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Daewoo DTX-21G2 Service Manual Download Page 30

CP-520

V 

Service Manual 

 

29

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 

 

 

 

 

 

4.5.3 BLOCK DIAGRAM 

 

• Auto-Bias Function Stable Burst Operation Without Generating Interference

• Internal Off-Timer Circuit

• Built-In Constant-Voltage Drive

• Multiple Protections: Pulse-by-Pulse Overcurrent Protection

  Overload Protection with Auto Recovery

  Latching Overvoltage Protection

  Undervoltage Lockout with Hysteresis

• RoHS Compliant

Summary of Contents for DTX-21G2

Page 1: ...g 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 Service Manual COLOR Television CHAS...

Page 2: ...VM DEFAULT SETTING 12 3 7 TV SET ALIGNMENT 14 3 7 1 G2 ALIGNMENT 14 3 7 2 WHITE BALANCE 14 3 7 3 FOCUS 14 3 7 4 VERTICAL GEOMETRY 14 3 7 5 HORIZONTAL PICTURE CENTRING 14 3 7 6 AGC 14 4 IC DESCRIPTION...

Page 3: ...6 5 2 8 Chroma luminance and feature processing 36 5 2 9 Colour decoder 37 5 2 10 RGB output circuit 38 5 2 11 I2C BUS USER INTERFACE DESCRIPTION 40 5 3 GENERAL DESCRIPTION OF THE TV SOUND OF SOUND PR...

Page 4: ...CP 520V Service Manual 3 DOCUMENT HISTORY VERSION DATE COMMENTS V1 46 07 07 06 Creation of document Author JS KIM for project CP520 50Hz TV...

Page 5: ...em Visual screen size 51cm Channel indication On Screen Display Program Selection 100 programmes Aux terminal EURO SCART 1 Audio Video In and Out R G B In Slow and Fast switching EURO SCART 2 Audio Vi...

Page 6: ...Video Input 1 Vpp 3dB Impedance 75 21 Common Earth 1 1 3 EURO SCART 2 21 Pin Pin Signal Description Matching value 1 Audio Output Right 0 5 Vrms Impedance 1 k RF 54 Mod 2 Audio Input Right 0 5 Vrms Im...

Page 7: ...0 C21 471 25 471 25 471 25 471 25 C22 479 25 479 25 479 25 479 25 C23 487 25 487 25 487 25 487 25 C24 495 25 495 25 495 25 495 25 C25 503 25 503 25 503 25 503 25 C26 511 25 511 25 511 25 511 25 C27 51...

Page 8: ...25 815 25 815 25 815 25 C65 823 25 823 25 823 25 823 25 C66 831 25 831 25 831 25 831 25 C67 839 25 839 25 839 25 839 25 C68 847 25 847 25 847 25 847 25 C69 855 25 855 25 855 25 855 25 C70 863 25 863 2...

Page 9: ...43 25 S27 351 25 351 25 351 25 351 25 S28 359 25 359 25 359 25 359 25 S29 367 25 367 25 367 25 367 25 S30 375 25 375 25 375 25 375 25 S31 383 25 383 25 383 25 383 25 S32 391 25 391 25 391 25 391 25 S3...

Page 10: ...ischarge 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 If any Fuse in this TV receiver i...

Page 11: ...Increment the values within range Cycle trough option bits OK key Toggle bits in option byte Order Item Default setting 1 HOR CEN 2 RED GAIN 3 GRN GAIN 4 BLUE GAIN 5 RED BIAS 6 GRN BIAS 7 AGC LEVEL 8...

Page 12: ...ps 01 Not used 10 Alps LG 11 Parstnic SS 3 5 OPTION 2 B7 B6 B5 B4 B3 B2 B1 B0 1 JVC remote control AVL control OFF PICTURE TILT ON 5 keys local keyboard Full ATSS Double Window Enabled 0 Fixed to 0 Da...

Page 13: ...V set 3 Entering into NVM EDITOR mode To switch the TV set into NVM EDITOR mode use the user remote control and press on PICTURE OK key The NVM EDITOR window will appear on the screen This mode allow...

Page 14: ...x2E 14 Nor1_Colour 0x64C 0x1C 15 Nor1_Sharpness 0x64D 0x23 16 Nor1_Tint 0x64E 0x20 17 Nor1_JVC_Bri 0x64F 0x2D 18 Nor1_JVC_Cont 0x650 0x2A 19 Nor1_JVC_Colour 0x651 0x1B 20 Nor1_JVC_Sharp 0x652 0x23 21...

Page 15: ...7 4 VERTICAL GEOMETRY Adjust V LINEAR linearity S CORRECT S Correction VERT SIZE Vertical amplitude VERT CENT vertical centring to compensate for vertical distortion 3 7 5 HORIZONTAL PICTURE CENTRING...

Page 16: ...t memory Multi standard stereo decoder BTSC stereo decoder Digital sound processing circuit Digital video processing circuit 4 1 1 IC MARKING AND VERSION Chassis IC marking OSD languages ATSS countrie...

Page 17: ...CP 520V Service Manual 16 4 1 2 BLOCK DIAGRAM...

Page 18: ...bus data line 21 P1 6 SCL port 1 6 or I2C bus clock line 22 P1 3 T1 port 1 3 or Counter Timer 1 input 23 P0 0 I2SDI1 O port 0 0 or I2S digital input 1 or I2S digital output 24 P0 1 I2SDO1 port 0 1 or...

Page 19: ...O CSY flyback input sandcastle output or composite H V timing output 64 SVM scan velocity modulation output 65 CVBSO PIP CVBS PIP output 66 AUDOUTHPR audio output for headphone channel right signal 67...

Page 20: ...F amplifier 102 IREF reference current input 103 VSC vertical sawtooth capacitor 104 VIFIN2 IF input 2 105 VIFIN1 IF input 1 106 VDRA vertical drive A output 107 VDRB vertical drive B output 108 EWD A...

Page 21: ...s forced mode possibilities Internal base band delay line Indication of the Signal to Noise ratio of the incoming CVBS signal Linear RGB YPBPR input with fast insertion YUV interface When this feature...

Page 22: ...reo SPEAKER output with digital controls AVL Automatic Volume Levelling circuit for the headphone channel Digital input crossbar switch for all digital signal sources and destinations Digital output c...

Page 23: ...channels stereo versions with Audio DSP Extended Pseudo Stereo EPS 5 Extended Spatial Stereo ESS 6 Virtual Dolby Surround VDS 422 423 1 SRS 3D and SRS TruSurround 4 RDS RBDS Demodulation of the Europ...

Page 24: ...nd Enhanced OSD modes Features of level 1 5 WST and US Close Caption 50Hz 60Hz display timing modes Two page operation for 16 9 screens Serial and Parallel Display Attributes Single Double Quadruple W...

Page 25: ...iption 1 R F Rin GND Lin STB Mute Vcc Lo Lo GND Ro Ro N C Ripple Filter 2 Right input 3 Ground 4 Left Input 5 Standby 6 Mute 7 Supply Voltage 8 Positive Left output 9 Negative Left Output 10 Ground 11...

Page 26: ...CP 520V Service Manual 25 Block diagram LA42032...

Page 27: ...re tubes The IC contains a vertical deflection output circuit operating as a high efficiency class G system The full bridge output circuit allows DC coupling of the deflection coil in combination with...

Page 28: ...ervice Manual 27 Pinning Pin Symbol Description 1 Vin Inverting Input 2 Vcc Supply voltage 3 Pump Up Out Pump Up Out 4 14V 14V 5 Vout Ver Output 6 Vcc Output Stage Vcc 7 Vin Non Inv Input Block diagra...

Page 29: ...ress Input Output 6 SCL Serial clock 7 WP Write control 8 Vcc Supply voltage 4 Vss Ground The memory device is compatible with the I2C memory standard This is a two wire serial interface that uses a b...

Page 30: ...incorporates a primary control and drive circuit with an avalanche rated power MOSFET 4 5 2 FEATURES 4 5 3 BLOCK DIAGRAM Auto Bias Function Stable Burst Operation Without Generating Interference Inter...

Page 31: ...8 8 9 7 10 6 V Circuit Current in Non Operation ICC OFF VCC A 0 0 1 V 5 1 Normal Operation Drain Source Breakdown Voltage V BR DSS ID V 0 5 6 A 0 0 3 Drain Leakage Current IDSS VDS A 0 0 3 V 0 5 6 On...

Page 32: ...5 8 V OLP Operation Current ISSOLP 6 0 11 16 A Overcurrent Detect Threshold Volt VOCPBD LIM 0 895 0 940 0 995 V OCP BD Pin Current IOCPBD 40 100 250 A Latch Holding Current ICC H VCC 29 9 VCC OFF 0 3...

Page 33: ...CP 520V Service Manual 32 5 CIRCUIT DESCRIPTION 5 1 BLOCK DIAGRAM...

Page 34: ...ealisedbyamultiplier In this multiplier the SIF signal is converted to the intercarrier frequency by mixing it with the regenerated picture carrier from the VCO The mixer output signal is suppliedtoth...

Page 35: ...on is made with the bits SAS2 0 SO2 0 and HPO2 0 AV stereo versions without Audio DSP have no headphone output The input signal selection for the volumecontrolledaudiooutputsisrealisedbytheHPO2 0 bits...

Page 36: ...of the displayed picture the input signal of the sync separator is not derived from the various CVBS Y or RGB YPrPb inputs but from the YOUT pin For this reason the YOUT pin must be capacitively coup...

Page 37: ...Vertical shift n Vertical zoom n Vertical scroll n Vertical linearity correction When required the linearity setting for the upper and lower part of the screen can have a different setting n Horizont...

Page 38: ...ic skin tone flesh control This function is realised in the YUV domain by detecting the colours near to the skin tone n Scan Velocity modulation output Also the SVM function can be activated for all i...

Page 39: ...e to th edigita ldie Via this loop digital features like double window are added A tint control is available for the base band U V signals For this reason this tint control can be activated for all co...

Page 40: ...cation can be read from the status byte 01 and can be used for automatic adjustment of the Vg2 voltage during the production of the TV receiver During this test the vertical scan remains active so tha...

Page 41: ...ia auto increment mode no address can be used and all registers must be read 5 3 GENERAL DESCRIPTION OF THE TV SOUND OF SOUND PROCESSOR The TV Sound Processor is a digital TV sound processor for analo...

Page 42: ...r BTSC full dbx performance n SAP demodulation without dbx simultaneously with stereo decoding or mono plus SAP with dbx n Line pilot frequency selectable from 15 734 kHz and 15 625 kHz or automatic d...

Page 43: ...ote1 D K 6 5 FM 27 50 80 5 85 J17 40 Note1 L 6 5 AM 54 100 5 85 J17 40 Note1 Note 1 See EBU specification or equivalent specification 5 4 FUNCTIONAL DESCRIPTION SOUND PROCESSOR 5 4 1 The UOC III TV So...

Page 44: ...EMDEC a digital input crossbar the digital audio processing for the loudspeaker and DAC channels the I2S processing and interfacing a digital output crossbar as well as the DA conversion An auxiliary...

Page 45: ...search for sound carriers and react to transmission mode changes autonomously without interaction of the micro controller software It is possible for a typical terrestrial TV application to setup the...

Page 46: ...A2 stereo dual and mono signals to obtain the left L and right R or language A and B signals FMPILOTCARRIERPRESENTDETECTOR The TV Sound Processor provides FM A2 standard pilot carrier detection NICAMD...

Page 47: ...OERRLIM and NICUPERRLIM When the number of errors in a 128 ms period exceeds the upper error limit the auto mute function will switch the output sound from NICAMtowhateversoundisonthefirstsoundcarrier...

Page 48: ...OWER STR W6754 I801A 4857024600 HEAT SINK AL EX B K I801B 7174300851 SCREW TAPPTITE TT2 RND 3X8 MFZN 3CR I802 1LTV817C IC PHOTO COUPLER LTV 817C I804 1LE33CZ IC REGULATOR LE33CZ IF01 1441VF6 IC PREAMP...

Page 49: ...17 CEXF1A471V C ELECTRO 10V RSS 470MF TAPPING C819 CEXF2C109V C ELECTRO 160V RSS 1MF 6 3 11 TP C820 CMXM2A104J C MYLAR 100V 0 1MF J TP C821 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP C824 CEXF1A471V...

Page 50: ...DE ZENER TZX5V6B TAPPING DA06 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA08 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA09 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA10 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA11 DT...

Page 51: ...COIL PEAKING 10UH 10 5MM K LAL04TB L515 5CPZ100K02 COIL PEAKING 10UH 3 5MM K LAL02TB L516 5CPZ479K02 COIL PEAKING 4 7UH 3 5MM K LAL02TB L523 5CPZ479K02 COIL PEAKING 4 7UH 3 5MM K LAL02TB L601 5CPZ100K...

Page 52: ...6 1K OHM J R810 RC 2Z565KP R CARBON COMP 1 2 5 6M OHM K R811 RN 4Z9102F R METAL FILM 1 4 91 0K OHM F R812 RN 4Z1502F R METAL FILM 1 4 15K OHM F R813 RN 4Z2201F R METAL FILM 1 4 2 2K OHM F R814 RD AZ1...

Page 53: ...CP 520V Service Manual 7 Exploded View 52 7 1 DTX 21G2...

Page 54: ...CP 520V Service Manual Exploded View 53 7 2 DTX 21B4...

Page 55: ...CP 520V Service Manual Exploded View 54 7 3 DTX 21U7...

Page 56: ...CP 520V Service Manual 8 Printed Circuit Board 55 8 1 4859813693 OLD PCB...

Page 57: ...CP 520V Service Manual Printed Circuit Board 56 8 2 4859816393 NEW PCB...

Page 58: ...CP 520V Service Manual 9 Schematic Diagram 57...

Page 59: ...DAEWOO ELECTRONICS CORP PRINTED DATE Dec 2006 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA...

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