
AOD478
R1611
5.6
G
S
R1668
0.1
R1659
1.5K GND_LED
C1652
4700pF
OPT
C1646
0.47uF
GND_LED GND_LED
R1662
270K
2014.6.6
Change OVP setting
16K->24K
2014.06.09
OPT->APPLY
C1609
R1632
1uF
50V 100K
C1613 C1615 C1616
33uF 33uF 33uF
R1633 100V 100V 100V
C1611
1uF 100K
50V
GND_LED GND_LED GND_LED GND_LED GND_LED
2014.2.14
6 18
LGE Internal Use Only