LG 23LS7D-JA Schematic

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LJ71A

MODEL : 23LS7D 23LS7D-JA

website:http://biz.LGservice.com

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CONTENTS

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

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

SPECIFICATION ...................................................................................... 4

ADJUSTMENT INSTRUCTION ............................................................... 7

TROUBLE SHOOTING .......................................................................... 11

WIRING DIAGRAM ................................................................................ 17

BLOCK DIAGRAM ................................................................................. 18

EXPLODED VIEW .................................................................................. 20

REPLACEMENT PARTS LIST .............................................................. 22

SVC. SHEET ...............................................................................................

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SAFETY PRECAUTIONS

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. 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 1W), keep the resistor 10mm 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 1MΩ and 5.2MΩ. 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 1.5K/10watt resistor in parallel with a 0.15uF 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

0.5mA. 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

1.5 Kohm/10W

To Instrument’s exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

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1. Application range

This specification sheet is applied to the 20”/ 23” Wide LCD Digital TV used LJ71A chassis.

2. Requirement for Test

Each part is tested as below without special appointment.

(1) Power : Standard input voltage (100V, 50/60Hz) (2) Specification and performance of each parts are followed

each drawing and specification by part number in accordance with BOM

(3) The TV set 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 : JQA Specification EMC : JQA Specification

SPECIFICATION

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

4. General Specification(TV)

No Item Specification Remark

1 Video input applicable system NTSC-M/ ISDB-S

2 RF Input Channel 1) VHF : 1 ~ 12

2) UHF : 13 ~ 62

3) CATV : C13 ~ C38

4) Terr. digital : 000 ~ 999 (Logical CH Number)

5) BS digital : 000 ~ 999 (Logical CH Number)

6) CS digital : 000 ~ 999 (Logical CH Number)

3 Input Voltage 100V~, 50/60Hz

4 Market Japan

5 Tuning System FS

6 Operating Environment Temp : 0 ~ 40 deg

Humidity : 10~90 %RH

7 Storage Environment Temp : -20 ~ 50 deg

Humidity : 10~90 %RH

8 Display LCD Module

1 Viewing Angle R/L 80/80

<CR≥10> U/D 80/80

2 Luminance Luminance (cd/m2) 400 500

3 Contrast Ratio CR 550 700 All white / All black

4 CIE Color Coordinates WHITE Wx Typ. 0.280 Typ. In AV input

Wy -0.03 0.292 +0.03 PSM : Dynamic

RED Rx 0.638 White (100 IRE)

Ry 0.337

GREEN Gx 0.299

Gy 0.604

BLUE Bx 0.145

By 0.059

5. Module Specification

5.1. 23”LCD Module (AUO T230XW01 V3)

5.2. Optical characteristic specifications

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1 Display area 508.152 (H) x 285.696 (V) mm

2 Outline dimension 546.0 (H) x 318.3 (V) x 46.0 (D) mm Typ

3 Number of Pixels 1366 (H) x 768(V) 1Pixel=3RGB Cells

4 Cell pitch 372 μm (H) x 372 μm (V) μm 1Pixel=3RGB Cells

5 Color arrangement RGB vertical stripe

6 Weight(net) 3.3 Kg

7 Operating Environment Temperature 0 ~ 50 deg

Humidity 10 ~ 90 %

8 Storage Environment Temperature -20 ~ 60 deg

Humidity 10 ~ 90 %

9 Electrical Interface LVDS

10 Back light Unit 6 CCFL (6 lamps)

11 R/T 8ms Typ.

No. Item Min Typ. Max Unit Remark

No. Item

Specification

Min Typ. Max Remark

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7. Component Video Input (Y, PB, PR)

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

1 720*480 15.73 59.94 13.500 SDTV, DVD 480I

2 720*480 15.75 60.00 13.514 SDTV, DVD 480I

3 720*480 31.47 59.94 27.000 SDTV 480P

4 720*480 31.50 60.00 27.027 SDTV 480P

5 1280*720 44.96 59.94 74.176 HDTV 720P

6 1280*720 45.00 60.00 74.250 HDTV 720P

7 1920*1080 33.72 59.94 74.176 HDTV 1080I

8 1920*1080 33.75 60.00 74.250 HDTV 1080I

6. Model Specification

No. Item Specification Remark

1 Analog-terrestrial Broadcasting system NTSC-M

RF Input Channel VHF : 1~12

UHF : 13~62

CATV : C13~C38

2 Digital-terrestrial Broadcasting system ISDB-T

RF Input Channel 000~999 CH. Logical CH Number

3 Digital-BS/SC Broadcasting system ISDB-S

RF Input Channel 000~999 CH.

4 Video Input NTSC-3.58 NTSC4.43/PAL/PAL60/SECAM -> No Guarantee

5 S-Video Input NTSC-3.58 NTSC4.43/PAL/PAL60/SECAM -> No Guarantee

6 D-terminal Input Y/ Pb/Pr(D4: 480i/480P/720P/1080i) 576i/576p/720p(50Hz)/1080i(50Hz) -> No Guarantee

7 HDMI Input HDMI

8 Audio Input L/R Input 3EA : CVBS, S-video, D-terminal

9 Digital Optical Audio output AAC 5.1c Output Available for Digital TV only

PCM 2ch Output

10 Modem 2400bps(max)

11 Conditional Acess System B-CAS System

12 EPG

13 DATA Broadcasting

8. HDMI input (DTV)

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

1 720*480 15.73 59.94 13.500 SDTV 480I

2 1440*480 15.75 60.00 27.027 SDTV 480I

3 720*576 15.63 50.00 13.500 SDTV 576I

4 1440*576 15.63 50.00 27.000 SDTV 576I

5 720*480 31.47 59.94 27.000 SDTV 480P

6 720*480 31.50 60.00 27.027 SDTV 576P

7 720*576 31.25 50.00 27.000 SDTV 576P

8 1280*720 37.5 50.00 74.250 HDTV 720P

9 1280*720 44.96 59.94 74.176 HDTV 720P

10 1280*720 45.00 60.00 74.250 HDTV 720P

11 1920*1080 33.72 59.94 74.176 HDTV 1080I

12 1920*1080 33.75 60.00 74.250 HDTV 1080I

13 1920*1080 28.125 50.00 74.250 HDTV 1080I

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ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied to 20”/ 23” LCD TV which is manufactured in TV (or Monitor) Factory or is produced on the basis of this data.

2. Specification

1) The adjustment is according to the order which is designated and which must be followed, according to the plan which can be changed only on agreeing.

2) Power Adjustment: 100V, 50/60Hz

3) Magnetic Field Condition: Nil.

4) Input signal Unit: Product Specification Standard

5) Reserve after operation: Above 30 Minutes

6) Adjustment equipments: Color Analyzer(CA-210 or CA-

110), Pattern Generator (MSPG-925L or Equivalent), DDC Adjustment Jig equipment, SVC remote control

3. Main PCB check process

* APC - After Manual-Insert, executing APC

3.1. Download

1) Execute ISP program “Mstar ISP Utility”

2) Click “Config” and set as below

3) Click “Auto Detect” and check “OK” message. If “Error” is displayed, check connecting computer, jig, and set again.

4) Click “Connect”. If “Can’t” is displayed, check connecting computer, jig, and set.

5) Click “Read” tab, and then load download file(XXXX.bin) by clicking “Read”.

6) Click “Auto” tab and set as below.

7) click “Run”.

8) After downloading, check “OK” message.

3.2. ADC Process

(1) COMPONENT input ADC

1) Component Gain/Offset Adjustment

- Convert to Component in Input-source

- Signal equipment displays Impress Resolution 480P MODEL : 212 in Pattern Generator

(480p Mode, Y : 100%, Pb/Pr : 100%)

PATTERN : 08 in Pattern Generator

(MSPG-925 Series)

- Adjust by commanding AUTO_COLOR_ADJUST (0xF1) 0x00 0x02 instruction.

2) Confirmation

- We confirm whether “0x8E” address of EEPROM “0xB4” is “0xAA” or not.

- If “0x8E” address of EEPROM “0xB4” isn’t “0xAA”, we adjust once more.

- We can confirm the ADC values from “0x00~0x05” addresses in a page “0xB4”.

3.3. Function Check

(1) Check display and sound

- Check Input and Signal items. (cf. work instructions)

1) TV

2) AV1 : CVBS

3) AV2 : CVBS/ S-Video

4) COMPONENT : D-terminal(D4)

5) HDMI

* Display and Sound check is executed by Remote control.

filexxx.bin

(5)

(7) .......OK

(6)

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4. Total Assembly line process

4.1. Adjustment Preparation

- Above 30 minutes H/run in RF no signal

4.2. Confirm color coordinate of component

(1) Set Input to COMPONENT. (2) Input signal : 480P

Full white 216/255 gray level (85 IRE Model : 212, Pattern :

78 at MSPG925L) (3) Set PSM : Dynamic / CSM : Cool (4) Confirm whether x = 0.276+±0.03, y = 0.283±0.03 or not.

4.3. Confirm color coordinate of AV2

(1) Set Input to AV2 (2) Input signal : CVBS, NTSC-M

Full white 216/255 gray level (85 IRE, Model : 201, Pattern

: 78 at MSPG925L) (3) Set PSM : Dynamic / CSM : Cool (4) Confirm whether x = 0.276±0.03, y = 0.283±0.03 or not.

4.4. Other quality

- Confirm that each items satisfy under standard condition that

was written product spec.

- Confirm Video and Sound at each source

(1) Analog TV

- Select input Analog TV and check whether picture is displayed or not.

(2) Terrestrial Digital TV

- Select input Terrestrial Digital TV and check whether picture is displayed or not.

* Use ISDB-T Signal Generator(LG3802) and Stream

(Ch11, NHK1, Freq.473.143MHz) stored in the Generator.

Caution) It’s necessary to connect B-CAS CARD when you check this source.

(3) Satellite Digital TV (BS/CS)

Select input BS satellite Digital TV and check whether picture is displayed or not.

Caution) It’s necessary to connect B-CAS CARD when you check this source.

(4) AV1

- Select input AV1 (CVBS) and whether picture is displayed or not.

(5) AV2

- Select input AV2 (CVBS/S-video) and whether picture is displayed or not

(6) COMPONENT

- Select input COMPONENT and whether picture is displayed or not.

(7)HDMI

- Select input HDMI and whether picture is displayed or not

4.5. Power Consumption

1) Press “EYE” button on LG Adjust remocon and check whether LED color is amber or not.

2) Press “POWER” button on LG Ajust remocon to enter Stand-by mode.

3) Check the power consumption. (Under 1W)

4.6. HDCP setting

(High-Bandwidth Digital Contents Protection)

- Connect HDMI cable to HDMI jack.

- Input HDCP key with HDCP-key-in-program.

- HDCP key value is stored on EEPROM(AT24C64) which is

E00~F20 addresses of 0xBC~0xBE page.

- AC off/on and on HDCP button of MSPG925 and confirm

whether picture is displayed or not of using MSPG925.

- HDCP key value is different among the sets.

4.7 DDC EDID Write

1) Connect HDMI Signal Cable to HDMI Jack.

2) Write EDID DATA to EEPROM(24C02) by using DDC2B protocol.

3) Check whether written EDID data is correct or not. (refer to Product spec).

4.8. Modem Communication check

1) Connect a telephone wire between TV and Terminal adapter (MN128mini-SV1)

2) Press “EYE” button on LG Adjust Remocon and chek whether Power LED color is amber or not.

3) Press “MODE” button on LG Adjust Remocon and check whether the other LED color is red or not.

4) After “

test” is progressing automatically in DTV menu, check whether the message is displayed or not as below. (During “

test”, color of the other LED is green.) If the message is displayed, Modern communication test is OK.

4.9. Hi-POT

Confirm whether is normal or not when between power board’s as block and GND is impacked on 1500 Vac or 2121 Vdc/1sec for one second. (Judgment condition

: 1) Supply DC voltage -> set cut-off current to 10mA

2) Supply AC voltage -> set cut-off current to 100mA)

4.10. Insulation

After setting above condition, supply 500Vdc and then measure the insultion resistance(Spec : above 4M ohm)

4.11. Outgoing condition Configuration

- Analog/ Digital TV Initializing

1) Press “EYE” button on LG ADJUST REMOCON. (If Pressed “EYE” button on LG ADJUST REMOCON, Color of Power LED will be Amber)

2) Press “IN-STOP” button on LG ADJUST REMOCON. It is executed 3~15 procedure automatically by Software program.(If pressed “IN-STOP” button, Color of “

” LED will be RED)

3) After Initializing is finished, the TV set turns off automatically.

4.10. Option data setting(SVC OSD setting)

* Tool/Area option confirm.

If Tool option(17280)/Area option(0) is not, change the Tool option(17280)/Area(0) value compulsorily.

5. Adjustment Command

5.1. Adjustment Commands(LENGTH=84)

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TOOL OPTION 17280

AREA OPTION 0

OPTION 1 6

OPTION 2 2

OPTION 3 2

OPTION 4 0

OPTION 5 9

FACTORY ON E0 00 00 Factory mode on

FACTORY OFF E2 00 00 Factory mode off

EEPROM ALL INIT. E4 00 00 EEPROM All clear

EEPROM Read E7 00 00 EEPROM Read

EEPROM Write E8 00 data EEPROM Write by some values

COLOR SAVE (R/G/B cutoff, Drive, Contrast, Bright) EB 00 00 Color Save

H POSITION 20 00 00 – 100 They have different range each mode, FOS Adjustment.

V POSITION 30 00 00 – 100

CLOCK 90 00 00 – 100

PHASE 92 00 00 – 100

R DRIVE 16 00 00 – FF Drive adjustment

G DRIVE 18 00 00 – FF

B DRIVE 1A 00 00 – FF

R CUTOFF 80 00 00 – 7F Offset adjustment

G CUTOFF 82 00 00 – 7F

B CUTOFF 84 00 00 – 7F

BRIGHT 10 00 00 – 3F Bright adjustment

CONTRAST 12 00 00 - 64 Luminance adjustment

AUTO_COLOR_ADJUST F1 00 02 Auto COLOR Adjustment

CHANGE_COLOR_TEMP F2 00 0,1,2,3 0 : COOL, 1 : NORMAL, 2 : WARM, 3 : USER

FACTORY_DEFAULT F3 00 00 Factory mode off & II_SW is “1” & Input change to “ TV”

AUTO_INPUT CHANGE F4 00 0,1,2,4 0:ATV, 1:Video1, 2:Video2, 3:DTV, 4:D-TERMNAL, 5:HDMI

VAL DescriptionADRCMD(hex)Adjustment Contents

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5.2 EEPROM DATA READ

(1) Signal Table

(2) Command Set

* Purpose : To read the appointment Address of E2PROM by

128(80h)-byte

5.3. E2PROM Data Write

(1) Signal Table

LEN : 84h+Bytes CMD : 8Eh ADH : E

PROM Slave Address(A0,A2,A4,A6,A8), Not

00h(Reserved by BufferToEEPROM)

ADL : E

PROM Sub Address(00~FF)

Data : Write data

(2) Command Set

* Purpose

1) EDID write : 16-byte by 16-byte, 8 order (128-byte) write(TO “00 – 7F” of “EEPROM Page A4”).

2) FOS Default write : 16-mode data (HFh, HFl, VF, STD, HP, VP, Clk, ClkPh, PhFine) write.

3) Random Data write : write the appointment Address of E

PROM.

5.4. VRAM Read

1) Send CMD(70h) to read Video RAM value from MICOM And save its value to 128-Bytes Buffer.(Common Buffer for the use of EDID)

2) Delay 500ms. (Time to Wait and Read Video RAM from MICOM)

3) Be transmitted the contents of MICOM’s 128-bytes Buffer to PC. (128th Data is the CheckSum of 127-bytes data : That’s OK if the value of adding 128-bytes Data is Zero)

128 Bytes

Delay 100ms

Data 128

EEPROM READ E7 A0 0 0-Page 0~7F Read

80 0-Page 80~FF Read

A2 0 1-Page 0~7F Read

80 1-Page 80~FF Read

A4 0 2-Page 0~7F Read

80 2-Page 80~FF Read

A6 0 3-Page 0~7F Read

80 3-Page 80~FF Read

Adjustment contents CMD(hex) ADH(hex) ADL(hex) Details

EEPROM WRITE E8 94 16-Byte Write

84+n n-byte Write

Adjustment contents CMD(hex) ADH(hex) Details

TROUBLE SHOOTING

1. No Power (LED indicator off) : [A] Process

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Check 12V or

ST_5V of Power B/D.

Fail

Pass

Check short of Main B/D or Change Power B/D.

Check Output of IC1000, IC1004.

Fail

Check short of

IC100, Q308.

Pass

Fail

Re-soldering or Change defect part of IC100, Q308.

Change IC1000, IC1004.

Pass

Change IC1006, IC1005.

Check Output of IC1006, IC1005.

Fail

Check short of

Q308, TU600, IC500.

Fail

Re-soldering or Change defect part of Q308, TU600, IC500.

Pass

Change IC1002, IC1003.

Change LED Assy.

Check Output of IC1002, IC1003.

Pass

Check LED Assy.

Pass

Check P306 Connector.

Fail

Check short of

IC100, IC400.

Fail

Re-soldering or Change defect part of IC100, IC400.

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2. No RASTER : [B] Process

Check LED status

On Display Unit.

Fail

Pass

Repeat A PROCESS.

Check Panel Link

Cable or Module.

Pass

Fail

Change Panel Link Cable or Module.

Check Inverter

Connector or

inverter.

Fail

Change Inverter Connector or Inverter.

Pass

Change IC100

Check Output of

Q308.

Pass

Check the LVDS

Output of IC100

Pass

Check Input source Cable and Jack.

Fail

Change Module.

Fail

Change Q308.

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3. No RASTER on DTV Signal

Repeat [A,B] process

Pass

Check the input/

output of R918.

Fail

Check the P901.

Pass

Re-soldering or change the defect part. Check the X100

Check the input/

output of R127.

Pass

Check the input/

output of IC100

Pass

Check and Change the Digital board.

Fail

Re-soldering or Change the defect part.

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4. No Raster on Component Signal

Repeat [A, B]

process.

Pass

Check the input/

output of R806.

Fail

Check the J801.

Pass

Re-soldering or change the defect part, Check the X100.

Check

the input/output

of R121.

Pass

Check the

input/output of IC100.

Pass

Check input source cable and jack.

Fail

Re-soldering or Change the defect part.

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