LG 75SK8070PUA Schematic

CONFIDENTIAL

LED TV

SERVICE MANUAL

CHASSIS : UA82F

MODEL : 75SK8070PUA

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL70424720 (1804-REV00)

Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

CONTENTS

CONTENTS .............................................................................................. 2

SAFETY PRECAUTIONS ........................................................................ 3

SERVICING PRECAUTIONS ................................................................... 4

SPECIFICATION ....................................................................................... 6

SOFTWARE UPDATE ............................................................................. 9

BLOCK DIAGRAM ................................................................................. 10

EXPLODED VIEW .................................................................................. 18

DISASSEMBLY ....................................................................................... 19

TROUBLE SHOOTING GUIDE ................................................ APPENDIX

- 2 -

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the 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.

General Guidance

An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.

It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1 W), keep the resistor 10 mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, 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 metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1 MΩ and 5.2 MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.

Do not use a line Isolation Transformer during this check. Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to

0.5 mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

- 3 -

SERVICING PRECAUTIONS

CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the

SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conict between the

following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First.

General Servicing Precautions

1. Always unplug the receiver AC power cord from the AC power source before;

a. Removing or reinstalling any component, circuit board mod-

ule or any other receiver assembly.

b. Disconnecting or reconnecting any receiver electrical plug or

other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic

capacitor in the receiver. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc".

3. Do not spray chemicals on or near this receiver or any of its assemblies.

4. Unless specied otherwise in this service manual, clean

electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-abrasive applicator; 10 % (by volume) Acetone and 90 % (by volume) isopropyl alcohol (90 % - 99 % strength)

CAUTION: This is a ammable mixture. Unless specied otherwise in this service manual, lubrication of

contacts in not required.

5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this service manual might be equipped.

6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

7. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last.

8. Use with this receiver only the test xtures specied in this

service manual.

CAUTION: Do not connect the test xture ground strap to any

heat sink in this receiver.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES

devices are integrated circuits and some eld-effect transistors

and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential 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 electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static type solder removal device. Some solder

removal devices not classied as “anti-static” can generate electrical charges sufcient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate

electrical charges sufcient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your

foot from a carpeted oor can generate static electricity sufcient to damage an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500 °F to 600 °F.

2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.

3. Keep the soldering iron tip clean and well tinned.

4. Thoroughly clean the surfaces to be soldered. Use a mall wirebristle (0.5 inch, or 1.25 cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners.

5. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature.

(500 °F to 600 °F) b. Heat the component lead until the solder melts. c. Quickly draw the melted solder with an anti-static, suction-

type solder removal device or with solder braid.

CAUTION: Work quickly to avoid overheating the circuit board printed foil.

6. Use the following soldering technique. a. Allow the soldering iron tip to reach a normal temperature

(500 °F to 600 °F)

b. First, hold the soldering iron tip and solder the strand against

the component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the

component lead and the printed circuit foil, and hold it there only until the solder ows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil.

d. Closely inspect the solder area and remove any excess or

splashed solder with a small wire-bristle brush.

- 4 -

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent at against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above.

Removal

1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC.

Replacement

1. Carefully insert the replacement IC in the circuit board.

2. Carefully bend each IC lead against the circuit foil pad and solder it.

3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas).

"Small-Signal" Discrete Transistor Removal/Replacement

1. Remove the defective transistor by clipping its leads as close as possible to the component body.

2. Bend into a "U" shape the end of each of three leads remaining on the circuit board.

3. Bend into a "U" shape the replacement transistor leads.

4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection.

Power Output, Transistor Device Removal/Replacement

1. Heat and remove all solder from around the transistor leads.

2. Remove the heat sink mounting screw (if so equipped).

3. Carefully remove the transistor from the heat sink of the circuit board.

4. Insert new transistor in the circuit board.

5. Solder each transistor lead, and clip off excess lead.

6. Replace heat sink.

Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as possible to diode body.

2. Bend the two remaining leads perpendicular y to the circuit board.

3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board.

4. Securely crimp each connection and solder it.

5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder.

3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).

1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary).

2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern.

3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection.

4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire.

At Other Connections

Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board.

1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens.

2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern.

3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.

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.

- 5 -

SPECIFICATION

NOTE : Specifications and others are subject to change without notice for improvement

.

1. Application range

This specification is applied to the LED TV used UA82F chassis.

2. Test condition

Each part is tested as below without special appointment. (1) Temperature: 25 °C ± 5 °C, CST: 40 °C ± 2 °C (2) Relative Humidity: 65 % ± 10 % (3) Power Voltage

: Standard input voltage (AC 100-240 V~, 50/60 Hz) * Standard Voltage of each products is marked by models.

(4) Specification and performance of each parts are followed

each drawing and specification by part number in accordance with BOM.

(5) The receiver must be operated for about 5 minutes prior to

the adjustment.

3. Test method

(1) Performance: LGE TV test method followed (2) Demanded other specification

- Safety : CE, IEC specification

- EMC : CE, IEC

4. General Specification

No Item Specication Remark

1 Market North America

2 Broadcasting system ATSC / NTSC-M, 64 & 256 QAM

3 Available Channel VHF : 02~13

UHF : 14~69

DTV : 02-69

CATV : 01~135

CADTV : 01~135

4 Receiving system Digital : ATSC, 64 & 256 QAM

Analog : NTSC-M

5 Video Input NTSC-M Rear (1EA)

6 Component Input Y/Cb/Cr, Y/ Pb/Pr Rear (1EA)

7 HDMI Input HDMI 1 PC / DTV format Side, Support 6Gbps

HDMI 2 PC / DTV format Side, Support 6Gbps, Support ARC

HDMI 3 PC / DTV format Rear, Support 6Gbps

HDMI 4 PC / DTV format Rear, Support 6Gbps

8 Audio Input Component / AV Audio / DVI Audio L/R Input ; Rear

Component and AV and DVI use same jack ;

9 SPDIF out(1EA) Optical Audio out Rear (1EA),

10 USB Input(3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD

Side(1EA), Rear(1EA)

- 6 -

5. External Input Support Format

5.1. Component (Y, PB, PR)

No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

1 720*480i 15.73 59.94 13.50 SDTV, DVD 480I(525I)

2 720*480i 15.75 60.00 13.51 SDTV, DVD 480I(525I)

3 720*480p 31.47 59.94 27.00 SDTV 480P

4 720*480p 31.50 60.00 27.02 SDTV 480P

5 1280*720p 44.96 59.94 74.17 HDTV 720P

6 1280*720p 45.00 60.00 74.25 HDTV 720P

7 1920*1080i 33.72 59.94 74.17 HDTV 1080I

8 1920*1080i 33.75 60.00 74.25 HDTV 1080I

9 1920*1080p 67.43 59.94 148.5 HDTV 1080P

10 1920*1080p 67.50 60.00 148.5 HDTV 1080P

5.2. HDMI Input (PC/DTV)

No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

HDMI-PC

1 640*350 31.46 70.09 25.17 EGA

2 720*400 31.46 70.08 28.32 DOS

3 640*480 31.46 59.94 25.17 VESA(VGA)

4 800*600 37.87 60.31 40 VESA(SVGA)

5 1024*768 48.36 60.00 65 VESA(XGA)

6 1360*768 47.71 60.01 84.75 VESA(WXGA)

7 1152*864 54.34 60.05 80 VESA

8 1280*1024 63.98 60.02 109.00 SXGA Support to HDMI-PC

9 1920*1080 67.5 60 158.40 WUXGA

(Reduced Blanking)

10 1920*1080 135 120 297 UDTV 1080P

11 3840*2160 54 24.00 297.00 UDTV 2160P

12 3840*2160 56.25 25.00 297.00 UDTV 2160P

13 3840*2160 67.5 30.00 297.00 UDTV 2160P

14 4096*2160 53.95 23.97 296.70 UDTV 2160P

15 4096*2160 54 24 297 UDTV 2160P

- 7 -

No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

DTV

1 640*480 31.46 59.94 25.12 SDTV 480P

2 640*480 31.5 60.00 25.12 SDTV 480P

3 720*480 15.73 59.94 13.50 SDTV, DVD

480I(525I)

4 720*480 15.75 60.00 13.51 SDTV, DVD

480I(525I)

5 720*576 15.62 50.00 13.50 SDTV, DVD

576I(625I) 50Hz

6 720*480 31.47 59.94 27 SDTV 480P

7 720*480 31.5 60.00 27.02 SDTV 480P

8 720*576 31.25 50.00 27 SDTV 576P

9 1280*720 44.96 59.94 74.17 HDTV 720P

10 1280*720 45 60.00 74.25 HDTV 720P

11 1280*720 37.5 50.00 74.25 HDTV 720P

12 1920*1080i 28.12 50.00 74.25 HDTV 1080I

13 1920*1080i 33.72 59.94 74.17 HDTV 1080I

14 1920*1080i 33.75 60.00 74.25 HDTV 1080I

15 1920*1080p 26.97 23.97 63.29 HDTV 1080P

16 1920*1080p 27.00 24.00 63.36 HDTV 1080P

17 1920*1080p 33.71 29.97 79.120 HDTV 1080P

18 1920*1080p 33.75 30.00 79.20 HDTV 1080P

19 1920*1080p 56.25 50.00 148.5 HDTV 1080P

20 1920*1080p 67.43 59.94 148.35 HDTV 1080P

21 1920*1080p 67.5 60.00 148.50 HDTV 1080P

22 1920*1080p 112.5 100 297.00 UDTV 1080P

23 1920*1080p 134.86 119.88 296.70 UDTV 1080P

24 1920*1080p 135.00 120 297 UDTV 1080P

25 3840*2160p 53.95 23.98 296.70 UDTV 2160P

26 3840*2160p 54 24.00 297.00 UDTV 2160P

27 3840*2160p 56.25 25.00 297.00 UDTV 2160P

28 3840*2160p 61.43 29.97 296.70 UDTV 2160P

29 3840*2160p 67.5 30.00 297.00 UDTV 2160P

30 3840*2160p 112.5 50.00 594 UDTV 2160P

31 3840*2160p 134.86 59.94 593.40 UDTV 2160P

32 3840*2160p 135 60.00 594 UDTV 2160P

33 4096*2160p 53.95 23.98 296.70 UDTV 2160P

34 4096*2160p 54 24.00 297 UDTV 2160P

35 4096*2160 56.25 25.00 297 UDTV 2160P

36 4096*2160 61.43 29.97 296.70 UDTV 2160P

37 4096*2160 67.5 30.00 297 UDTV 2160P

38 4096*2160 112.5 50.00 594 UDTV 2160P

39 4096*2160 134.86 59.94 593.40 UDTV 2160P

40 4096*2160 135 60.00 594 UDTV 2160P

Spec. out but display

- 8 -

SOFTWARE UPDATE

1. USB

(1) Insert the USB memory Stick to the USB port (2) Automatically detect the SW Version and show the below

message

(3) Click [YES]: initiate the download and install of the update.

2. NSU

(This Function is needed to connect to the internet)

(1) Menu -> All Settings -> General -> About This TV

(2) Click [CHEK FOR UPDATES] : system check newest

version

(4) Click [Check Now]: move to “About This TV” page for

update

(5) TV is updating

(6) After finished the update, below Pop-up appear

(7) Click [Yes] : TV will be DC OFF -> ON (8) After TV turned on, Check the updated SW Version and

Tool Option

(3) Click [DOWNLOAD AND INSTALL] (4) TV is updating

(5) After finished the update, below Pop-up appear

(6) Turn OFF the TV and On. Check the updated SW Version

and Tool Option

- 9 -

1. Main IC

DDR4 2133

512MB

DDR4 2666

512MB

MAIN Audio AMP

Main

I

C

I2C

OPTIC

LAN

HDMI1 HDMI 2.0

EEPROM(NVRA

M)

(256Kb)

PHY3_RX0N

USB1 (2.0)

eMMC

(4GB)

Sub Micom

(RENESAS

R5F100GEAFB)

X_TAL

24MHz

X_TAL

32.768KH

z

I2C 4

R E A

R

SPDIF OUT

ETHERNET

I2C 1

SUB

ASSY

IR / KEY

ST-BY LED

WIFI/BT Combo

USB_WIFI

CVBS / SIF

HDMI3 HDMI 2.0

USB2 (2.0)

HDMI2(ARC) HDMI 2.0

Vx1 Interface

USB3_0

USB2_2

PHY2_RX0N

PHY1_RX0N

HDMI4 HDMI 2.0

PHY0_RX0N

USB3 (2.0)

USB2_1

Side

Rear

TU6701

X

101

I2C 0

I2C 5

Side

Rear

IC400

IC102

I

C8800

I2S

I

C5300

IC3000

X

3001

JK4200

J

K4400 JK4600

J

K3101

JK3102

JK3103

J

K3104

TS

Rear

HP

AV

Rear

AV

Audio Out

DDR4 2666

512MB

IC401

I

C500

DDR4 2133

512MB

IC501

BLOCK DIAGRAM

- 10 -

2. I2C

SCL0

SDA0

100Ω

3.3KΩ

Main IC

+3.3V_NORMAL

3.3KΩ

33Ω

IC102

NVRAM

+3.3V_NORMAL

IC5300

NTP7518

TUNER

SCL4

SDA4

33pF

SCL5

SDA5

1.8KΩ

SCL1

SDA1

IC3000

MICOM

33Ω

3.3KΩ

+3.3V_NORMAL

33Ω

47pF

+3.3V_TU

SCL3

SDA3

- 11 -

3. Power

IC2000 / 12A

IC1800 / 3A

+

D13V

+5V_NORMAL

A

IC1600 / 6A

IC1400 / 3A

IC1100

1

3V

IC1700 / 4A

NTP7518

DDR3

+

3.3V_NORMAL

+3. 5V_ST

+1.8V_IO

IC2100 / 3A

+0. 9V_CPU

+0.9V_CORE

+A13V

USB1 (2.0)

USB2 (2.0)

PANEL

IC1500 / 3. 5A

1.5V_DDR

MICOM

IR_KEY

ETHERNET

WIFI

+3.5V_WO

L

WIFI_EN

Main IC

Main

IC6900 / 2A

+0. 9V_DDR &C4TX

NVRAM

H/P AMP

1.1V_DEMOD

TUNER

NTP7518

MAX3232CDR

IC2300 / 2A

+0.9V DDR

Main SOC

USB1 (2.0)

IC1501 / 3. 5A

IC1502 / 1A

DDR4

1

.2V_DDR

2

.5V_VPP

Main IC

- 12 -

4. Tuner

SCL5

SDA5

AAD_ADC_SIF

Tuner

[I2C_SCL_5_TU] 1

[I2C_SDA_5_TU] 2

[TU_CVBS_TU] 4

[IF_AGC_TU] 5

[TU_SIF_TU] 6

[IF[N]] 7

[IF[P]] 8

TU_CVBS

IF_AGC

CVBS_IN1

IFAGC

+3.3V_TU

1.2KΩ

Main IC

[3.3V_TU] 3

+3.3V_TU

33 Ω

TU_SIF

DMD_TADC_INN

IF_N_TU

DMD_TADC_INP

IF_P_TU

- 13 -

5. Video/Audio

Main IC

CVBS_IN2

Tuner

Jack Side

SoC Side

J

K3401

AV_CVBS_IN / AV_L / AV_R

AV1_CVBS_IN_SOC

TU_CVBS_TU

T

U_SIF_TU, IF_P/ N_TU

C

VBS_IN1

A

AD_ADC_SIF, DMD_ADC_INP, DMD_ADC_INN

TU_CVBS

TU_SIF, IF_P/ N

FE_DEMOD1/2_TS_CLK,SYNC,VAL

F

E_DEMOD1/2_TS_CLK,SYNC,VAL

[ TP0CLK ,VLD,SYNC]

Y1_IN

COMP2_Y_IN_SOC

JK3402

- 14 -

SPDIF_OUT

IC5300

F

ront AMP

N

TP7518

LPF

IEC958OUT

Tune

r

TR BUF

A

AD_ADC_SIF

HP_LOUT / HP_ROUT

H

EAD PHONE

LPF

AUDA_OUTL_CH1

A

UDA_OUTR_CH1

TUNER_SIF

IC3000

M

ICOM

AMP_MUTE

GPIO23

AMP_RESET_N

JK3403

JK6200

LPF

Front_L

F

ront_R

DACSCK/ GPIO81

Main IC

SDA0/GPIO138

S

CL0/ GPIO139

AUD_LRCK

A

UD_LRCH

IC6300

EAN62668301

I2C_SDA_0_AMP1 / I2C_SCL_0_AMP1

DACLRCH/ GPIO82

D

ACLRCK

AUD_SCK

S

I

DE

_H

P

_MUTE

AUAD_R_CH1_IN

A

UAD_L_CH2_IN

JK340

1

6. Audio Out

- 15 -

HDMI4 (SIDE)

H

DMI 2.0

HDMI2 (SIDE) with ARC

H

DMI 2.0

CE

C_

R

E

M

O

TE

RENESAS

M

ICOM(IC3000)

M

ain IC

HDMI_ARC

X- Tal(X3000)

3

2.768kHz

HDMI1 (SIDE)

H

DMI2.0

DDC_SCL_1

D

DC_SDA_1

T

MDS Link 8b its

DDC_SCL_2

D

DC_SDA_2

TMDS Link 8bits

DDC_SCL_4

D

DC_SDA_4

* TMDS Link 8bits = TMDS DATA 6bits(DATA0,1,2)+ TMDS CLK 2bits

TMDS Link 8bits

HDMI_CEC_MICO

M

Q3001

DDC_SCL_1

DDC_SDA_1

J

K3104

J

K3102

J

K3101

HDMI3 (SIDE)

HDMI2.0

JK3103

DDC_SCL_3

D

DC_SDA_3

T

MDS Link 8b its

DDC_SCL_2

DDC_SDA_2

PHY0_ARC_OUT

DDC_SCL_3

DDC_SDA_3

DDC_SCL_4

DDC_SDA_4

7. HDMI

- 16 -

USB1(SIDE)

USB3.0_1_DM0

USB3.0_1_DP0

USB2(SIDE)

IC1600

5V / 6A

+5V_USB_1

+5V_USB_2

/USB_OCD2

USB_CT

L2

USB_CTL2

/USB_OCD2

WIFI_DM

WIFI_DP

USB2_2_DM0

USB2_2_DP0

RENESAS MICOM(IC3000)

UART0_TXD/GPIO105

UART0_RXD/GPIO106

SOC_TX

SOC_RX

IC7200

MAX3232CDR

USB2.0

WIFI Combo

BT_RESET

BT_WAKEUP_DEVICE

BT_WAKEUP_HOST

OCP

IC4301

OCP

IC4501

+5V_NORMAL

JK4400

JK4200

USB2.0

M

ain IC

USB2.0_2_DM1

USB2.0_2_DP1

OCP

IC4700

+5V_NORMAL

USB3(Rear)

+5V_USB_3

USB_CTL2

/USB_OCD2

JK4600

USB2.0_3_DM0

USB2.0_3_DP0

USB2.0

8. USB / WIFI / M-REMOTE / UART

- 17 -

400

540

521

120

411

LV1

121

500

570

820

200A

530

LV2

900

910

710

810

200T

200

HP1

HS1

700

AR2

A10

A9

HW1

EXPLODED VIEW (SET)

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the 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.

- 18 -

ASSEMBLY / DISASSEMBLY GUIDE (SET)

:M4*20 4EA Disassemble screw

[Disassembly Guide]

(1) Lay the TV Set on a flat Pad and Remove the Stand Screw 4ea. -> Remove the Stand

: M4*20 4EA Disassemble screw

(2) Remove 1ea Screw of the Power Cord Bracket. -> Remove the Power Cord Bracket

:M3*5.5 1EA Disassemble screw Separate the Power Cord Bracket Remove the Power Cord Bracket Assy

- 19 -

(3) Remove the B/C Screw 18ea. -> Remove the B/C

(4)

(5)

(6)

(But, Don’t remove 2ea Screw of EGI Bar -> See below photo)

(4) M3*5.5 4ea Disassemble screw (5) Detach the tape 3ea (6) Separate connector 1ea -> Remove the Bottom Cover Bracket

: Don’t Remove 2ea Screw

:M3*5.5 9EA Disassemble screw

:M4*10 5EA Disassemble screw

:M8*10 4EA Disassemble screw

- 20 -

(7) Separate connector 13ea

(8) (8)

(8)

(7)

(7) (7)

(7)

(7) (7)

(7)

b

a a

b

a

(8) M3*5.5 8ea Disassemble screw -> Remove the Main and Power PCB Assy

(9) Remove the Speaker 2ea

- 21 -

(10) M4*8 4EA Disassemble screw -> Remove the 1Pole Stand Guide Supporter (11) Detach the Insulation Sheet 1ea

- 22 -

[Assembly Guide]

(2)

(2) (2)

(2)

(1)

b

a

b

a

b

(3)

a

b

(1) Attach the Insulation Sheet 1ea (2) Place the 1Pole Stand Guide Supporter and M4*8 4EA Assemble screw

(3) Assemble the Speaker 2ea. ( )

- 23 -

(4) M3*5.5 8ea Assemble screw

(4) (4)

(4)

(5)

(5) (5)

(5)

(5) (5)

(5)

(7)

(8)

(6)

(5) Attach Connector 13ea

(6) Attach Connector 1ea (7) M3*5.5 4ea Assemble screw (8) Attach the tape 3ea

- 24 -

(9) Place the B/C on the module and Assemble the B/C Screw 18ea.

:M4*20 4EA Disassemble screw

(10) Attach the Power Cord Bracket and Assemble the screw 1ea.

:M3*5.5 9EA Disassemble screw

:M4*10 5EA Disassemble screw

:M8*10 4EA Disassemble screw

:M3*5.5 1EA Disassemble screw Separate the Power Cord Bracket Remove the Power Cord Bracket Assy

- 25 -

(11) Assemble the Stand Assy. (Assemble screw 4ea)

: M4*20 4EA Disassemble screw

- 26 -

[ Module Disassemble ]

(1) Disassemble of Cover Shield

DISASSEMBLY GUIDE (MOUBLE)

Disassemble the Screws

Disassemble the source PCB from the guide

(2) Disassemble of Clip

Top Clip Disassembly

Down Clip Disassembly

- 27 -

[CaseTop Disassemble]

Holder C/Top

Screw

Ga p mainta in(below 20mm)

Gap 유지(20mm 이하)

Gap maintain(below 20mm)

(1) LCM reversal

(2) Disassemble and dismantle rear holder

(3) CaseTop Left / Right Breakdown

Dismantle the back hook and disassemble the left / right side.

- CaseTop opens left / right. (Minimizing widening)

(4) Case Top Up disassemble

Disassemble the top of the back hook.

- Grab the corner when proceeding to disassemble the upper part

- 28 -

(5) LCM reversal

- When reversing, hold the panel so that it does not fall off.

(6) C/Top Down

- CaseTop Down after removing Screw Separate from LCM

- 29 -

[BLU Disassemble]

LED

(1) Panel and Guide Panel disassembly (using adsorber)

(2) Remove Guide Panel by unhooking Guide Panel Hook

(3) Removal of Sheets

(4) Removal of LGP

- 30 -

LG 75SK8070PUA Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual