LG 42LT770H (CHASSIS:LA2FF) Service Manual ▷ View online
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.
C2432
0.01uF
50V
L2407
BLM18PG121SN1D
+1.5V_DDR
+5V_NORMAL
C2415
10uF
16V
10uF
16V
R2432
330K
1/16W
5%
Q2406
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
+3.5V_ST
L2412
BLM18PG121SN1D
C2401
0.1uF
0.1uF
50V
L2405
BLM18PG121SN1D
C2422
0.01uF
50V
C2416
100pF
50V
C2406
0.1uF
16V
0.1uF
16V
C2418
10uF
10V
10uF
10V
R2433
56K
56K
1/16W
1%
L2408
BLM18SG121TN1D
+24V
C2417
1uF
10V
1uF
10V
R2431
15K
15K
1/16W
5%
R2425
100
100
Q2407
AO3407A
G
D
S
C2412
0.1uF
16V
0.1uF
16V
P2401
SMAW200-H24S2
SLIM_32~55
19
12V
14
GND
9
3.5V
4
24V
18
INV ON
13
GND
8
GND
3
24V
17
12V
12
3.5V
7
GND
2
24V
16
GND/V-sync
11
3.5V
6
GND
1
PWR ON
20
A.DIM
15
GND
10
3.5V
5
GND
21
12V
22
P.DIM1
23
GND/P.DIM2
24
Err OUT
25
R2419
100
100
L2403
CIS21J121
IC2401
NCP803SN293
1
GND
3
VCC
2
RESET
R2435
10K
+12V
C2440
1uF
25V
OPT
25V
OPT
C2423
0.1uF
16V
+3.3V_TU_IN
L2401
CIS21J121
R2418
100
100
OPT
R2416
100K
100K
L2409
3.6uH
3.6uH
NR8040T3R6N
INV_CTL
C2429
0.1uF
16V
16V
ERROR_OUT
R2420
0
POWER_16_GND
+3.5V_ST
L2406
3.6uH
3.6uH
NR8040T3R6N
R2421
10K
10K
OPT
PWM_DIM2
R2424
4.7K
OPT
4.7K
OPT
IC2403
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]
R2413
0
5%
0
5%
OPT
+12V
L2402
CIS21J121
R2417
100K
100K
L/DIM0_VS
C2433
0.1uF
50V
0.1uF
50V
C2419
0.1uF
16V
0.1uF
16V
+3.5V_ST
R2423
0
POWER_16_VSYNC
C2430
22uF
10V
22uF
10V
PANEL_CTL
C2410
0.1uF
16V
0.1uF
16V
C2420
0.1uF
16V
POWER_DET
IC2404
TPS54327DDAR
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
C2428
3300pF
50V
3300pF
50V
+12V
+3.5V_ST
C2411
0.1uF
16V
0.1uF
16V
PWM_DIM1
+3.3V_NORMAL
IC2402
NCP803SN293
1
GND
3
VCC
2
RESET
C2427
0.1uF
16V
0.1uF
16V
R2439
10K
1%
R2434
47K
1%
+24V
P2400
FW20020-24S
NORMAL_EXCEPT_32
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
C2426
100pF
50V
100pF
50V
PANEL_VCC
+3.5V_ST
C2443
0.1uF
50V
0.1uF
50V
R2437
10K
10K
A_DIM
R2422
0
POWER_24_GND
R2415
56K
1%
C2421
4700pF
50V
R2442
10K
MTK_EPI
R2441 1.8K
MTK_EPI
+12V
R2430
10K
RL_ON
+3.5V_ST
C2413
0.1uF
0.1uF
50V
R2401
10K
C2402
10uF
16V
C2441
3300pF
50V
OPT
R2403
10K
R24000
OPT
L2404
2uH
C2400
10uF
16V
POWER_ON/OFF1
R2406
10K
1%
C2403
0.1uF
16V
OPT
C2404
0.1uF
16V
IC2400
AOZ1038PI
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
NC_1
8
NC_2
9
[EP]LX
+12V
C2414
10uF
10V
C2409
10uF
10V
C2408
10uF
10V
C2407
10uF
10V
+1.2V_MTK_CORE
L2400
BLM18PG121SN1D
C2445
22pF
50V
22pF
50V
C2434
0.1uF
50V
0.1uF
50V
+12V
+3.3V_NORMAL
C2431
10uF
16V
16V
R2428
10K
10K
1%
C2438
1uF
10V
10V
C2437
0.1uF
0.1uF
C2442
22uF
10V
22uF
10V
C2439
3300pF
50V
R2414
10K
C2444
22uF
10V
10V
R2407
100K
L2411
2uH
+3.3V_NORMAL
R2427
33K
1%
L2410
BLM18PG121SN1D
IC2405
TPS54425PWPR
3
VREG5
2
VFB
4
SS
1
VO
6
PG
5
GND
7
EN
8
PGND1
9
PGND2
10
SW1
11
SW2
12
VBST
13
VIN1
14
VIN2
15
[EP]PGND
C2436
0.1uF
16V
0.1uF
16V
POWER_ON/OFF2_1
POWER_ON/OFF1
POWER_ON/OFF2_2
POWER_ON/OFF2_3
POWER_ON/OFF2_4
POWER_ON/OFF2_1
POWER_ON/OFF2_3
POWER_ON/OFF2_2
R2402
3.3K
C2405
4700pF
50V
R2404
5.6K
1%
C24001
0.1uF
16V
0.1uF
16V
R2410
2.7K
1%
2.7K
1%
PD_12V
R2411
1.5K
1%
1.5K
1%
PD_24V
R2409
1.2K
1%
1%
PD_12V
R2412
8.2K
1%
8.2K
1%
PD_24V
C2446
10uF
10uF
10V
C2447
10uF
10uF
10V
C2424
10uF
10uF
10V
C2425
10uF
10uF
10V
C2435
4.7uF
4.7uF
50V
R2429
0
5%
0
5%
PD_3.5V
+3.5V_ST
C2448
10uF
10V
10uF
10V
R2441-*1
5.6K
MTK_NON_EPI
R2442-*1
33K
MTK_NON_EPI
R2453
10K
OPT
OPT
+3.5V_ST
R2454
10K
+3.5V_ST
R2455
10K
R2456
10K
+3.5V_ST
R2457
10K
+3.5V_ST
R2426
10K
R2458
33
FOR LPB MODEL
R2459
33
FOR LPB MODEL
I2C_SCL5
I2C_SDA5
P2403
12507WR-08L
FOR LPB MODEL
1
2
3
4
5
6
7
8
9
P2402
FM20020-24
NORMAL_32
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
25
R2460
10K
Q2402
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
R2461
10K
+3.5V_ST
R2408
4.7K
Q2401
RT1P141C-T112
E
B
C
R2462
0
NON_37_LGD
R2463
0
OPT
R2451
2K
1/8W
PANEL_DISCHARGE_REG
R2452
2K
1/8W
PANEL_DISCHARGE_REG
JP2411
24
MID_POWER
2011.09.29
Vout=0.827*(1+R1/R2)=1.521V
3A
On-semi
24V-->3.48V
TYP 1450mA
#16/#20/#23
LD - GND OR USE
LE(N.L.D.) - OPEN
LE(L.D.) - USE
LD - GND OR USE
LE(N.L.D.) - OPEN
LE(L.D.) - USE
R2
FROM LIPS & POWER B/D
R2
DDR MAIN 1.5V
PANEL_POWER
R1
R1
12V-->3.58V
Power_DET
not to RESET at 8kV ESD
ST_3.5V-->3.5V
$ 0.145
3A
3A
+5V_Normal
Placed on SMD-TOP
*NOTE 17
R1
R2
Vout=0.8*(1+R1/R2)
4A
Vout=(0.763+0.0017*Vout.set)*(1+R1/R2)
+3.3V_NORMAL
MAX 3.4 A
R2
R1
xxLT760H-UA
[To LED DRIVER]
FOR LPB Download
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.
DDC_SDA_2_JACK
R3314
100
5V_HDMI_3_JACK
5V_HDMI_2_JACK
R3324
47K
R3316
1K
R3317
1K
HDMI_HPD_4_JACK
C3303
0.1uF
16V
R3326
47K
R3313
100K
C3301
0.1uF
16V
R3339
47K
R3337
47K
DDC_SCL_2_JACK
R3307
100K
5V_HDMI_2_JACK
HDMI_HPD_2_JACK
5V_HDMI_4_JACK
R3311
1K
+5V_NORMAL
C3302
0.1uF
16V
R3338
47K
DDC_SCL_4_JACK
5V_HDMI_4_JACK
DDC_SDA_2_JACK
R3318
4.7K
HPD_PULL_UP
R3308
100
R3309
100
R3340
47K
DDC_SDA_3_JACK
DDC_SCL_2_JACK
R3310
1K
DDC_SCL_4_JACK
DDC_SCL_3_JACK
R3315
100
+5V_NORMAL
DDC_SDA_4_JACK
DDC_SDA_4_JACK
+5V_NORMAL
CEC_REMOTE
R3312
4.7K
HPD_PULL_UP
Q3301
MMBT3904(NXP)
E
B
C
Q3302
MMBT3904(NXP)
E
B
C
5V_HDMI_3_JACK
D0-_HDMI3_JACK
Q3303
MMBT3904(NXP)
E
B
C
CK+_HDMI3_JACK
CEC_REMOTE
HDMI_HPD_3_JACK
D2-_HDMI3_JACK
R3329
100
DDC_SDA_3_JACK
D1+_HDMI3_JACK
R3327
100K
R3336
4.7K
HPD_PULL_UP
D1-_HDMI3_JACK
R3328
100
D2+_HDMI3_JACK
DDC_SCL_3_JACK
D0+_HDMI3_JACK
CK-_HDMI3_JACK
R3331
1K
R3330
1K
JK3301
YKF45-7058V
14
NC
13
CEC
5
DATA1_SHIELD
20
SHIELD
12
CLK-
11
CLK_SHIELD
2
DATA2_SHIELD
19
HPD
18
+5V_POWER
10
CLK+
4
DATA1+
1
DATA2+
17
DDC/CEC_GND
9
DATA0-
8
DATA0_SHIELD
3
DATA2-
16
SDA
7
DATA0+
6
DATA1-
15
SCL
JK3302
YKF45-7058V
14
NC
13
CEC
5
DATA1_SHIELD
20
SHIELD
12
CLK-
11
CLK_SHIELD
2
DATA2_SHIELD
19
HPD
18
+5V_POWER
10
CLK+
4
DATA1+
1
DATA2+
17
DDC/CEC_GND
9
DATA0-
8
DATA0_SHIELD
3
DATA2-
16
SDA
7
DATA0+
6
DATA1-
15
SCL
JK3303
RSD-105156-100
14
RESERVED
13
CEC
5
TMDS_DATA1_SHIELD
20
BODY_SHIELD
12
TMDS_CLK-
11
TMDS_CLK_SHIELD
2
TMDS_DATA2_SHIELD
19
HOT_PLUG_DETECT
18
VDD[+5V]
10
TMDS_CLK+
4
TMDS_DATA1+
1
TMDS_DATA2+
17
DDC/CEC_GND
9
TMDS_DATA0-
8
TMDS_DATA0_SHIELD
3
TMDS_DATA2-
16
SDA
7
TMDS_DATA0+
6
TMDS_DATA1-
15
SCL
D3302
MMBD6100
A
2
C
A
1
D3301
MMBD6100
A
2
C
A
1
D3303
MMBD6100
A
2
C
A
1
HDMI_ARC
R3300
0
R3341
0
D1-_HDMI4_JACK
D2+_HDMI4_JACK
CK-_HDMI4_JACK
D1+_HDMI4_JACK
D2-_HDMI4_JACK
CK+_HDMI4_JACK
D0+_HDMI4_JACK
D0-_HDMI4_JACK
R3342
0
R3343
0
R3344
0
R3345
0
R3346
0
R3347
0
R3348
0
D0-_HDMI2_JACK
D2+_HDMI2_JACK
D2-_HDMI2_JACK
D1+_HDMI2_JACK
CK+_HDMI2_JACK
D0+_HDMI2_JACK
CK-_HDMI2_JACK
D1-_HDMI2_JACK
CEC_REMOTE
R3354
0
R3355
0
R3351
0
R3350
0
R3353
0
R3349
0
R3356
0
R3352
0
R3363
10K OPT
+3.5V_ST
R3362
10K
Q3306
MMBT3904(NXP)
E
B
C
+3.5V_ST
GND
Q3305
MMBT3904(NXP)
E
B
C
C3304
0.1uF
16V
0.1uF
16V
D3304
OPT
CEC_REMOTE
GND
GND
POWER_ON/OFF1
BSS83
Q3300
S
B
D
G
C3305
0.1uF
16V
0.1uF
16V
R3364
10K
BSS83
Q3304
S
B
D
G
R3302
68K
OPT
D3306
AVRL161A1R1NT
OPT
CEC_CTL
+3.5V_ST
R3365
10K
R3366
10K
OPT
D3305
GND
D3307
AVRL161A1R1NT
OPT
GND
R3360
68K
GND
+3.5V_ST
R3303
62K
OPT
HDMI_CEC_PTC
HDMI_CEC_MTK
IC3300
74LX1G14CTR
3
GND
2
1A
4
1Y
1
NC
5
VCC
R3367
10K
GND
R3369
10K
CEC_CTL
R3368
10K OPT
POWER_ON/OFF1
R3361
62K
R3370
22
R3371
22
JP3300
R3372
10K
HPD_PULL_DOWN
R3373
10K
HPD_PULL_DOWN
R3374
10K
HPD_PULL_DOWN
PTC_HPD
+3.5V_ST
R3377
0
R3376
0
C3306
0.1uF
0.1uF
MTK_HPD
HPD_CTL
IC3301
NLASB3157DFT2G
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
R3375
0
OPT
HDMI_HPD_2_JACK
UI : HDMI2
UI : HDMI3
UI : HDMI1
33
HDMI 4
2011.09.29
xxLT760H-UA
R3300 MTK Recommend : 0 Ohm
Close to Connector
Close to Connector
For ESD
For ESD
To PTC
To MTK
For CEC
From HDMI Connector
HPD SWITCH
B0 - A
L
MTK_HPD
H
B1 - A
PTC_HPD
HPD_CTL
CONNECTION
Fiber Optic
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.
+3.3V_NORMAL
R3641
2.7K
D3615
30V
OPT
C3633
18pF
50V
R3644
22
DSUB_B+
R3620
2.7K
OPT
+3.3V_NORMAL
DSUB_G+
RGB_DDC_SCL
DSUB_DET
DSUB_R+
R3643
22
R3646
10K
10K
C3615
0.1uF
0.1uF
16V
RGB_DDC_SDA
SPDIF_OUT
R3615
33
33
C3634
18pF
18pF
50V
+5V_NORMAL
DSUB_HSYNC
DSUB_VSYNC
D3616
30V
OPT
R3642
2.7K
2.7K
RGB_5V
RGB_5V
IC3600
M24C02-RMN6T
3
E2
2
E1
4
VSS
1
E0
5
SDA
6
SCL
7
WC
8
VCC
D3620
MMBD6100
A2
C
A1
D3623
5.6V
D3622
5.5V
ADUC 5S 02 0R5L
OPT
D3621
5.5V
ADUC 5S 02 0R5L
OPT
D3613
5.5V
5.5V
ADUC 5S 02 0R5L
OPT
JK3603
SPG09-DB-010
1
RED
2
GREEN
3
BLUE
4
GND_1
5
DDC_GND
6
RED_GND
7
GREEN_GND
8
BLUE_GND
9
NC
10
SYNC_GND
11
GND_2
12
DDC_DATA
13
H_SYNC
14
V_SYNC
15
DDC_CLOCK
16
SHILED
JK3602
2F01TC1-CLM97-4F
3
VIN
2
VCC
1
GND
4
SHIELD
D3625
5.6V
OPT
PC_L_IN
PC_R_IN
D3624
5.6V
OPT
JK3604
PEJ027-04
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
JP3605
JP3606
JP3607
RGB PC
SPDIF OUT
36
JACK HIGH / MID
2011.09.29
Closed to JACK
xxLT760H-UA
PC AUDIO
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.
C3802
0.1uF
C3803
0.1uF
+3.5V_ST
IR_OUT
R3814
4.7K
OPT
C3801
0.1uF
JK3803
SPG09-DB-009
1
2
3
4
5
6
7
8
9
10
IC3800
MAX3232CDR
EAN41348201
3
C1-
2
V+
4
C2+
1
C1+
6
V-
5
C2-
7
DOUT2
8
RIN2
9
ROUT2
10
DIN2
11
DIN1
12
ROUT1
13
RIN1
14
DOUT1
15
GND
16
VCC
R3811
4.7K
OPT
JP3809
C3800
0.1uF
JP3808
R3821
100
R3820
100
+3.5V_ST
EXT_12V
+3.5V_ST
RS232_RX
RS232_TX
D3804
20V
OPT
D3805
20V
OPT
L3802
L3801
L3800
OPT
EXT_5V
R3806
1K
AV1_CVBS_IN
R3803
2.7K
JK3800
PPJ233-01
4A
[YL]O-SPRING
5A
[YL]E-LUG
3A
[YL]CONTACT
4B
[WH]C-LUG
5C
[RD]E-LUG
4C
[RD]O-SPRING
3C
[RD]CONTACT
AV1_L_IN
+3.3V_NORMAL
AV1_R_IN
AV1_CVBS_DET
C3804
0.1uF
D3803
50V
BAP70-02
R3834
1K
D3800
5.6V
5.6V
D3801
5.6V
5.6V
D3802
5.6V
5.6V
JP3800
JP3801
JP3802
JP3803
JP3805
JP3806
JP3804
RS232C
38
JACK_COMMON
2011.09.29
1A@5V /1A@12V FOR COMMERCIAL(RS-232C POWER)
FOR COMMERCIAL
CVBS1 REAR JACK
xxLT760H-UA
L-MONO
ESD For MTK
: D3800, D3801, D3802
: D3800, D3801, D3802
Click on the first or last page to see other 42LT770H (CHASSIS:LA2FF) service manuals if exist.