LG 19LV2500-UG (CHASSIS:LA01R) 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.
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.
SMALL_TN_LVDS
RXACK-
L3001
120-ohm
HD_18.5
RXA1-
P3001
FF10001-30
HD_18.5
1
[30]
2
[29]
3
[28]
4
[27]
5
[26]
6
[25]
7
[24]
8
[23]
9
[22]
10
[21]
11
[20]
12
[19]
13
[18]
14
[17]
15
[16]
16
[15]
17
[14]
18
[13]
19
[12]
20
[11]
21
[10]
22
[9]
23
[8]
24
[7]
25
[6]
26
[5]
27
[4]
28
[3]
29
[2]
30
[1]
31
.
RXA3+
C3002
0.1uF
16V
0.1uF
16V
FHD_21.5
C3003
10uF
16V
10uF
16V
OPT
RXA3+
RXB2+
RXB1+
RXA0-
C3005
0.1uF
16V
0.1uF
16V
HD_18.5
RXB3+
RXB0-
RXA2+
RXBCK+
RXA3-
RXACK-
RXB2-
L3000
120-ohm
FHD_21.5
RXA2+
RXA0+
RXA3-
C3004
1000pF
50V
1000pF
50V
OPT
P3000
FF10001-30
FHD_21.5
1
[30]
2
[29]
3
[28]
4
[27]
5
[26]
6
[25]
7
[24]
8
[23]
9
[22]
10
[21]
11
[20]
12
[19]
13
[18]
14
[17]
15
[16]
16
[15]
17
[14]
18
[13]
19
[12]
20
[11]
21
[10]
22
[9]
23
[8]
24
[7]
25
[6]
26
[5]
27
[4]
28
[3]
29
[2]
30
[1]
31
.
RXA2-
RXA4-
RXB0+
RXACK+
RXB3-
C3000
10uF
16V
10uF
16V
OPT
RXB1-
PANEL_VCC
RXACK+
RXA1+
RXA0+
C3001
1000pF
50V
1000pF
50V
OPT
PANEL_VCC
RXA0-
RXA2-
RXB4-
RXA1-
A_DIM
RXA1+
RXBCK-
RXB4+
D9904
5.6V
SIDE_CVBS
ADMC5M03200L_AMODIODE
JK9901
KJA-PH-1-0177
SIDE_CVBS
3
M3_DETECT
4
M4
5
M5_GND
1
M1
6
M6
D9901
30V
SIDE_CVBS
ADUC30S03010L_AMODIODE
C9906
100pF
50V
SIDE_CVBS
SIDEAV_R_IN
R9906
470K
SIDE_CVBS
R9914
10K
SIDE_CVBS
R9911
10K
SIDE_CVBS
R9913
10K
SIDE_CVBS
C9901
100pF
SIDE_CVBS
L9903
BLM18PG121SN1D
SIDE_CVBS
SIDEAV_CVBS_IN
C9905
100pF
50V
SIDE_CVBS
L9901
BLM18PG121SN1D
SIDE_CVBS
+3.3V_Normal
R9916
12K
SIDE_CVBS
SIDEAV_DET
R9905
470K
470K
SIDE_CVBS
D9903
5.6V
SIDE_CVBS
ADMC5M03200L_AMODIODE
R9917
12K
12K
SIDE_CVBS
D9902
5.6V
OPT
ADMC5M03200L_AMODIODE
R9915
1K
1K
SIDE_CVBS
SIDEAV_L_IN
R9907
75
SIDE_CVBS
L9902
BLM18PG121SN1D
SIDE_CVBS
C9907
100pF
OPT
RXA4+
LVDS_SMALL_TN
[30Pin HD LVDS Connector]
(For HD 60Hz_Small)
(For HD 60Hz_Small)
[30Pin FHD LVDS Connector]
(For FHD 60Hz_Small)
(For FHD 60Hz_Small)
LVDS&SIDE AV
2011.05.10
30
S7LR SMALL TN
SIDE CVBS PHONE JACK
(New Item Development)
THERMAL
THERMAL
THERMAL
THERMAL
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.
R7511
6.8K
OPT
C7864
100pF
50V
OPT
C7547
0.1uF
16V
0.1uF
16V
C7542
3.3uF
50V
3.3uF
50V
C7959
0.1uF
16V
0.1uF
16V
OPT
C7550
10uF
25V
10uF
25V
L7505
R7540
120K
120K
1%
L7514
3.6uH
3.6uH
NR8040T3R6N
+3.5V_ST
+2.5V_Normal
C7527
0.1uF
50V
R7515
10K
IC7861
AOZ1072AI-3
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
R7548
2.7K
1%
R7542
22K
OPT
C7867
0.1uF
16V
0.1uF
16V
R7567
10K
1%
C7862
10uF
25V
10uF
25V
R7864
2.2K
PANEL_DISCHARGE_RES
C7958
0.1uF
16V
0.1uF
16V
+3.5V_ST
R7522
10K
10K
R7581
1.6K
1/8W
1%
+12V/+15V
C7922
0.1uF
50V
0.1uF
50V
C7865
22uF
16V
22uF
16V
Q7521
AO3407A
G
D
S
C7529
10uF
16V
16V
OPT
Q7505
2SC3052
2SC3052
E
B
C
+5V_Normal
C7933
0.01uF
50V
0.01uF
50V
C7578
0.1uF
16V
0.1uF
16V
IC7509
NCP803SN293
1
GND
3
VCC
2
RESET
R7559
12K
C7525
0.01uF
25V
PANEL_VCC_0.01uF
R7538
6.8K
1%
R7862
22K
22K
C7519
1uF
25V
1uF
25V
L7508
4.7uH
4.7uH
SP-7850_4.7
R7525
68K
1/16W
5%
C7861
10uF
25V
10uF
25V
C7502
0.1uF
50V
50V
R7586
100
100
1%
OPT
+12V/+15V
Q7503
2SC3052
2SC3052
OPT
E
B
C
C7552
10uF
25V
10uF
25V
R7565
51K
1%
+3.5V_ST
+24V/+15V
R473
1
+3.3V_Normal
L7504
MLB-201209-0120P-N2
R7583
0
1/16W
5%
OPT
INV_CTL
RL_ON_BUFFER
R7529
100K
100K
C7526
0.1uF
16V
0.1uF
16V
WLED_ENABLE
R7866
12K
L7509
3.6uH
3.6uH
NR8040T3R6N
C7570
0.1uF
16V
0.1uF
16V
C7533
0.1uF
50V
0.1uF
50V
C7532
10uF
25V
C7863
2200pF
PANEL_VCC
R7570
18K
R7585
100K
100K
OPT
POWER_DET
C7538
10uF
10V
10uF
10V
R7860
10K
D7500
MBRA340T3G
L7912
MLB-201209-0120P-N2
R7543
30K
1/10W
1%
+5V
+3.3V_Normal
R7870
10K
1%
R7867
10K
IC7507
AOZ1072AI-3
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
C7537
10uF
25V
R7582
100
100
1%
+24V/+15V
C440
0.1uF
16V
0.1uF
16V
L7862
3.6uH
3.6uH
NR8040T3R6N
RL_ON_BUFFER
+24V/+15V
R7521
10K
10K
OPT
C7524
220pF
220pF
50V
C7545
0.1uF
50V
C7514
0.1uF
0.1uF
50V
+3.5V_ST
C7924
0.1uF
50V
0.1uF
50V
R7523
22K
OPT
PANEL_CTL
R7516
10K
+24V_LED_driver
Q7502
2SC3052
E
B
C
R7519
22
1/16W
5%
+24V/+15V
C7932
3.3uF
50V
3.3uF
50V
IC7512
NCP803SN293
OPT
1
GND
3
VCC
2
RESET
C7540
3.3uF
50V
3.3uF
50V
R7527
22K
OPT
C7560
2200pF
R7861
27K
27K
C7517
68uF
35V
35V
Q7506
AO3407A
G
D
S
C7522
1uF
50V
1uF
50V
R7561
100K
100K
+12V/+15V
R7571
22
R7500
10K
10K
R7569
10K
OPT
R7503
22K
22K
R7566
1.5K
1%
+5V_Normal
C403
10uF
10V
10uF
10V
C7536
3.3uF
50V
3.3uF
50V
POWER_ON/OFF_1
Q7504
SI4124DY-T1-GE3(VISHAY)
3
S_3
2
S_2
4
G
1
S_1
5
D_1
6
D_2
7
D_3
8
D_4
+24V/+15V
IC7502
MP8670DN-LF-Z
3
VCC
2
BST
4
BG
1
SW
5
GND
6
FB
7
EN/SYNC
8
IN
R7531
2.7K
C7926
0.01uF
50V
C7544
0.1uF
50V
0.1uF
50V
R7501
27K
27K
R7547
15K
1%
R7560
10K
R7865
0
0
IC7503
MP4460DQ-LF-Z
3
EN
2
SW_2
4
COMP
1
SW_1
5
FB
6
GND
7
FREQ
8
VIN_1
9
VIN_2
10
BST
11
EP_GND
C7571
10uF
10V
10uF
10V
C7503
2.2uF
2.2uF
50V
C7925
2.2uF
2.2uF
50V
JK7500
JPD003N-M432-4F
GND
SW
24V
C7866
0.1uF
16V
0.1uF
16V
R7530
22K
R7584
27K
1/16W
1%
OPT
C7505
0.01uF
50V
C7565
100pF
100pF
50V
R7517
10K
OPT
L7861
R7863
2.2K
PANEL_DISCHARGE_RES
+24V
R7514
1K
L7913
CPI2520NHL3R3ME
2520
3.3uH
+24V_LED
C7543
0.1uF
50V
0.1uF
50V
C7501
0.1uF
50V
0.1uF
50V
+24V_LED
C432
0.1uF
16V
0.1uF
16V
Q7501
AO3407A
G
D
S
C7868
0.1uF
50V
C7566
22uF
16V
22uF
16V
C7961
22uF
16V
22uF
16V
C7960
0.1uF
16V
0.1uF
16V
+5V
C7962
0.1uF
16V
0.1uF
16V
IC7952
AP1117EG-13
1
ADJ/GND
2 OUT
3
IN
R7869
51K
1%
R7868
24K
1%
110
R7956
R7957
330
R7958
1
1/10W
+5V_TUNER
10uF
C461
10V
+3.5V_ST
IC407
AP7173-SPG-13 HF(DIODES)
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
560pF
C467
50V
+1.5V_DDR
C472
22uF
10V
R433
10K
10K
L420
BLM18PG121SN1D
+3.3V_Normal
C475
0.1uF
16V
C476
0.1uF
16V
L7954
BLM18PG121SN1D
R443
10K
10K
C423
4.7uF
16V
4.7uF
16V
OPT
R438
22K
22K
+3.3V_Normal
Q403
RSR025P03
S
D
G
R446
10K
OPT
L403
BLM18PG121SN1D
C445
0.1uF
16V
0.1uF
16V
OPT
Q400
2SC3052
2SC3052
E
B
C
C425
0.1uF
16V
R445
2.2K
+3.5V_ST
C437
22uF
16V
22uF
16V
C435
0.1uF
16V
R434
10K
POWER_ON/OFF_1
C7531
4.7uF
16V
C7504
0.015uF
50V
0.015uF
50V
PANEL_VCC_0.015uF
C453
22uF
22uF
10V
C444
0.1uF
16V
0.1uF
16V
L413
R436
15K
15K
+3.3V_Normal
+1.10V_VDDC
C456
22uF
22uF
10V
+3.5V_ST
C447
0.1uF
16V
R
4
4
1
5
6
K
1
/
1
6
W
1
%
L415
3.6uH
NR8040T3R6N
C431
0.1uF
16V
0.1uF
16V
FB_CORE
C448
3300pF
50V
C441
0.1uF
16V
C439
100pF
50V
R428
10K
IC403
TPS54319TRE
1
VIN_1
3
GND_1
7
COMP
9
SS/TR
10
PH_1
11
PH_2
12
PH_3
13
BOOT
14
PWRGD
15
EN
16
VIN_3
5
AGND
8
RT/CLK
6
VSENSE
4
GND_2
2
VIN_2
17
EP[GND]
R400
0
OPT
C430
10uF
10V
10uF
10V
R432
330K
1/16W
5%
R
4
4
2
2
7
K
1
/
1
6
W
1
%
R416
56K
56K
1%
C493
3300pF
50V
3300pF
50V
C405
10uF
25V
10uF
25V
C494
1uF
10V
1uF
10V
R607
11K
11K
1%
C489 100pF
L401
L406
3.6uH
NR8040T3R6N
R410
10K
+12V/+15V
R423
12K
1%
C492
22uF
16V
22uF
16V
OPT
C420
22uF
16V
22uF
16V
+5V_USB
OLP
R456
4.7K
1%
4.7K
1%
R457
4.3K
1%
1%
R7537
100K
100K
1/8W
5%
5%
C488
3300pF
50V
R7544
100K
100K
1/10W
1%
1%
C413
0.1uF
50V
R499
0
1/16W
5%
IC402
TJ3940S-2.5V-3L
1
GND
2
VOUT
3
VIN
C7541
0.1uF
50V
50V
OPT
R7524
10K
+3.5V_ST
R7505
10K
RL_ON
R7507
4.7K
4.7K
OPT
Q7507
2SC3052
2SC3052
OPT
E
B
C
Q7508
RT1P141C-T112
OPT
1
2
3
R7504
10K
10K
OPT
R7506
10K
OPT
+3.5V_ST
RL_ON_BUFFER
R7508
0
0
R7502
10K
OPT
IC401
TPS54327DDAR
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
C7957
0.1uF
16V
0.1uF
16V
OPT
R180
10K
OPT
+3.3V_Normal
R181
1K
1K
OPT
Q7500
MMBT3904(NXP)
E
B
C
Q7520
MMBT3904(NXP)
E
B
C
Vout=(1+R1/R2)*0.8
2A
24V-->3.48V
+2.5V
Switching noise reducing [MPS recommend]
R1
Vd=550mV
4A -> 3A modify 090916
close to pin
New item
AO3407A Vgs : 10.8V(24V input)
24V->15V
Power for LED driver
300 mA
AMP_VCC Control
2A
close to IC7502
R2
MAX 1A
R2
+5V to LDO(IC7952)
R2
+5V_Normal
Max 1A
R1
AMP_VCC
real output : 12.3V
UNDER CHECKING
R1
Vout=0.8*(1+R1/R2)
AO3407A Vgs : 8.3V(15V input)
ST_3.5V-->3.5V --> 3.375V
PANEL_POWER
24V->3.5V
Placed on SMD-TOP
Power_DET
AO3407A Vgs : 10.8V
3.3K -> 1K (threshold voltage up)
POWER
2011.06.17
32
S7LR SMALL TN
LDO for Tuner, Hongsu, 1115
6.8V
Max 1000mA
Vout=0.8*(1+R1/R2) = 1.5319
R2
R1
1.5A
+1.5V_DDR
S7LR core 1.2V volt
780 mA
+3.3V_Normal
Vout=0.827*(1+R1/R2)=1.225V
3A
R1
R2
(LIPS : 3.9K)
(LIPS : 1.2K)
(LIPS)
(LIPS)
(LIPS)
(LIPS_PWR_DET_ONSEMI)
(PWR_DET_ONSEMI)
2000 mA
R1
R2
Vout=(1+R1/R2)*0.765=5.03V
+5V_USB
3A
* option : +5V_TUNER
2.5A
1A
1A
(LIPS)
Not used :
only for small(ready)
only for small(ready)
Trouble shooting guide
1. Power-up boot check
Check X201 clock
24 MHz
Replace X201
Replace Q7506
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
ok
ok
ok
ok
ok
ok
No
No
No
No
ok
Check Adater power.
JK7500 : 24V
Replace Adapter
No
Check Standby Voltage
C7538 : +3.5V_ST
Replace IC7503
Check R7505(RL_ON).
RL_ON : 3.3V
Replace Mstar(IC101) or Main Board
Re-download software.
No
No
Check IC7502/7, IC403/7 Output Voltage
IC7502 : 12V
IC7507 : 5.0V
IC403 : 1.1V
IC407 : 1.5V
IC407 : 1.5V
Q403 : 3.3V
No
Replace IC7502/7, IC403/7, Q403
Check LVDS Power Voltage
Q7506 : 5V(22”/19”)
Check Inverter Control
P10001
Change LED driver IC(IC10000)
Change Module
ok
No
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