LG W1943SB Service Manual

E-mail: http://www.LGEservice.com/techsup.html

COLOR MONITOR

SERVICE MANUAL

MODEL: W1943SB (W1943SB-PFT.A**NAPH for

LGD TLC1, W1943SB-PFT.A**VAPH for AUO V00

CAUTION

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

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CONTENTS

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

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

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

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

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

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

ADJUSTMENT ...................................................... 15

SERVICE MODE ......................................................... 17

TROUBLESHOOTING GUIDE .............................. 18

WIRING DIAGRAM ................................................... 24

EXPLODED VIEW...................................................... 25

REPLACEMENT PARTS LIST ................................. 27

DIFFERENT PARTS LIST….......................................... 34

SCHEMATIC DIAGRAM

SPECIFICATIONS

1. LCD CHARACTERISTICS

Type: matrix-TFT Color LCD Module

Active Display Area: 18.51 inches

Pixel Pitch: 0.3 (H) x 0.3 (V)mm

Color Depth: 16.7M colors

Size: 430.4(H) x 254.6(V) x 13.0(D) mm(Typ.)

Interface: LVDS 1Port

Surface Treatment: Hard-coating(3H), Anti-Glare

Operating Mode: Normally White, Transmissive

mode

Backlight unit: 2 CCFL

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio > 10

Left : 70°min, 85°(Typ) Right : 70°min, 85°(Typ)

Top :60° min, 75°(Typ) Bottom : 70°min,85°(Typ)

2-2.Luminance :250Cd / m

-6500K; 170Cd / m

2-3. Contrast Ratio : 600(min), 1000(Typ)

3. SIGNAL (Refer to the Timing Chart)

3-1. Sync Signal

Type: Separate Sync, SOG (Sync On Green)

3-2. Video Input Signal

1) Type: R, G, B Analog

2) Voltage Level: 0~0.7 Vp-p

3) Input impedance: 75 

3-3. Operating Frequency

Horizontal: 30 ~ 83kHz

(min), 300Cd / m2 (Typ)

(min) -9300K

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Vertical: 56 ~ 75Hz

4. Max. Resolution

D-sub Analog: VESA 1360 x 768 @ 60 Hz

5. POWER SUPPLY

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

5-2. Power Consumption

On Mode: 21 W(Typ.)

Sleep Mode:  1 W

Off Mode:  1 W

6. ENVIRONMENT

6-1. Operating

Temperature: 10°C~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: 70000 Hours (Not include panel)

Lamp Life:  50000 Khrs

7. DIMENSIONS (with Stand)

Width: 44.90 cm (17.68 inches)

Depth: 18.30 cm (7.20 inches)

Height: 29.05 cm (11.44 inches)

8. WEIGHT (excl. packing)

Weight: 3.3 kg (7.28 lbs)

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TIMING CHART

mode section polarity

H(Pixels) - 31.468 900 720 18 108 54

V(Lines) +

H(Pixels) - 31.469 800 640 16 96 48

V(Lines) -

H(Pixels) - 37.5 840 640 16 64 120

V(Lines) -

H(Pixels) + 37.879 1056 800 40 128 88

V(Lines) +

H(Pixels) + 46.875 1056 800 16 80 160

V(Lines) +

DOT

CLOCK

[MHz]

28.321

25.175

31.5

40.0

49.5

Front

Frequency

[kHz]/[Hz]

70.08 449 400 12 2 35

59.94 525 480 10 2 33

75 500 480 1 3 16

60.317 628 600 1 4 23

75.0 625 600 1 3 21

Total

Period(E)

Display

(A)

Sync.

Porch

(C)

(D)

Back

Porch

(B)

Resol-

ution

720 X

400

640 x

480

640 x

480

800 x

600

800 x

600

H(Pixels) +/- 49.725 1152 832 32 64 224

57.283

V(Lines) +/-

H(Pixels) - 48.363 1344 1024 24 136 160

V(Lines) -

H(Pixels) - 60.123 1312 1024 16 96 176

V(Lines) -

H(Pixels) + 47.712 1792 1360 64 122 256

V(Lines) +

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65.0

78.75

85.5

74.55 667 624 1 3 39

60.0 806 768 3 6 29

75.029 800 768 1 3 28

60.015 795 768 3 6 18

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832 x

1024 x

624

768

1360

x768

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DISASSEMBLY-Set

Put the monitor on a soft flat.

Revolve the release button.

Consequently, pull the base directly.

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Put the front cover upward. Then let the all

latches are separated.

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The base.

Put the front face down, disassembly back

cover.

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＃8

#11

Pull the key board out of bezel.

Disassembly the LVDS cable.

Disassembly the bezel.

#10

Disassemble the connector.

#12

Main board and power board.

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The panel.

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#13

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#14

Rear cover and hinge ASS’Y.

#15

Disassemble the hinge and stand.

Disassemble the rear cover and hinge ASS’Y.

#16

Hinge top, hinge and stand.

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BLOCK DIAGRAM

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Power

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BLOCK DIAGRAM-POWER

100~240V

Inverter

EMI filter

14.5V

5V/14.5V

output OVP

Push-pull

circuit

Rush

prevention

Rectification

Feedback

control

circuit

Transformer

conversion

Starting

resistor

Transformer

Switching

circuit (PWM

control IC &

MOSFER)

LC resonance

Diode

rectifier

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OVP protect

circuit

14.5V

ON/OFF

ON/OFF circuit

DIM

VDDA

DIM circuit

PWM IC

OZ9938GN

OVP circuit

Feedback

circuit

2 CCFL lamps

Sampling

Lamp open

protection

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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 85.5MHz.

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 1360 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, 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 converts from DC 14.5V to AC 700Vrms and 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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