Daewoo DTA-21XXMZF, DTA-21SXMZF Service manual

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.

S/G No.:TCM800SEF0

APR. 2006

Service Manual

Color Television

CHASSIS :

Model :

DTA-21XXMZF/MTF/MEF/NZF/BZF

DTA-21SXMZF/MTF/MEF/NZF/BZF

CM-800S/801S

…

………

…

1. MOBEL DISCRIPTIONS OF CM-800S/801S CHASSIS

…………………… 2

2. SPECIFICATIONS

3. SAFETY INSTRUCTION

4. DESCRIPTION OF CM-800S/801S CHASSIS

5. ALIGNMENT INSTRUCTIONS

………………………………………………………………………… 4

………………………………………………………………… 5

………………………………… 6

………………………………………………………… 9

6. RECOMMANDED EEPROM DATA FOR CM-800S/801S

7. ELECTRICAL PARTS LIST

8. DIFFERENT PARTS LIST FOR EACH MODELS

9. SCHEMATIC DIAGRAM

10. PRINTED CIRCUIT BOARD

………………………………………………………………… 18

………………………………… 34

………………………………………………………………… 38

………………………………………………………… 42

11. MECHANICAL EXPLODED VIEW AND PARTS LIST

12. TROUBLE SHOOTING CHARTS

………………………………………………………… 46

…………………… 17

…………………………… 44

1. Model Descriptions of CM-800S Chassis

Enclosure

Model name

DTA-21A8*** A8 DTA-21A9*** A9 DTA-21A7*** A7 DTA-2132***

DTA-2130** DTA-2131** 31 DTA-2134** 34 DTA-21F2** F2

DTA-21U8** U8

Explanation of the suffix :

- The 1st suffix * can be M,N or B denoting NTSC and BOOSTER function as following table 1.

- The 2nd suffix * can be EF,PF,ZF or TF denoting PIP and TELETEXT function as following table 2.

- The 3rd suffix * can be Blank or B denoting the colour of front enclosure as following table 2.

construction

type

32 30

1st suffix*

The 1st suffix*

can be

M, N or B

Suffix

2nd suffix* 3rd suffix*

The 3rd suffix*

can be

Blank or BThe 2nd suffix*

can be

EF, PF, ZF

or TF

No suffix

Table 2.

2nd suffix*

3rd suffix*

Blank

TF With

PIP

Function

With

Without

TELETEXT

function

With

Without

Colour of

front enclosure

Silver and black

(Two tone)

Silver

(One tone)

Silver and black

(Two tone)

Silver

(One tone)

Silver and black

(Two tone)

Silver

(One tone)

Silver and black

(Two tone)

Silver

(One tone)

Table 1.

1st suffix*

M Without

With

BOOSTER FunctionNTSC Function

Without

B Without With

2. Model Descriptions of CM-801S Chassis

Model name

DTA-21S7** DTA-21S8**

Enclousure

construction type

(cosmetic change)

S7 The 1st suffix* can be S8

1st suffix*

MEF, MZF or MTF

Suffix

2nd suffix*

The 2nd suffix* can

There are no other differences between models.

Explanation of the suffix :

- The 1st suffix * can be MEF,MZF or MTF denoting PIP and TELETEXT function as follows.

- The 2nd suffix * can be Blank or B denoting the colour of front enclosure as follows.

Suffix**

1st suffix*

2nd suffix*

PIP

function

TELETEXT

function

Color of

front enclosure

Two tone

MEF

MEFB

MEF

Blank

With

(Silver and

black)

One tone

(Silver)

Two tone

MZF

MZFB

MTF

MTFB

MZF

MTF

Blank

Without

Blank

With

(Silver and

black)

One tone

(Silver)

Two tone

(Silver and

black)

One tone

(Silver)

Items

Chassis

CM-800S CM-801S

TV Standard Color system

Sound system

Rated Voltage AC 110-250V, 50/60Hz

Power consumption

Sound Output Power

Channel Conerage

Tuning System

Program No. Indication

Program Selection 200 Programs

Aux. Terminal

VHF

UHF

PAL/SECAM, NTSC-4.43 & 3.58(AV) *RF NTSC option

B/G, D/K, I, H, M(NTSC Option)

74W 74W

6W + 6W(at 1KHz 80% Mod.) 7W + 7W(at 1KHz 80% Mod.)

BAND I : CH 02 ~ CH04(48.25MHz ~ 62.25MHz) BAND II : CH05 ~ CH12(175.25MHz ~ 224.25MHz) CABLE BAND : S01 ~ S03(69.25MHz ~ 83.25MHz), S01 ~ S20, (105,25MHz ~ 294.25MHz) HYPER BAND : S21~S41(303.25 ~ 463.25MHz)

BAND IV, V : CH21 ~ CH69(471.25MHz ~ 855.25MHz)

FS Tuning System

ON-Screen Display

AV1/2 input Rear <RCA : input, Scart(Option): input, Output> AV1/2 input SIDE or FRONT DVD1(CVBS), DVD2(Y, Cr, Cb) OUTPUT< Monitor OUT>

Remote Control Unit R-55C03

3 SAFETY INSTRUCTION

NOTE :

BEFORE SERVICING THIS CHASSIS READ THE “X-RAY RADIATION PRECAUTIONS”, “SAFETY PRECAUTIONS” AND “PRODUCT SAFETY NOTICE” BELOW.

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 25.6KV [Normal Type](27.9KV [Flat Type]) at max beam current. The high voltage must not, under any circumstances, exceed 28.6KV [Normal Type] (30.9KV [Flat Type]). 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 XRAY 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) Always discharge the picture tube to avoid the shock harzard before removing the anode cap.

3) 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 (metal oxide film resistor) in the circuit board, keep the resistor 10 mm away from circuit board.

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

5. This receiver must operate between AC 110-250 volts, 50/60Hz. NEVER connect to DC supply or any other power 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 special 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.

4.1 BLOCK DIAGRAM

4.2 Overview of Main IC

Pin Assignment of LA76968

PIN PIN

FUNCTION FUNCTION 1 SIF Output 64 VIF Input1 2 VIF AGC 63 VIF Input2 3 SIF Input 62 IF Ground 4 FM Filter 61 RF AGC Output 5

FM Output / Selected Audio Output

60 Video Output 6 Audio Output 59 AFT Filter 7 SIF APC Filter 58 APC Filter 8 IF Vcc 57 Black Level Det. Filter 9 Ext. Audio Input or VM Output 56 Internal Video Input(S-C IN) 10 ABL 55 Video/Vertical Vcc 11 RGB Vcc 54 External Video Input(Y IN) 12 Red Output 53 Chroma APC Filter 13 Green Output 52

Selected Video Output or fsc Output

14 Blue Output 51 Cr Input 15 East/West Output 50 4.43MHz Crystal 16 V Ramp Osc. Capacitor 49 Cb Input 17 Vertical Output 48 Fast Blanking Input or DVD-Y 18 VCO IREF 47 Red Input or NC 19 Horizontal/BUS Vcc 46 Green Input or YC-Y 20 Horizontal AFC Filter or YC-C 45 Blue Input 21 Horizontal Output 44 Flyback Pulse Input 22 Video/Vertical/BUS Ground 43 CCD Vcc 23 P00/INT0/SO0 42 CPU Ground 24 P01/INT1/SI0,SB0 41 FILSCL 25 P02/SCK0 40 FILT 26 P03/INT3 39 RES# 27 P14/SI1,SB1 38 P13 28 P15/SCK1 37 P07/AN7 29 P16/T1PWM/SO1 36 P06/AN6 30 P17/TVPWMD 35 VDD 31 P04/AN4 34 XT2 32 P05/AN5 33 XT1

Block Diagram of LV1116

5.1 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 menus. 3 - Within 2 seconds press the key sequence : RED - GREEN - MENU

The SERVICE menu is displayed as below,

S1 S7-2 S2 S7-3 S3 S8-1 S4 S8-2 S5 S9 S6-1 S10-1 S11-1 S10-2 S11-2 S11-3 S12 S7-1

or Using the Service Remote controller, you can enter service mode directly. To exit SERVICE menu press menu key or Stand By key.

5.2 SERVICE MODE NAVIGATION Pr Up/Down remote keys : cycle through the service items available. Vol -/+ remote keys : Dec./Increment the values within range - Cycle trough option bits.

Heat Run Reg, 2 Screen Sound Test Reserved AGC 4 : 3 GEO 50 4 : 3 GEO 60 16 : 9 GEO ZOOM GEO Reg. 1

PIP W&B Scr W&B Dp Option Device

Outgoing

5.3. CONTROL BITS

There are 4 option bytes available (16 bits in all). These option bits are available from FACTORY and SERVICE mode. First find the OPTION1, OPTION2, OPTION3 or OPTION4 control, and then use the UP/DOWN and PLUS/MINUS keys on the relevant remote keypad to control the bits. The table below shows the three option bytes available; Default setting in case of virgin EEPROM are shown in light grey.

B7 B6 B5 B4 B3 B2 B1 B0

TEXT TOP

‘OFF’

TEXT TOP

'ON'

TEXT FLOF 'OFF'

TEXT FLOF

Fixed to

‘0’

Teletext ON

Teletext OFF

NTSC M OFF

NTSC M ON

TUNER OPTIONS

(see table below)

default :sanyo

B7 B6 B5 B4 B3 B2 B1 B0

Praytime

‘ON’

‘OFF’

Daewoo Logo ON Daewoo Logo OFF

CRT slim

CRT normal

Koran functions enabled Koran functions disabled

Local key option

(see table below)

default :6key(11)

Fixed to

‘1’

B7 B6 B5 B4 B3 B2 B1 B0

Curtain

OFF

Curtain

Teletext language table

Fixed to

‘0’

PIP OFF

PIP ON

Fixed to

‘0’

Fixed to

‘0’

Fixed to

‘0’

B7 B6 B5 B4 B3 B2 B1 B0

Koran

Not used, must be set to 1

for future compatibility

Fixed to

‘0’

direct key enabled Koran direct key

Fixed to

‘0’

Fixed to

‘0’

disabled

DVD OFF

DVD ON

5.4 USER GUIDE

5.4.1 ENTERING FACTORY MODE To switch the TV set into FACTORY mode, use the factory remocon, and press on S10. The factory menu will appear on the screen, showing “VER xx.xx DATE d xx m xx y xx” (where xx.xx is the software version, “d xx m xx y xx” means date ).

5.4.2 ENTERING OPTION BITS MENU To find the option bits, push the button S10 one more. OPTION BITS TABLE as below will appear.

ex).

5.4.3 SELECTING OPTION BITS From left to right, bits 7 to 0 are shown. Navigation is done from the with the factory remocon with the VOL MIN and VOL MAX buttons. The selected bit is changed RED from BLUE.

5.4.4 TOGGLING OPTION BITS This is done by using the PR UP and PR DOWN buttons.

5.4.5 CHANGING OPTION1,2,3,4 to go option2, go to the option1 with VOL left/right buttons. and push the PR UP and PR DOWN buttons. Option1,2,3,4 are changed as below

(S10-1) EPROM & OPTION & DEVICE EDIT

Ver. xx.xx DATE dxx mxx yxx

7 bit 0 HEX OPTION1 1 0 1 1 1 0 0 1 B9 OPTION2 0 0 1 1 1 1 1 0 3E OPTION3 1 1 1 1 0 1 0 0 F4 OPTION4 1 1 1 0 1 0 0 0 E8

< OPTION1 -> OPTION2 -> OPTION3 -> OPTION4 -> OPTION1 >

5.4.6 EXITING OPTION BITS MENU To exit from option bits table, Push the button S10 twice.

5.5 CONTROL DESCRIPTION

5.5.1 OPTION 1 BITS FLOF/Fastext (Bit 6) Enables/disables the TV from displaying FLOF row 24 link titles.

Teletext ON/OFF (Bit 4) Enables/disables the Teletext on TV. If Teletext is disabled, user can not select clock prog and in features menu.

NTSC M ON/OFF (Bit 3) Enables/disables NTSC M function.

Tuner (Bits 2, 1 & 0) Configures the software to communicate with the tuner via i2c bus. Incorrect configuration may not be immediately obvious, but will result in loss of functionality (e.g. unable to tune UHF channels, unable to tune some hyperband channels).

Bit2 Bit1 Bit0 LNA

000No

001No

010No 011No 100101-

110yes

111-

5.5.2 OPTION 2 BITS Daewoo Logo ON/OFF (Bit 6) Enables/disables the display of Daewoo logo at power on.

CRT slim/normal (Bit 5) You must enable this bit for slim CRT which need V-SHIFT adjustment.

Koran functions enabled/disabled (Bit 4) Enables/disables the Koran function at power ON. If OSD language is not Persian or Arabic, this function is disabled.

Philips(external AGC)

Sanyo

Samsung TECC2949PG35W Should not be used Should not be used

Should not be used

Tuner

UV1316A I-4

115-B-8A86EU

TAEM-G008D

TAEM-G605D

Local key option (Bit 3 & 2)

11 10 00

0 mV ~ 700 Mv

700 mV ~ 1.40V

1.40V ~ 2.10 V

2.10 V ~ 2.80 V

2.80 V ~ 3.50 V

3.50 V ~ 4.20 V

4.20 V ~ 5.00 V

5.5.3 OPTION 3 BITS Curtain ON/OFF (Bit 7) Enables/disables the curtain function at power ON.

Teletext language option (Bit 6, 5& 4)

Prog. Up

Prog. Dwn

Vol. Up

Vol. Dwn

TV/AV

Latin West

Latin East

Russia

Persia Arabic

Automatic

Not used Not used

…

Power(ST_BY on/off)

Prog. Up

Prog. Dwn

Vol. Up

Vol. Dwn

TV/AV

Bit 6, 5& 4

000 001 010 011 100 101

111

recommend Automatic mode(111).

PIP ON/OFF (Bit 2) Enables/disables PIP function.

5.5.4 OPTION 4 BITS DVD ON/OFF (Bit 0) Enables/disables DVD function. 0 DVD ON : RF -> AV1/AV2 -> DVD1 -> DVD2 -> GAME 1 DVD OFF : RF -> AV1/AV2 -> GAME

Koran direct key enabled/disabled (Bit 3) When set to 1, pressing Yellow key makes the pray menu come on screen. When set 0, the function is disabled. If OSD language is not Persian, this option bit is ignored.

5.5.4 TV SET ALIGNMENT

(1) Screen (G2) Alignment (S2) (1)-1. Screen Alignment will be performed after sufficient Heat-Run of Set. (1)-2. Press the "S1" key of service remote controller to the heat run mode off. (1)-3. Receive the RETMA(or COLOR BAR) PATTERN. (1)-4. Press the "S2" key on the service remocon. #. Preparatory Focus (G1) Alignment

- You must try to Focus Alignment roughly for exact SCREEN alignment.

- Adjust the Focus VR of the FBT (T401) so that the center circle of RETMA Signal is

clear and sharp. (1)-5. Turn round the Screen Volume of FBT until to the horizontal line of screen disappear. (1)-6. Press the "S2" key of service remote controller again.

(2) AUTO AGC Alignment (S5) (2)-1. Make sure option bits are correct for the tuner fitted on the chassis . (2)-2. Receive the COLOR BAR PATTERN(or similar pattern) of VHF-HIGH channel. (2)-3. Control the RF signal level at 62±1dBuV (2)-4. Press "S5" key of the service remocon, so that AGC is automatically adjusted. * you can manually adjust, using the under side AGC key of remote controller.

(3) Geometry Alignment (S6) Receive the RETMA PATTERN and Press the "S6" key of service remocon. (3)-1. Using the " ◄ VOL / VOL ► " key of "H-CENTER" in service remote controller, Adjust the Horizontal Center of the picture. (3)-2. Using the " ◄ VOL / VOL ► " key of "H-SIZE" in service remote controller, Adjust the Horizontal Size of the picture(RETMA PATTERN). (3)-3. Using the " ◄ VOL / VOL ► " key of "V-SHIFT(Slim CRT) or V-CENTER(Normal CRT)" in service remote controller, Adjust the Vertical Center of the picture. (3)-4. Using the " ◄ VOL / VOL ► " key of "V-SIZE" in service remote controller, Adjust the Vertical Size of the picture.

(4) EAST / WEST Alignment (S6)

Receive the CROSS-HATCH PATTERN and Press the "S6" key of service remocon. (4)-1. Using the " ◄ VOL / VOL ► " key of "EW-PARA" in service remote controller, Adjust the Parabolic distortion of the picture.

(4)-2. Using the " ◄ VOL / VOL ► " key of "EW-TRAP" in service remote controller, Adjust the Parabolic distortion of the picture.

(4)-3. Using the " ◄ VOL / VOL ► " key of "EW-COR-T / B" in service remote controller, Adjust the Parabolic distortion of the picture.

(5) WHITE BALANCE Alignment (S8)

(5)-1. Select a dark picture and adjust R-BIAS and G-BIAS to the desired colour temperature. (5)-2. Select a bright picture and adjust R-DRIVE and B-DRIVE to the desired colour temperature.

(6) SUB-BRIGHTNESS ALIGNMENT (S9) (6)-1. Receive PAL RETMA signal. (6)-2. Using the " ◄ VOL / VOL ► " key of "SUB-BRI" in service remote controller, Adjust the sub-bright(brightness) for suitable brightness of picture.

5.5.5 Remote control

TV MODE TELETEXT MODE

1.POWER 1.POWER

2.SOUND MUTE 2.SOUND MUTE

3.NUMBER 0..9 3.NUMBER 0..9

4.TV / AV 4.

5.NORMAL 5.

6.RECALL 6.

7.MENU 7.VOL/BRI SELECTION

8.PROGRAM UP(CURSOR UP) 8.PAGE UP

9.VOLUME DOWN (CURSOR LEFT) 9.VOL / BRIGHT DOWN

10.VOLUME UP(CURSOR RIGHT) 10.VOL / BRIGHT UP

11.PROGRAM DOWN(CURSOR DOWN) 11.PAGE DOWN

12.MODE 12.

13.OK / PRESET 13.INDEX

14.PIP ON 14.RED

15.PIP PICTURE SWAP/FREEZE 15.GREEN

16.PIP POSITION 16.YELLOW

17.PIP PICTURE SOURCE 17.CYAN

18. 18.CANCEL

19. 19.PAGE HOLD

20.TV -> TELETEXT 20.TELETEXT -> TV

21. 21.REVEAL

22. 22.SUBPAGE

23.PIP PICTURE SIZE 23.HEIGHT

24.SLEEP 24.

25.ZOOM 25.

26.3D (SOUND EFFECT) 26.

+ 38 hidden pages