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

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

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)

(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)

(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)

(a)

(a)

6. BOTTOM BRACKET REMOVAL

1) Remove six screws (a).

2) Remove the Bottom Bracket.

(a)

(a)

(a)

(a)

(a)

(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

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

DESCRIPTION OF BLOCK DIAGRAM

- 13 -

1. Line Filter & Associated Circuit.

This is used for suppressing noise of power input line
flowing into the monitor and/or some noise generated in
this monitor flowing out through the power input line.
That is to say, this circuit prevents interference between
the monitor and other electric appliances.

2. Degauss Circuit & Coil.

The degauss circuit consists of the degaussing coil, the
PTC(Positive Temperature Coefficient) thermistor(TH901),
and the relay(RL901). This circuit eliminates abnormal
color of the screen automatically by degaussing the
shadow mask in the CRT during turning on the power
switch. When you need to degauss in using the monitor,
select DEGAUSS on the OSD menu.

3. SMPS(Switching Mode Power Supply).

This circuit is working of 90~264V AC(50/60Hz).
The operation procedure is as follows:

1) AC input voltage is rectified and smoothed by the
bridge diodes (D901~D904) and the capacitor (C908).

2) The rectified voltage(DC) is applied to the primary
coil of the transformer(T901).

3) The control IC(IC901) generates switching pulse to
turn on and off the primary coil of the transformer
(T901) repeatedly.

4) Depending on turn ratio of the transformer, the
secondary voltages appear at the secondary coils of
the transformer(T901).

5) These secondary voltages are rectified by each
diode(D941, D951, D961, D971) and operate other
circuit. (horizontal and vertical deflection, video
amplifier, ...etc.)

4. X-ray Protection.

I

f the high voltage of the FBT reaches up to 29kV (abnormal
state), Q807 operates and IC401(MICOM) pin 41 come to
low level. Then MICOM control IC701 (Deflection controller)
to stop Horizontal drive pulse and stop Horizontal Deflection.

5. Micom(Microprocessor) Circuit.

The operating procedure of Micom(Microprocessor) and its
associated circuit is as follows:

1) H and V sync signal is supplied from the signal cable.

2) The Micom(IC401) distinguishes polarity and
frequency of H and V sync.

3) The Micom sets operating mode and offers the
controlled data. (H-size, H-position, V-size, ... etc.)

4) The controlled data of each mode is stored in itself.

5) User can adjust screen condition by each OSD
function. The data of the adjusted condition is stored
in EEPROM(IC402).

6. Horizontal and Vertical Oscillation.

This circuit generates the horizontal pulse and the vertical
pulse by taking the H and V sync signal.
This circuit consists of the TDA4856(IC701) and the
associated circuit.

7. D/D(DC to DC) Converter.

This circuit supplies DC voltage to the horizontal deflection
output circuit by increasing DC 50V which is the
secondary voltage of the SMPS in accordance with the
input horizontal sync signal.

8. Side-Pincushion & Trapezoid Correction Cirucit.

This circuit improves the side-pincushion and the
trapezoid distortion of the screen by mixing parabola and
saw-tooth wave to output of the horizontal deflection D/D
converter which is used for the supply voltage(B+) of the
deflection circuit.

9. Horizontal Deflection Output Circuit.

This circuit makes the horizontal deflection by supplying
the saw-tooth current to the horizontal deflection yoke.

10. High Voltage Output & FBT(Flyback Transformer).

The high voltage output circuit is used for generating pulse
to the primary coil of the FBT(Flyback Transformer
(T701)). A boosted voltage(about 25.5kV) appears at the
secondary of the FBT and it is supplied to the anode,
focus, and screen voltage of the CRT.

11. H-Linearity Correction Circuit.

This circuit corrects the horizontal linearity for each
horizontal sync frequency.

12. Vertical Output Circuit.

This circuit takes the vertical ramp wave from the
TDA4856(IC701) and performs the vertical deflection by
supplying the saw-tooth current to the vertical deflection
yoke.

13. Dynamic Focus Output Circuit.

This circuit takes the horizontal and the vertical parabola
waves from the TDA4856(IC701) and amplifies it to
maintain constant focus on center and corners in the
screen.

- 14 -

14. H& V Blanking and Brightness Control.

Blanking circuit eliminates retrace line by supplying
negative pulse to the G1 of the CRT. And Brightness
circuit is used for control of the screen brightness by
changing DC level of the G1.

15. Image Rotation (Tilt) Circuit.

This circuit corrects the tilt of the screen by supplying the
image rotation signal to the tilt coil which is attached near
the deflection yoke of the CRT.

16. Video Pre-Amp Circuit.

This circuit amplifies the analog video signal from 0-0.7V
to 0-4V. It is operated by taking the clamp, R, G, B drive
and contrast signal from the Micom(IC401).

17. Video Output Amp Circuit.

This circuit amplifies the video signal which comes from
the video pre-amp circuit and amplified it to applied the
CRT cathode.

ADJUSTMENT

- 15 -

GENERAL INFORMATION

All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several adjustments may be required.
Adjustment should be following procedure and after
warming up for a minimum of 30 minutes.

• Alignment appliances and tools.

- IBM compatible PC.

- Programmable Signal Generator.

(eg. VG-819 made by Astrodesign Co.)

- EPROM or EEPROM with saved each mode data.

- Alignment Adaptor and Software.

- Digital Voltmeter.

- White Balance Meter.

- Luminance Meter.

- High-voltage Meter.

AUTOMATIC AND MANUAL DEGAUSSING

The degaussing coil is mounted around the CDT so that
automatic degaussing when turn on the monitor. But a
monitor is moved or faced in a different direction, become
poor color purity cause of CDT magnetized, then

press

DEGAUSS on the OSD menu.

ADJUSTMENT PROCEDURE & METHOD

-Install the cable for adjustment such as Figure 1and run

the alignment program on the DOS for IBM compatible PC.

-Set external Brightness and Contrast volume to max position.

1. Adjustment for B+ Voltage.

1) Display cross hatch pattern at Mode 4.

2) Adjust voltage to 51V

±

0.5Vdc with VR901.

2. Adjustment for High-Voltage.

1) Run alignment program for StudioWorks 775E/
775N, CB775C on the IBM compatible PC.

2) Display cross hatch pattern at Mode 4.

3) DIST.ADJ→CTRL PWM → High Voltage Command.

4) Adjust High Voltage to 25.5kV

±

0.1 kVdc.

5) Press Enter Key.

3. Adjustment for Factory Mode (Preset Mode).

1) Display cross hatch pattern at Mode 1.

2) Run alignment program for StudioWorks 775E/,
775N, CB775C on the IBM compatible PC.

3) Power button of the monitor turn off → turn on.

4) COMMAND → START → Y(Yes) command.

5) DIST. ADJ. → CTRL PWM → TILT command.

6) Adjust tilt as arrow keys to be the best condition.

7) DIST. ADJ. → BALANCE command.

8) Adjust balance of side-pincushion as arrow keys to
be the best condition.

9) DIST. ADJ. → BALANCE command.

10)

Adjust parallelogram as arrow keys to be the best
condition.

11)

DIST. ADJ. → FOS. ADJ command.

12)

Adjust V-SIZE as arrow keys to 230

±

2mm.

13)

Adjust V-POSITION as arrow keys to center of the
screen.

14)

Adjust H-SIZE as arrow keys to 310±2mm.

15)

Adjust H-POSITION as arrow keys to center of the
screen.

16)

Adjust S-PCC (Side-Pincushion) as arrow keys to be
the best condition.

17)

Adjust TRAPEZOID as arrow keys to be the best
condition.

18)

Display from Mode 1 to Mode 4 and repeat above
from number

12)

to

17)

.

19)

PRESET EXIT → Y (Yes) command.

4. Adjustment for White Balance and Luminance.

1) Set the White Balance Meter.

2) Press the DEGAUSS on the OSD menu for
demagnetization of the CDT.

3) COLOR ADJ. → LUMINANCE command of the
alignment program.

4) Set Brightness and Contrast to Max and ABL to
200(C8) (decimal) position.

5) Display color 0,0 pattern at Mode 4.

6) COLOR ADJ. → BIAS ADJ. command of the
alignment program.

7) Check whether green color or not at R-BIAS and B­BIAS to min position and G-BIAS to 127(7F) to
position. Set Sub-Brightness to 70(Decimal). Adjust
G2(Screen) command to 0.4

±

0.05FL of the raster

luminance. Check it's not green color.

8) Adjust R-BIAS and B-BIAS command to x=0.283

±

0.005 and y=0.298±0.005 on the White Balance
Meter with PC arrow keys.

9)

Adjust SUB-Brightnesscommand to 0.4±0.1FL of the
raster luminance.

10)

PRESET EXIT → Y (Yes) command.

11)

Display color 15,0 box pattern (70x70mm) at Mode 4.

12)

DRIVE ADJ command.

13)

Set SUB-Contrast 70(46) (decimal) position.

14)

Set G-DRIVE to 150(96) (decimal) at DRIVE of the
alignment program.

- 16 -

Figure 1. Cable Connection

15)

Adjust R-DRIVE and B-DRIVE command to white
balance x=0.283

±

0.005 and y=0.298±0.005 on the

White Balance Meter with PC arrow keys.

16)

Adjust SUB-CONTRAST command to 54±2FL of the
color 15,0 box pattern (70x70mm) luminance at
mode 4 and save in color 1.

17)

PRESET EXIT → Y (Yes) command.

18)

Display color 15,0 full white patten at Mode 4.

19)

COLOR ADJ. → LUMINANCE → ABL command.

20)

Adjust ABL to 34±1FL of the luminance.

21)

Exit from the program.

5. Adjustment for Focus.

1) Set the Brightness and Contrast to max position.

2) Display H character in full screen at Mode 4.

3) Adjust two Focus control on the FBT that focus
should be the best condition.

220

Monitor to be

adjusted

Video
Signal
Generator

IBM
Compatible PC

Parallel Port

Power inlet (required)

Power LED

ST Switch

Power Select Switch
(110V/220V)

Control Line

Not used

RS232C

PARALLEL

V-SYNC

POWER

ST

VGS

MONITOR

E

E

V-Sync On/Off Switch
(Switch must be ON.)

F

F

A

A

B

B

C

C

15

10

5

5

69

1

1

1

14

13

25

6

5V

5V

5V

4.7K

4.7K

4.7K

74LS06

74LS06

OFF ON

OFF

ON

11

TROUBLESHOOTING GUIDE

- 17 -

NO POWER

(POWER INDICATOR OFF)

TROUBLE IN
D901, D902, D903, D904

TROUBLE IN FUSE
(F901)

TROUBLE IN
IC901

TROUBLE IN
D941, D951, D961,
D971

TROUBLE IN

IC950, Q972, Q971,

Q952, Q951, Q942, Q941

CHECK

FUSE OK?

CHECK

C908 VOLTAGE?
(AC120V: 160VDC,
AC220V: 304VDC)

NO

YES

YES

YES

YES

NO

NO

NO

CHECK

IC901 PIN 6

WAVEFORM

(SQUARE WAVE

COMES OUT?)

CHECK

D941, D951, D961,

D971

VOLTAGE?

1. NO POWER

- 18 -

2. NO CHARACTER

NO CHARACTER

CHECK

IC302

PIN 20(6.3V) ?

CHECK

IC302 PIN 1, 3, 5?

CHECK

IC302 PIN 14, 16, 18 ?

CHECK

IC303

PIN 1, 5, 11 ?

CHECK

IC303 PIN 4 (105V)

PIN 8 (15V) ?

TROUBLE IN
P302 6.3V LINE

TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE

TROUBLE IN
IC302

TROUBLE IN
P303 15V LINE/
105V LINE

TROUBLE IN IC303

NO

YES

NO

NO

YES

YES

YES

YES

NO

NO

CHECK

R, G, B CATHODE

VOLTAGE?

TROUBLE IN
R341~R343,
R351~R353, L301~L303,
D307~D312

TROUBLE IN

CRT SOCKET

YES

NO

- 19 -

NO VIDEO

(POWER INDICATOR ON)

CHECK

POWER INDICATOR

GREEN or ORANGE?

CHECK

D712 ANODE

(-120V)?

CHECK

G1VOLTAGE?

(

-35~-15V)

TROUBLE IN
D712

TROUBLE IN
Q704

DPM MODE
(NO H and/or V SYNC)

ORANGE

NO

GREEN

YES

NO

3. NO RASTER

CHECK

CDT HEAT

VOLTAGE? (6.3V)

TROUBLE IN
D941, Q942, Q941

YES

NO

TROUBLE IN

CDT

YES

- 20 -

4. NO HORIZONTAL DEFLECTION

NO H-DEFLECTION

(ONE VERTICAL LINE)

CHECK

Q706?

CHECK

B+ VOLTAGE

(50V)?

CHECK

T701(FBT) PIN 2

(31KHZ 70V,

69KHZ 143V) ?

CHECK

Q705 COLLECTOR

WAVEFORM?

TROUBLE IN
Q706

TROUBLE IN
50V LINE

TROUBLE IN
Q719, Q720, D710

TROUBLE IN
Q705

TROUBLE IN
T701, P701

NO

NO

YES

YES

YES

YES

NO

NO

- 21 -

5. TROUBLE IN H-LINEARITY

UNBALANCED OF H-LIN.

CHECK

IC401

PIN 22, 23, 24 ?

CHECK

Q711~Q716?

CHECK

L703?

TROUBLE IN
IC401 (MICOM)

TROUBLE IN
Q711 ~ Q716

TROUBLE IN
L703

TROUBLE IN
C722, C723, C726, C729

NO

NO

NO

YES

YES

YES

Cs SIGNAL TABLE

HORIZONTAK
FREQUENCY(fH)

29K ~ 35.9K
36K ~ 38.9K
39K ~ 47.9K
48K ~ 64.9K
65K ~ 71K

Cs1

L
L
L
L

H

Cs3

L

L
H
H
H

Cs2

L

H

L
H
H

- 22 -

6. NO VERTICAL DEFLECTION

NO V-DEFLECTION

(ONE HORIZONTAL LINE)

CHECK

IC601 PIN 3

(15V)?

CHECK

IC601 PIN 7

(40V)?

CHECK

IC701 PIN 12, 13?

TROUBLE IN
R603 15V LINE

TROUBLE IN
HIGH-VOLTAGE OUT
CIRCUIT(FBT),
D721, R606

TROUBLE IN
IC701

TROUBLE IN
IC601, V-CIRCUIT

NO

NO

YES

YES

YES

NO

3V

- 23 -

TROUBLE IN
OSD PERIPHERAL
CIRCUIT

NO OSD

TROUBLE IN
5V LINE

TROUBLE IN
IC601 PIN8 (V-FBP),
T701 40V LINE (H-FBP)

TROUBLE IN
IC302, IC301

TROUBLE IN
IC301, IC302

NO

YES

DC 5V

YES

YES

YES

NO

NO

NO

Pin 5

5V

Pin 10

5V

H+V

5V

H+V

CHECK

IC301 B

+

?

CHECK

IC311 PIN 12

WAVEFORM ?

(ENTER BUTTON MUST BE PRESSED.)

7. TROUBLE IN OSD

CHECK

IC301 PIN 5, 10

WAVEFORM?

CHECK

IC301 PIN 13, 14, 15 ?

- 24 -

CHECK

IC401 (MICOM)

PIN 1, 42 (H/V INPUT)

SIGNAL?

CHECK

IC401 PIN 6

WAVEFORM?

CHECK

IC401 (MICOM)

PIN 3, 4 ?

CHECK

B+LINE

(6.3V,15V, 105V) ?

CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)

TROUBLE IN
X401

TROUBLE IN
IC401 (MICOM)

TROUBLE IN
Q941, Q942, Q951, Q952,
Q971, Q972

TROUBLE IN PC

OFF MODE FAILURE

INPUT H/V SYNC SIGNAL

H/V SYNC

(NO OFF MODE.)

NO

NO

NO

NO (DPMF: 0V)

DPM TABLE

Mode

Item

NORMAL

STAND-BY

SUSPEND

OFF

DPMF

H
H
H
L

LED

GREEN
ORANGE
ORANGE
ORANGE

DPMS

H

L
L
L

YES

YES

SEE DPM TABLE

YES

YES

5V

24MHz

8. TROUBLE IN DPM

- 25 -

CHECK

IC401 PIN 31

(0V)?

CHECK

Q953 COLLECTOR

VOLTAGE?

CHECK

P902 ?

CHECK
RL901?

TROUBLE IN
IC401 (MICOM)

TROUBLE IN
Q953

TROUBLE IN
P902

TROUBLE IN
RL901

TROUBLE IN
TH901,
DEGAUSSING COIL

NO DEGAUSSING

DC 15V

NO

NO

NO

NO

YES

YES

YES

YES

(DEGAUSS ON THE OSD MENU MUST BE PRESSED.)

9. NO DEGAUSSING

- 26 -

10. NO TILT (NO ROTATION)

NO TILT (NO ROTATION)

TROUBLE IN
IC401 (

MICOM)

TROUBLE IN
15V LINE, 6.3V LINE

TROUBLE IN
Q501~Q503

TROUBLE IN
P501, TILT COIL, D501

NO

YES

YES

YES

CHECK

15V LINE

AND 6.3V LINE ?

CHECK

Q503 EMITTER

VOLTAGE ?

NO

NO

CHECK

Q504(COLLECTOR)

WAVE FORM ?

12V

EXPLODED VIEW

1

7

8

9

19

16

18

17

15-1

15-2

B

C

A

11

10

12

13

14

2

3

4

6

5

EXPLODED VIEW PARTS LIST

Ref. No.

1

2

3
4
5
6
7
8

9
10
11
12
13
14

15-1
15-2

16

17

18

19

A

B

C

Description

CABINET ASSY KCB775 BRAND C026 303G FOR S/W 775N (CB775C-NA)
CABINET ASSY KCB775C BRAND C026 FOR S/W 775E (CB775C-EA)
CDT SET, M41LFQ803X 46NLAA FOR NORTHERN HEMISPHERE
CDT SET, M41LFQ803X 46SLAA FOR SOUTHERN HEMISPHERE
CDT SET, M41LFQ803X 46RLAA FOR EQUATORIAL
SCREW ASSY PHP+5*20(FZMY)+GW18 NEW TYPE #CDT FIX
CONNECTOR ASSY, 1P W-T 520MM UL 1015 AWG 22 CB775C
CDT EARTH, CB775C TIN WIRE BRAID(128)
COIL,DEGAUSSING, 1090MM 14.3 OHM 0.45MM 120T 17"
FBT (FLY BACK TRANSFORMER), FMMTC71-M1031E MNT (LIM SANG IL)
SOCKET (CIRC),POWER BCP-03A-3 BAE EUN AC UNIVERSAL 3PIN BLACK
PWB(PCB) ASSY,SUB KCB775C JLJMT BRAND CONTROL TOTAL
BRACKET, CB775C GUIDE 303S,LEFT
BRACKET, CB775C GUIDE 303S
METAL SHIELD BOTTOM KCB775C (PEM NUT) CKD
SCREW, PTP+4*20BP(MSWR/FZMY)
BRACKET, CB775 HOLDER PCB
COVER CB775 SCREW (RIGHT)
COVER CB775 SCREW (LEFT)
SCREW, PTP+4*20BP(MSWR/FZMY)
BACK COVER ASSY, KCB775 C015 "A"CORE,303G,85964 FOR S/W 775N (CB775C-NA)
BACK COVER ASSY, KCB775 C015 "A"CORE,PC+ABS,85964 FOR S/W 775E (CB775C-EA)
COVER CB775 PIECE REAR
TILT SWIVEL ASSY, KCB775 T030,B027 60HR,85964 FOR S/W 775N (CB775C-NA)
TILT SWIVEL ASSY, KCB775 LOCAL 60HR,85964

FOR S/W 775E (CB775C-EA)

MAIN TOTAL ASSY, KCB775C BRAND CA-80

FOR S/W 775E (CB775C-EA)

MAIN TOTAL ASSY, KCB775C BRAND CA-80 FOR S/W 775N (CB775C-NA)_AUSTRALIA
MAIN TOTAL ASSY, KCB775C BRAND CA-80

FOR S/W 775N (CB775C-NA)

PWB(PCB) ASSY,VIDEO, KCB775C XLTET BRAND TCO99 TOTAL FOR S/W 775N (CB775C-NA)
PWB(PCB) ASSY,VIDEO, KCB775C JLJMT BRAND VIDEO TOTAL

FOR S/W 775E (CB775C-EA)

PWB(PCB) ASSY,MAIN, KCB775C XLTET BRAND CA-80

FOR S/W 775E (CB775C-EA)

PWB(PCB) ASSY,MAIN, KCB775C HLAMD BRAND CA-80 FOR S/W 775N (CB775C-NA) _

AUSTRALIA

PWB(PCB) ASSY,MAIN, KCB775C JLJMT BRAND CA-80

FOR S/W 775N (CB775C-NA)

Part No.

3091TKC029K
3091TKC029X
2423GC0B89Z
2423GC0B88G
2423GC0B88H

339-002H
6631T11005D
6868T17004E
6140TC3001A

6174Z-1031E
6620TKB002A
6871TST160B
4810TKK126A
4810TKK125A
4950TKS150D

332-102F
4810TKK084A
3550TKK055A
3550TKK055B

332-102F
3809TKC014C
3809TKC014D
3550TKK056A
3043TKK036C
3043TKK036D

3313T17041C
3313T17041G
3313T17041B
6871TVT162C
6871TVT162B
6871TMT162C
6871TMT162G
6871TMT162B

3.40V

85.2V

1.88V

15.6V

50.4V