DOWNLOAD LG 26LH20D (CHASSIS:LB91A) Service Manual ↓ Size: 5.08 MB | Pages: 67 in PDF or view online for FREE

Model
26LH20D (CHASSIS:LB91A)
Pages
67
Size
5.08 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
26lh20d-chassis-lb91a.pdf
Date
PREV: LG 26LH20 (CHASSIS:LA92A) Service Manual

LG 26LH20D (CHASSIS:LB91A) Service Manual ▷ View 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.
LVDS
C608
220uF
16V
R629
22
26"UP_HD
R619
2K
1/10W
R616
0
OPT
LVDS_BC-
OPC_OUT
R630
0
OPT
PWM_DIM
OPC_OUT
R615
0
OPT
C609
1000pF
50V
PANEL_POWER
PWM_DIM
L607
CB3216PA501E
22"UNDER
LVDS_BC+
R611
0
FHD
LVDS_B1-
LVDS_B2-
PANEL_POWER
LVDS_B0+
LVDS_B1+
R628
0
OPT
R627
0
26"UP_HD
LVDS_B3-
R614
0
FHD
R622
2K
1/10W
R626
0
26"UP_HD
R613
22
FHD
R612
0
LVDS_B3+
PANEL_POWER
LVDS_B2+
LVDS_B0-
C610
0.1uF
L606
CB3216PA501E
26"UP_HD
LVDS_B1+
LVDS_B0-
LVDS_BC-
LVDS_BC+
LVDS_B0+
LVDS_B3+
LVDS_B2+
LVDS_B3-
LVDS_B2-
LVDS_B4+
LVDS_B4-
LVDS_B1-
LVDS_A3-
LVDS_A4+
LVDS_AC-
LVDS_A0+
LVDS_A2-
LVDS_A1-
LVDS_A1+
LVDS_AC+
LVDS_A3+
LVDS_A4-
LVDS_A0-
LVDS_A2+
+3.3V
R618
0
OPT
BIT_SEL
R617
3.3K
FHD
R625
22
+3.3V
R624
0
OPT
LVDS_SEL
R623
2.2K
OPT
R621
0
OPT
OPC_EN
+3.3V
LVDS_B0+
LVDS_B2-
LVDS_B1+
LVDS_B3-
LVDS_BC+
LVDS_B1-
LVDS_B0-
LVDS_B3+
LVDS_B2+
LVDS_BC-
P602
TF05-51S
FHD
1
VLCD
2
VLCD
3
VLCD
4
VLCD
5
NC
6
GND
7
GND
8
PANEL_AGP
9
GND
10
GND
11
.
12
.
13
.
14
.
15
GND
16
R2CLKP
17
R2CLKN
18
GND
19
.
20
.
21
.
22
.
23
.
24
.
25
BIT_SEL
26
GND
27
.
28
.
29
.
30
.
31
GND
32
R1CLKP
33
R1CLKN
34
GND
35
.
36
.
37
.
38
.
39
.
40
.
41
GND
42
OPC_EN
43
OPC_OUT
44
P_DIM
45
LVDS_SEL
46
NC
47
NC
48
NC
49
NC
50
NC
51
GND
52
.
P954
FF10001-30
22"UNDER_HD
1
VLCD_5V
2
VLCD_5V
3
VLCD_5V
4
VLCD_5V
5
VLCD_5V
6
GND
7
GND
8
GND
9
NC
10
NC
11
NC
12
GND
13
.
14
.
15
GND
16
CLKP
17
CLKN
18
GND
19
.
20
.
21
GND
22
.
23
.
24
GND
25
.
26
.
27
GND
28
NC
29
PWM_OUT
30
NC
31
.
P603
FF10001-30
26"UP_HD
1
GND
2
GND
3
PWM_DIM
4
OPC_OUT
5
GND
6
.
7
.
8
GND
9
CLKP
10
CLKN
11
GND
12
.
13
.
14
GND
15
.
16
.
17
GND
18
.
19
.
20
GND
21
OPC_EN
22
LVDS_SEL
23
GND
24
GND
25
GND
26
GND
27
VLCD
28
VLCD
29
VLCD
30
VLCD
31
.
R632
0
R631
2.2K
OPT
+3.3V
PANEL_AGP
R620
510
OPC
EAX59793902(0)
6    11
   2009.01.31
AUS_LH20/LH35
****LVDS_SEL****
High:JEIDA
Low/NC:VESA
****************
For LH20_LH35 MP
EAX59793902(0)_AUS_MERCURY
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.
HDMI
HDMI3_SDA
002:E13;007:AL16
JP707
R729
0
FHD
R701
2K
JP708
R708
22
HDMI3_SDA
HDMI2_CLK-
JK703
EAG42463001
FHD
14
13
5
D1_GND
20
JACK_GND
12
11
2
D2_GND
19
18
10
CK+
4
D1+
1
D2+
17
9
D0-
8
D0_GND
3
D2-
16
7
D0+
6
D1-
15
R717
0
CEC_REMOTE
007:X6;007:AG23;007:AL6
HDMI1_SCL
R720
22
GND
JP703
HDMI3_RX0-
002:E12
GND
HDMI1_RX1+
002:D8
HDMI2_RX1+
002:D10
D704
ENKMC2838-T112
A
1
C
A
2
5V_HDMI_1
R733
22
FHD
R704
0
R722
0
IC701
AT24C02BN-10SU-1.8
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
R702
0
HDMI2_RX2+
002:D11
5V_HDMI_3
HDMI3_CLK+
002:E12
HDMI2_SCL
HDMI1_SDA
002:D9;007:J16
IC703
AT24C02BN-10SU-1.8
FHD
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
EDID_WP
HDMI1_CLK+
002:D7
HDMI2_RX2-
002:D11
GND
JP706
JP704
R705
0
C705
0.1uF
HDMI2_SDA
HDMI1_RX0-
002:D8
D706
ENKMC2838-T112
FHD
A
1
C
A
2
HDMI3_SCL
CEC_REMOTE
007:J6;007:X6;007:AG23
5V_HDMI_2
R707
22
R728
2K
FHD
JP702
HDMI2_SCL
R730
0
FHD
HDMI3_RX0+
002:E12
HDMI3_SCL
002:E14;007:AL16
HDMI3_RX1+
002:E13
C701
0.1uF
16V
R731
0
FHD
JP701
+5V_ST
R714
0
C707
0.1uF
FHD
HDMI2_CLK+
002:D9
+5V_ST
GND
R734
22
FHD
HDMI2_SDA
HDMI1_RX2-
002:D8
HDMI3_RX2+
002:E13
R713
2K
HDMI2_RX0+
002:D10
5V_HDMI_1
HDMI1_SCL
002:D9;007:J16
+5V_ST
5V_HDMI_2
HDMI1_RX0+
002:D7
HDMI1_RX2+
002:D8
IC702
AT24C02BN-10SU-1.8
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
EDID_WP
R735
0
FHD
CEC_REMOTE
R715
0
JP705
D705
ENKMC2838-T112
A
1
C
A
2
HDMI1_CLK-
002:D7
5V_HDMI_3
HDMI3_RX2-
002:E13
HPD1
HDMI1_SDA
HDMI2_RX0-
002:D10
HDMI3_RX1-
002:E13
R706
0
R721
22
HDMI2_RX1-
002:D10
C702
0.1uF
HDMI1_RX1-
002:D8
HDMI3_CLK-
002:E12
EDID_WP
IC704
CAT24WC08W-T
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
EEPROM_SDA
EEPROM_SCL
R716
22
R718
22
R712
4.7K
+3.3V
R709
1K
OPT
D703
MMBD301LT1G
30V
R740
0
R726
68K
+3.3V_ST
GND
R727
9.1K
C708
0.1uF
16V
Q701
SSM6N15FU
3
DRAIN2
2
GATE1
1
SOURCE1
4
SOURCE2
5
GATE2
6
DRAIN1
R739
0
OPT
CEC_REMOTE
007:J6;007:X6;007:AL6
HDMI_CEC
002:E14
JP709
R747
4.7K
C704
0.1uF
Q702
2SC3052
E
B
C
R741
1K
R703
10K
+5V_ST
R742
47K
OPT
HPD2
+5V_ST
Q703
E
B
C
R719
10K
C703
0.1uF
16V
R723
1K
OPT
R743
1K
R744
47K
OPT
HPD3
+5V_ST
Q704
FHD
E
B
C
R732
10K
C706
0.1uF
16V
FHD
R736
1K
OPT
R745
1K
FHD
R746
47K
OPT
R710
4.7K
R711
4.7K
R724
4.7K
R725
4.7K
R737
4.7K
FHD
R738
4.7K
FHD
JK701
EAG39789401
1
D2+
2
D2_GND
3
D2-
4
D1+
5
D1_GND
6
D1-
7
D0+
8
D0_GND
9
D0-
10
CK+
11
12
13
14
15
16
17
18
19
20
21
22
JK702
EAG39789401
1
D2+
2
D2_GND
3
D2-
4
D1+
5
D1_GND
6
D1-
7
D0+
8
D0_GND
9
D0-
10
CK+
11
12
13
14
15
16
17
18
19
20
21
22
EAX59793902(0)
7    11
HDMI
   2009.01.31
UI_HW_PORT2
UI_HW_PORT1
UI_HW_PORT3/SIDE
LH35 SIDE HDMI
HDCP EEPROM
Addr:10101--
Place this near by S6
AUS_LH20/LH35
Only LH35_FHD
FHD Option has been applied to this block
For LH20_35 MP
EAX59793902(0)_AUS_MERCURY
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.
AMP
0.1uF
C836
50V
0.1uF
C828
50V
SPK_R+ 008:AH20
C830
1000pF
50V
R824
3.3
C825
22000pF
50V
C835
0.47uF
50V
SPK_R- 008:AH20
MS_LRCK
002:X20
AMP_VCC
0.01uF
C843
50V
R826
3.3
0.1uF
C820
50V
0.01uF
C841
50V
R820
4.7K
SB_MUTE
001:AO10
0.01uF
C842
50V
L804
DA-8580
EAP38319001
2S
1S
1F
2F
SUB/AMP_SDA
001:I25;001:AJ12;010:W23
SPK_L- 008:AH19
0.1uF
C837
50V
R827
3.3
R822
4.7K
MS_LRCH
002:X20
SPK_L+
008:AH19
C831
1000pF
50V
MS_SCK
002:X20
AUDIO_MASTER_CLK
002:X20
C832
1000pF
50V
0.1uF
C827
50V
C824
22000pF
50V
+1.8V_AMP
C818
22000pF
50V
+1.8V_AMP
C834
0.47uF
50V
0.1uF
C839
50V
C833
1000pF
50V
0.1uF
C838
50V
AMP_RST
001:AA21
L805
DA-8580
EAP38319001
2S
1S
1F
2F
0.01uF
C840
50V
C817
1uF
10V
R825
3.3
SUB/AMP_SCL
001:I25;001:AJ12;010:W23
R823
4.7K
C814
22000pF
50V
R821
4.7K
+1.8V_AMP
SPK_R-
008:AJ14
SPK_L-
008:AJ10
SPK_L+
008:AJ8
SPK_R+
008:AJ12
C804
100pF
50V
R809
100
R808
100
R803
3.3K
R802
100
P801
WAFER-ANGLE
1
2
3
4
R801
0
+3.3V
Q801
2SC3052
E
B
C
+3.3V_ST
R810
33K
OPT
AMP_VCC
R813
10K
C812
33pF
50V
C809
33pF
50V
0.1uF
C808
0.1uF
C805
50V
C802
0.1uF
50V
0.1uF
C813
50V
C807
1000pF
50V
C806
1000pF
50V
R804
0
R805
100
R806
100
R807
100
D802
100V
1N4148W
OPT
D803
100V
1N4148W
OPT
D804
100V
1N4148W
OPT
D805
100V
1N4148W
OPT
L801
BLM18PG121SN1D
L802
BLM18PG121SN1D
AMP_VCC
L803
CB3216PA501E
Big_+24V/Small_+15V
L807
120-ohm
L809
120-ohm
L808
120-ohm
IC801
NTP-3100L
EAN60664001
1
BST1A
2
VDR1A
3
RESET
4
AD
5
DVSS_1
6
VSS_IO
7
CLK_I
8
VDD_IO
9
DGND_PLL
10
AGND_PLL
11
LFM
12
AVDD_PLL
13
DVDD_PLL
14
TEST0
15
DVSS_2
16
DVDD
17
SDATA
18
WCK
19
BCK
20
SDA
21
SCL
22
MONITOR_0
23
MONITOR_1
24
MONITOR_2
25
FAULT
26
VDR2B
27
BST2B
28
PGND2B_1
29
PGND2B_2
30
OUT2B_1
31
OUT2B_2
32
PVDD2B_1
33
PVDD2B_2
34
PVDD2A_1
35
PVDD2A_2
36
OUT2A_1
37
OUT2A_2
38
PGND2A_1
39
PGND2A_2
40
BST2A
41
VDR2A
42
NC
43
VDR1B
44
BST1B
45
PGND1B_1
46
PGND1B_2
47
OUT1B_1
48
OUT1B_2
49
PVDD1B_1
50
PVDD1B_2
51
PVDD1A_1
52
PVDD1A_2
53
OUT1A_1
54
OUT1A_2
55
PGND1A_1
56
PGND1A_2
R815
10K
D801
ENKMC2838-T112
A1
C
A2
NTP_MUTE
001:AO10
TP801
TP802
TP803
R816
12
R817
12
R828
12
R829
12
L806
120-ohm
10uF
C822
35V
C811
1uF
25V
C819
1uF
25V
C823
1uF
25V
C829
68uF
35V
C816
0.1uF
50V
R811 100
0.1uF
C815
50V
10uF
C800
35V
C821
68uF
35V
R800
12
R812
12
R818
12
R819
12
C801
1uF
10V
C803
1uF
10V
C810
1uF
10V
SPEAKER_L
SPEAKER_R
EAX59793902(0)
8    11
AMP
   2009.01.31
AUS_LH20/LH35
For LH20_LH35 MP PCB _090131
EAX59793902(0)_AUS_MERCURY
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.
POWER
C901
0.1uF
16V
C947
0.1uF
50V
R949
22K
1%
OPC_OUT
L913
2.2uH
R909
0
OPT
C955
0.1uF
50V
ERROR_OUT
R946
1.8K
C940
0.1uF
16V
OPT
L910
BLM18PG121SN1D
Big_+24V/Small_+15V
L909
CB3216UA121
26"UP
GND
C918
100uF
16V
26"UP
C950
100uF
25V
PWM_DIM
C942
0.1uF
50V
C914
0.1uF
50V
26"UP
L918
22"UNDER
Big_+12V/Small_+15V
009:P1;009:AC2
IC906
MP2305DS
3
SW
2
IN
4
GND
1
BS
5
FB
6
COMP
7
EN
8
SS
C905
100uF
16V
C945
22uF
16V
R933
10.5K
1%
R943
10K
R936
10K
OPT
+3.3V_ST
+5V_ST
Q904
2SC3052
E
B
C
C956
5.6nF
50V
R913
0
22"UNDER
R926
10K
R951
56000
5%
C908
0.1uF
16V
C917
0.1uF
50V
IC901
AP1117E33G-13 
2
OUT
3
IN
1
ADJ/GND
Big_+24V/Small_+15V
C932
4.7uF
16V
Q903
2SC3052
26"UP
E
B
C
+3.3V
R957
56K
1%
C931
10uF
16V
C944
330pF
C904
0.1uF
50V
R937
75K
1/8W
1%
+1.8V_DDR
C916
0.1uF
50V
POWER_ON/RL_ON
R939
22K
1%
R938
10K
C925
22uF
C937
0.1uF
50V
+5V_ST
Big_+12V/Small_+15V
C948
0.1uF
50V
+5V_ST
IC902
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
+3.3V_AVDD_MPLL
C928
10uF
R945
10K
0.1uF
C949
4.7K
R901
22
R922
OPT
GND
PWM_DIM_LARGE
R934
8.2K
1%
R944
10K
1/10W
OPT
+3.3V_AVDD
+3.3V
+3.3V
C902
0.1uF
OPT
+3.3V_ST
R925
22
OPC
C939
0.1uF
50V
C910
220uF
16V
R931
10K
26"UP
L915
3.6uH
NR8040T3R6N
R950
10K
1/10W
SMALL_PANEL_POWER_SRC
R948
10K
C912
0.1uF
50V
C946
22uF
16V
OPT
R911
0
OPT
L905
BLM18PG121SN1D
22"UNDER
R958
9.1K
R908
0
L914
2.2uH
+3.3V_ST
R935
10K
C951
0.47uF
25V
R953
100K
POWER_ON/RL_ON
001:AO11;009:M10;009:AE12;010:W17
A_DIM
C930
0.1uF
50V
+5V_USB
L911
BLM18PG121SN1D
+3.3V_ST
R940
22K
L902
BLM18PG121SN1D
22"UNDER
L916
BLM18PG121SN1D
+12V
R952
75K
5%
+5V_ST
R942
10
1/10W
1%
R959
12.4K
1%
C959
0.1uF
50V
C922
22uF
OPT
Q906
RSR025P03
S
D
G
C906
0.1uF
50V
C938
330pF
+1.8V_AMP
L908
BLM18PG121SN1D
C926
22uF
+5V_ST
L912
BLM18PG121SN1D
26"UP
+1.26V_VDDC
C953
22uF
16V
3216
PANEL_POWER
R941
22K
C966
0.1uF
50V
C929
0.01uF
50V
C927
10uF
Q905
2SC3052
E
B
C
L903
CB3216UA121
L906
CB3216UA121
PANEL_CTL
001:AK10
+1.8V_DDR
L921
Big_+12V/Small_+15V
L917
22UH
C919
22uF
L920
BLM18PG121SN1D
C967
0.1uF
50V
+5V_TUNER
GND
+5V_ST
C960
0.1uF
C965
0.1uF
+5V_GENERAL
001:G23;005:Y4;005:Z4;009:AK3
Q908
RSR025P03
S
D
G
R956
10K
C961
10uF
16V
C963
10uF
Q907
2SC3052
E
B
C
+5V_ST
L922
CIC21J501NE
POWER_ON/RL_ON
R961
560
C958
10uF
OPT
C962
22uF
16V
C964
22uF
16V
L919
BLM18PG121SN1D
26"UP
+5V_GENERAL
L901
BLM18PG121SN1D
26"UP
+12V
R962
0
22"
R960
10K
R929
10K
26"UP
Q902
26"UP
1
2
3
L907
BLM15BD121SN1 
26"UP
R930
33K
OPT
R918
0
26"UP
POWER_ON/OFF_RESETIC
POWER_ON/RL_ON
R964
0
R965
0
R963
0
POWER_ON/OFF_GPIO
+3.3V_ST
R916
10K
+5V_GENERAL
R912
100
R928
10K
OPT
Q901
2SC3052
E
B
C
R927
10K
INV_CTL
R914
6.8K
OPT
R919
10K
A_DIM_SMALL
A_DIM_SMALL
L904
BG2012B080TF
22"UNDER
C907
1uF
25V
OPT
PWM_DIM_LARGE
P902
FM20020-24
26"UP
EAG60670701
19
NC
14
12V
9
5.2V
4
GND
18
24V
13
12V
8
5.2V
3
GND
17
24V
12
GND
7
5.2V
2
PWR_ON
16
GND
11
GND
6
GND
1
NC
20
INV ON
15
GND
10
5.2V
5
GND
21
A_DIM
22
Err OUT
23
NC
24
P_DIM
25
.
P901
WAFER-ANGLE
22"UNDER
6602T20009K
1
15V(18v)
2
15V(18v)
3
GND
4
GND
5
5V
6
5V
7
ACD
8
PWR-ON
9
INV_CTL
10
DIM
11
INV_BR
C968
0.1uF
50V
L923
BLM18PG121SN1D
L924
BLM18PG121SN1D
22"UNDER
SMALL_PANEL_POWER_SRC
IC903
BD9150MUV
1
PGND2_1
3
PVCC_2
7
SW1_1
9
EN1
10
FB1
11
ITH1
12
AGND
13
NC
14
AVCC
15
ITH2
16
FB2
17
EN2
18
SW2_1
19
SW2_2
20
PGND2_2
5
PGND1_1
8
SW1_2
6
PGND1_2
4
PVCC_3
2
PVCC_1
C915
68uF
C913
68uF
C933
1uF
25V
C943
1uF
25V
OPT
1uF
C903
25V
OPT
C954
4.7uF
10V
OPT
C957
4.7uF
10V
OPT
C970
100pF
50V
OPT
C971
100pF
50V
OPT
C984
0.022uF
16V
C969
0.022uF
16V
OPT
C952
0.1uF
50V
R947
0
C936
0.1uF
50V
EAX59793902(0)
9   11
POWER
   2009.01.31
Stand-by +3.3V
C1130
C IN
$0.24
450 mA
Placed on SMD-TOP
Vout=0.923*(1+R1/R2)
MAX 3A
Vout=0.8*(1+R1/R2)
Close to IC
$0.07
465 mA @85% efficiency
Placed on SMD-TOP
4.9A 0.0150OHM 34MHZ
R2
Close to IC
Vout=0.8*(1+R1/R2)
R1
 Panel Power
$0.048
C OUT
$0.28
Replaced Part
+5V
S6 core 1.26 volt
R1
DEVELOPE
R2
1600 mA
R2
FROM LIPS & POWER B/D
R1
For Power Sequence about PSU
+5V_GENERAL(Src is +5V_ST)
AUS_LH20/LH35 MP
Direction
Direction
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