Lg E1941s User manual

Only for training and service purposes

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COLOR MONITOR

SERVICE MANUAL

MODEL: E1941S (E1941S-BNT.A**TOV for AUO M185XW01 VD0A;

E1941S-BNT.A**NOV for LGD LM185WH2-TLA1) **Sales Market

CAUTION

BEFORE SERVICING THE UNIT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

*ToapplytheNovatek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 ......................... 14

ADJUSTMENT ............................................................. 16

SERVICE MODE ......................................................... 18

TROUBLESHOOTING GUIDE .................................... 19

WIRING DIAGRAM ...................................................... 26

EXPLODED VIEW........................................................ 27

SVC SHEET...................................................................….

SPECIFICATIONS

1. LCD CHARACTERISTICS

Type: Flat Panel Active matrix-TFT LCD

Active Display Area: 18.5 inches

Pixel Pitch: 0.300 mm x 0.300 mm

Color Depth: 16.7M colors

Size: (LGD) 430.4(H) x 254.6(V) x 9.7(D) mm Typ.

(AUO) 430.4(W) x 254.6 (H) x 9.9 (D) mm Typ.

Interface: LVDS 1Port

Surface Treatment: Anti-Glare, 3H

Operating Mode: Tran missive mode, Normally

White

2. OPTICAL CHARACTERISTICS

2-1. V Viewing Angle by Contrast Ratio >5

Left/Right: 150(Min), 176(Typ)

Top/Bottom: 140(Min), 170(Typ)

2-2. Luminance: 200(Min.) 250(Typ.) - Warm;

150(Min) - Cool

2-3. Contrast Ratio:

600(min), 1000(Typ)

3. SIGNAL (Refer to the Timing Chart)

3-1. Video Input Signal

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

2) Voltage Level: 0.7 Vp-p

3) Input impedance: 75 Ω

3-2. Operating Frequency

Horizontal: 30 ~ 61 kHz

Vertical: 56 ~ 75Hz

4. Max. Resolution

VESA 1366 x 768 @ 60 Hz

5. POWER SUPPLY

5-1. Power: AC 100-240 V~ 50 / 60 Hz 0.8 A

5-2. Power Consumption

On Mode: 18 W (Typ.)

6. ENVIRONMENT

6-1. Operating

Temperature: 10 to 35 °C

Humidity: 10 % to 80% non-Condensing

6-2. Storage

Temperature: -20°C to 60 °C

Humidity: 5 % to 90 % non-Condensing

6-3. MTBF: ≥187000 Hours before PRM

7. DIMENSIONS (with Stand)

Width: 44.30 cm

Depth: 16.60 cm

Height: 35.00 cm

8. WEIGHT (excl. packing)

Weight: 2.8kg

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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

Mode Section Polarity

Dot

Clock

[Mhz]

Frequency

[kHz]/[Hz]

Total

Period(e)

Display

(a)

Front

Porch

(d)

Sync.

(c)

Back

Porch

(b)

Resol-Ution

1 H(Pixels) -

28.321

31.468 900 720 18 108 54

720 x 400

V(Lines) + 70.08 449 400 12 2 35

2 H(Pixels) -

25.175

31.469 800 640 16 96 48

640 x 480

V(Lines) - 59.94 525 480 10 2 33

3 H(Pixels) -

31.5

37.5 840 640 16 64 120

640 x 480

V(Lines) - 75 500 480 1 3 16

4 H(Pixels) +

40.0

37.879 1056 800 40 128 88

800 x 600

V(Lines) + 60.317 628 600 1 4 23

5 H(Pixels) +

49.5

46.875 1056 800 16 80 160

800 x 600

V(Lines) + 75.0 625 600 1 3 21

6 H(Pixels) +/-

57.283

49.725 1152 832 32 64 224

832 x 624

V(Lines) +/- 74.55 667 624 1 3 39

7 H(Pixels) -

65.0

48.363 1344 1024 24 136 160

1024 x 768

V(Lines) - 60.0 806 768 3 6 29

8 H(Pixels) -

78.75

60.123 1312 1024 16 96 176

1024 x 768

V(Lines) - 75.029 800 768 1 3 28

9 H(Pixels) +

85.5

47.712 1792 1366 64 122 256

1366 x768

V(Lines) + 60.015 795 768 3 6 18

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Only for training and service purposes

DISASSEMBLY-Set

#1

Put the monitor on a soft flat.

#2

Unscrew the 1 screw to pull out the base.

#3

The base.

#4

Give the stand a hard pull.

#5

Use hands to open all latches.

#6

 

Put the front face down, disassembly back

cover.

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Only for training and service purposes

#7 

Pull the key board out of bezel.

#8 

Disassembly the FFC cable.

#9 

Tear up the tapes to remove the MAIN_FRAME.

#10 

Turn over the MAIN_FRAME and disconnect

the key board cable.

#11

Unscrew the screws (DVI just for E1941T).

#12

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Unscrew the screws on power board.

.

#13

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Unscrew the screw on main board.

#14

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Remove the bezel.

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Only for training and service purposes

#15 

The panel.

#16 

Rear cover and BRACKET.

#17 

Stand and hinge.

#18 

Disassemble the stand and hinge.

#19

Hinge and stand.

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Only for training and service purposes

BLOCK DIAGRAM

Main board

U401

DDC-DSUB PORT

SCALAR NT68168AFG

DSUB

CN101

Crystal X401

12MHZ

CN407 to Keyboard

A/D input control

RGB, H/V SYN

SCL, SDA, WP

Serial Flash

U402

To Power Block

Brightness control

CN405 to Panel

LVDS out

p

ut

Panel Power

sequence

control circuit

Block

Q405

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Only for training and service purposes

Power board

LGD panel

Adapter Board



Converter Board

DIM

ENA

Feedback Circuit

Transformer

(ZD801)

MOSFET

(Q801)

PWM Control

TA9690GN

(IC801)

12V

16V transfer to

5V for IC801

Inverter

Connector

(CN803)

Photo coupler

(U902)

EMI filter

H.V Start

(R908,R911)

PWM Control

LD7576AGR

(U901)

Transformer

(T901)

AC input 14.5V

5V

Bridge Rectifie

r

and Filter Rectifier diodes

Power Switch

(

Q901

)

Regulator

Current limit feedback

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Only for training and service purposes

AUO PANEL

Boost Circuit Ignition LED bar

ON/OFF circuit

Current balance

Control IC

OZ9998BGN Feedback

circuit

OVP circuit

Current

Feedback

DIM circuit

14.5V

ON/OFF

DIM

Photo coupler

(U902)

EMI filter

H.V Start

(R908,R911)

PWM Control

LD7576AGR

(U901)

Transformer

(T901)

AC input 14.5V

5V

Bridge Rectifie

r

and Filter Rectifier diodes

Power Switch

(

Q901

)

Regulator

Current limit feedback

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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 25MHz to 149MHz.

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 1366 x 768 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 1.8V regulators to convert power which is provided 5V in Power board.

14.5V is provided for inverter board, 5V is provided for LCD panel.

Also, 5V is converted 3.3V and 1.8V 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

Power Board Block Diagram

1. Boost circuit: Boost converter, the function is to convert 14.5V to the turn-on voltage of LED.

2. ENA circuit: Main board provides ENA signal to make the converter system On or Off.

3. DIM circuit: Main board provides PWM signal to make the light LED On or Off.

4. IC TA9690GN: Converter controls IC, the function: provide PWM driver signal to Boost converter, balance the

LED current, set the maximum output voltage of OVP.

5. OVP circuit: set the maximum output voltage of OVP, through this voltage IC can neglect the OPEN’s string.

6. Current feedback: LED feedback current detection.

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Only for training and service purposes

ADJUSTMENT

Note: The pictures take E2241 for example

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

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Fig.2

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Only for training and service purposes

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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) CLEAA ETI: NO

b) Auto Color: NO

c) AGING: OFF

d) PANEL: AUO240/1080

e) NVRAM INIT: NO

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

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

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

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

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

Figure 1 Cable Connection for Micom uploading

SERVICE MODE

Connect to

the PC Connect to

the monitor



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 U701 PIN2

=3.3V



Check the Adapter/Inverter

section

Check CN404 or replace

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

Check CN404

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 CN404

PIN 6 =5V?

Check power board and find out a

short point as penning each power

line

1. Check U701

2. Check C701,C702,C703

NO

LG E1941S User manual

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