Daewoo KR14E5/DTA-14V3VM Service Manual

Chassis: cp-185m color television

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Service Manual

Color Television

CHASSIS : CP-185M

Model : KR14E5/DTA-14V3VM

KR20E5/DTA-20V3VM

KR21E5/DTA-21V3VM

14V3/20V3/21V3

Specification

Version

PAL-SECAM B/G-D/K

TV Standard

MONO

Sound system

Power Consumption

14": 39W; 20": 42W; 21": 45W

2.5W(at 60% mod, 10% THD)

Sound Output Power

Speaker

NONE

Teletext system

75ohm unbalanced

Aerial Input

Channel coverage

Off-air cannels, S-cable channels and hyperband

Tuning System

Frequency synthesiser tuning system

14" : 34cm

Visual screen size

20" : 48cm

21" : 51cm

On screen Display

Channel indication

Program selection

100 programmes

EURO-SCART:Audio /Video and Out, R/G/B in,

Auxiliary Output Terminal

slow and fast wtching, SVHS in.

Audio-Video jack on front of cabinet in common

connection with EURO-SCART.

Headphone jack(3.5mm)on front of cabinet

Remote Control

R-40A10

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

S/M No. : TCP185MEF1

8 ohm

Feb. 2001

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Page 1: Service Manual
S/M No. : TCP185MEF1 Service Manual Color Television CHASSIS : CP-185M Model : KR14E5/DTA-14V3VM KR20E5/DTA-20V3VM KR21E5/DTA-21V3VM 14V3/20V3/21V3 Specification Version PAL-SECAM B/G-D/K TV Standard MONO Sound system Power Consumption 14": 39W; 20": 42W; 21": 45W 2.5W(at 60% mod, 10% THD) Sound Output Power...
Page 2: Table Of Contents
TABLE OF CONTENTS SAFETY INSTRUCTION........................2 SPECIFICATIONS ..........................3 1. 21 Pin EURO-SCART ..........................3 2 Channel table ...............................4 CIRCUIT BLOCK DIAGRAM.......................6 ALIGNMENT INSTRUCTIONS ......................7 1. Service mode ...............................7 2. Microcontroller configuration ........................7 3. TV SET Alignment............................7 SCHEMATIC DIAGRAM........................9 EXPLODED VIEW ..........................10 PRINTED CIRCUIT BOARD........................13 SERVICE PARTS LIST........................14 1.
Page 3: Safety Instruction
SAFETY INSTRUCTION WARNING : Only competent service personnel may carry out work involving the testing or repair of this equipment 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”...
Page 4: Specifications
SPECIFICATIONS 21Pin EURO-SCART SIGNAL DESCRIPTION MATCHING VALUE Audio Output Right 0.5 Vrms, Impedance < 1kΩ, (RF 54% Mod) Audio Input Right 0.5Vrms, Impedance > 10kΩ Audio Output Left 0.5 Vrms, Impedance < 1kΩ, (RF 54% Mod) Audio Earth Blue Earth Audio Input Left 0.5Vrms, Impedance >...
Page 5: Channel Table
SPECIFICATIONS Channel table FREQUENCY TABLE CP-185M EUROP GB(IRE- EAST EUROP GB(IRE- EAST FRANCE FRANCE E CCIR LAND) OIRT E CCIR LAND) OIRT 46.25 45.75 49.75 623.25 623.25 623.25 623.25 48.25 55.75 (L') 53.75 59.25 631.25 631.25 631.25 631.25 55.25 60.5 (L') 61.75 77.25 639.25...
Page 6 SPECIFICATIONS EUROP GB(IRE- EAST EUROP GB(IRE- EAST FRANCE FRANCE E CCIR LAND) OIRT E CCIR LAND) OIRT 311.25 311.25 311.25 311.25 112.25 116.75 111.25 112.25 119.25 128.75 119.25 119.25 319.25 319.25 319.25 319.25 327.25 327.25 327.25 327.25 126.25 140.75 127.25 126.25 133.25 152.75...
Page 7: Circuit Block Diagram
CIRCUIT BLOCK DIAGRAM...
Page 8: Alignment Instructions
In Service Mode press “ OK” to stop 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 Option Tuner maker DAEWOO / SAMSUNG PHILIPS ( Video processor AGC ) PHILIPS (tuner internal AGC ) System Option Option System...
Page 9 - Adjust H Shift to have the picture in the center of the screen. 7 - AGC - Adjust the antenna signal level to 68 dBµV± 2 for Daewoo tuner (63 dBµV± 1 for Philips tuner). - Set RF AGC to 0.
Page 11: Exploded View
EXPLODED VIEW 1. 14V3...
Page 12 EXPLODED VIEW 2. 20V3...
Page 13 EXPLODED VIEW 3. 21V3...
Page 14: Printed Circuit Board
PRINTED CIRCUIT BOARD CIRCUIT DIAGRAM 6. SERVO/SYSCON/CEC CIRCUIT DIAGRAM(T-DECK)
Page 15: Service Parts List
ELECTRICAL PARTS LIST CAUTION “ “ is a safety part, so it must be used the same part. “ ” is a recommendable part for essential stock. LOC. PART CODE PART NAME PART DESCRIPTION REMARK LOC. PART CODE PART NAME PART DESCRIPTION REMARK ZZ110...
Page 16 ELECTRICAL PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION REMARK LOC. PART CODE PART NAME PART DESCRIPTION REMARK SCT1 4859303430 SOCKET CRT PCS633A C412 CEXF2C339V C ELECTRO 160V RSS 3.3MF (8X16) TP 5PK2960M-- FILTER SAW K2960M C414 CMXM2A104J C MYLAR 100V 0.1MF J (TP) SW801 5S40101146...
Page 17 ELECTRICAL PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION REMARK LOC. PART CODE PART NAME PART DESCRIPTION REMARK C808 CEXF1H479V C ELECTRO 50V RSS 4.7MF (5X11) TP C523 CCZF1H103Z C CERA 50V F 0.01MF Z C820 CCXB3A471K C CERA 1KV B 470PF K (T) C529 CBZF1H104Z...
Page 18 ELECTRICAL PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION REMARK LOC. PART CODE PART NAME PART DESCRIPTION REMARK D830 D1N4937G-- DIODE 1N4937G (TAPPING) R401 RD-4Z272J- R CARBON FILM 1/4 2.7K OHM J D831 D1N4937G-- DIODE 1N4937G (TAPPING) R404 RD-4Z399J- R CARBON FILM 1/4 3.9 OHM J D840...
Page 19 ELECTRICAL PARTS LIST LOC. PART CODE PART NAME PART DESCRIPTION REMARK LOC. PART CODE PART NAME PART DESCRIPTION REMARK R590 RD-4Z103J- R CARBON FILM 1/4 10K OHM J R830 RD-AZ332J- R CARBON FILM 1/6 3.3K OHM J R591 RD-AZ221J- R CARBON FILM 1/6 220 OHM J R840 RD-4Z220J-...
Page 20: The Different Parts List
ELECTRICAL PARTS LIST DIFFERENT PART LIST PART NAME 14 INCH 20 INCH 21 INCH C404 C MYLAR 1.6KV BUP 8200PF J 1.6KV BUP 8200PF J 1.6KV BUP 7500PF J C408 C MYLAR 200V PU 0.33MF J 200V PU 0.27MF J 200V PU 0.27MF J C417 C MYLAR...
Page 21 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : “ DAEWOOELEC” E-mail : djkoo@web.dwe.co.kr TEL : 82-2-360-7806 FAX : 82-2-360-7877...
Page 22 APPENDIX FUNCTIONAL DESCRIPTION for CP-185/M FUNCTIONAL DESCRIPTION OF VIDEO PROCESSOR Vision IF amplifier The vision IF amplifier can demodulate signals with positive and negative modulation. The PLL demodulator is completely alignment-free. The VCO of the PLL circuit is internal and the frequency is fixed to the required value by using the clock frequency of the µ-Controller/Teletext decoder as a reference.
Page 23: Functional Description
APPENDIX FUNCTIONAL DESCRIPTION The vertical synchronisation is realised by means of a divider circuit. The vertical ramp generator needs an external resistor and capacitor. For the vertical drive a differential output current is available. The outputs are DC coupled to the vertical output stage.
Page 24 APPENDIX FUNCTIONAL DESCRIPTION RGB output circuit and black-current stabilisation In the RGB control circuit the signal is controlled on contrast, brightness and saturation. The ICs have a linear input for external RGB signals. The signals for OSD and text are internally supplied to the control circuit. The output signal has an amplitude of about 2 Volts black-to-white at nominal input signals and nominal settings of the various controls.
Page 25 APPENDIX FUNCTIONAL DESCRIPTION For SECAM L and L’ the TDA9361/TDA9381 is switched to positive modulation via I2C bus. SECAM L’ transmission only occur in VHF band I and have their picture and sound carrier interchanged, compared to SECAM L and PAL B/G channels. For SECAM L’...
Page 26 APPENDIX FUNCTIONAL DESCRIPTION Fast R, G, B insertion : The external R, G, B insertion needs a fast switching and cannot be controlled by the software ( instruction cycle of 1µ sec ). The fast switching pin 16 of SCART is directly connected to the TV processor pin 45 ( Fast blanking input ).
Page 27 APPENDIX FUNCTIONAL DESCRIPTION 5. SECAM L/L’ sound switching circuit. The microcontroller pin 4 is a three levels output. The voltage and configuration of this port is described below : Sound mode Port configuration Voltage Push Pull Internally shorted to ground AM L Push Pull Pull up to 3.3V...
Page 28 APPENDIX FUNCTIONAL DESCRIPTION 8. Power supply (STR F6653) 8-1. STR-F6653 general description The STR-F6653 is an hybrid IC with a build-in MOSFET and control IC, designed for flyback converter type switch mode power supply applications. 8-2. Power supply primary part operations An oscillator generates pulse signals which turn on and off a MOSFET transistor.
Page 29 APPENDIX FUNCTIONAL DESCRIPTION O.V.P.volt age 20.5V 16V (TY P.) Shutdown voltage 11V Waveform of Vin pin voltage at start- up 8-2-1. STR-F6653 oscillating operation TO PIN4 SM PS STR-F6653 DRAIN DRIVE Comp.1 V th(1) SOURCE R808 1.35mA OCP/FB From PIN 6 SM PS (FEEDBACK) V th(2)
Page 30 APPENDIX FUNCTIONAL DESCRIPTION 6.5 V (STR -F6653 internal capacitor) 3.7 V 0.73 V Pin 1 (OCP / FB) (M OSFET drain current) (M OSFET drain - source voltage) M O S F E T switching ON / OFF Waveforms during oscillating operation - When the MOSFET is ON, the STR-F6653 internal capacitor C1 is charged at the constant voltage 6.5V.
Page 31 APPENDIX FUNCTIONAL DESCRIPTION 8-2-3. STR-F6653 protection circuits overcurrent protection function (OCP) Overcurrent protection is performed pulse by pulse detecting at STR-F6653 pin 1 (OCP) the peak of the MOSFET drain current in every pulse. latch circuit This circuit sustains an output low from the STR-F6653 internal oscillator and stops operation of the power supply when over- voltage protection (OVP) and thermal shutdown (TSD) circuit are in operation thermal shutdown circuit (TSD) °...
Page 32 APPENDIX FUNCTIONAL DESCRIPTION 9-1-2. TV start-up and microcontroller initialisation - When SW801 power switch is pushed, main AC voltage is applied to T801 transformer (after rectification by D801...D804 diodes). Then, T801 SMPS transformer starts operating and supplies DC voltage to I823 (3.3V regulator). - This regulator provides 3.3V DC voltage to I501 microcontroller power supply pins (pins 54, 56, 61) and to the reset pulse cir- cuit which provides reset pulse to I501 microcontroller reset pin (pin 60).
Page 33 APPENDIX FUNCTIONAL DESCRIPTION 9-1-4. Reset pulse circuit operations description - When DC supply voltage from I823 regulator starts rising (from 0V to 1.2V), no current flows through D591 zener diode. So, Q510 is in off mode. Also V =Vcc/2 -Vcc = -Vcc/2 > -0.6V. So, Q511 is in off mode. be Q511 Then, no voltage reaches I501 pin 60.
Page 34 APPENDIX FUNCTIONAL DESCRIPTION In normal run mode, I501 microcontroller pin 63 (power) is set to high So, I810 controlled rectifier is not conducting - Q809 is conducting. So, Q808 is not conducting and Q807 is conducting - So, Q807 collector is connected to the ground and I810 controlled rectifier gate pin is set to low (no conducting) So, current from 11V DC voltage (from T801 SMPS transformer pin 13) does not flow through Q811 and Q810 transistors but flows through I806 IC error amplifier - Q809 is conducting.
Page 35 APPENDIX FUNCTIONAL DESCRIPTION 9-2-1-3. power supply functioning during TV set normal run mode - I801 transmits controlled pulses to T801 which generates DC voltages after rectification by secondary side diodes and electrolytic capacitors (for example by D820 and C813 to give 124V -110V supply voltage line). - 8V, 5V, 3.3V supply voltage lines have stabilised voltages obtained by I822, I820, I823 voltage regulators.
Page 36 APPENDIX FUNCTIONAL DESCRIPTION I810 CONTROLLED RECTIFIER 6V DC HIGH R829 R830 R820 C830 HIGH Q807 Q808 HIGH POWER Q809 I810 controlled rectifier switching circuit 9-2-2-2. TV set stand-by mode operations -In stand-by mode, I501 microcontroller pin 63 (power) is set to low. - So, Q809 collector is set to high.
Page 37: Ic Description
APPENDIX IC DESCRIPTION 1. TDA9361 : TV signal processor - Teletext decoder with embedded µ-Controller. TDA9381 : TV signal processor - with embedded µ-Controller. TV-signal Processor • Multi-standard vision IF circuit with alignment-free PLL demodulator • Internal (switchable) time-constant for the IF-AGC circuit •...
Page 38 APPENDIX IC DESCRIPTION Data Capture • Text memory 10 pages • Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page Table (SPT) • Data Capture for 525/625 line WST, VPS (PDC system A) and Wide Screen Signalling (WSS) bit decoding Automatic selection between 525 WST/625 WST •...
Page 39 APPENDIX IC DESCRIPTION Data Capture Features - Video Signal Quality detector - Data Capture for 625 line WST - Data Capture for 525 line WST - Data Capture for US Closed Caption - Data Capture for VPS data (PDC system A) - Data Capture for Wide Screen Signalling (WSS) bit decoding - Automatic selection between 525 WST/625WST - Automatic selection between 625WST/VPS on line 16 of VBI...
Page 40 APPENDIX IC DESCRIPTION...
Page 41 APPENDIX IC DESCRIPTION IC marking and version IC marking Chassis OSD languages Text ( line 3 ) CP 185 DW9361/N1/3-DE1 English, French, German, Italian, Spanish, English, ( note : x is the software Dutch, Danish, Finnish, Norwegian, Swed- German, version ) ish, Greek, Hungarian, Swedish/Finnish/Hungarian, Italian, French, Portuguese/Spanish, Turk-...
Page 42 APPENDIX IC DESCRIPTION IFIN1 IF input 1 IFIN2 IF input 2 IREF Reference current input vertical sawtooth capacitor TUNERAGC tuner AGC output AUDEEM audio deemphasis DECSDEM decoupling sound demodulator GND2 ground 2 for TV processor SNDPLL narrow band PLL filter SNDIF n.u.
Page 43 APPENDIX IC DESCRIPTION...
Page 44 APPENDIX IC DESCRIPTION 2. TDA9830 TV sound AM-Demodulator and audio source switch The TDA9830, a monolithic integrated circuit, is designed for AM-sound demodulation used in L and L’ standard. The IC provides an audio source selector and also mute switch. Block Diagram : TDA9830...
Page 45 APPENDIX IC DESCRIPTION Pinning Symbol Description IFIN Sound IF differential input signal n.c. Not connected AGC capacitor REF voltage filtering capacitor n.c. Not connected AMOUT AM demodulator output AMIN Input signal from audio switch AFOUT Output signal from audio switch EXTIN Input signal (from external) to audio switch SWITCH...
Page 46 APPENDIX IC DESCRIPTION Pinning Symbol Description Supply voltage Audio output Supply Voltage Rejection Audio input n.c. Not Connected S-GND Signal ground n.c. Not Connected n.c. Not Connected P-GND P Ground P-GND P Ground P-GND P Ground P-GND P Ground P-GND P Ground P-GND P Ground...
Page 47 APPENDIX IC DESCRIPTION Pinning Symbol Description Vi(pos) input voltage (positive) Vi(neg) input voltage (negative) supply voltage output voltage B ground Vflb flyback supply voltage output voltage A guard output voltage O(guard) input measuring resistor...
Page 48 APPENDIX IC DESCRIPTION 5. TDA6107Q The TDA6107Q includes three video output amplifiers in one plastic DIL-Bent-SIL 9-pin medium power package, using high voltage DMOS technology, and is intended to drive the three cathodes of a colour CRT directly. To obtain maximum perfor- mance, the amplifier should be used with black-current control.
Page 49 APPENDIX IC DESCRIPTION 6. 24C08 8 Kbit EEPROM features : - 8 Kbit serial I2C bus EEPROM - Single supply voltage : 4.5 V to 5.5 V - 1 Million Erase/Write cycles (minimum) - 40 year data retention (minimum) Pin description Pin No.
Page 50 APPENDIX IC DESCRIPTION 7-3. Block diagram 7-4. pin description NAME SYMBOL DESCRIPTION Overcurrent feedback O.C. P/E.B. Input of over current detection signal and feedback signal Source Mosfet source Drain Mosfet drain Supply Input of power supply for control circuit Ground Ground...
Page 51 APPENDIX IC DESCRIPTION 7-5. Control part - electrical characteristics IC PINS RATING DESCRIPTION SYMBOL UNIT NUMBER MIN. TYPE (on) Operation start voltage 14.4 17.6 (off) Operation stop voltage (on) Circuit current in operation (off) µA Quiescent current in non-operation (max) µSEC Maximum off time Minimum time for input of quasi resonant...

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