LG 37LV370S Bedienungsanleitung

LED LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LD12B

MODEL : 37LV370S 37LV370S-ZB

MODEL : 37LV375G/S/W 37LV375G/S/W-ZC

North/Latin America http://aic.lgservice.com

Europe/Africa http://eic.lgservice.com

Asia/Oceania http://biz.lgservice.com

Internal Use Only

Printed in KoreaP/NO : MFL67002312 (1103-REV00)

Only for training and service purposes

CONTENTS

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

PRODUCT SAFETY ................................................................................. 3

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

ADJUSTMENT INSTRUCTION ................................................................ 8

BLOCK DIAGRAM.................................................................................. 14

EXPLODED VIEW .................................................................................. 15

SCHEMATIC CIRCUIT DIAGRAM ..............................................................

Only for training and service purposes

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 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

1.5 Kohm/10W

To Instrument's

exposed

METALLIC PARTS

Good Earth Ground

such as WATER PIPE,

CONDUIT etc.

AC Volt-meter

When 25A is impressed between Earth and 2nd Ground

for 1 second, Resistance must be less than 0.1

*Base on Adjustment standard

IMPORTANT SAFETY NOTICE

0.15 uF

Ω

Only for training and service purposes

SPECIFICATION

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

1. Application range

This specification is applied to the LCD TV used LD12B chassis.

2. Requirement for Test

Each part is tested as below without special appointment.

1) Temperature: 25 ºC ± 5 ºC(77 ºF ± 9 ºF), CST: 40 ºC ± 5 ºC

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

Only for training and service purposes

4. Model General Specification

No. Item Specification Remarks

1 Market EU(PAL Market-36Countries) DTV & Analog (Total 36 countries)

DTV (MPEG2/4, DVB-T) : 31 countries

(England/Italy/Germany/France/Spain/Sweden/Finland/Netherlands/Belgium/Luxemburg/

Greece/Denmark/Czech/Austria /Hungary/Swiss/Croatia/Turkey/Norway/Slovenia/Poland/

Ukraine/Portugal/Ireland/Moroco/Latvia/Estonia/Lithania/Rumania/Russia/Slovakia)

DTV (MPEG2/4, DVB-T2): 5 countries

(England/Sweden/Finland/Denmark/Norway)

DTV (MPEG2/4, DVB-C): 10 countries

(Sweden/Finland/Denmark/Norway/Austria/Swiss/Germany/Netherlands/Hungary/Slovenia)

Analog Only - 5 countries

(Bosnia/Serbia/Bulgaria/Albania/Kazakhstan)

2 Broadcasting system 1) PAL-BG - DVB-T2/S is supported in specific models.

2) PAL-DK 1. DVB-T2 : Model name : xxxxxxxT

3) PAL-I/I’ 2. DVB-S : Model name : xxxxxxxS

4) SECAM L/L’ - SECAM L/L’ is not supported in DVB-T2 models.

5) DVB-T/C

6) DVB-T2

7) DVB-S

3 Receiving system Analog : Upper Heterodyne GDVB-T

Digital : COFDM , QAM - Guard Interval(Bitrate_Mbit/s)

1/4, 1/8, 1/16, 1/32

- Modulation : Code Rate

QPSK : 1/2, 2/3, 3/4, 5/6, 7/8

16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8

64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8

GDVB-C

- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s

- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM

GDVB-T2

- Guard Interval(Bitrate_Mbit/s)

1/4,1/8,1/16,1/32,1/128,19/128,19/256,

- Modulation : Code Rate

QPSK : 1/2, 2/5, 2/3, 3/4, 5/6

16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6

64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6

256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6

GDVB-S

GDVB-S2

4 Scart Jack (1EA) PAL, SECAM Scart Jack is Full scart and support RF-OUT(analog & DTV)

SECAM is not supported in DVB-T2 models.

5 Video Input RCA(1EA) PAL, SECAM, NTSC 4System : PAL, SECAM, NTSC, PAL60

SECAM is not supported in DVB-T2 models.

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

7 RGB Input RGB-PC Analog(D-SUB 15PIN)

8 HDMI Input (3EA) HDMI1-DTV (DVI) PC(HDMI version 1.3)

HDMI2-DTV Support HDCP

HDMI3-DTV

9 Audio Input (3EA) RGB/DVI Audio, Component, AV L/R Input

10 SDPIF out (1EA) SPDIF out

11 Earphone out (1EA) Antenna, AV1, AV2, AV3, Component,

RGB, HDMI1, HDMI2, HDMI3, USB

12 USB (1EA) EMF JPEG, MP3

For SVC (download)

DivX HD

Only for training and service purposes

5. Component Video Input (Y, CB/PB, CR/PR)

No. Specification Remark

Resolution H-freq(kHz) V-freq(Hz)

1. 720x480 15.73 60.00 SDTV,DVD 480i

2. 720x480 15.63 59.94 SDTV,DVD 480i

3. 720x480 31.47 59.94 480p

4. 720x480 31.50 60.00 480p

5. 720x576 15.625 50.00 SDTV,DVD 625 Line

6. 720x576 31.25 50.00 HDTV 576p

7. 1280x720 45.00 50.00 HDTV 720p

8. 1280x720 44.96 59.94 HDTV 720p

9. 1280x720 45.00 60.00 HDTV 720p

10. 1920x1080 31.25 50.00 HDTV 1080i

11. 1920x1080 33.75 60.00 HDTV 1080i

12. 1920x1080 33.72 59.94 HDTV 1080i

13. 1920x1080 56.250 50 HDTV 1080p

14. 1920x1080 67.5 60 HDTV 1080p

No. Specification Proposed Remarks

Resolution H-freq(kHz) V-freq(Hz) Pixel Clock(MHz)

1. 720*400 31.468 70.08 28.321 For only DOS mode

2. 640*480 31.469 59.94 25.17 VESA Input 848*480 60 Hz, 852*480 60 Hz

-> 640*480 60 Hz Display

3. 800*600 37.879 60.31 40.00 VESA

4. 1024*768 48.363 60.00 65.00 VESA(XGA)

5. 1280*768 47.78 59.87 79.5 WXGA

6. 1360*768 47.72 59.8 84.75 WXGA

7. 1920*1080 66.587 59.93 138.625 WUXGA FHD model

6. RGB Input (PC)

Only for training and service purposes

7. HDMI Input

(1) DTV Mode

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

1. 720*400 31.468 70.08 28.321 HDCP

2. 640*480 31.469 59.94 25.17 VESA HDCP

3. 800*600 37.879 60.31 40.00 VESA HDCP

4. 1024*768 48.363 60.00 65.00 VESA(XGA) HDCP

5. 1360*768 47.72 59.8 84.75 WXGA HDCP

6. 1920*1080 67.5 60.00 138.625 WUXGA HDCP/FHD model

(2) PC Mode

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

1. 720*480 31.469 /31.5 59.94 /60 27.00/27.03 SDTV 480P

2. 720*576 31.25 50 54 SDTV 576P

3. 1280*720 37.500 50 74.25 HDTV 720P

4. 1280*720 44.96 /45 59.94 /60 74.17/74.25 HDTV 720P

5. 1920*1080 33.72 /33.75 59.94 /60 74.17/74.25 HDTV 1080I

6. 1920*1080 28.125 50.00 74.25 HDTV 1080I

7. 1920*1080 26.97 /27 23.97 /24 74.17/74.25 HDTV 1080P

8. 1920*1080 33.716 /33.75 29.976 /30.00 74.25 HDTV 1080P

9. 1920*1080 56.250 50 148.5 HDTV 1080P

10. 1920*1080 67.43 /67.5 59.94 /60 148.35/148.50 HDTV 1080P

Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied to all of the LCD TV with

LD12B chassis.

2. Designation

(1) Because this is not a hot chassis, it is not necessary to use

an isolation transformer. However, the use of isolation

transformer will help protect test instrument.

(2) Adjustment must be done in the correct order.

(3) The adjustment must be performed in the circumstance of

25 ºC ± 5 ºC of temperature and 65 % ± 10 % of relative

humidity if there is no specific designation.

(4) The input voltage of the receiver must keep AC 100-240

V~, 50 / 60Hz.

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

the adjustment when module is in the circumstance of over

15.

In case of keeping module is in the circumstance of 0 °C, it

should be placed in the circumstance of above 15 °C for 2

hours

In case of keeping module is in the circumstance of below -

20 °C, it should be placed in the circumstance of above 15

°C for 3 hours.

[Caution]

When still image is displayed 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. Automatic Adjustment

3.1. MAC Address

(1) Equipment & Condition

- Play file: Serial.exe

- MAC Address edit

- Input Start / End MAC address

(2) Download method

1) Communication Prot connection

Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port

2) MAC Address & CI+ key Download

- Set CI+ key path Directory at start Mac & CI Download

Program

- Com 1,2,3,4 and 115200(Baud rate)

- Port connection button click(1)

- Push the (2) MAC Address write.

- At success Download, check the OK(3)

- Start CI+ Download, Push the (4)

- Check the OK or NG.(5)

3.2. LAN

(1) Equipment & Condition

AEach other connection to LAN Port of IP Hub and Jig

(2) LAN inspection solution

ALAN Port connection with PCB

ANetwork setting at MENU Mode of TV

Asetting automatic IP

ASetting state confirmation

-> If automatic setting is finished, you confirm IP and

MAC Address.

PCBA PC(RS-232C)

RS-232C Po rt

Only for training and service purposes

3.3. LAN PORT INSPECTION(PING TEST)

Connect SET -> LAN port == PC -> LAN Port

(1) Equipment setting

1) Play the LAN Port Test PROGRAM.

2) Input IP set up for an inspection to Test

Program.

*IP Number : 12.12.2.2

(2) LAN PORT inspection (PING TEST)

1) Play the LAN Port Test Program.

2) Connect each other LAN Port Jack.

3) Play Test (F9) button and confirm OK Message.

4) Remove LAN CABLE

3.4. Model name & serial number download

(1) Model name & Serial number D/L

APress “Power on” key of service remote control.(Baud

rate : 115200 bps)

AConnect RS232 Signal Cable to RS-232 Jack.

AWrite Serial number by use RS-232.

AMust check the serial number at Instart menu.

(2) Method & notice

A. Serial number D/L is using of scan equipment.

B. Setting of scan equipment operated 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)

There is impossible to download by bar code scan, so It

need Manual download.

a. Press the ‘instart’ key of ADJ remote control.

b. Go to the menu ‘5.Model Number D/L’ like below photo.

c. Input the Factory model name(ex 42LD450-ZA) or Serial

number like photo.

d. Check the model name Instart menu -> Factory name

displayed (ex 32LV3700-ZA)

e. Check the Diagnostics (DTV country only) -> Buyer model

displayed (ex 32LV3700)

4. Manual Adjustment

4.1. EDID(The Extended Display Identification

Data)/DDC(Display Data Channel) download

(1) Overview

It is a VESA regulation. A PC or a MNT will display an

optimal resolution through information sharing without any

necessity of user input. It is a realization of “Plug and Play”.

(2) Equipment

- Adjust remote control

- Since embedded EDID data is used, EDID download JIG,

HDMI cable and D-sub cable are not need.

(3)Download method

1) Press Adj. key on the Adj. R/C, 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/ RGB are Writing and display OK or NG.

(4) EDID DATA

AHDMI

SET PC

0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F

0x00 00 FF FF FF FF FF FF 00 1E 6D ⓐⓑ

0x01 ⓒ01 03 80 10 09 78 0A EE 91 A3 54 4C 99 26

0x02 0F 50 54 A1 08 00 71 40 81 C0 81 00 81 80 95 00

0x03 90 40 A9 C0 B3 00 02 3A 80 18 71 38 2D 40 58 2C

0x04 45 00 A0 5A 00 00 00 1E 66 21 50 B0 51 00 1B 30

0x05 40 70 36 00 A0 5A 00 00 00 1E 00 00 00 FD 00 39

0x06 3F 1F 52 10 00 0A 20 20 20 20 20 20 ⓓ

0x07 ⓓ01 ⓔ1

0x00 02 03 26 F1 4E 10 1F 84 13 05 14 03 02 12 20 21

0x01 22 15 01 26 15 07 50 09 57 07 67 ⓕ

0x02 ⓕE3 05 03 01 01 1D 80 18 71 1C 16 20 58 2C

0x03 25 00 A0 5A 00 00 00 9E 01 1D 00 80 51 D0 1A 20

0x04 6E 88 55 00 A0 5A 00 00 00 1A 02 3A 80 18 71 38

0x05 2D 40 58 2C 45 00 A0 5A 00 00 00 1E 66 21 50 B0

0x06 51 00 1B 30 40 70 36 00 A0 5A 00 00 00 1E 00 00

0x07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓔ2

Only for training and service purposes

ARGB

AReference

- HDMI1 ~ HDMI3 / RGB

- In the data of EDID, bellows may be different by S/W or

Input mode.

ⓐProduct ID

ⓑSerial No. : Controlled on product line

ex) Monthly : ‘01’ -> ‘01’

Year : ‘2010’ -> ‘14’

ⓓModel Name(Hex):

ⓔChecksum: Changeable by total EDID data.

ⓕVendor Specific(HDMI)

4.2. White Balance Adjustment

4.2.1. Overview

(1) W/B adj. Objective & How-it-works

(2) Objective: To reduce each Panel’s W/B deviation

(3) How-it-works : When R/G/B gain in the OSD is at 192, it

means the panel is at its Full Dynamic Range. In order to

prevent saturation of Full Dynamic range and data, one of

R/G/B is fixed at 192, and the other two is lowered to find

the desired value.

(4) Adj. condition : normal temperature

1) Surrounding Temperature : 25 ºC ± 5 ºC

2) Warm-up time: About 5 Min

3) Surrounding Humidity : 20 % ~ 80 %

4.2.2 Equipment

1) Color Analyzer: CA-210 (LED Module : CH 14)

2) Adj. Computer(During auto adj., RS-232C protocol is

needed)

3) Adjust Remote control

4) Video Signal Generator MSPG-925F 720p/204-Gray

(Model:217, Pattern:49)

-> Only when internal pattern is not available

AColor Analyzer Matrix should be calibrated using CS-1000

4.2.3. Equipment connection MAP

4.2.4. Adj. Command (Protocol)

- LEN: Number of Data Byte to be sent

- CMD: Command

- VAL: FOS Data value

- CS: Checksum of sent data

- A: Acknowledge

Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]

ARS-232C Command used during auto-adj.

Ex) wb 00 00 -> Begin white balance auto-adj.

wb 00 10 -> Gain adj.

ja 00 ff -> Adj. data

jb 00 c0

...

wb 00 1f -> Gain adj. completed

*(wb 00 20(Start), wb 00 2f(completed)) -> Off-set adj.

wb 00 ff -> End white balance auto-adj.

0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F

0x00 00 FF FF FF FF FF FF 00 1E 6D ⓐⓑ

0x02 0F 50 54 A1 08 00 71 4F 01 01 01 01 01 01 95 00

0x03 90 40 A9 C0 B3 00 02 3A 80 18 71 38 2D 40 58 2C

0x04 45 00 A0 5A 00 00 00 1E 66 21 50 B0 51 00 1B 30

0x05 40 70 36 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A

0x06 3E 1E 53 10 00 0A 20 20 20 20 20 20 ⓓ

0x07 ⓓ01 ⓔ3

Model Name HEX EDID Table DDC Function

ALL 0001 0100 Analog

0001 0100 Digital

MODEL MODEL NAME(HEX)

all 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20

INPUT MODEL NAME(HEX)

HDMI1 67 03 0C 00 10 00 B8 2D

HDMI2 67 03 0C 00 20 00 B8 2D

HDMI3 67 03 0C 00 30 00 B8 2D

RGB 67 03 0C 00 40 00 B8 2D

INPUT ⓔ1ⓔ2ⓔ3

HDMI1 7F D9 X

HDMI2 7F C9 X

HDMI3 7F B9 X

RGB X X 46

Color Analyzer

Computer

Pattern Generator

RS-23 2C

RS-232C

Probe

Signal Source

* If TV internal pattern is used, not needed

LEN CMD VAL CS

RS-232C COMMAND Explanation

[CMD ID DATA]

wb 00 00 Begin White Balance adj.

wb 00 10 Gain adj.(internal white pattern)

wb 00 1f Gain adj. completed

wb 00 20 Offset adj.(internal white pattern)

wb 00 2f Offset adj. completed

wb 00 ff End White Balance adj.(Internal pattern disappears)

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