Read LG 42SL90QD-DA (CHASSIS:LT91L) Service Manual online
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
POWER
+5V_ST
+3.3V_ST
+3.3V_AVDD_MPLL
+3.3V_ST
L803
BLM18PG121SN1D
C805
0.1uF
16V
0.1uF
16V
C811
0.1uF
16V
0.1uF
16V
C821
0.1uF
16V
0.1uF
16V
C810
100uF
100uF
16V
IC801
AP1117E33G-13
2
OUT
3
IN
1
ADJ/GND
C825
0.1uF
0.1uF
16V
0.1uF
C803
16V
OPT
C819
0.1uF
16V
OPT
+5V_ST
INV_CTL
R811
10K
10K
R808
0
OPT
R820
10K
10K
Q802
2SC3052
E
B
C
C820
1uF
25V
25V
OPT
R805
6.8K
OPT
6.8K
OPT
+5V_ST
L800
BG2012B080TF
A_DIM
001:V16
4.7K
R812
R803
100
100
R802
4.7K
4.7K
OPC_OUT1
ERROR_OUT
C822
0.1uF
50V
OPC_OUT2
R819
22
22
OPT
PWM_DIM
C804
OPT
R801
22
22
Scanning
R821
10K
OPT
L805
BG2012B080TF
R818
22
OPT
R815
10K
OPT
+24V
C817
0.1uF
50V
R813
10K
10K
C814
0.1uF
50V
+12V
C816
0.1uF
0.1uF
16V
C
8
4
0
0
.
1
u
F
+1.26V_VDDC
C843
5.6nF
50V
5.6nF
50V
+5V_ST
+5V_GENERAL
C888
0.1uF
16V
0.1uF
16V
C842
10uF
OPT
+5V_GENERAL
L822
CIC21J501NE
R827
10K
OPT
C852
10uF
16V
C865
0.47uF
25V
IC805
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
C878
22uF
22uF
16V
R856
9.1K
R833
22K
R837
12K
1%
+3.3V
R857
12.4K
12.4K
1%
IC808
MP2305DS
3
SW
2
IN
4
GND
1
BS
5
FB
6
COMP
7
EN
8
SS
L816
BLM18SG121TN1D
R843
9.1K
1/10W
5%
R823
10K
C841
10uF
16V
16V
+3.3V
C875
22uF
16V
22uF
16V
3216
R844
22K
1/10W
1%
L813
3.6uH
NR8040T3R6N
R824
120K
OPT
0.1uF
C859
C832
0.1uF
C835
22uF
22uF
C849
0.1uF
16V
OPT
C846
0.1uF
0.1uF
C831
10uF
10V
+1.8V_MEMC
L823
CIC21J501NE
C858
0.1uF
0.1uF
C861
10uF
16V
16V
L817
CIC21J501NE
C855
0.1uF
16V
0.1uF
16V
L810
CIC21J501NE
L809
3.6uH
NR8040T3R6N
R845
10K
1/16W
R854
56K
1%
1%
R829
10K
R850
0
L819
22uH
22uH
R836
15K
1%
C860
22uF
22uF
R846
300K
300K
1/8W
1%
R834
22K
R826
100K
100K
R847
390K
1/8W
1%
1/8W
1%
IC804
MP2305DS
3
SW
2
IN
4
GND
1
BS
5
FB
6
COMP
7
EN
8
SS
+5V_GENERAL
C853
0.1uF
16V
0.1uF
16V
R825
10K
R
8
5
3
1
0
0
K
C857
10uF
R832
22K
1/10W
1%
IC807
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
C889
0.1uF
16V
0.1uF
16V
C839
0.1uF
16V
16V
R841
10K
1/16W
OPT
C856
22uF
16V
22uF
C884
16V
C874
5.6nF
50V
PANEL_POWER
L811
CIC21J501NE
L815
BLM18PG121SN1D
C850
0.1uF
R828
10K
10K
L808
22uH
22uH
C851
22uF
16V
C862
OPT
Q803
2SC3052
E
B
C
C877
0.1uF
0.1uF
16V
R830
560
+5V_GENERAL
R849
10K
1/16W
OPT
R835
15K
1%
+12V
+3.3V_ST
+12V
GND
PANEL_CTL
001:AK10
R831
75K
75K
1/8W
1%
Q804
2SC3052
E
B
C
C838
0.01uF
25V
+3.3V_MEMC
Q805
2SC3052
2SC3052
E
B
C
+5V_ST
C837
OPT
C854
22uF
22uF
16V
L812
CIC21J501NE
POWER_ON/RL_ON
+5V_USB_SIDE
C890
22uF
16V
16V
+5V_TUNER
C886
0.1uF
16V
0.1uF
16V
C872
0.1uF
16V
C883
22uF
16V
22uF
16V
OPT
3216
C809
0.1uF
16V
0.1uF
16V
+3.3V
L820
BLM18PG121SN1D
+3.3V_AVDD
C808
10uF
10uF
6.3V
L821
BLM18PG121SN1D
C830
0.1uF
16V
0.1uF
16V
C829
10uF
6.3V
6.3V
+1.8V_MEMC
+1.8V_AMP
0.1uF
C887
L825
BLM18SG121TN1D
+1.26V_MEMC
+1.26V_VDDC
C882
10uF
10uF
6.3V
+1.8V_DDR
0.1uF
C885
+1.8V_MEMC
C879
10uF
10uF
6.3V
L824
BLM18SG121TN1D
+3.3V
R800
10K
0.1uF
C801
OPT
C802
100uF
16V
OPT
C813
100uF
16V
OPT
0.1uF
C807
OPT
Q807
RSR025P03
S
D
G
Q808
RSR025P03
S
D
G
C891
0.1uF
C892
22uF
OPT
R838
10
1/16W
5%
R848
10
1/16W
5%
POWER_ON/RL_ON
R814
120K
120K
OPT
R809
10K
R810
0
OPT
R804
33K
OPT
R817 0
Q801
RT1P141C-T112
1
2
3
R807
10K
RL_ON_3.3V_PULL_UP
L801
BLM15BD121SN1
Q806
2SC3052
E
B
C
+5V_ST
+3.3V_ST
R806
10K
C812
15pF
15pF
50V
+3.3V_ST
R840
47K
R839
47K
C844
1uF
25V
R855
0
POWER_ON/OFF1
POWER_ON_DELAY
R858 0
R822 0
POWER_ON/RL_ON
R816 0
C845
1uF
25V
C848
1uF
25V
OPT
C873
1uF
25V
C834
4.7uF
10V
OPT
C836
4.7uF
10V
OPT
L804
MLB-201209-0120P-N2
L806
MLB-201209-0120P-N2
L807
MLB-201209-0120P-N2
P800
FM20020-24
19
N.C
14
12V
9
5.2V
4
GND
18
24V
13
12V
8
5.2V
3
GND
17
24V
12
GND
7
5.2V
2
Power ON
16
GND
11
GND
6
GND
1
N.C
20
Inverter ON
15
GND
10
5.2V
5
GND
21
A.Dim
22
Error out
23
PWM_DIM2
24
PWN_Dim1
25
C800
0.1uF
16V
0.1uF
16V
C806
10uF
16V
16V
R851
0
C876
0.1uF
50V
C847
0.1uF
50V
R842
0
C833
0.1uF
C868
0.1uF
50V
0.1uF
50V
L802
BLM18PG121SN1D
L814
BLM18PG121SN1D
L826
BLM18PG121SN1D
C827
68uF
35V
35V
C823
68uF
35V
35V
C826
68uF
68uF
35V
C828
68uF
35V
C5008
560pF
560pF
OPT
C5009
560pF
560pF
OPT
L818
BLM18PG121SN1D
+5V_OPTICAL
Stand-by +3.3V
EAX61268901_SL80
8 11
POWER
2009.04.23
$0.048
Replaced Part
FROM LIPS & POWER B/D
C1130
$0.07
415 mA @85% efficiency
Placed on SMD-TOP
MAX 3A
400 mA + 600 mA
For Power Sequence about PSU
Replaced Part
$0.22
$0.22
3A, DCR=0.025 ohm
About 1.84V
PI Result
S6 1.26V Core
Close to IC
PANEL_POWER
Close to IC
+1.8V_DDR
Close to IC
Close to IC
Vout=0.923*(1+R1/R2)
R1
R2
Vout=0.8*(1+R1/R2)
+1.8V_MEMC for DDR
1600 mA
$0.07
R1
R1
R2
C OUT
C OUT
Vout=0.923*(1+R1/R2)
C IN
Placed on SMD-TOP
Placed on SMD-TOP
Vout=0.8*(1+R1/R2)
650 mA
465 mA @85% efficiency
Placed on SMD-TOP
Replaced Part
4.9A 0.0150OHM 34MHZ
R2
700 mA @85% efficiency
C IN
R1
MEMC +1.26V Core
233 mA
4.9A 0.0150OHM 34MHZ
R2
rev 0
320 mA
+3.3V_AVDD
50 mA
3A, DCR=0.025 ohm
3A, DCR=0.025 ohm
450 mA
rev 1
rev 1
rev 1
rev 1
rev 1
rev 1
USB & TUNER +5V
+5V_GENERAL
+3.3V
SMD-TOP
SMD-BOTTOM
$0.082
$0.052
$0.052
$0.23
$0.23
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