Daewoo DTB-21U6 Manuel utilisateur

Service Manual

Color Television

CHASSIS : CP-185F

MODEL : DTB-21U6

Specification

S/M No. : TCP185FEF0

Version Pal multi system

TV Standard PAL-SECAM B/G, D/K, H, I/I (NTSC : AV Only)

Sound system Mono

Power consumption 74W 10%

Test condition is max(control all max)

Speaker 3W 8 Ohm o 7.5W 8 Ohm

Teletext system Option

Aerial Input 75 Ohm unbalanced

Channel coverage Off-air channels, S-cable channels and hyperband

Tuning system Ferquency synthesiser tuning system

Visual screen size 21":51cm FLAT

Channel indication On screen display

Program selection 100 Programmes

RCA jack : Audio input and Vidio input

ERUO SCART Jack : Audio/Video and R/G/B input.

Auxiliary Outpup Terminal Sloe and fast swtching, SVHsin

Audio - Video jack on front of cabinet in common

connection with EURO-SCART

Headphone jack on front of cabinet

R-40A10 (None teletext) AAA Battery type

Remote control R-40A01(With teletext) AAA Battery type

R-44C05(With teletext) AA Battery type

DAEWOO ELECTRONICS CO., LTD

http://svc.dwe.co.kr Aug. 2002

✔

Caution

: In this Manual, some parts can be changed for improving, their

performance without notice in the parts list. So, if you need the

latest parts information,please refer to PPL(Parts Price List) in

Service Information Center (http://svc.dwe.co.kr).

SAFETY INSTRUCTION 2

SPECIFICATIONS 3

21 Pin EURO-SCART 3

CIRCUIT BLOCK DIAGRAM 4

ALIGNMENT INSTRUCTIONS 5

1. Microcontroller configuration : Service mode 5

2. Microcontroller configuration 5

3. TV SET Alignment 6

SCHEMATIC DIAGRAM 7

EXPLODED VIEW 8

PRINTED CIRCUIT BOARD 9

SERVICE PARTS LIST 10

FUNCTIONAL DESCRIPTION 1

IC DESCRIPTION 6

TABLE OF CONTENTS

APPENDIX (Appendix is provide only by internet [http://svc.dwe.co.kr])

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high

voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 22-23 kV (14")or

24-26 kV (20"-21")at max beam current. The high voltage must not, under any circumstances, exceed 27.5 kV (14",

20"), 29KV (21"). Each time a receiver requires servicing, the high voltage should be checked. It is important to use an

accurate and reliable high voltage meter.).

2.The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-RAY RADIATION

protection, the replacement tube must be exactly the same type tube as specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the receiver outside the cabinet or

with the back cover removed involves a shock hazard from the receiver.

1) Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when

working on high voltage equipment.

2) Discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated and if

broken, glass fragments will be violently expelled.

2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.

3. When replacing a high wattage resistor (oxide metal film resistor) in circuit board, keep the resistor body 10 mm away

from the circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 230 volts, 5O Hz. NEVER connect to a DC supply of any other voltage or

frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related characteristics. These characteristics

are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection afforded by them cannot

necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts

which have these spe- cial safety characteristics are identified in this manual and its supplements, electrical components

having such features are identified by designated symbol on the parts list. Before replacing any of these components,

read the parts list in this manual carefully. The use of substitutes replacement parts which do not have the same safety

characteristics as specified in the parts list may create X-RAY Radiation.

SAFETY INSTRUCTION

WARNING : Only competent service personnel may carry out work involving the testing or repair of this equipment

PIN SIGNAL DESCRIPTION MATCHING VALUE

1 Audio Output Right 0.5 Vrms, Impedance < 1kΩ, (RF 54% Mod)

2 Audio Input Right 0.5Vrms, Impedance > 10kΩ

3 Audio Output Left 0.5 Vrms, Impedance < 1kΩ, (RF 54% Mod)

4 Audio Earth

5 Blue Earth

6 Audio Input Left 0.5Vrms, Impedance > 10kΩ

7 Blue Input 0.7Vpp + 0.1V, Inpedance 75Ω

8 Slow Switching TV : 0 to 2V, AV : 4.5 to 12V, Impedance > 10kΩ

9 Green Earth

10 N.C

11 Green Input 0.7Vpp + 0.1V, Impedance 75Ω

12 N.C

13 Red Earth

14 Blanking Earth

15 Red Input 0.7Vpp 0.1V, Impedance 75Ω

Chroma Input 3dB for a luminance signal of 1 Vpp

16 Fast Switching 0 to 0.4V : Logic :"0", 1 to 3V : Logic "1", Impedance 75Ω

17 Video Out Earth

18 Video In Earth

19 Video Output 1 Vpp 3dB, Impedance 75Ω

20 Video Input 1 Vpp 3dB, Impedance 75Ω

21 Common Earth

21Pin EURO-SCART

SPECIFICATIONS

CIRCUIT BLOCK DIAGRAM

Microcontroller configuration : Service mode

To switch the TV set into service mode please see instruction below.

1 - Select pr. number 91

2 - Adjust sharpness to minimum and exit all menu.

3 - Quickly press the key sequence : RED - GREEN - menu

To exit SERVICE menu press menu key or Std By key.

In Service Mode press "OK" to the microcontroller i.e. the I2C bus is free and the set can be controlled by external

equipment.

Press "OK" again to allow the microcontroller to control the set again

Microcontroller configuration :

Tuner Option

TV set Alignment

1 - G2 alignment

- Set TV in NORMAL I mode

- TV in AV mode without video signal ? Black screen.

- TV preset with WP Red, WP Green and WP Blue equal to 32.

- TV preset with Black R, Black G equal to 8.

- Adjust screen volume ( on FBT ) such that the highest cathode cut-off voltage measured on CRT board, is Vcut-

off 5V

2 - White balance

- Select a dark picture and adjust Black G and Black R to the desired colour temperature.

- Select a bright picture and adjust WP Red, WP Green, WP Blue to the desired colour temperature.

ALIGNMENT INSTRUCTIONS

Option Tuner maker

DW DAEWOO / SAMSUNG

PHI LIPS (tuner internal AGC )

PH2 PHILIPS ( Video processor AGC )

Screen size Vcut-off

14" 115V

20" & 21" 125V

3 - Focus

- Adjust the Focus volume ( on FBT ) to have the best resolution on screen.

4 - Vertical geometry

- Adjust the Vertical Amplitude, Shift, S-Correction and Slope

to compensate for vertical distortion

5 - Horizontal picture centering

- Adjust H Shift to have the picture in the center of the screen.

7 - AGC

- Adjust the antenna signal level to 68dBµV 2 for Daewoo tuner (63dBµV 1 for Philips tuner)

- Set RF AGC to 0.

- Increase RF AGC level and stop when the level on pin 6 of I501 goes below 2.5 Vdc

ALIGNMENT INSTRUCTIONS

SCHEMATIC DIAGRAM

EXPLODED VIEW

DTB-21U6

PRINTED CIRCUIT BOARD

Table des matières

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