Daewoo DTX-21G2 Service Manual
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Daewoo DTX-21G2 Service Manual

Daewoo DTX-21G2 Service Manual

Color television daewoo dtx-21g2/ dtx-21b4/ dtx-21u7
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Service Manual

COLOR Television
CHASSIS :
Model :
DTX-21G2/21B4/21U7
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.
P/N:TCP520VEF0
CP-520V
Dec. 2006

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Summary of Contents for Daewoo DTX-21G2

  • Page 1: Service Manual

    COLOR Television CHASSIS : CP-520V Model : DTX-21G2/21B4/21U7 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.

  • Page 2: Table Of Contents

    CP-520V Service Manual CONTENTS DOCUMENT HISTORY 1 MAIN FEATURES 1.1 SPECIFICATIONS 1.1.1 GENERAL 1.1.2 EURO-SCART 1 (21 Pin) 1.1.3 EURO-SCART 2 (21 Pin) 1.2 CHANNEL/FREQUENCY TABLE 2 SAFETY INSTRUCTION 3 ALIGNMENT INSTRUCTIONS 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE 3.2 SERVICE MODE NAVIGATION 3.3 MICROCONTROLLER CONFIGURATION : OPTION BITS 3.4 OPTION 1 3.5 OPTION 2...
  • Page 3 5.4.1 The UOC III TV Sound Concept 5.4.2 Functional Overview Of the digital controller sound part 5.4.3 Demodulator and decoder 6 SERVICE PARTS LIST 6.1 DTX-21G2FZP-SB 7 EXPLODED VIEW 7.1 DTX-21G2 7.2 DTX-21B4 7.3 DTX-21U7 8 PRINTED CIRCUIT BOARD 8.1 4859813693(OLD PCB) 8.2 4859816393(NEW PCB) 9 SCHEMATIC DIAGRAM 9.1 CP-520V...

  • Page 4: Document History

    CP-520V Service Manual DOCUMENT HISTORY VERSION DATE COMMENTS 07/07/06 Creation of document (Author JS KIM) for project CP520 50Hz TV. V1.46...

  • Page 5: Main Features

    CP-520V Service Manual MAIN FEATURES 1.1 SPECIFICATIONS 1.1.1 GENERAL TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/L’ Colour system Tuner PAL, SECAM PAL, SECAM, PAL 60, NTSC M, NTSC 4.43 Sound system NICAM B/G, I, D/K, L, FM 2Carrier B/G, D/K Power consumption...

  • Page 6: Euro-Scart 2 (21 Pin)

    CP-520V Service Manual Slow Switching TV : 0 to 2V, AV 16/9 : 4.5 to 7V, AV 4/3 : 9.5 to 12V , Impedance > 10 kΩ Green Earth N.C. 0.7 Vpp ± 0.1V, Impedance 75Ω Green Input N.C. Red Earth Blanking Earth 0.7 Vpp ±...

  • Page 7: Channel/Frequency Table

    CP-520V Service Manual 1.2 CHANNEL/FREQUENCY TABLE CHANNEL EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT 46.25 45.75 49.75 48.25 55.75 (L') 53.75 59.25 55.25 60.5 (L') 61.75 77.25 62.25 63.75 (L') 175.25 85.25 175.25 176.00 183.25 93.25 182.25 184.00 191.25 175.25 189.25 192.00 199.25 183.25...
  • Page 8 CP-520V Service Manual 671.25 671.25 671.25 671.25 679.25 679.25 679.25 679.25 687.25 687.25 687.25 687.25 695.25 695.25 695.25 695.25 703.25 703.25 703.25 703.25 711.25 711.25 711.25 711.25 719.25 719.25 719.25 719.25 727.25 727.25 727.25 727.25 735.25 735.25 735.25 735.25 743.25 743.25 743.25 743.25...
  • Page 9 CP-520V Service Manual 280.25 136.00 295.25 280.25 287.25 160.00 303.25 287.25 294.25 294.25 303.25 303.25 303.25 311.25 311.25 311.25 311.25 319.25 319.25 319.25 319.25 327.25 327.25 327.25 327.25 335.25 335.25 335.25 335.25 343.25 343.25 343.25 343.25 351.25 351.25 351.25 351.25 359.25 359.25 359.25...

  • Page 10: Safety Instruction

    CP-520V Service Manual SAFETY INSTRUCTION WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment. X-RAY RADIATION PRECAUTION 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 25KV at max beam current.

  • Page 11: Alignment Instructions

    CP-520V Service Manual ALIGNMENT INSTRUCTIONS 3.1 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 software version is displayed beside the word Service, e.g.

  • Page 12: Option 1

    Daewoo 7 keys Double future PICTURE Basic Remote control lacal Window compa TILT OFF ATSS control keyboard Disabled tibility OPTION OPTION CHASSIS MODEL DW[hex] REMARKS BIT[b7… b0] 0011 1110 OPTION1 “ b1,b0” - CP-520V DTX-21G2/B4/U7 depends on Tuner 0000 1111...

  • Page 13: Nvm Default Setting

    CP-520V Service Manual 3.6 NVM default setting The purpose of this message, when you change a virgin EEPROM, is to allow to modify the NVM DATA to desired values. 1 - Introduction : The NVM default valus are fixed for the user, but for flexibility in service, these data are stored in NVM and can be changed when the TV set is in a special mode call "NVM EDITOR".
  • Page 14 CP-520V Service Manual NVM DATA CHANGE LIST (hex) CP-520V No Register Name Address Default 21G2/B4/U7 OCP_THRESHOLD 0x58F < 0x91 DCXO 0x590 < 0x4E AGC_PHILIPS 0x5C1 0xAB < AGC_NC 0x5C2 0xAB < AGC_ALPS, LG 0x5C3 0xB6 < AGC_PARTSNIC 0x5C4 < 0xB6 AGC_PHILIPS_START 0x5C5 0x16...

  • Page 15: Tv Set Alignment

    CP-520V Service Manual 3.7 TV SET ALIGNMENT 3.7.1 G2 ALIGNMENT - Tune a colour bar pattern. - Find the “G2 – SCREEN” item in service mode. - Adjust screen volume (on FBT) to bring the cursor to central position(Green). 3.7.2 WHITE BALANCE - Select a dark picture and adjust RED BIAS and GRN BIAS to the desired colour temperature.

  • Page 16: Ic Description

    CP-520V Service Manual IC DESCRIPTION 4.1 UOC Series The UOC series combines the functions of a Video Signal Processor (VSP) together with a FLASH embedded TEXT/Control/Graphics µ-Controller (TCG µ-Controller) and US Closed Caption decoder. In addition the following functions can be added: •...

  • Page 17: Block Diagram

    CP-520V Service Manual 4.1.2. BLOCK DIAGRAM...

  • Page 18: Pinning

    CP-520V Service Manual 4.1.3. PINNING QFP 128pin Symbol Short Description P1.5/TX Port 1.5 or UART bus P1.4/RX port 1.4 or UART bus P1.2/INT2 port 1.2 or external interrupt 2 VSSC3 Ground VDDC3 digital supply to core (1.8V) P2.5/PWM4 port 2.5 or PWM4 output P2.4/PWM3 port 2.4 or PWM3 output VSSC/P...
  • Page 19 CP-520V Service Manual Green output Red output BLKIN black current input BCLIN beam current limiter input 3rd supply for TV processor GND3 ground 3 for TV-processor B/PBIN3 3rd B input / PB input G/YIN3 3rd G input / Y input R/PRIN3 3rd R input / PR input INSSW3...
  • Page 20 CP-520V Service Manual AGC sound IF / internal-external AGC for DVB SIFAGC/DVBAGC (2) applications PLLIF IF-PLL loop filter GND2 ground 2 for TV processor QSS intercarrier output / AM output / deemphasis QSSO/AMOUT/AUDEE (front-end audio M (2) out) DECSDEM decoupling sound demodulator AUDOUTSR audio output for SCART/CINCH (right signal) AUDOUTSL...

  • Page 21: Features

    CP-520V Service Manual 4.1.4 FEATURES Analogue Video Processing (all versions) · Multi-standard vision IF circuit with alignment-free PLL demodulator · Internal (switchable) time-constant for the IF-AGC circuit · Switchable group delay correction and sound trap (with switchable centre frequency) for the demodulated CVBS signal ·...
  • Page 22 CP-520V Service Manual windows in parallel. · Linear and non-linear horizontal scaling of the video signal to be displayed. Sound Demodulation (all versions) · Separate SIF (Sound IF) input for single reference QSS (Quasi Split Sound) demodulation. · AM demodulator without extra reference circuit ·...
  • Page 23 CP-520V Service Manual · FM overmodulation adaptation option to avoid clipping and distortion Audio Multi Channel Decoder (stereo versions with Audio DSP) · Dolby® Pro Logic® (DPL) (1) · Five channel processing for Main Left and Right, Subwoofer, Centre and Surround. To exploit this feature an external DAC is required.

  • Page 24: La42032 Stereo Audio Amplifier

    CP-520V Service Manual · 5 PWM (6-bits) outputs for analogue control functions · Remote Control Pre-processor (RCP) · Universal Asynchronous Receiver Transmitter (UART) Data Capture · Text memory up to 10 pages · Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page Table (SPT) ·...

  • Page 25: Features

    CP-520V Service Manual 4.2.1 FEATURES • 5W x 2 Channel(Vcc=9V, R =8Ω) Standby function • Mute function • Thermal protection circuit • Pin description Symbol Description R.F. Ripple Filter Right input Ground Left Input Standby Mute Mute Supply Voltage Lo(+) Positive Left output Lo(-) Negative Left Output...
  • Page 26 CP-520V Service Manual Block diagram LA42032...

  • Page 27: La78040 Vertical Amplifier

    CP-520V Service Manual 4.3 LA78040 VERTICAL AMPLIFIER The LA78040 are power circuit for use in 90° and 110° colour deflection systems for field frequencies of 25 to 200Hz field frequencies, and for 4:3 and 16/9 picture tubes. The IC contains a vertical deflection output circuit, operating as a high efficiency class G system.
  • Page 28 CP-520V Service Manual Pinning Symbol Description Vin(-) Inverting Input Supply voltage Pump Up Out Pump Up Out -14V -14V Vout Ver. Output Output Stage Vcc Vin(+) Non Inv. Input Block diagram LA78040...

  • Page 29: 24Wc16 - 16 Kb Eeprom

    CP-520V Service Manual 4.4 24WC16 - 16 KB EEPROM Features : § 16 Kbit serial I2C bus EEPROM § 400KHz I2C Bus Compatible § supply voltage : 1.8 V to 6.0 V § Low Power CMOS Technology § 1 Million Erase/Write cycles (minimum) §...

  • Page 30: Str - W6754

    CP-520V Service Manual 4.5 STR - W6754 4.5.1 GENERAL DESCRIPTION The STR-W6754 is a quasi-resonant regulator specifically designed to satisfy the requirements for increased integration and reliability in switch-mode power supplies. It incorporates a primary control and drive circuit with an avalanche-rated power MOSFET. 4.5.2 FEATURES •...

  • Page 31: Pin Description

    CP-520V Service Manual 4.5.4 PIN DESCRIPTION NAME SYMBOL DESCRIPTION Drain MOSFET drain Source/Ground S/GND Ground Supply Power Supply Overload Protection SS/OLP Overload Protection and Soft Start Operation Time set up Constant Voltage Control Signal Input, Feedback Burst mode Oscillation Control Overcurrent Protection Signal Input/ Overcurrent Protection OCP/BD...
  • Page 32 CP-520V Service Manual Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Protection Operation OVP Operation Voltage Turn-off, V 29.9 V 25.5 27.7 29.9 CC(OVP) Maximum ON Time 27.5 32.5 39.0 µs on(max) OLP Operation Voltage SSOLP OLP Operation Current -6.0 µA SSOLP...

  • Page 33: Circuit Description

    CP-520V Service Manual CIRCUIT DESCRIPTION 5.1 BLOCK DIAGRAM...

  • Page 34: Functional Description Of Video Processor

    CP-520V Service Manual 5.2 FUNCTIONAL DESCRIPTION OF VIDEO PROCESSOR 5.2.1 Vision IF amplifier The vision IF amplifier can demodulate signals with positive and megative modulation. The PLL demodulator is completely alignment-free. The VCO of the PLL circuit is internal and the grequency is fixed to the required value by using the clock ftequency of the TCG u-Controller as a reference.

  • Page 35: Audio Input Selector And Volume Contro

    CP-520V Service Manual applied to obtain sufficient selectivity (the sound input can be activated by means of the setting of CMB2-CMB0 bits in subaddress 4AH). The setting to the wanted frequency is realised by means of the control bits FMA, FMB and FMC in the control bit 33H. From the output status bytes it can be read whether the PL Lfrequency is inside or outside the window and whether thePLL is in lock or not.

  • Page 36: Synchronisation Circuit

    CP-520V Service Manual The Ics have 3 inputs for external CVBS signals. All CVBS inputs can be used as Y input for the insertion of Y/C signals.However, the CVBS(Y)2 input has to be combined with the C3 input. It is possible to add and extra CVBS(Y/C) input via the pins which are intended to be used for YUV interface (or RGB/YPrPb input).

  • Page 37: Horizontal And Vertical Drive

    CP-520V Service Manual available on one of the other CVBS inputs.In this condition the connections between the vision IF amplifier and the synchronisation circuit can be switched on and off by means of the VDX bit. The VDXEN bit must be set to “1” for this mode. The vertical synchronisation is realised by means of a divider circuit.

  • Page 38: Colour Decoder

    CP-520V Service Manual The circuit contains the following picture improvement features: n Peaking control circuit. The peaking function can be activated for all incoming CVBS, Y/C and RGB/YPrPb signals. Various parameters of the peaking circuit can be adapted by means of the I2C-bus.

  • Page 39: Rgb Output Circuit

    CP-520V Service Manual The SECAM decoder contains an auto-calibrating PLL demodulator which has two references, viz: the divided reference frequency (obtained from the-Controller) which is used to tune the PLL to the desired free-running frequency and the bandgap reference to obtain the correct absolute value of the output signal.
  • Page 40 CP-520V Service Manual WPR(GB) ‘0’ Max 64 ‘0’ ‘0’ ‘0’ Max 60 CCC-gain Max 126 R(GB)-gain Max 126 The setting of the gain registers of the 3 channels can be stored during switch off and can be loaded again during switch-on so that the drive conditions are maintained. When required the operation of the CCC system can be changed into a one-point black current system.

  • Page 41: I2C-Bus User Interface Description

    CP-520V Service Manual 5.2.11 I2C-BUS USER INTERFACE DESCRIPTION The UOC III series is fully controlled via the I2C-bus. Control is exercised by writing data to one or more internal registers. Status information can be read from a set of info registers to enable the controlling microcontroller determine whether any action is required.

  • Page 42: Supported Standards

    CP-520V Service Manual n Automatic decoder configuration and signal routing depending on the selected or detected standard n FM overmodulation adaptation option to avoid clipping and distortion 5.3.1 Supported standards The multistandard capability of the TV Sound Processor covers all terrestrial TV sound standards, FM Radio and satellite FM.

  • Page 43: Functional Description Sound Processor

    CP-520V Service Manual PARAMETER A2/A2* A2+ (KOREA) Pilot frequency 54.6875kHz = 3.5 x line freq. 55.0699 kHz = 3.5 x line freq. Stereo identification frequency 117.5 Hz = line freq / 133 149.9 Hz = line freq / 105 Dual indetification frequency 274.1 Hz = line freq / 57 276.0 Hz = line freq / 57 AM modulation depth...

  • Page 44: Functional Overview Of The Digital Controller Sound Part

    CP-520V Service Manual intercarrier and an external second SIF(2NDSIFEXT), e.g. an intercarrier coming from a PIP frontend. In other applications a 10.7MHz radio IF or satellite FM may be connected to this input. The selected SSIF passes some anti alias filtering, is amplified in an AGC amplifier (SSIF AGC) and is then converted from analogue to digital (SSIF ADC).

  • Page 45: Demodulator And Decoder

    CP-520V Service Manual decoding is done in the DEMDEC block of the Sound DSP. The DEMDEC processing will be described in the next chapter. The audio signals (AUD ADC IN) from the analogue crossbar pass the audio ADC and are fed directly into the AUDIO part of the Sound DSP like the I2S signals, which is coming from I2S processing hardware.
  • Page 46 CP-520V Service Manual output signal of the first demodulator can be used for further demodulation of multiplex signals used in the BTSC, EIAJ and FM Radio standards. FMIDENTIFICATION The identification of the FM sound mode is performed by AM synchronous demodulation of the pilot signal and narrow-band detection of the identification frequencies.
  • Page 47 CP-520V Service Manual number of sound sample errors, resulting from parity checking, that occurred in the past 128ms period. The Bit Error Rate (BER) can be calculated using the following equation; During NICAM mode a switchable J17 de-emphasis is supplied. NICAM AUTO-MUTE If the Auto Standard Detection (ASD) or the Static Standard Detection (SSS) feature is activated the following auto mute function is in effect.

  • Page 48: Service Parts List

    DECO CTRL 21G2 PC T0.25 R411 RS02Y109JS R M-OXIDE FILM 2W 1 OHM J SMALL M561 48556192SD02 MARK BRAND “DAEWOO 68MM (20””21””)” R800 RX07B229JP R CEMENT 7W 2.2 OHM J BEN 15MM 4P M781 4857817610 CLOTH BLACK “300 MM 20”””...
  • Page 49 CP-520V Service Manual z_loc z_parts_code parts_name parts_descr remark z_loc z_parts_code parts_name parts_descr remark C405 CCXB2H561K C CERA 500V B 560PF K (TAPPING) F801B 4857415001 CLIP FUSE PFC5000-0702 C406 CEXF2C109V C ELECTRO 160V RSS 1MF (6.3*11) TP I803 1K1A431B— IC REGULATOR(SHUNT) KIA431B 2.495V 0.5% TO-92 C409 CXSL2H470J...
  • Page 50 CP-520V Service Manual z_loc z_parts_code parts_name parts_descr remark z_loc z_parts_code parts_name parts_descr remark C546 CCZJ1H104Z C CERA 50V F 0.1MF Z AXL (1608) DA02 DTZX5V6B— DIODE ZENER TZX5V6B (TAPPING) C550 CCZJ1H103Z C CERA 50V F 0.01MF Z AXL (1608) DA03 85801060GY WIRE COPPER 1/0.6 TIN COATING...
  • Page 51 CP-520V Service Manual z_loc z_parts_code parts_name parts_descr remark z_loc z_parts_code parts_name parts_descr remark J071 85801060GY WIRE COPPER 1/0.6 TIN COATING R101 RD-2Z332J- R CARBON FILM 1/2 3.3K OHM J J072 85801060GY WIRE COPPER 1/0.6 TIN COATING R104 RD-AZ101J- R CARBON FILM 1/6 100 OHM J J073 85801060GY...
  • Page 52 CP-520V Service Manual z_loc z_parts_code parts_name parts_descr remark z_loc z_parts_code parts_name parts_descr remark R565 RD-AZ154J- R CARBON FILM 1/6 150K OHM J R903 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R566 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R907 RD-AZ271J- R CARBON FILM...

  • Page 53: Exploded View

    7. Exploded View CP-520V Service Manual 7-1 DTX-21G2...

  • Page 54: Dtx-21B4

    Exploded View CP-520V Service Manual 7-2 DTX-21B4...

  • Page 55: Dtx-21U7

    Exploded View CP-520V Service Manual 7-3 DTX-21U7...

  • Page 56: Printed Circuit Board

    8. Printed Circuit Board CP-520V Service Manual 8.1 4859813693 (OLD PCB)

  • Page 57: 4859816393(New Pcb)

    Printed Circuit Board CP-520V Service Manual 8.2 4859816393 (NEW PCB)

  • Page 58: Schematic Diagram

    9. Schematic Diagram CP-520V Service Manual...
  • Page 59 DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG, MAPO-GU, SEOUL, KOREA. C.P.O. BOX 8003 SEOUL KOREA PRINTED DATE : Dec. 2006...

This manual is also suitable for:

Dtx-21b4Dtx-21u7

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