Daewoo 14CB1T User Manual

Service Manual

42" PLASMA PDP MONITOR

CHASSIS : E1

SEP. 2005

DAEWOO ELECTRONICS Corp.

http : //svc.dwe .co.kr

14CB1T

TELEVISIÓN DE TUBO 14"

CONTENTS PAGE

o Safety Instructions 2
o Technical Specifications 3
o Remote Control 4
o Preperations 5
o Operating Your TV 6
o Block Diagram 10
o IC Specs 11
o Pin Voltages of IC’s 18
o OSCILLOSGRAPHS OF SOME IC PINS 19
o Electrical Adjustments 22
o Channel Frequency Tables 25
o Spare Part List 27

1

1. SAFETY INSTRUCTIONS .

GENERAL GUIDELINES

1. It is advised to insert an isolation transformer
in the AC supply before servicing a hot
chassis.

2. Potentials as high as 33KV are present when
this receiver is in operation. Operation of the
receiver without the rear cover involves the
danger of a shock hazard from the receiver
power supply. Servicing should not be
attempted by any one who is not competent
with the precautions necessary when working
on the high voltage equipment. Always
discharge the anode of the tube.

3. When servicing observe the original lead
dress in the high voltage circuits. If a short
circuit is found, replace all the parts which
have been overheated or damaged by the
short circuit.

4. Always use the manufacturer’s replacement
safety components. The critical safety

components marked with

on the
schematics diagrams should not be replaced
by other substitutes. Other substitute may
create the electrical shock, fire or other
hazards. Take attention to replace the
spacers with the originals. Furthermore where
a short circuit has occurred, replace those
components that indicate evidence of
overheating.

5. After servicing, see that all the protective
devices such as insulation barriers, insulation
papers, shields and isolation R-C
combinations are correctly installed.

6. When the receiver is not being used for a
long time of period of time, unplug the
power cord from the AC outlet.

7. After servicing make the following leakage
current checks to prevent the customer from
being exposed to shock hazard.

LEAKAGE CURRENT COLD CHECK

1. Unplug the AC cord and connect a jumper
between the two prongs of the plug.

2. Turn the receiver’s power switch on.

3. Measure the resistance value with an
ohmmeter, between the jumpered AC plug
and each exposed metallic cabinet part on

Figure 1

X-RAY RADIATION WARNING

The primary source of X-ray radiation in this receiver
is the picture tube. The chassis is specially
constructed to limit X-ray radiation. For continued X­ray radiation protection, replace the tube with the
same type of the original one.

CAUTION
AFTER REMOVAL OF THE ANODE CAP, DISCHARGE THE
ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO
THE METAL CHASSIS, CRT SHIELD, OR THE CARBON
PAINTED ON THE CRT WITH A HIGH VOLTAGE PROBE

the receiver, such as screw heads, aerials,
connectors, control shafts etc. When the
exposed metallic part a return path to the
chassis the reading should be between
4Mohm and the 20Mohm. When the exposed
metal does not have a return path to the
chassis, the reading must be infinite.

LEAKAGE CURRENT HOT CHECK

1. Plug the AC cord directly in to the AC outlet.
Do not use an isolation transformer for this
check.

2. Connect a 2Kohm 10W resistor in series with
an exposed metallic part on the receiver and
an earth, such as a water pipe.

3. Use an AC voltmeter with high impedance to
measure the potential across the resistor.

4. Check each exposed metallic part and
check the voltage at the each point.

5. Reverse the AC plug at the outlet and repeat
each of the above measurements.

6. The potential at the any point should not
exceed 1.4 Vrms. In case a measurement is
outside the limits specified, there is the
possibility of a shock hazard, and the receiver
should be repaired and rechecked before it
is returned to the customer.

HOT CHECK CIRCUIT

TO INSTRUMENTS

EXPOSED

METALLIC PARTS

AC-Voltmeter

Water pipe
(earth)

2 K Ohm

2

AND MULTIMETER (SELECT VDC) AND THEN SHORT CIRCUIT DIRECTLY TO DISCHARGE COMPLETELY

2. TECHNICAL SPECIFICATIONS .

Power source: 220-240V AC, 50-60Hz

Power consumption (nom.) : 40 W 14”

50 W 20”, 21”

Standby power consumption : 4 W

Aerial impedance : 75Ohm, coaxial type

Receiving system

PAL SECAM BG
PAL SECAM BG DK
PAL I

Receiving channels: VHF BAND I CH2-4
VHF BAND III CH5-12
CABLE TV S1-41
UHF BAND CH21-69

Audio outputs : 2.0W RMS at %10 THD 14”

High Voltage : 23 ± 0.5 KV 14”

25 ± 0.5 KV 20”, 21”

Focus voltage : %25.6 ± %38 of EHT

Grid 2 voltage : 0-1400 V

Heater voltage : 6.2 ± 0.2 Vrms

Video/Audio Terminals : AV1 IN Video : 1 Vpp,75 Ohm

Audio : 0.5 Vrms, >10 Kohm
RGB
AV1OUT Video : 1 Vpp, 75 Ohm
Audio : 0.5 Vrms, <1 Kohm
AV2 IN (RCA, optional) Video : 1 Vpp, 75 Ohm
Audio : 0.5 Vrms, >10 Kohm

Operating temperature : 0-45 Degrees

Safety : IEC 65 /BS P2N

X-Ray radiation : ACC. IEC 65/BS P2N

1

: TV set is produced to receive “one” of these colour and sound systems.

1

: PAL BG

2.5W RMS at %10 THD 20”, 21”

3

3. REMOTE CONTROL .

1. MUTE button

2. Ten key program button

3. Two digit program button (-/--)

4. MENU button

5. Program up button

6. Volume decrease button

7. Return to selected programme button (SWAP)

8. Information button (i)

9. STAND-BY button

10. AV-TV selection button

11. OK button

12. Volume increase button

13. Program down button

14. 16:9 picture format button

15. Sleep timer button

16. Normalization button

For Teletext Function (Opt.)

1. Yellow fastext button

2. Blue fastext button

3. Teletext/TV select button

4. Enlarge button

5. UPDATE button

6. MIX button

7. Green fastext button

8. Red fastext button

9. STOP button

10. SUB-PAGE button

11. REVEAL button

Special features

• Automatic Programming

• 100 Programme Memory

• Available for Cable Channels (A decoder may be

required)

• Manual Fine Tuning

• Skipping back to the last channel you have

started to zapp via only one button(SWAP).

• 16:9 picture format

• Scart Socket: Video cassette recorder, satellite

receiver, video disc player, DVD, TV games or a
home computer can be connected to this AV
socket with an appropriate connecting cable.

• Normalization system to recall the setting in
memory after the colour, contrast, brightness
setting have been changed.

• Automatic Volume Limiting.

• Infrared Remote Control.

• Your TV will automatically switch off if it’s been

programmed from 15 to 120 minutes.

• Automatically switch to Stand by five minutes
after a channel ceases to transmit.

• Multi language menu system

• Naming the channels (Automatic with ATS).

• NTSC playback.

• S-VHS via Scart.

• ATS: Automatic Tuning System with country

selection (*).

• Audio/Video RCA sockets (*).

• Headphone socket (*).

• Teletext reception (*).

• Zapping (*).

• I.P.S.: Intelligent Programme Switch: You can set

your TV to skip to a specific

• Channel at a specific time. It works also as an
alarm function (*).

• Childlock (*).

• Please Note: Zapping, I.P.S., Childlock are

optional if ATS exists.

(*): These features are not available in all models.

4

4. PREPARATIONS .

MAIN SUPPLY CONNECTIONS

Connect the TV mains plug into your domestic mains
socket outlet (230 V 50Hz AC).
Press the Program up, Program down button or
Numeric Buttons on the remote handset to switch
the TV on.

AERIAL CONNECTION

Using a 75Ω aerial lead connect your TV to the
aerial outlet in your home.

BATTERY FITTING

Insert the 2 AAA Batteries supplied into the
compartment on the rear of the remote control,
ensure you follow the polarity diagram inside
the compartment.

4

4

PIN CONNECTIONS FOR SCART SOCKET

1-

Audio output Right 11- RGB input, Green
2- Audio input Right 12-
3- Audio output Left(Mono)13- Red ground
4- Audio ground 14- Ground
5- Blue ground 15- RGB input, Red
6- Audio input Left(Mono) 16- Blanking Signal
7- RGB input, Blue 17- Video output ground
8- Switching voltage 18- Video input ground
9- Green ground 19- Video output
10- 20- Video input
21- Screening

CONNECTING TV WITH VIDEO AND SATELLITE/DIGITALRECEIVER

5

5. OPERATING YOUR TV .

A. ZAPP FUNCTİON (OPTİONAL)

Select the programme you would like to recall
by pressing SWAP button. Selected programme
number will appear on the upper left side of the

screen. Watching any
programme, you can recall the
selected one by pressing SWAP
button again. If you press SWAP

button again, you can recall the
last programme you
watched. You can cancel ZAPP function by
pressing INFO button.

D. TUNING THE TELEVISION

There are two ways of tuning your television:

• Manual, where you control the tuning process
or Autoprogram where the television does it all
automatically.

• The TV sets equipped with ATS (Automatic
Tuning System) sorts the channels regarding
the broadcasting system of your country
(optionally).

Please Note
If the TV is set to a channel with no signal the
TV will return to standby after 5 minutes. The
time remaining is displayed on the screen.

B. SWAP FUNCTION

Allows you to swap between the program you

are watching and the
last selected program. i.e. If you

Manual Tuning

Tuning the TV is accessed through the SETUP
menu.

To access the SETUP menu:

Press the MENU button twice. SETUP Menu
will appear.

were watching Program 1 and
change to Program 11, press the
SWAP button to go back to

Program 1. Press it again to return to Program

11.

Note: If Zapping function is available SWAP
function will not work.

a) If you don’t know the channel

C. INFO

By pressing the “WHITE (i)” button the

programme number and programme
name (if it is exist) will appear on the
screen. This will disappear
automatically after a few seconds.

number (Tuning with SEARCH
function).

Enter the SETUP menu by pressing MENU
button twice.

In the SETUP Menu select
PROGRAM NO and change to P1
using the Program down button to
select it and the Volume up or
Volume down button to change it.

6

Starting with Program P1, tune in the first
channel as follows:

Use the Program up button to select
SEARCH.Press the Volume up or
Volume down button to start the
tuning search. The search arrow will
appear. When the search finds a
strong searching. The picture will
appear, channel signal it will stop.

Identify which channel you are
watching (BBC 1, ITV 1 etc.) and decide which
program number you want it to be.

Use the Program down button to

select PROGRAM NO.

Use the Volume up/down buttons to

select the program number.

Use the Program down button to

select STORE. Press the OK button

and STORED will appear on the

STORE line.

You have now stored the first

channel.

Use the Program up button to select

again SEARCH and continue the

tuning procedure until you have
tuned in all the programmes you want or the
television can receive.

b) If you know the channel number. (Tuning
with channel numbers)

Press the OK button to select “S” for

cable channels and “C” for terrestrial

broadcast.

Use Volume up/down button to

select the channel number or enter

the channel number using the

Numeric buttons.

Use the Program down button to

select PROGRAM NO.

Enter the desired program number
by using the Ten key program
buttons
Use the Volume up/down buttons to
select the program number.

Use the Program down button to
select STORE. Press the OK button
and STORED will appear
on the STORE line. The channel will
be stored with the program number
you desired.

You have now stored the first
channel.
Use the Program up button to select
again CHANNEL and continue the
tuning procedure until you have
tuned in all the programmes you
want or the television can receive.

To exit the SETUP menu press the
TXT button.

Please note

The system will displayed automatically on
SYSTEM row i.e.BG, L, I, DK depending the
receiving broadcasting system of the country. In
some countries the broadcasting system can be
both in BG/DK or BG/LL´.Only the TV sets
produced with Pal Secam BG/DK or Pal Secam
BG/LL´ systems can receive both BG/DK or
BG/LL´ broadcasts.

Please note

If you do not press any buttons for 15 seconds
the TV will exit the menu system.

Automatic Tuning (Autoprogram)

Enter the SETUP menu as before.

7

Use the Program down button to
select AUTOPROGRAM and press
the OK button.

Please Note:

a) On the TV sets equipped with ATS a

COUNTRY SELECTION menu will appear.

Select the desired country using Program and
Volume buttons.

Press the OK button to select the country and
press the OK button again the Automatic Tuning
System regarding the broadcasting system in
the desired country.

b) On the TV sets without ATS pressing the OK
button starts AUTOPROGRAM.

When you are sure the aerial is

connected properly press the OK

button and to confirm it press OK

button again.

To cancel Autoprogram whilst it is

working press the Menu button. As

Autoprogram stores a channel it will

appear briefly on the screen.

Your TV is now tuned and ready to use

E. TV SET UP

The TV set up is accessed through a menu
system.

Once you have stored your set up, this is the
set up the TV will default to when you switch it
on.

Please note

If you do not press any buttons for 18-19
seconds the TV will exit the menu system.

There are three menus;

• Picture Menu

• Setup Menu

• Features Menu

• Picture Menu

To reach the picture menu press one time
to MENU button.
BRIGHTNESS
CONTRAST
COLOUR
SHARPNESS

To change, for example, the colour,
select it using Program down
buttons.

Use the Volume up and Volume
down buttons to change the setting.

To save your settings, select STORE
and press the OK button. STORED
will be displayed.

Note:

If you play NTSC formatted tape from the scart,
the TINT menu will appear to adjust the TINT
level.

• Set up Menu

Set up menu is explained above, under “Tuning
the Television” topic

• Features Menu

To reach the feature menu press three times to
MENU button.

a) Sleep Timer

The sleep timer automatically switches the set
to stand-by after the preset time has elapsed.

You can select the time from 15 to 120 minutes
with 15 minutes steps.

There are two ways to set the sleep timer;

8

1- Select the SLEEP TIMER in the FEATURES
menu. Select the desired time by using Volume
down or Volume up buttons.
2- You can also use the YELLOW ( ) button on
your remote control to select this function. You
can increase the switch off time interval by
pressing this button repeatedly.

Notes:
The last 60 seconds of the desired switch off
time by counting from 59 down. When this time
interval has elapsed the set will switch to
STAND-BY.
To view the remaining sleep time, press
YELLOW ( ) button. To cancel the sleep time
select OFF in SLEEP TIMER.

b) On Timer

You can select the on time between 30 minutes
to 12 hours by pressing numeric buttons or AV
button.

If TV is at Stand-by position, you can switch it
on at desired time and programme by activating
the ON TIMER feature.

To cancel the on time select off in ON TIMER.

c) AVL

TV transmitters have different sound levels.
AVL (automatic volume limiting) maintains the
same sound level as you switch from program
to program.

From the features menu you can select AVL
button by pressing Program down button.
To supply this press Volume up or down button
and select ON for AVL.

d) Language

There are many languages available for the On

Screen Displays (OSD).

In the features menu select
Language by program down button.

Press the OK button to select the language list.

Press the Program up/down or
Volume up/down buttons to page
through all the languages and OK to
select.

9

6. BLOCK DIAGRAM OF E1 CHASSIS .

A

V

T
U
O
A

POWER AMP.

IC 301 TDA 2822

AOUT

MUTE

44

10

H-OUT

107 V

DEFLECTION

HORIZONTAL

2SD2599

H-SYNC

IC 201

SWITCH

HEF 4053

SCART/FRONT AV

B

R

G

SCART

T703

T701, T702,

CRT MODULE

T706

T704, T705,

B

R

G

FBT

TR 501

EHT 45 V 12 V 8 V

AV SEL/C-VBS/AUD

88

5

51/52/53

TDA 9345

6/7

464847

Tvsignal

processor-

Teletextdecoder

24

23

IC 101

Controller

with embedded-

2

3

27

33

28

34

VGUARD

VDR B

VDR A

IC 501

TDA 8357

VERTICAL DEFL.

KEYBOARD IR RECEIVER

TUNER

AGC

SCL SDA IF1 IF1

IC 103

EEPROM

24CO8AN

AM OUT

10SI-2.7

IC 104

TDA 9830

AM DEMOD.

220V AC in

IC 601

TDA 16846

POWER SUPPLY

115 V 33 V 12.5 V 3.3 V 5 V

10