LG 55UF6790 Service Manual Download Page 44 | Manualshive

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THERMAL

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.

NTP_AMP

2015-01-08

58

LM14A

C5814

390pF

50V

L5803-*1

10.0uH

GET_AMP_COIL

SM-6045-100

SPK_R+

I2C_SCL4

C5807

22000pF

50V

AUD_SCK

L5803
10.0uH

NRS6045T100MMGK

TAIYO_AMP_COIL

L5802-*1

10.0uH

GET_AMP_COIL

SM-6045-100

+24V_AMP

R5808

3.3

1/10W

5%

C5818
1uF
10V

R5814

4.7K

C5820

0.47uF

50V

TP5801

R5800

10K

Q5800-*1

MMBT3904(NXP)

NXP_AMP_MUTE_TR

E

B

C

AUD_LRCK

10uF

C5809

35V

WOOFER_MUTE

C5813

390pF

50V

+3.3V_NORMAL

0.1uF

C5821

50V

C5817
1uF
10V

SPK_L-

10uF

C5810

35V

C5802
33pF
50V

R5807

3.3

1/10W

5%

WOOFER_MUTE

R5813

4.7K

Q5800

2N3904S

KEC_AMP_MUTE_TR

E

B

C

R5801

10K

TP5802

C5819

0.47uF

50V

R5809

3.3

1/10W

5%

C5815

390pF

50V

AMP_MUTE

C5816

390pF

50V

R5810

3.3

1/10W

5%

L5802
10.0uH

NRS6045T100MMGK

TAIYO_AMP_COIL

C5801
1uF
10V

SPK_L+

L5805
10.0uH

NRS6045T100MMGK

TAIYO_AMP_COIL

IC5800

NTP7515

3

NC_2

2

VDD_PLL

4

GND

1

NC_1

6

DVDD

5

NC_3

7

SDATA

8

WCK

9

NC_4

10

SDA

11

SCL

12

FAULT

13

MONITOR_0

14

MONITOR_1

15

MONITOR_2

16

BST2B

17

PGND2B

18

OUT2B

19

PVDD2B

20

PVDD2A

21

OUT2A

22

PGND2A

23

BST2A

24

VDR2

25

AGND

26

NC_5

27

VDR1

28

BST1B

29

PGND1B

30

OUT1B

31

PVDD1B

32

PVDD1A

33

OUT1A

34

PGND1A

35

BST1A

36

RESET

37

AD

38

CLK_I

39

GND_IO

40

VDD_IO

41

[EP]GND

0.1uF

C5824

50V

SPK_R-

C5811
22000pF

50V

SPK_L-

L5805-*1

10.0uH

GET_AMP_COIL

SM-6045-100

I2S_AMP

L5804
10.0uH

NRS6045T100MMGK

TAIYO_AMP_COIL

I2S_AMP

+24V_AMP

C5808

22000pF

50V

P5800

WAFER-ANGLE

1

2

3

4

AMP_RESET_N

0.1uF

C5805

16V

R5811

4.7K

AR5800

100

R5812

4.7K

+3.3V_NORMAL

R5806

4.7K

SPK_L+

C5803

1000pF

50V

L5804-*1

10.0uH

GET_AMP_COIL

SM-6045-100

C5800

1uF

10V

R5804

100

AUD_LRCH

R5805
100

1/16W

I2C_SDA4

0.1uF

C5822

50V

L5801

PZ1608U121-2R0TF

C5806
1000pF
50V

SPK_R+

C5804
33pF
50V

C5812
22000pF
50V

SPK_R-

0.1uF

C5823

50V

AUDIO AMP(NTP7515)

SPEAKER_R

4P Box type

SPEAKER_L

0x54

BSD-15Y-LM14A-058_00-HD

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Summary of Contents for 55UF6790

Page 1: ...ODEL 55UF6790 55UF6790 UB 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: ...l rights reserved Only for training and service purposes CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 BLOCK DIAGRAM 21 EXPLODED VIEW 30 SCHEMATIC CIRCUIT DIAGRAM APPENDIX TROUBLESHOOTING GUIDE APPENDIX ...

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: ...e 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 CE IEC specification EMC FCC ICES CE IEC specification Wireless Wireless HD Specification Option No Item Specification Remark 1 Market North America 2 Broadcasting system ATSC NTSC M 64 256 QAM 3 Available Channel 1 VHF 2 13 2 UHF 14 69 3 DTV ...

Page 7: ...72 59 94 74 176 HDTV 1080I 9 1920 1080 67 500 60 148 50 HDTV 1080P 10 1920 1080 67 432 59 94 148 352 HDTV 1080P No Resolution H freq kHz V freq kHz Pixel clock MHz Proposed HDMI PC DDC 1 640 350 31 46 70 09 25 17 EGA Х 2 720 400 31 46 70 08 28 32 DOS O 3 640 480 31 46 59 94 25 17 VESA VGA O 4 800 600 37 87 60 31 40 00 VESA SVGA O 5 1024 768 48 36 60 00 65 00 VESA XGA O 6 1152 864 54 34 60 05 80 00...

Page 8: ...DTV 1080P 12 1920 1080 26 97 23 976 74 176 HDTV 1080P 13 1920 1080 33 75 30 000 74 25 HDTV 1080P 14 1920 1080 33 71 29 97 74 176 HDTV 1080P 15 3840 2160 67 5 30 00 297 00 UDTV 2160P 16 3840 2160 61 43 29 97 296 703 UDTV 2160P 17 3840 2160 56 25 25 00 297 00 UDTV 2160P 18 3840 2160 54 0 24 00 297 00 UDTV 2160P 19 3840 2160 53 95 23 98 296 703 UDTV 2160P 20 3840 2160 135 59 94 594 UDTV 2160P HDMI 1 ...

Page 9: ...formed in Final Assembly if needed Both Board level and Final assembly adjustment items can be check using In Start Menu 1 ADJUST CHECK 3 2 Final assembly adjustment White Balance adjustment RS 232C functionality check PING Test Factory Option setting per destination Ship out mode setting In Stop 3 3 Etc Ship out mode Service Option Default USB Download S W Update Option Service only ISP Download ...

Page 10: ...evine 4 Play START 5 Check of result Ready Test OK or NG 4 2 4 Communication Port connection 1 Connect PCBA Jig RS 232C Port PC RS 232C Port 4 2 5 Download 1 AJ JA Models 15Y LCD TV MAC Widevine ESN HDCP2 0 4 3 LAN Inspection 4 3 1 Equipment Condition Each other connection to LAN Port of IP Hub and Jig 4 3 2 LAN inspection solution LAN Port connection with PCB Network setting at MENU Mode of TV Se...

Page 11: ...erated by Manufacturing Technology Group C Serial number D L must be conformed when it is produced in production line because serial number D L is mandatory by D book 4 0 Manual Download Model Name and Serial Number If the TV set is downloaded By OTA or Service man sometimes model name or serial number is initialized not always It is impossible to download by bar code scan so It need Manual downlo...

Page 12: ...DID data is used EDID download JIG HDMI cable and D sub cable are not need Adjust remocon 5 2 3 Download method 1 Press Adj key on the Adjust remocon then select 12 EDID D L By pressing Enter key enter EDID D L menu 2 Select Start button by pressing Enter key HDMI1 HDMI2 HDMI3 HDMI4 are Writing and display OK or NG 5 2 4 EDID DATA Reference HDMI1 HDMI3 HDMI1 HDMI4 In the data of EDID bellows may b...

Page 13: ...rposes DTS HDMI2 C S A0 E3 _6G_2D ONLY_UHD Deep Color ON DTS HDMI1 C S E6 80 _3G_2D ONLY_UHD Deep Color OFF DTS HDMI2 C S E6 70 _3G_2D ONLY_UHD Deep Color OFF DTS HDMI3 C S E6 60 _3G_2D ONLY_UHD Deep Color OFF AC3 HDMI1 C S A0 FC _6G_2D ONLY_UHD Deep Color ON AC3 HDMI2 C S A0 EC _6G_2D ONLY_UHD Deep Color ON ...

Page 14: ...rposes AC3 HDMI1 C S A0 FC _6G_2D ONLY_UHD Deep Color ON AC3 HDMI2 C S A0 EC _6G_2D ONLY_UHD Deep Color ON AC3 HDMI1 C S E6 89 _3G_2D ONLY_UHD Deep Color OFF AC3 HDMI2 C S E6 79 _3G_2D ONLY_UHD Deep Color OFF AC3 HDMI3 C S E6 69 _3G_2D ONLY_UHD Deep Color OFF PCM HDMI1 C S A0 6E _6G_2D ONLY_UHD Deep Color ON ...

Page 15: ...rica models Checksum HDMI 1 2 3 4 2D DTS AC3 PCM HDMI1 E6 80 A0 F3 E6 89 A0 FC E6 FB A0 6E HDMI2 E6 70 A0 E3 E6 79 A0 EC E6 EB A0 5E HDMI3 E6 60 E6 69 E6 DB 5 3 Camera Port Inspection 1 Objective To check how it connects between Camera and PCBA normally and their Function 2 Test Method This Inspection is available only Power Only Status i Push Camera Up ii Camera s Preview picture appears on TV Se...

Page 16: ...he Display 3 Connect Cable RS 232C to USB 4 Select Model in V com adj Program and begin V com adj 5 When V com adj is complete OK 6 Remove probe and RS 232C to USB cable to complete adj V com Adj must begin as start command va 00 00 and finish as end command wb 00 ff V com adjust data 5 4 5 1 Manual adj method TBD 5 5 White Balance Adjustment 5 5 1 Overview 5 5 1 1 W B adj Objective How it works 1...

Page 17: ...rm Medium Cool 6 Remove probe and RS 232C to USB cable to complete adj W B Adj must begin as start command wb 00 00 and finish as end command wb 00 ff and Adj offset if need 5 5 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 7 White Ba...

Page 18: ... 284 294 303 321 343 4 10 19 277 280 292 299 319 339 5 20 35 275 277 290 296 317 336 6 36 49 274 274 289 293 316 333 7 50 79 273 272 288 291 315 331 8 80 119 272 271 287 290 314 330 9 Over 120 271 270 286 289 313 329 Use only AUO INX Sharp CSOT BOE Cool temp Spec is 13000K 5 6 Local Dimming Function Check Step 1 Turn on TV Step 2 At the Local Dimming mode module Edge Backlight moving right to left...

Page 19: ...nsert 2 Perform GND Internal Pressure auto check Unit fully inserted Power cord Antenna cable and A V arrive to the auto check process Connect D terminal to AV JACK TESTER Auto CONTROLLER GWS103 4 ON Perform GND TEST If NG Buzzer will sound to inform the operator If OK changeover to I P check automatically Remove CORD A V form AV JACK BOX Perform I P test If NG Buzzer will sound to inform the oper...

Page 20: ...ow the message Copying files from memory 4 Updating is staring 5 Updating Completed The TV will restart automatically 6 If your TV is turned on check your updated version and Tool option If downloading version is more high than your TV have TV can lost all channel data In this case you have to channel recover If all channel data is cleared you didn t have a DTV ATV test on production line After do...

Page 21: ... 21 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes BLOCK DIAGRAM 1 LM14A URSA11 Circuit Block Diagram ...

Page 22: ... 22 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 2 LM14A I2C Block Diagram ...

Page 23: ... 23 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 3 URSA11 Block Diagram ...

Page 24: ... 24 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 4 LM14A URSA11 Power Block Diagram ...

Page 25: ... 25 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 5 Tuner CI Block Diagram ...

Page 26: ... 26 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 6 Video Audio In Block Diagram ...

Page 27: ... 27 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 7 Audio Out Block Diagram ...

Page 28: ... 28 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 8 HDMI ...

Page 29: ... 29 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 9 USB WIFI M REMOTE UART ...

Page 30: ...haracteristics 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 Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 200 400 540 521 800 350 121 120 820 530 A10 A2 Stand screw...

Page 31: ... GPIO23 TX3 GPIO78 AA4 GPIO24 RX3 GPIO79 W6 DIM2 TX4 GPIO112 F14 DIM3 RX4 GPIO113 F12 GPIO2 GPIO57 AJ27 GPIO28 SCK0 GPIO83 AJ7 GPIO29 SDA0 GPIO84 AH8 DDCR_CK SCK3 GPIO54 E11 DDCR_DA SDA3 GPIO53 E10 GPIO30 SCK4 GPIO85 AJ6 GPIO31 SDA4 GPIO86 AG8 GPIO32 SCK5 GPIO87 AH7 GPIO33 SDA5 GPIO88 AJ8 VID0 GPIO50 L6 VID1 GPIO51 M6 LED0 GPIO29 AD5 LED1 GPIO30 AD4 WOL_INT_OUT GPIO GPIO52 AB5 LVSYNC VX1_0 AF32 LH...

Page 32: ...C_CPU_9 W23 VDDC_CPU_10 W24 VDDC_CPU_11 W25 VDDC_CPU_12 Y23 VDDC_CPU_13 Y24 VDDC_CPU_14 Y25 VDDC_CPU_15 AA22 VDDC_CPU_16 AA23 VDDC_CPU_17 AA24 VDDC_CPU_18 AA25 VDDC_CPU_19 AB24 VDDC_CPU_20 AB25 MCP_VDDC_1 AE16 MCP_VDDC_2 AF16 DVDD_NODIE L13 DVDD_DDR_1 K21 DVDD_DDR_2 N21 DVDD_DDR_3 M21 DVDD_DDR_4 L21 VDDC_24 AC17 VDDC_25 AC18 VDDC_26 AC19 VDDC_27 AC20 VDDC_28 AC21 VDDC_29 AC22 VDDC_30 AD17 VDDC_31 ...

Page 33: ...DQS2 M1_DDR_CASN C475 0 1uF C455 0 1uF M0_DDR_BA1 M0_DDR_DQ17 M1_DDR_RESET_N IC402 AP2303MPTR G1 3 VREFEN 2 GND 4 VOUT 1 VIN 5 NC_1 6 VCNTL 7 NC_2 8 NC_3 9 EP C427 0 1uF M1_DDR_DQ12 M0_DDR_DQ29 M0_DDR_DQ0 M1_DDR_A7 M0_DDR_DQ30 AVDD_DDR M0_DDR_A0 M0_DDR_A11 M1_DDR_RASN M0_DDR_DQS_N3 M1_DDR_DQS0 M0_DDR_A4 M0_DDR_A2 M1_DDR_RASN K4B4G1646D BCMA IC404 1 SS_DDR3_4Gb_25n EAN63391401 A0 N3 A1 P7 A2 P3 A3 ...

Page 34: ...CK _HDMI1 D0 _HDMI1 C631 0 047uF R626 33 SSUSB_TXN AUD_SCK R644 0 TCK0 C612 1000pF OPT 50V C616 0 047uF USB_DP3 C618 0 047uF SC_B BIT7 SOC_RESET USB_DP1 SC_FB COMPENSATION_DONE_1 C613 0 047uF SCART_Lout EPHY_RDN MHL_OCP IC100 LGE5332 LM14A A_RX0N T2 A_RX0P T3 A_RX1N U1 A_RX1P V2 A_RX2N V3 A_RX2P W2 A_RXCN R1 A_RXCP R2 DDCDA_CK GPIO38 R6 DDCDA_DA GPIO39 T5 HOTPLUGA Y2 CEC0 GPIO5 V6 HOTPLUGA_HDMI20_...

Page 35: ..._160 T9 GND_161 T10 GND_162 T14 GND_163 T15 GND_164 T16 GND_165 T17 GND_166 T18 GND_167 T19 GND_168 T20 GND_169 T21 GND_170 T22 GND_171 T23 GND_172 T24 GND_173 T25 GND_174 T26 GND_175 U2 GND_176 U3 GND_177 U8 GND_178 U9 GND_179 U10 GND_180 U14 GND_181 U15 GND_182 U16 GND_183 U17 GND_184 U18 GND_185 U20 GND_186 U26 GND_187 V1 GND_188 V8 GND_189 V9 GND_190 V10 GND_191 V11 GND_192 V12 GND_193 V13 GND...

Page 36: ...6 KIC7529M2 RESET_IC_KEC MULTI 1 GND 2 OUT 3 VCC C2323 0 1uF 16V R2322 22K 1 C2342 10uF 10V 3 3V_NORMAL L2303 BLM18PG121SN1D R2303 1K 1 ZD2300 DCDC_Diode C2317 22uF 10V IC2301 AZ1117EH ADJTRG1 ADJ GND OUT IN C2318 0 1uF 25V 5V_NORMAL 12V C2321 22uF 10V R2324 15K 1 16W 1 C2343 82pF 50V IC2300 1 TPS54327DDAR TI_TPS54327_1 5V_DDR_DCDC 3 VREG5 2 VFB 4 SS 1 EN 5 GND 6 SW 7 VBST 8 VIN 9 EP GND C2310 10u...

Page 37: ...4427DDA 3 VREG5 2 VFB 4 SS 1 EN 5 GND 6 SW 7 VBST 8 VIN 9 EP GND R2522 11K 1 1 1V_VDDC_CPU C2517 0 1uF 16V Q2503 1 2N7002K DIODEDS_CPU_CORE_VID_FET SUB S D G 12V R2517 10K Q2503 2N7002KA KEC_CPU_CORE_VID_FET MAIN G D S C2513 0 1uF 16V OPT C2518 22uF 10V C2516 2200pF 50V R2523 10K 1 CPU_VID1 C2510 10uF 16V UF77 C2519 22uF 10V R2520 1 6K 1 ZD2500 DCDC_DIODE_0DTKE00018A KEC 0DTKE00018A ZD2501 DCDC_DI...

Page 38: ...KU_MICOM_CRYSTAL SUB R3032 10K AMP_MUTE AR3000 3 3K EYE_Q 3 5V_ST C3001 0 47uF CEC_REMOTE R3021 1 1K OLED POWER_ON OFF2_4 3 5V_ST R3034 120K IR X3000 32 768KHz DAISHINKU_MICOM_CRYSTAL SUB EAW58239602 RL_ON C3004 0 1uF 16V WOL_WAKE_UP LOGO_LIGHT SW3000 JTP 1127WEM MICOM_RESET_SW 1 2 4 3 R3029 33 MICOM_RESET_22OHM MHL_DET_LM15 R3000 100 SIDE_HP_MUTE MICOM_RESET WOL WIFI_POWER_ON 3D L_DIM_EN KEY1 MOD...

Page 39: ...NXP NXP_HDMI_HPD_2_TR E B C D3308 MMBD6100 SUZHOU_DDC_DIODE MAIN EAH61714301 A2 C A1 R3337 33 OPT R3338 33 OPT D1 _HDMI1 R3318 1K OPT Q3301 2N3904S KEC_HDMI_HPD_2_TR E B C AR3300 5 1 1 16W 5V_HDMI_3 R3335 3 3K CK _HDMI1 5V_NORMAL D0 _HDMI1 DDC_SCL_3 D0 _HDMI1 5V_HDMI_2 CK _HDMI3 AR3301 5 1 1 16W VA3302 ESD_HDMI HDMI_HPD_1 VA3305 ESD_HDMI R3323 4 7K HDMI_EXT_EDID HDMI_HPD_2 D1 _HDMI2 5V_HDMI_1 D2 _...

Page 40: ...nt jack 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 VA3801 5 6V VA3805 5 5V R3800 470K C3811 47pF 50V R3813 10K 3 3V_NORMAL COMP1_Pb 3 3V_NORMAL COMP1_DET VA3804 5 5V R3831 0 R3807 10K VA3802 5 6V COMP1_Pr C3822 150pF OPT AV1_CVBS_DET C3801 560pF 50V OPT C3806 100pF 50V OPT...

Page 41: ... 1uF 16V OPT R4111 100 WIFI_BT_COMBO IR C4110 22uF 10V EYE_SCL R4103 330 1 16W 5 IR_PROTO C4109 5pF 50V 3 5V_ST P4100 SMAW200 H14S5K 14 14 9 9 4 4 13 13 8 8 3 3 12 12 7 7 2 2 11 11 6 6 1 1 10 10 5 5 15 15 LED_R C4111 0 1uF OPT C4108 0 1uF C4112 0 1uF OPT C4107 5pF 50V M_RFModule_RESET 3 3V_NORMAL IC4101 AO R123C7G LG IR_PROTO G GND V VS O OUT 3 5V_ST KEY1 C4105 100pF 50V WIFI_DP AR4100 100 1 16W E...

Page 42: ... 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 USB 2015 01 21 43 UF64 6800 USB_DP3 D4302 DF3D6 8MS 5V_USB_3 USB_DM3 C4323 22uF 10V JK4302 3AU04S 305 ZC LG 1 2 3 4 5 C4322 10uF 10V R4300 2 2 R4301 2 2 D4301 USB1 MAX 1 0A ...

Page 43: ... VA5002 5 5V LAN_ESD MAIN JK5000 1 BS RV30330 NEW_LAN_JACK_ESD 1st EAG35781015 U D ELECTRONIC CORP 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 C5001 0 01uF 50V VA5000 5 5V LAN_ESD MAIN EPHY_RDP VA5000 1 ICVS0518150FR_ LAN_ESD SUB VA5001 1 ICVS0518150FR_ LAN_ESD SUB VA5002 1 ICVS0518150FR_ LAN_ESD SUB VA5003 1 ICVS0518150FR_ LAN_ESD SUB JK5000 2 36TM9G 30150 02HF NEW_LAN_JACK_3SIM T 36TM9G_30150_02HF FREEP...

Page 44: ...C5816 390pF 50V R5810 3 3 1 10W 5 L5802 10 0uH NRS6045T100MMGK TAIYO_AMP_COIL C5801 1uF 10V SPK_L L5805 10 0uH NRS6045T100MMGK TAIYO_AMP_COIL IC5800 NTP7515 3 NC_2 2 VDD_PLL 4 GND 1 NC_1 6 DVDD 5 NC_3 7 SDATA 8 WCK 9 NC_4 10 SDA 11 SCL 12 FAULT 13 MONITOR_0 14 MONITOR_1 15 MONITOR_2 16 BST2B 17 PGND2B 18 OUT2B 19 PVDD2B 20 PVDD2A 21 OUT2A 22 PGND2A 23 BST2A 24 VDR2 25 AGND 26 NC_5 27 VDR1 28 BST1B...

Page 45: ...SET1_TU FE_DEMOD1_TS_DATA 4 C6513 18pF 50V OPT C6518 10uF 10V TU_M W L6505 PZ1608U121 2R0TF TU_M W R6517 200 TU_ALL_2178B LNB_OUT C6515 1uF 25V TU_M W FE_DEMOD1_TS_DATA 5 FE_DEMOD1_TS_ERROR R6506 1K TU_ALL_IntDemod RF_SWITCH_CTL_TU FE_DEMOD1_TS_CLK IF_AGC Q6502 1 MMBT3906 NXP NXP_TU_ALL_2178B_TR E B C I2C_SCL5_TU 3 3V_LNA_TU LNB_TX FE_DEMOD1_TS_CLK R6500 10K TU_M W TU_CVBS_TU C6512 18pF 50V OPT C6...

Page 46: ...DATA 5 FE_DEMOD1_TS_DATA 7 FE_DEMOD1_TS_DATA 4 FE_DEMOD1_TS_DATA 1 TU6702 TDJM G301D TU_M_EU 1 3 3V 2 NC_1 3 AIF_AGC 4 SCL_RF 5 SDA_RF 6 AIF P 7 AIF N 8 SIF 9 CVBS 10 NC_2 11 3 3V_RF 12 ERROR 13 GND_1 14 MCLK 15 SYNC 16 VALID 17 D0 18 D1 19 D2 20 D3 21 D4 22 D5 23 D6 24 D7 25 RESET_DEMOD 26 3 3V_DEMOD 27 SCL_DEMOD 28 1 2V_DEMOD 29 NC_3 30 SDA_DEMOD 31 LNB 47 SHIELD 32 GND B1 B1 A1 A1 TU_RESET1_TU ...

Page 47: ...Pullup_TR E B C R7109 10K OPT R7119 33 OPT 3 3V_NORMAL Q7100 1 2N7002K DIODES_LGD INX_Module_TCON_I2C_EN_FET SUB EBK42767801 S D G R7128 10K LOCKAn_HTPDAn_3 3VPullup Q7102 2N3904S KEC_LOCKAn_HTPDAn_3 3VPullup_TR E B C AR7101 0 1 16W Module_LGD_INX_CSHOT_MPLUS TXDAP6_L I2C_SDA6 R7113 0 Module_MPLUS HTPDAn TCON_I2C_EN R7100 0 Module_MPLUS 3D L_DIM_EN R7103 0 R7123 10K Module_LGD120Hz_SHARP R7132 10K...

Page 48: ...93 N8 NC_94 N9 NC_95 N10 NC_96 N11 NC_97 N12 NC_98 N13 NC_99 N14 NC_100 P1 NC_101 P2 NC_102 P8 NC_103 P9 NC_104 P11 NC_105 P12 NC_106 P13 NC_107 P14 C8106 2 2uF 10V C8105 0 1uF 16V DVDD18_EMMC C8103 2 2uF 10V R8106 0 EMMC_CLK_BALL AR8103 10K 1 16W C8102 0 1uF 16V C8109 2 2uF 10V OPT EMMC_CMD_BALL DAT6 IC8100 1 THGBMBG6D1KBAIL EMMC5 0_8G_TOSHIBA DAT0 A3 DAT1 A4 DAT2 A5 DAT3 B2 DAT4 B3 DAT5 B4 DAT6 ...

Page 49: ... HAZARDS WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC 2015 01 23 CLIP Vx1_CAP 135 LM14A EAG64250901 M13501 OPT EAG64250901 M13502 OPT C13500 22uF C13501 22uF CLIP Top Side for Covershield LM14A URSA11 UF68 64 CLIP 1 PUSH TYPE Heatsink guide cap ...

Page 50: ...711 GASKET_8 0X6 0X10 5H SMD_BOT_LAN_10 5T MDS62110225 M13714 GASKET_8 0X6 0X10 5H SMD_BOT MDS62110225 M13712 GASKET_8 0X6 0X10 5H SMD_BOT_USB_10 5T MDS62110225 M13713 GASKET_8 0X6 0X10 5H SMD_BOT_COMP_10 5T MDS62110225 M13710 GASKET_8 0X6 0X10 5H SMD_BOT_2_10 5T MDS62110225 M13716 GASKET_8 0X6 0X10 5H SMD_BOT_TU1 MDS62110225 M13717 GASKET_8 0X6 0X10 5H SMD_BOT MDS62110225 M13718 GASKET_8 0X6 0X10...

Page 51: ... C5 PAD_ECKP VBY11 A6 PAD_ECKM VBY11 C6 PAD_E3P VBY12 B7 PAD_E3M VBY12 C7 PAD_E4P VBY13 C8 PAD_E4M VBY13 B9 PAD_F0P VBY14 C9 PAD_F0M VBY14 A10 PAD_F1P VBY15 C10 PAD_F1M VBY15 B11 PAD_MOD_GPIO8 VBY16 B12 PAD_MOD_GPIO9 VBY16 A12 PAD_F2P VBY17 A13 PAD_F2M VBY17 B13 PAD_FCKP VBY18 B14 PAD_FCKM VBY18 C14 PAD_F3P VBY19 A15 PAD_F3M VBY19 C15 PAD_F4P E9 PAD_F4M D9 PAD_G0P F8 PAD_G0M F9 PAD_E0P TEST F10 PA...

Page 52: ...2 CD A12 H25 PAD_IO 77 B A13 CD A13 D27 PAD_IO 82 B A14 CD A14 F27 PAD_IO 88 B A15 CD A15 J24 PAD_IO 85 B BA0 CD BA0 H24 PAD_IO 93 B BA1 CD BA1 H27 PAD_IO 81 B BA2 CD BA2 G24 PAD_IO 97 B RASZ CD RASZ K24 PAD_IO 94 B CASZ CD CASZ K23 PAD_IO 79 B WEZ CD WEZ H23 PAD_IO 95 B ODT CD ODT J23 PAD_IO 91 B CKE CD CKE J27 PAD_IO 76 B RST CD RST D28 PAD_IO 101 B MCLK CD MCLK K28 PAD_IO 100 B MCLKZ CD MCLKZ J...

Page 53: ...V_DB R13260 10K URSA_SYS_DEBUG URSA_OPT_5 URSA_OPT_0 SPI_DO R13235 10K URSA_BIT0_0 C13213 0 01uF 25V R13205 33 OPT R13240 10K URSA_BIT2_0 URSA_OPT_5 URSA_BIT2 L D_CLK R13220 10K URSA_OPT_4_1 SCL2_ 3 3V_DB URSA9_CONNECT R13203 33 OPT R13263 10K URSA_PQ_DEBUG C13210 1uF 10V OPT SW13201 JS2235S URSA_DEBUG 3 2 1 4 5 6 IC12800 LGE5352 URSA11 PAD_RESET AD26 PAD_XOUT AH4 PAD_XIN AH3 PAD_I2C_S_SDA AE9 PAD...

Page 54: ...07 39K 1 16W 5 Q13401 2N7002KA URSA11_VID_FET_KEC MAIN EBK62072501 G D S R13416 0 URSA11_VID C13406 2200pF 50V IC13402 TPS53513RVER 1 RF 3 EN 7 SW_2 9 SW_4 10 PGND_1 11 PGND_2 12 PGND_3 13 PGND_4 14 PGND_5 15 VIN_1 16 VIN_2 17 VIN_3 18 NC_2 19 VDD 20 VREG 21 MODE 22 GND 23 FB 24 VO 25 TRIP 26 NC_3 27 GND1 28 GND2 5 NC_1 8 SW_3 6 SW_1 4 VBST 2 PGOOD 29 EP R13420 10K OPT C13447 0 1uF 16V C13617 0 1u...

Page 55: ... C14896 0 47uF 6 3V VDDC C14876 1uF 10V 1 5V_U_DDR C14807 10uF 10V OPT L14804 BLM18PG121SN1D L14808 BLM18PG121SN1D URSA11 C14831 1uF 10V L14800 BLM18PG121SN1D C14822 10uF 10V C14808 0 1uF 16V C14803 10uF 10V AVDD_MOD L14805 BLM18PG121SN1D C14881 0 1uF 16V 1 5V_U_DDR AVDD_DVI_ALLRX C14837 0 1uF 16V C14842 0 1uF 16V C14844 0 1uF 16V C14839 0 1uF 16V C14890 0 1uF 16V C14820 10uF 10V C14851 0 1uF 16V ...

Page 56: ......

Page 57: ...ir Guide 15 years New Models Applicable Model xxUF64 xxUF643 xxUF645 xxUF679 xxUF68 xxUF83 series Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 58: ... Power On Off key IR 1 1 Main processor_ LM14A DDR Memory eMMC Memory 2 3 URSA 11 Micom for Key IR sensing 3 2 SIZE 174X285 4 Audio AMP 4 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 59: ... D Audio WiFi Power On Off key IR 1 1 Main processor_ LM14A DDR Memory eMMC Memory 2 3 URSA 11 Micom for Key IR sensing 3 2 SIZE 174X206 4 Audio AMP 4 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 60: ... Power On Off key IR 1 1 Main processor_ LM14A DDR Memory eMMC Memory 2 3 URSA 11 Micom for Key IR sensing 3 2 SIZE 174X206 4 Audio AMP 4 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 61: ...3 4 1 2 3 4 5 PCBs Main PCB PSU T CON IR Power On Off Key ASSY WiFi Combo ASSY To Main WiFi Combo ASSY IR Jog Key ASSY 6 6 xxUF64 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 62: ...2 5 3 1 2 3 4 5 PCBs Main PCB PSU T CON IR Jog Key ASSY WiFi ASSY To Main WiFi Combo ASSY IR Jog Key ASSY 6 6 xxUF643 xxUF645 xxUF679 xxUF68 4 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 63: ... 1 2 3 4 5 PCBs Main PCB PSU T CON IR Jog Key ASSY WiFi ASSY To Main WiFi Combo ASSY IR Jog Key ASSY 6 xxUF83 1 2 5 3 4 6 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 64: ...r auto on off 7 8 C Audio error No audio Normal video 8 9 Wrecked audio discontinuation noise 9 10 D Function error Remote control Local switch checking 10 MR15 operating checking 11 11 12 Wifi operating checking 12 13 Camera operating checking 13 14 External device recognition error 14 15 E Noise Circuit noise mechanical noise 15 16 F Exterior error Exterior defect 16 First of all Check whether t...

Page 65: ...s check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 16 LCD TV Error symptom A Video error No video Normal audio A18 A1 A18 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS Cable Speaker Cabl...

Page 66: ...AIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A18 Established date Revised date 2 16 LCD TV Error symptom 2 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 67: ...soldering Normal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Advanced Channels Channel Tuning Manual Tuning Check the Signal Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N A4 Standard Repair Process Established date Revised date ...

Page 68: ...ice and cable Y External device Cable normal HDMI error Check external device and cable Replace Main T con B D Replace Main T con B D N N A Video error Color error A6 N Y End Replace module Request repair for external device cable Color error Check Test pattern A8 A7 Standard Repair Process Established date Revised date 4 16 LCD TV Error symptom 4 2015 5 25 Copyright 2015 LG Electronics Inc All ri...

Page 69: ...ing Jig pattern Generator Set top Box etc N Y Replace Main T con B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main T con B D Screen n...

Page 70: ...t of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D N Y Normal Check 12V For STBY 3 3V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A18 A18 Standard Repair Process Established date Revised date 6 16 LCD TV Error symptom 6 Stand By Red or Turn On Operating Turn Off Close 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and se...

Page 71: ...by REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWEROF...

Page 72: ...pair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A20 A21 A18 Disconnection Established date Revised date 8 16 LCD TV Error symptom Standard Repair Process 8 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 73: ... and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 12V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Established...

Page 74: ...aterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D Normal Voltage Close N N Check 3 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A18 Check IR Output signal Normal Signal N Y Repair Replace IR B D N Replace Main B D Y Standard Repair Process Established date Revised date 10 16 LCD TV Error symptom 10 Y 2015 5 ...

Page 75: ... date 11 16 LCD TV Error symptom 11 Replace MR13 Turn off on the set and press the wheel Press the back key about 5sec Close If you conduct the loop at 3times change the M4 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 14 RF Remocon Test 3 Firmware download Y RF Receiver ver is 00 00 N Close A4 A4 2015 5 25 Copyright 2015 ...

Page 76: ...tion N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 12 16 LCD TV Error symptom 12 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A4 A4 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 77: ...Y N Reconnect the Camera module Standard Repair Process Established date Revised date 13 16 LCD TV Error symptom 13 Change the Camera module Normal operation Close Y N Replace Main B D A4 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 78: ...l device cable HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 14 16 LCD TV Error symptom Standard Repair Process 14 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 79: ...ution manual For models without any fix information provide the description OR Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual E Noise Circuit noise mechanical noise Established date Revised date 15 16 LCD TV Error symptom Stan...

Page 80: ...e controller Remote controller damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 16 16 LCD TV Error symptom Standard Repair Process 16 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 81: ...er Checking Part A5 7 A Video error _Vertical Horizontal bar residual image light spot LCD TV connection diagram A6 8 A Video error_ Color error Check Link Cable EPI reconnection condition A7 9 Adjustment Test pattern ADJ Key A8 10 Appendix Defected Type caused by T Con Inverter Module Exchange Main Board 1 A 1 5 11 Exchange Main Board 2 A 2 5 12 Exchange Power Board PSU A 3 5 13 Exchange Module 1...

Page 82: ...r error_Off when on off while viewing POWER OFF MODE checking method A19 19 C Audio error_ No audio Normal video Checking method in menu when there is no audio A20 20 Voltage and speaker checking method when there is no audio A21 25 E Etc Tool option changing method A22 Continued from previous page Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Int...

Page 83: ...naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from locations LCD TV A1 2015 5 25 xxUF64 xxUF643 xxUF645 xxUF68 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 84: ...ter recording the R G B GAIN Cut value of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD Entry method 1 Press the ADJ button on the remote controller for adjustment 2 Enter into White Balance of item 10 3 After recording the R G B GAIN Cut value of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD 2015 5 25 ALL MODELS Copyright 2015 LG Ele...

Page 85: ...epair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A3 Established date Revised date Error symptom Content LCD TV A3 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 86: ...Checking method for remote controller for adjustment Press the IN START with the remote controller for adjustment Version ALL MODELS A4 Established date Revised date Error symptom Content LCD TV A4 v 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 87: ... If you can t see the UHD live TV please connect signal at left side of jack Korea model only Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop ALL MODELS A5 Established date Revised date Error symptom Content LCD TV A5 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use O...

Page 88: ...bar residual image light spot As the part connecting to the external input check the screen condition by signal A6 Established date Revised date Error symptom Content LCD TV A6 ALL MODELS 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 89: ...o error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content LCD TV A7 ALL MODELS 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 90: ... using the ADJ Key Checking item 1 Defective pixel 2 Residual image 3 MODULE error ADD BAR SCAN BAR 4 Video error Classification of MODULE or Main B D A8 Established date Revised date Error symptom Content LCD TV A8 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 91: ...Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange Main Board 1 A 1 5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 92: ...r Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange Main Board 2 A 2 5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 93: ...ix Exchange Power Board PSU No Light Dim Light Dim Light Dim Light No picture Sound Ok A 3 5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 94: ...ss damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage A 4 5 Un repairable Cases In this case please exchange the module Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 95: ...k Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 A 5 5 Un repairable Cases In this case please exchange the module Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 96: ... B Power error _No power A17 Established date Revised date Error symptom Content LCD TV A17 2015 5 25 LM14A ST BY condition On or Off Power ON condition Turn Off Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 97: ...heck power input voltage and ST BY 3 5V B Power error _No power LCD TV A18 Check the DC 12V 2015 5 25 1 RL_ON 2 PWM_DIM2 3 GND 4 12V 5 12V 6 12V 7 12V 8 12V 9 GND 10 GND 11 INV_CTL 12 PWM_DIM1 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 98: ...andard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A19 Established date Revised date Error symptom Content LCD TV A19 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 99: ...V Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A20 Established date Revised date Error symptom Content LCD TV A20 2015 5 25 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 100: ... 3 Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video A21 Established date Revised date A21 1 SPK_R 2 SPK_R 3 SPK_L 4 SPK_L All Models Error symptom Content Cop...

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