Lg Flatron e1908s User manual

Only for training and service purposes

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COLOR MONITOR

SERVICE MANUAL

MODEL: E1908s (E1908s-PNT.A**DAS for

LCM190A1L0G)**Sales Market

CAUTION

BEFORE SERVICING THE UNIT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

*ToapplytheRealtek Chip.

Internal Use Only

Only for training and service purposes

CONTENTS

SPECIFICATIONS ..........................................................2

PRECAUTIONS ..............................................................3

TIMING CHART ..............................................................7

DISASSEMBLY ...............................................................8

BLOCK DIAGRAM.........................................................11

DISCRIPTION OF BLOCK DIAGRAM ......................... 13

ADJUSTMENT ............................................................. 14

SERVICE MODE ......................................................... 16

TROUBLESHOOTING GUIDE .................................... 17

WIRING DIAGRAM ...................................................... 23

EXPLODED VIEW........................................................ 24

SCHEMATIC DIAGRAM............................................... 26

SPECIFICATIONS

1. LCD CHARACTERISTICS

Type: Flat Panel Active matrix-TFT LCD

Active Display Area: 19 inches

Pixel Pitch: 0.2835 (H) x 0.2835 (V) mm

Color Depth: 16.7M colors

Size: 278(V) × 428 (H) × 11.6(D) (Typ.)

Interface: 2-channel LVDS

Surface Treatment: Anti-Glare (Haze25),

Hard coating (3H)

Operating Mode: Normally White

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio ≥10

θx+/θx-: 75(Min), 75(Typ)

θY+/θY-: 70(Min), 80(Typ)

2-2. Center Luminance of White: 200Cd / m2

2-3. Contrast Ratio:

700(min), 1000(Typ)

3. SIGNAL (Refer to the Timing Chart)

3-1. Sync Signal

Type: Separate Sync.

3-2. Video Input Signal

1) Type: R, G, B Analog, Digital

2) Voltage Level: 0.7 Vp-p

3) Input impedance: 75 Ω

3-3. Operating Frequency

Ho Horizontal: 30 ~ 83 kHz

Vertical: 56 ~ 75Hz

4. Max. Resolution

D-sub Analog: VESA 1440x 900 @ 75 Hz

5. POWER SUPPLY

5-1. Power: AC 100-240V~50/60Hz

5-2. Power Consumption

On Mode: 26 W (Typ.)

Sleep Mode: ≤0.5 W

Off Mode: ≤0.5 W

6. ENVIRONMENT

6-1. Operating

Temperature: 10°C to 35°C

Humidity: 10 % to 80% non-Condensing

6-2. Storage

Temperature: -20°C to 60 °C

Humidity: 5 % to 90 % non-Condensing

7. DIMENSIONS (with Stand)

Width: 43.86 cm (17.27 inches)

Depth: 18.00 cm (7.09 inches)

Height: 36.25 cm (14.27 inches)

8. WEIGHT (excl. packing)

Weight: 3.10 kg (6.82 lb)

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Only for training and service purposes

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Only for training and service purposes

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Only for training and service purposes

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Only for training and service purposes

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Only for training and service purposes

TIMING CHART

Display Modes (Resolution) Horizontal Freq. (kHz) Vertical Freq. (Hz)

1 640 x 480 31.469 59.940

2 640 x 480 37.500 75.000

3 800 x 600 37.879 60.317

4 800 x 600 46.875 75.000

5 1024 x 768 48.363 60.004

6 1024 x 768 56.476 70.069

7 1024 x 768 60.023 75.029

8 1280 x 1024 63.981 60.020

9 1280 x 1024 79.976 75.025

10 1440 x 900 55.935 59.887

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Only for training and service purposes

DISASSEMBLY-Set

#1

Put the monitor on a soft flat and unscrew the screw

to remove the stand and the base.

#2

Use tool to open all latches.

#3

Put the front face down, disassemble back cover.

#4

Pull the key board out of bezel.

#5

Disassemble the LVDS cable and tear the aluminum

foils.

#6

Unscrew the 6 screws to remove the main board,

the power board and the adapter board.

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Only for training and service purposes

#7

The mainframe.

#8

Disconnect the marked cables from the boards.

#9

Unscrew the 4 screws to remove the bezel.

#10

The panel.

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Only for training and service purposes

DISASSEMBLY-Stand

#1

Press the release button.

#2

Consequently, pull the base directly.

#3

The stand.

#4

Directly remove the stand cover by hand.

#5

Unscrew the 3 screws to remove the hinge and the

stand.

#6

Stand cover, stand and hinge.

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Only for training and service purposes

BLOCK DIAGRAM

MAIN BOARD

U401

DDC-DSUB PORT

SCALAR RTD2271-GR

Crystal X401

14.31818MHZ

CN402 to Keyboard

A

/D in

p

ut control

M24C16-WMN6TP

U402

CN406 to Panel

LVDS out

p

ut

Panel Power

sequence

control circuit

Block Q705

Q706

Power input

CN701

LDO

U701

CAPACITOR

U703

3.3V 1.2V

DSUB

CN101

EEPROM

U101

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Only for training and service purposes

POWER BOARD

EMI filter

Start Resistor

(R920, R921, R922)

PWM Control

(IC901)

Transformer

AC input Bridge

Rectifier

and Filter

Feedback

Circuit

Rectifier

diodes

Photo coupler

(IC902)

ZD801

LED

(CN802)

PWM Control

TA9690GN

(IC801)

14.5V

MOSFET

(Q801)

DIM

ENA

L801

LED

(CN803)

PWM Control

TA9690GN

(IC802)

14.5V

5V

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Only for training and service purposes

DESCRIPTION OF BLOCK DIAGRAM

1. Video Controller Part.

This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the

digital video signal using a pixel clock.

The pixel clock for each mode is generated by the PLL.

The range of the pixel clock is from 25.175MHz to 106.6MHz.

This part consists of the Scalar, ADC converter, TMDS receiver and LVDS transmitter.

The Scalar gets the video signal converted analog to digital, interpolates input to 1440 X 900 resolution signal and

outputs 8-bit R, G, B signal to transmitter.

2. Power Part.

This part consists of the one 3.3V, and one 1.2V regulators to convert power which is provided 5V in Power board.

12V is provided for inverter board, 5V is provided for LCD panel.

Also, 5V is converted 3.3V and 1.2V by regulator. Converted power is provided for IC in the main board.

The inverter operates back-light lamps of module.

3. MICOM Part.

This part is including video controller part. And this part consists of Reset IC and the Micom.

The Micom distinguishes polarity and frequencies of the H/V sync are supplied from signal cable.

The controlled data of each mode is stored in scalar.

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Only for training and service purposes

ADJUSTMENT

Windows EDID V1.0 User Manual

Operating System: DOS, windows98, 2000, XP

1. Parallel port setting

Enter your bios, and do as followings.

a) Integrated peripheral

b) Super IO Device

c) Parallel port mode

you should set the” parallel port mode” to SPP for using the DOS EDID tool surely.

2. EDID Write

1、Connect the signal line of monitor with DDC recorder.

2、Choose the DDC RECORD program, and it shows on the screen, the choose the correct source base on the

monitor.

3、Click “LoadFile” ,then key in the manufacturer name, model name, product code, then choose the correct

model name base on the monitor.(As Fig.2)

4、Scan serial No. to DDC recorder by Bar Reader, then read again in the Verify SN.

5、According to the message of DDC program, when the picture as fig.1 appears, it show DDC record has finished.

Fig.1

Please check Manufacturer Name, Vendor Assigned Code, Monitor Name , Serial Number：

*****[????????******] (it must be the same as Bar Code)、Week of Manufacture：**, Year of Manufacture：****,

Checksum：** (It must be the same as the last byte of data table, as follows picture shows). Above of all must be

right, then if it shows the green “PASS”, it means record succeeds ,the red “Fail” means record fails; Then check

the power supply and signal line, and ensure they are connected well ,then do DDC record again from the third

step.

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Only for training and service purposes

Fig.2

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Only for training and service purposes

1) Turn off the power switch at the front side of the display.

2) Wait for about 5 seconds and press MODE, POWER switch with 1 second interval, press MENU.

3) The SVC OSD menu contains additional menus that the User OSD menu as described below.

a) Auto Level: PASS FAIL

b) R/G/B-Gain: Allows you to set the R/G/B-Gain value manually. (Analog Only)

c) R/G/B-Offset: Allows you to set the R/G/B-Offset value manually. (Analog Only)

d) R/G/B-6500K: Allows you to set the R/G/B-6500K value manually.

e) R/G/B-9300K: Allows you to set the R/G/B-9300K value manually.

f) R/G/B-User: Allows you to set the R/G/B-User value manually.

g) R/G/B-sRGB: Allows you to set the R/G/B- sRGB value manually.

h) R/G/B-Nor: Allows you to set the R/G/B- Nor value manually.

i) Burn In: OFF

e) Panel Sel: TPVTPM190AWXGA

Figure 1 Cable Connection for Micom uploading

SERVICE MODE

Connect to

the PC

Connect to

the monitor

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Only for training and service purposes

TROUBLESHOOTING GUIDE

No Power

(Power Indicator Off)

Please reinsert and

make sure the AC of

100-240V is normal

Measure U703 PIN2

=1.2V

U701 PIN2=3.3V

Check the Adapter/Inverter

section

Check CN701 or replace

U703, and U701

NO

YES

1. NO POWER

Check X401 oscillate

waveforms are normal

Replace X401



Replace U401



NO

YES

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Only for training and service purposes

2. NO RASTER (OSD IS NOT DISPLAY)-LIPS

LIPS

YES

1. Check C703

2. Check C711, C713

3. Trouble in Scaler IC

NO

YES

Check CN701

PIN 6 =5V?

NO Check BL ON/OFF pulse as

Contacting scope

No Raster

(OSD Is Not Displayed)

Check U701

PIN 2 =3.3V?

Check CN701

PIN 6 =5V?

Check power board and find out a

short point as penning each power

line.

1. Check U701

2. Check C702,C703,C704

Check U703

1.2V?

NO

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Only for training and service purposes

3. NO RASTER (OSD IS NOT DISPLAY)-MSTAR

1. Check C415 C418

2. Check X401

3. Trouble in Scaler IC

Scaler pin 127,

128 oscillates as

14.31818 MHz?

No Raster

(OSD Is Not Displayed)

Check connection line from

D-SUB to Scaler

Trouble in cable or LCD

module

NO

YES

NO

Scaler IC

pin 22 H Sync ?

pin 21 V Sync?

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Only for training and service purposes

4. TROUBLE IN DPM

Trouble in DPM

Scaler IC

pin 22 H Sync?

pin 21 V Sync?

Check H/V sync line

Trouble in cable or LCD

module

NO

YES

LG Flatron E1908s User manual

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