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LG 55LB5500, Service Manual

The LG 55LB5500 is a high-quality television equipped with innovative features for an immersive viewing experience. To ensure optimal usage and troubleshooting, a comprehensive Service Manual is available for download free of charge from manualshive.com. Access this invaluable manual and unlock the full potential of your LG 55LB5500.

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Fiber Optic

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.

COMP_L_IN

IC401

MM1756DURE

CVBS_OUT

3

BIAS

2

GND

4

OUT

1

IN

6

VCC

5

PS

+3.3V_NORMAL

R406
10K

AV_DET

R409
10K

COMP_R_IN

C402

1000pF

50V

OPT

C411
0.1uF

CVBS_OUT

C415
0.1uF

CVBS_OUT

+3.3V_NORMAL

R407
12K

COMP_DET

R410

75

CVBS_OUT

R408
12K

4.7uF

C410

CVBS_OUT

R402
470K

DTV/MNT_VOUT

R401
470K

C401

1000pF

50V

OPT

SIDE_USB_DM

SIDE_USB_DP

+5V_USB

P401

3

A

U

0

4

S

-

3

0

5

-

Z

C

-

(

L

G

)

1

2

3

4

5

ZD406
5V

OPT

ZD405

ZD404

ZD402

ZD403

ZD401

ZD400

VR403

OPT

VR401

OPT

IC400

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

C404

0.1uF

C403

0.1uF

JK400

KJA-PH-1-0177

3

M3_DETECT

4

M4

5

M5_GND

1

M1

6

M6

PM_TXD

C406

0.1uF

C400

0.1uF

C405

0.1uF

PM_RXD

+3.5V_ST

D1+_HDMI1

R416

10K

OPT

CK-_HDMI1

VR409

OPT

CK+_HDMI1

HPD1

D2+_HDMI1

D1-_HDMI1

DDC_SCL_1

D0+_HDMI1

VR414

OPT

Q400

MMBT3904(NXP)

E

B

C

DDC_SDA_1

R412

1K

VR405

OPT

5V_DET_HDMI_1

R417

10K

JK404

EAG59023302

14

13

5

D1_GND

20

SHIELD

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

D0-_HDMI1

VR413

OPT

D2-_HDMI1

+5V_NORMAL

CK-_HDMI2

D1-_HDMI2

JK403

EAG62611204

14

NC

13

CE_REMOTE

5

D1_GND

20

BODY_SHIELD

GND

12

CK-

11

CK_GND

2

D2_GND

19

HP_DET

18

5V

10

CK+

4

D1+

1

D2+

17

GND

9

D0-

8

D0_GND

3

D2-

16

DDC_DATA

7

D0+

6

D1-

15

DDC_CLK

DDC_SDA_2

VR408

OPT

5V_DET_HDMI_2

VR404

OPT

D1+_HDMI2

DDC_SCL_2

D0+_HDMI2

D2+_HDMI2

HPD2

D0-_HDMI2

D2-_HDMI2

CK+_HDMI2

VR412

OPT

VR411

OPT

D400

RCLAMP0502BA

OPT

C413
5pF
50V

OPT

C414
5pF
50V

OPT

R413

2.7K

R411

2.7K

R414
4.7K

R415

4.7K

VR402

OPT

VR400

OPT

MHL_CD_SENSE

VR410
OPT

R418
300K

C416

0.047uF

25V

D401

MMBD6100

A

2

C

A

1

+5V_3.5V_ST

5V_HDMI

VR407

OPT

VR406
OPT

D405

IP4283CZ10-TBA

OPT

3

2

4

1

5

6

7

8

9

10

D404

IP4283CZ10-TBA

OPT

3

2

4

1

5

6

7

8

9

10

D402

IP4283CZ10-TBA

OPT

3

2

4

1

5

6

7

8

9

10

D403

IP4283CZ10-TBA

OPT

3

2

4

1

5

6

7

8

9

10

JK401

PPJ245N2-01

5A

[GN/YL]O-SPRING

6A

[GN/YL]E-LUG

4A

[GN/YL]CONTACT

5B

[BL]O-SPRING

7C

[RD1]E-LUG-S

5C

[RD1]O-SPRING

4C

[RD1]CONTACT

5D

[WH]O-SPRING

4E

[RD2]CONTACT

5E

[RD2]O-SPRING

6E

[RD2]E-LUG

+3.3V_NORMAL

JK402

JST1223-001

SPDIF

1

GND

2

VCC

3

VINPUT

4

FIX_POLE

SPDIF_OUT

C412
68pF
50V

SPDIF

C408

1uF
10V

OPT

P400

12507WS-04L

1

2

3

4

5

R400
0

1/16W

5%

OPT

AR400
100
1/16W

AR402

4.7K

1/16W

AR401

10K

1/16W

VA400

ICVS0518150FR_ 

OPT

VA401

ICVS0518150FR_ 

OPT

VA402

ICVS0518150FR_ 

OPT

C407

22uF

10V

C409

22uF

10V

R420
4.7K

R421
4.7K

JP425

JP424

JP422

JP423

L402

HDMI_REAR_EMI_FILTER

DLP11SA900HL2L 

2

1

4

3

L401

HDMI_REAR_EMI_FILTER

DLP11SA900HL2L 

2

1

4

3

L403

HDMI_REAR_EMI_FILTER

DLP11SA900HL2L 

2

1

4

3

L404

HDMI_REAR_EMI_FILTER

DLP11SA900HL2L 

2

1

4

3

R419
33

1/16W
5%

R403

75

1%

comp-shape=3216

R405

75

5%

comp-shape=2012

R404

75

5%

comp-shape=2012

2013.08.13

L14-NON-OS

EXTERNAL INTERFACE

6

COMP/USB/SPDIF

HDMI_1(REAR)

HDMI_2(SIDE)

UART For DEBUG

AV/COMPONENT

USB(SIDE)

CVBS_OUT

MHL Spec

SPDIF OPTIC JACK

ESD Ready

Copyright ⓒ 2014 LG Electronics. Inc. All right reserved. 
Only for training and service purposes

LGE Internal Use Only 

Summary of Contents for 55LB5500

Page 1: ...500 55LB5550 55LB5500 UZ 55LB5550 UY CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ... LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 16 BLOCK DIAGRAM 22 EXPLODED VIEW 23 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...inals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed m...

Page 4: ...lectrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent...

Page 5: ...he solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replace...

Page 6: ...arts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 20 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA IEC specification EMC FCC ICES IEC specification 4 General Specification No Item Specification Result Remark 1 Receiving System 1 ATSC ...

Page 7: ...5LB5500 UZ 9 Operating Environment 1 Temp 0 40 deg 2 Humidity 80 10 Storage Environment 1 Temp 20 60 deg 2 Humidity 85 5 Supported video resolutions 5 1 Component input Y CB PB CR PR No Resolution H freq kHz V freq kHz Pixel clock Proposed 1 720 480 15 73 59 94 13 50 SDTV DVD 480I 2 720 480 15 73 60 00 13 5135 SDTV DVD 480I 3 720 480 31 47 59 94 27 00 SDTV 480P 4 720 480 31 50 60 00 27 027 SDTV 48...

Page 8: ...60 00 74 25 HDTV 1080I 9 1920 1080 26 97 23 976 74 176 HDTV 1080P 10 1920 1080 27 00 24 00 74 25 HDTV 1080P 11 1920 1080 33 71 29 97 74 176 HDTV 1080P 12 1920 1080 33 75 30 00 74 25 HDTV 1080P 13 1920 1080 67 432 59 94 148 352 HDTV 1080P 14 1920 1080 67 50 60 00 148 50 HDTV 1080P PC DDC 1 640 350 31 468 70 09 25 17 EGA X 2 720 400 31 469 70 08 28 32 DOS O 3 640 480 31 469 59 94 25 17 VESA VGA O 4 ...

Page 9: ...d for a period of 20 minutes or longer especially where W B scale is strong Digital pattern 13ch and or Cross hatch pattern 09ch there can some afterimage in the black level area 3 Adjustment items 3 1 Main PCBA Adjustments 1 ADC adjustment ADC adjustment is OTP Auto ADC 2 EDID download HDMI Above adjustment items can be also performed in Final Assembly if needed Both Board level and Final assembl...

Page 10: ...E 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30 50 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 E7 EDID Block 1 Bytes 128 255 80H FFH 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 02 03...

Page 11: ...20 E0 2D 10 10 3E 96 00 40 84 63 00 00 60 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F8 4 2 5 2 AC3 EDID Data 4 2 5 2 1 FHD Model HDMI 1 FHD 8BIT C S E796 EDID Block 0 Bytes 0 127 00H 7FH 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 10 01 18 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 31 40...

Page 12: ...7 8 9 A B C D E F 0 02 03 1C F1 48 10 22 20 05 84 03 02 01 26 15 07 10 50 09 57 07 67 03 0C 00 20 00 80 1E 02 3A 80 18 20 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D 30 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E 40 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00 50 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84 60 63 00 00 18 00 00 00 00 00 00 00 00 00 00 00 00 70 00 00 00 00 00 00 00 00...

Page 13: ...5 2 Manual adj method 1 Set TV in Adj mode using POWER ON 2 Zero Calibrate the probe of Color Analyzer then place it on the center of LCD module within 10cm of the surface 3 Press ADJ key EZ adjust using adj R C 6 White Balance then press the cursor to the right KEY When KEY is pressed 204 Gray 80IRE internal pattern will be displayed 4 One of R Gain G Gain B Gain should be fixed at 192 and the re...

Page 14: ...13 329 329 target 276 277 291 296 318 336 340 5 2 Option selection per country 5 2 1 Overview 1 Tool option selection is only done for models in Non USA North America due to rating 2 Applied model LA32B Chassis applied to CANADA and MEXICO 5 2 2 Country Group selection 1 Press ADJ key on the Adj R C and then select Country Group Menu 2 Depending on destination select US then on the lower Country o...

Page 15: ...ecification No Item Min Typ Max Unit Remark 1 Audio practical max Output L R Distortion 10 max Output 4 5 6 0 5 0 6 3 6 0 6 9 W Vrms 1 Measurement condition EQ AVL Clear Voice Off 2 Speaker 8Ω Impedance LB55 Series 9 0 8 5 10 9 9 3 12 0 9 8 W Vrms 1 Measurement condition EQ AVL Clear Voice Off 2 Speaker 8Ω Impedance LB56 Series USB S W Download option Service only 1 Put the USB Stick to the USB so...

Page 16: ...ar IC101 or Main board Check Multi Voltage P401 9 10pin 24V 13 14 15pin 12V Replace Power Board Check DRV ON Control P401 2 pin High Check Power Board Check IC402 3 4 Output Voltage IC402 2 5V IC403 1 5V IC404 1 15V Q403 3 3V Replace IC402 IC403 IC404 Q403 Re download software Check stand by Voltage L401 L404 3 5V Replace L401 L404 Check LVDS Power Voltage Q409 12V Replace Q409 Check Mstar LVDS Ou...

Page 17: ... pin 1 8V Check IF_P N Signal TU3700 10 11 Pin Replace IC3703 Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok ok ok ok No No No No Bad Tuner Replace Tuner 3 AV Video Check inputsignal format Is it supported Check AV Cable for damage for damage or open conductor Check JK1701 CVBS Signal Line R1707 ok ok ok No Replace Jack ok Check CVBS_DETSignal Replace R1713 No Check Mstar LVDS Output...

Page 18: ...o Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok No 5 HDMI Video Check inputsignal format Is it supported Check HDMICable conductors for damage or open conductor Check EDID R810 R811 R815 R816 I2C Signal Check JK800 JK801 ok ok ok No No Replace the defective IC or re download EDID data ok Replace Jack Check HDMISignal Check other set If no problem check signal line ok No Check Mstar ...

Page 19: ... MHL Cable conductors for damage or open conductor Check MHL Signal R214 R215 Check JK801 ok ok ok No No Replace the defective IC or re download EDID data ok Replace Jack Check MHL Signal Check other set If no problem check signal line ok No Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok No Replace Main Board No Check CD_Sense Cbus Vbus No Replace R817 C800 ...

Page 20: ... ok No Check Connector P5600 Replace connector if found to be damaged ok No Check speaker resistance and connector damage Replace speaker ok No Off Toggle the Menu Check AMP IC IC5600 Power 24V 3 3V No Replace Amp IC IC5600 Check Mstar I2S Output IC5600 20 21 22 Pin No Check signal line Or replace Mstar IC101 Check Mstar AUDIO_MASTER_CLK R148 No Replace Mstar IC101 or Main Board ok Check AMP I2C L...

Page 21: ...wer IC3703 2 pin 1 8V Check IF_P N Signal TU3700 10 11 Pin Replace IC3703 ok ok ok No No No Bad Tuner Replace Tuner 9 AV Audio Check AV Cable for damage for damage or open conductor Check JK1702 Signal Line R1714 R1715 ok ok No Replace Jack Follow procedure 7 All source audio trouble shooting guide 10 Component Audio Check Component Cable for damage or open conductor Check JK1702 Signal Line R1714...

Page 22: ...ck DEMOD X tal 24MHz Serial Flash 8M x 8bit DDR2 64Mbit IF AV COMP Hybrid Y CVBS Cb Cr AV COMP DVI L R L R HDMI TMDS DDC Video Front End Audio Front End HDMI RX LVDS out HD FHD HD SD Video Encoder TAS5733 Digital AMP I2S MCLK Audio DSP H P out L R UART RX TX Air Cable On board USB USB2 0 LVDS Con HD FHD IF ATSC Analog Demod IF NTSC EEPROM 64K x 8bit H P SPDIF ...

Page 23: ...stics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 200 820 410 530 540 521 350 900 121 120 400 LV1 A2 A10 ...

Page 24: ...B_ODD 1 LVA4 LLV6 69 B_ODD 2 LVA3 LLV5 70 B_ODD 3 LVA3 LLV5 71 B_ODD 4 LVACLK LLV4 72 B_ODD 5 LVACLK LLV4 73 B_ODD 6 LVA2 LLV3 CLK 74 B_ODD 7 LVA2 LLV3 CLK 75 G_ODD 0 LVA1 LLV2 EPI0 76 G_ODD 1 LVA1 LLV2 EPI0 77 G_ODD 2 LVA0 LLV1 EPI1 78 G_ODD 3 LVA0 LLV1 EPI1 79 G_ODD 4 LVB4 LLV0 EPI2 80 G_ODD 5 LVB4 LLV0 EPI2 81 G_ODD 6 LVB3 RLV6 EPI3 82 G_ODD 7 LVB3 RLV6 EPI3 83 R_ODD 0 LVBCLK RLV5 EPI4 84 R_ODD...

Page 25: ...0uF 16V C202 10uF 10V C227 22uF 16V R224 15K C212 100pF 50V OPT MHL_OCP_DET R222 100K C218 0 047uF 25V R218 4 7K OPT C223 82pF 50V USB1_OCD 5V_USB C213 4700pF 50V R226 10 5V_NORMAL AVDD_5V_MHL D200 30V MBR230LSFT1G MHL_5V_EN R220 4 7K C216 10uF 16V 5V_HDMI R221 0 OPT 3 3V_NORMAL USB1_CTL R227 3 3K 1 R225 100K OPT TPS65282REGR IC201 1 EN 3 SS 7 FAULT2 9 SW_OUT2 10 RLIM 11 AGND 12 SW_OUT1 13 SW_IN_1...

Page 26: ...12 18K 1 R315 470 SPK_R 24V_AMP IC300 TAS5733 1 OUT_A 2 PVDD_AB_1 3 PVDD_AB_2 4 BST_A 5 NC_1 6 SSTIMER 7 NC_2 8 PBTL 9 AVSS 10 PLL_FLTM 11 PLL_FLTP 12 VR_ANA 13 AVDD 14 A_SEL_FAULT 15 MCLK 16 OSC_RES 17 DVSSO 18 VR_DIG 19 PDN 20 LRCLK 21 SCLK 22 SDIN 23 SDA 24 SCL 25 RESET 26 STEST 27 DVDD 28 DVSS 29 GND 30 AGND 31 VREG 32 GVDD_OUT 33 BST_D 34 PVDD_CD_1 35 PVDD_CD_2 36 OUT_D 37 PGND_CD_1 38 PGND_C...

Page 27: ... D2 17 GND 9 D0 8 D0_GND 3 D2 16 DDC_DATA 7 D0 6 D1 15 DDC_CLK DDC_SDA_2 VR408 OPT 5V_DET_HDMI_2 VR404 OPT D1 _HDMI2 DDC_SCL_2 D0 _HDMI2 D2 _HDMI2 HPD2 D0 _HDMI2 D2 _HDMI2 CK _HDMI2 VR412 OPT VR411 OPT D400 RCLAMP0502BA OPT C413 5pF 50V OPT C414 5pF 50V OPT R413 2 7K R411 2 7K R414 4 7K R415 4 7K VR402 OPT VR400 OPT MHL_CD_SENSE VR410 OPT R418 300K C416 0 047uF 25V D401 MMBD6100 A2 C A1 5V_NORMAL ...

Page 28: ...AGC_MAIN IF_P_MSTAR IF_N_MSTAR C504 15pF 50V C501 15pF 50V C500 100pF 50V 3 3V_TU C503 0 1uF 16V TU500 TDSS H701F 5 B1 3 3V 11 DIF N 2 NC_2 10 DIF P 4 SDA 1 NC_1 9 IF_AGC 8 NC_5 3 SCL 7 NC_4 6 NC_3 12 SHIELD A1 A1 B1 B1 AR500 33 1 16W R501 33 1 16W 5 R500 33 1 16W 5 L500 PZ1608U121 2R0TF L14 NON OS 2013 08 13 TUNER 3 3V_NORMAL 3 3V_TU TUNER for ATSC W O Isolator close to the tuner pin Close to the...

Page 29: ......

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