LG CB775C-NA CA-80 Schematic

1. PICTURE TUBE

Size : 17 inch (Flat Square Tube) DefIection Angle : 90° Neck Diameter : 29.1 mm Transmission : 46% Dot Pitch : 0.27 mm Face Treatment : AR-ASC (Anti-Reflection and

Anti-Static Coating)

Low Radiation : TCO-99 (S/W 775E)/

MPR-II (S/W 775N)

2. SIGNAL

2-1. Horizontal & Vertical Sync

1) Input Voltage Level: Low=0~1.2V, High=2.5~5.5V

2) Sync Polarity : Positive or Negative

2-2. Video Input Signal

1) Voltage Level : 0 ~ 0.7 Vp-p a) Color 0, 0 : 0 Vp-p b) Color 7, 0 : 0.467 Vp-p c) Color 15, 0 : 0.7 Vp-p

2) Input Impedance : 75 Ω

3) Video Color : R, G, B Analog

4) Signal Format : Refer to the Timing Chart

2-3. Signal Connector

15-pin D-Sub Connector (Attached Type)

2-4. Scanning Frequency

Horizontal : 30 ~ 70 kHz Vertical : 50 ~ 160 Hz

3. POWER SUPPLY

3-1. Power Range

AC 100~240V (Free Voltage), 50/60Hz, 2.0A Max.

3-2. Power Consumption

4. DISPLAY AREA

4-1. Active Video Area :

• Max Image Size - 326.7 x 245.5 mm (12.86" x 9.67")

• Preset Image Size - 310 x 230 mm (12.20" x 9.06") 4-2. Display Color : Full Colors 4-3. Display Resolution : 1280 x 1024 / 60Hz

(Non-Interlace)

4-4. Video Bandwidth : 110 MHz

5. ENVIRONMENT

5-1. Operating Temperature: 15°C ~ 30°C (59°F ~ 86°F)

(Ambient)

5-2. Relative Humidity : 8%~ 80%

(Non-condensing)

5-3. Altitude : 5,000 m

6. DIMENSIONS (with TILT/SWIVEL)

Width : 410 mm (16.14 inch) Depth : 440 mm (17.32 inch) Height : 432 mm (17.01 inch)

7. WEIGHT (with TILT/SWIVEL)

Net Weight : 15.5 kg (34.18 lbs.) Gross Weight : 18.5 kg (40.79 lbs.)

- 2 -

SPECIFICATIONS

MODE

NORMAL (ON)

STAND-BY

SUSPEND

OFF

H/V SYNC

ON/ON OFF/ON ON/OFF

OFF/OFF

POWER CONSUMPTION

less than 105 W less than 15 W less than 15 W less than 5 W

LED COLOR

GREEN

ORANGE

TIMING CHART

- 4 -

VIDEO

SYNC

C

E

D

F

AB

MODE

Resolution

Recall

H O R

I Z O N T A L

V E

R

T

I C A

L

kHz

µs µs µs µs µs µs

Hz ms ms ms ms ms ms

MODE 2

+

46.88

21.33

16.16

5.17

0.32

1.62

3.23 +

75.01

13.331

12.798

0.533

0.021

0.064

0.448

800

x

600

75Hz

Yes

MODE 1

—

37.50

26.67

20.32

6.35

0.51

2.03

3.81 —

74.99

13.335

12.802

0.533

0.026

0.080

0.427

640

x

480

75Hz

Yes

MODE 3

+

53.68

18.63

14.22

4.41

0.57

1.14

2.70 +

85.07

11.775

11.178

0.577

0.018

0.056

0.503

800

x

600

85Hz

Yes

MODE 4

+

68.677

14.561

10.836

3.725

0.508

1.016

2.201 +

85.00

11.764

11.182

0.582

0.014

0.044

0.524

1024

x

768

85Hz

Yes

MODE 5

—

31.47

31.78

25.42

6.36

0.64

3.81

1.91 +

70.08

14.269

12.712

1.557

0.414 0063

1.080

640

x

400

70Hz

Yes

MODE 6

—

31.47

31.78

25.42

6.36

0.64

3.81

1.91 —

59.94

16.684

15.254

1.430

0.318

0.063

1.049

640

x

480

59Hz

Yes

MODE 7

+

37.88

26.40

20.00

6.40

1.00

3.20

2.20 +

60.32

16.579

15.840

0.739

0.026

0.106

0.607

800

x

600

60Hz

Yes

MODE 8

—

43.269

23.112

17.778

5.334

1.556

2.222 —

85.008

11.764

11.093

0.670

0.023

0.069

0.578

640

x

480

85Hz

Yes

MODE 9

—

49.75

20.10

14.52

5.58

0.55

1.12

3.91 —

74.95

13.407

12.542

0.865

0.021

0.060

0.784

832

x

624

75Hz

Yes

MODE 10

+

60.02

16.66

13.00

3.66

0.20

1.22

2.24 +

75.03

13.328

12.795

0.533

0.017

0.050

0.466

1024

x

768

75Hz

Yes

MODE 11

+

63.98

15.63

11.85

3.78

0.44

1.04

2.30 +

60.02

16.661

16.005

0.656

0.015

0.047

0.594

1280

x

1024

60Hz

Yes

MARK

E A B C

D F

E A B C

D F

Sync Polarity

Frequency

Total Period

Video Active Time

Blanking Time

Front Porch

Sync Duration

Back Porch

Sync Polarity

Frequency

Total Period

Video Active Time

Blanking Time

Front Porch

Sync Duration

Back Porch

FACTORY PRESET MODE

* Mode 1~Mode 4: Basic Mode (Mode 5~Mode 11: Default Mode)

CONTROL LOCATIONS

- 8 -

MAIN

FBT

CONTROL

1

2

3

4

5

7

8

9

6

NO.

1

2

3

4

5

Ref. No.

SW207

SW205

SW206

SW204

SW202

NO.

6

7

8

9

Ref. No.

SW203

SW201

VR101

VR901

Control Function

POWER BUTTON

OSD SELECT/ADJUSTMENT(DOWN)

OSD SELECT/ADJUSTMENT(RIGHT)

SET BUTTON

OSD SELECT/ADJUSTMENT(LEFT)

Control Function

OSD SELECT/ADJUSTMENT(UP)

OSD BUTTON

TCO ADJUSTMENT

B+ADJUSTMENT

WIRING DIAGRAM

- 9 -

P201

P401

P102

P101

P501

WG2

P301

P302

P702

P402

P902

S

+

S

CDT

EARTH

P1

TO G2

Signal Cable

AC Socket

FBT

DISASSEMBLY

- 10 -

2. BACK COVER REMOVAL

1) Remove two screw caps (a).

2) Remove four screws (b).

3) Remove signal cable cap (c).

4) Slide the Back Cover away from the Front Cabinet of the monitor.

(a)

1. TILT/SWIVEL REMOVAL

1) Set the monitor face downward.

2) Pressing the latch (a), carefully remove the Tilt/Swivel by pulling it upward.

Anode Cap

DY Assembly Screw

P2

P101

P102

P902

P401

P701

P702

P402

P501

(c)

(b)

(c)

(a)

3. TOTAL CHASSIS ASSEMBLY REMOVAL

1)

Remove connector (a) from the DY Assembly screw.

2) Disconnect P2(CDT EATH) and four pins (b) from the Video PCB.

3) Carefully separate the CDT Board Assembly from the CDT neck.

4) Discharge the remaining static electricity by shorting between the Anode Cap and the CDT ground.

5) Disconnect the Anode Cap from the CDT.

6) Disconnect P902 (Degaussing pin), P701 (DY pin), P101, P102, P401, and P501 from

the Main PCB.

7) Remove two screws (c).

8) Remove the Total Chassis Assembly from the Main Frame.

(a)

(b)

(c)

(b)

- 11 -

4. CONTROL PCB ASSEMBLY REMOVAL

1) Remove two screws (a).

2) Remove the Control PCB Assembly from the Front Cabinet.

5. VIDEO PCB ASSEMBLY REMOVAL

1) Disconnect P301, P302 from the Video PCB.

2) Remove three screws (a).

3) Remove the Video PCB Assembly.

(a)

6. BOTTOM BRACKET REMOVAL

1) Remove six screws (a).

2) Remove the Bottom Bracket.

(a)

P301

P302

P702

P402

BLOCK DIAGRAM

- 12 -

POWER INPUT

100~240VAC

(50/60Hz)

Line

Filter

Degaussing

Circuit

OSD

ON/

OFF

SET

< OSD Control >

SMPS

TRANS

(T901)

SMPS

CONTROL

(IC901)

DPM

CONTROL

CIRCUIT

5V

Regulator

105V

50V 15V

6.3V

TILT

Control

Circuit

6.3V

15V

E

2

PROM

(IC402)

H / V POSITION

H / V SIZE

SPCC

TRAPIZODE

PIN BALANCE

PARALLELOGRAM

ROTATION

RECALL

DEGAUSS

DDC OPTION

COLOR CURVE

MOIRE

LANGUAGE

RECALL

VIDEO LEVEL

BRIGHTNESS CONTROL

OSD POSITION

5V

OSD IC

(IC301)

H-Sync Sig

V-Sync Sig

I

2

C DATA(SDA)

I

2

C CLOCK(SCL)

VIDEO

PRE-AMP

(IC302)

Signal

Cable

R

G

B

VIDEO

MAIN AMP

(IC303)

5V

H/V Sync Processor

( IC701 )

TDA4856

V-OUT

( IC601)

TDA4866

H-OUT

( Q706)

H-Linearity

Correction

Screen Control

Circuit

DC/DC Converter

X-RAY

Protection

Circuit

FBT

( T701 )

Dynamic

Focus

Circuit

Auto

Beam

Limit

Vertical Blanking,

Brightness Control

- 120V

40V

300V

600V

15V

D/D Feed Back

12V

MICOM

(IC401)

SCL / SDA

H/V Sync,

PWM Control

15V

6.3V

15V

105V

15V

50V

DY CDT

Heater ( 6.3V )

I

2

C

I

2

C

I

2

C

H/V

Sync

G

1

Screen

Dynamic Focus

Static Focus

H.V

R/G/B

Drive/Contrast

Cut-Off

H-DRV

B-DRV

B+

15V

POWER

TILT

COIL

DEGAUSSING

COIL

I

2

C

Vout 1

Vout 2