LG 23ET83V Service Manual

Internal Use Only

North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com

LED TOUCH MONITOR

SERVICE MANUAL

CHASSIS : LM13J

MODEL : 23ET83V 23ET83V-WB

CAUTION

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

Printed in KoreaP/NO : MFL63731118 (1301-REV00)

CONTENTS

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

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

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

ADJUSTMENT INSTRUCTION ................................................................ 5

BLOCK DIAGRAM .................................................................................... 9

EXPLODED VIEW .................................................................................. 10

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

Only for training and service purposes

- 2 -

To Instrument's exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.

AC Volt-meter

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 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 sh orts of the cir cui try 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 M 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.

Ω and 5.2 MΩ.

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

Only for training and service purposes

- 3 -

SPECIFICATION

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

1. Application range

This spec sheet is applied all of the Monitor with LM13J chassis.

2. Requirement for Test

Each part is tested as below without special appointment.

(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °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

ea ch dra wing and spe cificat ion by part n umber 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 : MIC Class A

- EMC : MIC Class A

4. Module General Specification

(1) 23ET83

No Item Content Remark

1 Customer BRAND

2 User Model Name 23ET83

3 Sale region Refer to Sufx standard

4 Feature 23” Multi touch Wide LCD MONITOR

5 Chassis Name LM13J

6 General Scope External SW &Adj. Menu, My-Key , Function, Auto, input/Exit, Power

Function OSD,DDC2B,DDC2AB, HDCP, Control Lock,

Original Ratio / Wide, Black level, Super Energy Saving

7 Power Code Length : 1.0±0.05 M

Shape : Wall-out Color : Black

8 Cable Signal Cable

(D-SUB

USB cable Length: 1.87m

Audio Length : ,Shape : ,Color: ,Pin Do not Support

TV Length : ,Shape : ,Color: ,Pin Do not Support

9 Power(Power Update) Input: AC100~240V 50~60Hz,1.0A Max

10 Applying module list P/No : EAJ62311001

Length : 1.5m Shape : Detachable Type Color : Black Pin : Triple Row, 15 Pin D-Sub

Shape : Detachable Type Color: BLACK Pin : 4P

Output: DC 19V 1.3 A

Specication : LM230WF3-SLK1

Refer to Sufx standard

and power cord table

Refer to Sufx standard

Only for training and service purposes

- 4 -

ADJUSTMENT INSTRUCTION

1. Application Range

This spec. sheet applies to LM13J chassis applied Monitor all models manufactured in TV factory.

2. Designation

(1) Th e ad justm ent is accord ing to the order whic h is

designated and which must be followed, according to the

plan which can be changed only on agreeing. (2) Power Adjustment: Free Voltage (3) Magnetic Field Condition: Nil. (4) Input signal Unit: Product Specification Standard (5) Reserve after operation: Above 5 Minutes (Heat Run)

Temperature : at 25 °C ± 5 °C Relative humidity : 65 % ± 10 % Input voltage : 100 V~ 240 V, 50/60Hz

(6) Adju stment equ ipments: Color Ana lyzer (CA-210 or

CA-110), DDC Adjustment Jig equipment,

3. Adjustment

3.1. Overview

Use factory automation equipment and adjust automatic movement. But, do via passivity adjust in error occurrence.

3.2. Adjustment order

(refer to th e Ad justment st andard and ad ju stment

command table)

3.2.1. Board Assembly Line

■ Connect input signal to 15pin D-sub.

■ Ready for adjustment : check whether adjustment command

works normally or not and the operating state of each mode.

■ Check the display state of gray color when 256 gray scale

pattern is embodied.

■ Read by EEPROM Read Command to check whether initial

value is correct or not.

3.2.2 Total Assembly Line

■ Input analog signal. (1920x1080@60Hz)

■ Write HDCP Key to EEPROM(24C16) by using DDC2AB

protocol & HDCP Adjusting Jig equipment [ Address 0xAC 80, 289 bytes ]

■ If error is occurred, write and check again.

■ Ready : Heat-run during 5 minutes in the state with signal

■ Connect input signal to D-sub.

■ Default value before adjustment :

Energy saving : off , Brightness “100(Max)”

3.2.3.

Adjustment of Horizontal/Verticality screen position, Clock and Clock Phase at each Mode.

■ There is no special factory mode adjustment.

Writing initial value of EEPROM in Board Assembly line is

adjusting Preset Mode an d Reset mode. (EEPROM is initialized when AC Power is ON first.)

■ If the change of FOS data is needed after M.P, it is possible

by writing Mode Data with EEPROM write command or modifying the Mode Data in MICOM itself.

3.2.4. Color coordinates adjustment and Luminance adjustment.

3.2.4.1. Color coordinates adjustment

■ Monitor Contrast / Brightness

- Energy saving : off

- Contrast : 70

- Brightness : 100(Max)

■ CA-110/CA-210 :

Set “Channel 7”-> CA-110: channel: 8. CA-210: channel 14

■ Signal Generator :

At cut-off and drive -> 16 step pattern for ADC

- Output Voltage : 700 mVp-p

- Output Mode : MSPG Timing : 126( 1920x1080 + 60Hz ) mode Setting.

3.2.4.2. Adjustment : Board Assembly Line

- 23ET83 model use internal ADC, no need connect D-SUB cable

- Internal ADC steps as below

- On AC power on with Aging mode, checking the ADC values and then decide to do or not,

• Read ADC OFFSET and GAIN flags from 0xA6 0xFD, 0xFE

on NVRAM

• If those values are not 0xAA on Aging mode, must do

internal ADC calibration.

• If the result of internal ADC calibration is OK, save the ADC

result and make the OFFSET and GAIN flags to 0xAA and make the Internal_ADC flag to INTERNAL.

• Display the result of ADC on Aging Mode OSD and Service

OSD

- If don’t use internal ADC, please follow below step

■ Input 16 step pattern for ADC (Mode12, pattern 11/ MSPG :

timing 126, pattern 29). (Video level : 700 mVp-p)

■ Adjust by commanding AUTO_COLOR_ADJUST

■ Confirm “Success” message in Screen or Check the data of

0xFD, 0xFE address of EEPROM(0XA6) is 0xAA after waiting 5 seconds

■ If there is “FAULT” message or the data of 0xFD, 0xFE

address of EEPROM(0xA6) is not 0xAA, do adjust again

■ If all Adjustment is completed, the values of Warm(6500K),

User Color and Cool(Cool(9300K)) are saved automatically.

3.2.4.3. Confirm at Total Assembly Line: adjustment

■ Check the data of 0xFD, 0xFE address of EEPROM(0xA6)

is 0xAA.

■ If the data 0xFD, 0xFE address of EEPROM(0xA6) is not

0xAA, do adjust again by 3.2.4.2.

(Caution) Must keep power-on more than 3 seconds after AC

Power-on first time.

Only for training and service purposes

- 5 -

3.2.4.4. confirm PRESET Warm(6500K) Color coordinates Don’t need to adjust Warm(6500K) color. Warm(6500K) color R, G, B gain are saved by FW calculation.

23ET83

-. R Gain : 6500K_R = 128

-. G Gain : 6500K_G = 128

-. B Gain : 6500K_B = 128

■ Check the Warm(6500K) whether meet x/y color coordinate

as below or not:

X 0.313 ± 0.03

Y 0.329 ± 0.03

3.2.4.5. confirm PRESET Cool(9300K) Color coordinates. Don’t need to adjust Cool(9300K) color. Cool(9300K) color R, G, B gain are saved by FW calculation.

23ET83

-. R Gain : 9300K_R = 6500K_R – 17

-. G Gain : 9300K_G = 6500K_R – 16

-. B Gain : 9300K_B = 6500K_R

■ Check the Warm(9300K) whether meet x/y color coordinate

as below or not:

3.2.5.3. Confirm Auto adjustment operation.

■ Input Analog 1 Dot on/off & Rectangle Pattern at Mode 12(1920x1080@60Hz / MSPG 126)

■ Con fi rm a dj us tm en t op er ation by c ha nging Clock,

Phase,H/V Position.

■ Check Clock, Phase by pressing AUTO Key.

■ Confirm first set of new lot by periods

3.2.5.4 Other quality

■ Confirm that each items satisfy under standard condition

that was written product spec.

■ Confirm Applying Module & MICOM Setting -> Confirm with

Service OSD

■ Confirm at Service OSD by “Menu + Power key” on .(from

Power off)

■ Confirm first set of new lot by period s, and co nfirm

periodically when there is Process change or Adjustment setting change.

3.2.5.5. OSD & Adj ustment de vice Confi rmation : Co nfirm operation mentioned as product spec.

■ Vary Brightness and Contrast and confirm the variation of

Luminance and display status.

■ Operate the f-engine function and confirm variation of

Luminance.

■ Make sure to do FACTORY RESET after confirmation of

OSD function.

X 0.283 ± 0.03

Y 0.298 ± 0.03

3.2.4.6. Confirm User color coordinates .

■ C onf ir m W het he r U se r c olo r is sa ved s ame a s

Warm(6500K).

■ A ft er co nf ir mi ng Colo r coordina te s, Must return t o

Warm(6500K)

■ Confirm whether user color is 50. If the value of user

color(R/G/B) is 30, do adjust again by 3.2.4.2.

3.2.5. Confirm Operation state.

3.2.5.1 Operation mode : Confirm whether each appointed mode operate correctly or not.

3.2.5.2 Confirmation of Adjustment condition and operation :

Co nfirm whe ther it meet Auto/ Manua l equipement Adjustment standard or not.

■ Confirm Analog screen state :

Confirm screen state at below mode. Appointment mode :

640*480 @60Hz (Timing 35), 800*600@75Hz(Timing 48) 1024*768@60Hz(Timing 60), 1280*1024@60Hz(Timing

99), 1680*1050@60Hz(Timing 122), 1920*1080@60HZ(Timing 126)

SMPTE pattern(No,17/Check 0%,5%,95%,100%) –Mode can be added.

■ Check HDCP signal screen by using Video generator that

generate HDCP signal

3.2.5.6. Confirm the display state by inputting 8 color Bar Pattern & 256 Gray Scale pattern.

3.2.5.7. DPM operation confirmation : Check if Power LED Color and Power Consumption operates as standard.

■ Measurement Condition : 230V@ 50Hz (Analog)

■ Confirm DPM operation at the state of screen without Video

Signal.(refer to Spec at Page 11)

3.2.5.8. DDC EDID Write

- HDMI part EDID data

- 23ET83 No need input HDMI EDID on the line, F/W include HDMI EDID, aging on MO DE If AC ON, HDMI EDID automatic load to EEPROM(24C02).

- After input D-sub EDID, Please send command “0x77 0 1” to update the S/N of HDMI1, HDMI2 EDID, and then check the address 0xE8 data. If Serial number is updated properly, it should be 0xDD.

Other model if need input EDID on the line, please refer below steps:

■ Confirm whether module selection is correct or not on the

self-diagnostics OSD with signal cable disconnected.

■ Connect HDMI Signal Cable to DVI-D wafer.

■ Write EDID DATA to EEPROM(24C02) by using DDC2B

protocol.

■ Check whether written EDID data is correct or not.

Only for training and service purposes

- 6 -

+ 12 hidden pages

LG 23ET83V Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual