Daewoo Dtf 2950 Service Manual
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CP-850FX Service Manual
Europe R&D
4
5.10.2.4
Cancellation of
OLP Circuit........................................................................\
............... 69
5.10.3 FB Terminal (Pin. 6) ........................................................................\
........................... 70
5.10.3.1 Constant Voltage Control Circuit........................................................................\
..... 70
5.10.4 OCP/BD Terminal (Pin 7)...](http://img.usermanuals.tech/thumb/1416/53596/w64_daewoo_dtf-2950-service-manual-4.png "Page 5
CP-850FX Service Manual
Europe R&D
4
5.10.2.4
Cancellation of
OLP Circuit........................................................................\
............... 69
5.10.3 FB Terminal (Pin. 6) ........................................................................\
........................... 70
5.10.3.1 Constant Voltage Control Circuit........................................................................\
..... 70
5.10.4 OCP/BD Terminal (Pin 7)...")
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/M No.TCP850XEF0 CHASSIS : CP-850FX MODEL : DTF-2950-100D DTF-2950GB-100D DTF-2950K-100D SEP.2006
CP-850FX Service Manual Europe R&D 1 CONTENTS DOCUMENT HISTORY ................................................................................................................. 5 1 MAIN FEATURES...................................................................................................................6 1.1 SPECIFICATIONS .............................................................................................................. 6 1.1.1 GENERAL...................................................................................................................... 6 1.1.2 EURO-SCART 1 (21 Pin).............................................................................................. 6 1.1.3 EURO-SCART 2 (21 Pin).............................................................................................. 7 1.2 CHANNEL/FREQUENCY TABLE ....................................................................................... 8 1.3 ATSS SORTING METHOD ............................................................................................... 11 1.3.1 GENERAL CASE......................................................................................................... 11 1.3.2 SPECIAL CASE........................................................................................................... 11 2 SAFETY INSTRUCTION ...................................................................................................... 13 3 ALIGNMENT INSTRUCTIONS ............................................................................................. 14 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE ........................................ 14 3.2 SERVICE MODE NAVIGATION........................................................................................ 14 3.3 MICROCONTROLLER CONFIGURATION : OPTION BITS ............................................. 14 3.3.1 OPTION 1........................................................................................................................ 15 3.3.2 OPTION 2........................................................................................................................ 15 3.3.3 OPTION 3........................................................................................................................ 15 3.4 TV SET ALIGNMENT........................................................................................................ 16 3.4.1 LOCAL OSCILLATOR ALIGNMENT............................................................................... 16 3.4.2 G2 ALIGNMENT.............................................................................................................. 16 3.4.3 WHITE BALANCE........................................................................................................... 16 3.4.4 FOCUS............................................................................................................................ 16 3.4.5 VERTICAL GEOMETRY................................................................................................. 16 3.4.6 HORIZONTAL PICTURE CENTRING............................................................................. 16 3.4.7 EAST / WEST CORRECTION......................................................................................... 16 3.4.8 AGC................................................................................................................................17 4 IC DESCRIPTION.................................................................................................................18 4.1 TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER................................... 18 4.1.1 BLOCK DIAGRAM OF THE SDA55XX........................................................................ 18 4.1.2 DESCRIPTION............................................................................................................ 18 4.1.3 IC MARKING AND VERSION...................................................................................... 19 4.1.4 PINNING...................................................................................................................... 19 4.2 VSP94X5B (VERSION C4)– OPTIMUS COLOR DECODER AND SCAN-RATE CONVERTER.................................................................................................................... 21 4.2.1 BLOCK DIAGRAM OF THE VSP94x5B...................................................................... 21 4.2.2 Feature Overview........................................................................................................ 22 4.2.3 PINNING...................................................................................................................... 23 4.3 DDP 3315C – DISPLAY AND DEFLECTION PROCESSOR ............................................ 25 4.3.1 BLOCK DIAGRAM OF THE DDP 3315C..................................................................... 25 4.3.2 DESCRIPTION............................................................................................................ 25 4.3.3 PINNING...................................................................................................................... 27 4.4 MSP341X MULTISTANDARD SOUND PROCESSOR ..................................................... 29 4.4.1 BASIC FEATURES OF THE MSP 341X...................................................................... 29 4.4.1.1 Demodulator & NICAM Decoder Section .................................................................. 29 4.4.1.2 DSP-Section (Audio Baseband Processing)............................................................. 30 4.4.1.3 Analogue Section...................................................................................................... 30 4.4.1.4 NICAM & FM/AM-Mono ............................................................................................ 30
CP-850FX Service Manual Europe R&D 2 4.4.1.5 German 2-Carrier System (DUAL FM System) ......................................................... 30 4.5 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR....... 33 4.5.1 DESCRIPTION............................................................................................................ 33 4.5.2 FEATURES.................................................................................................................. 33 4.5.3 PINNING...................................................................................................................... 33 4.5.4 BLOCK DIAGRAM....................................................................................................... 34 4.6 TDA8946J STEREO AUDIO AMPLIFIER ......................................................................... 35 4.6.1 FEATURES.................................................................................................................. 35 4.7 TDA8358J VERTICAL AMPLIFIER ................................................................................... 37 4.7.1 FEATURES.................................................................................................................. 37 4.8 TDA6108JF .......................................................................................................................39 4.9 24C16 - 16 KB EEPROM .................................................................................................. 40 4.10 STR – W6754....................................................................................................................41 4.10.1 GENERAL DESCRIPTION........................................................................................ 41 4.10.2 FEATURES................................................................................................................ 41 4.10.3 BLOCK DIAGRAM..................................................................................................... 41 4.10.4 PIN DESCRIPTION................................................................................................... 42 4.10.5 MOSFET ELECTRICAL CHARACTERISTICS.......................................................... 42 4.10.6 ELECTRICAL CHARACTERISTICS.......................................................................... 43 5 CP-850FX CHASSIS DESCRIPTION ................................................................................... 44 5.1 POWER SUPPLY BLOCK DIAGRAM............................................................................... 44 5.2 VIDEO & STEREO AUDIO BLOCK DIAGRAM ................................................................. 45 5.3 IF SECTION ......................................................................................................................46 5.3.1 BLOCK DIAGRAM....................................................................................................... 46 5.3.2 VISION IF AMPLIFIER................................................................................................ 47 5.3.3 TUNER-AND VIF-AGC................................................................................................ 47 5.3.4 FPLL, VCO AND AFC.................................................................................................. 47 5.3.5 VIDEO DEMODULATION AND AMPLIFIER............................................................... 48 5.3.6 SOUND IF AMPLIFIER AND SIF-AGC........................................................................ 48 5.3.7 QUASI-PARALLEL-SOUND (QPS) MIXER................................................................. 48 5.3.8 STANDARD SWITCH.................................................................................................. 48 5.3.9 L’ SWITCH................................................................................................................... 48 5.3.10 INTERNAL VOLTAGE STABILISER......................................................................... 48 5.4 VIDEO / RGB ....................................................................................................................48 5.4.1 FRONT END................................................................................................................ 48 5.4.1.1 CVBS Front-End ....................................................................................................... 48 5.4.1.2 Input Selector............................................................................................................ 49 5.4.1.3 Signal Levels And Gain Control ................................................................................ 49 5.4.1.4 Synchronization ........................................................................................................ 49 5.4.1.5 Chroma Decoder ...................................................................................................... 49 5.4.1.6 Luminance Processing.............................................................................................. 49 5.4.1.7 RGB Front-End......................................................................................................... 49 5.4.1.8 Signal Processing..................................................................................................... 49 5.3.1.8.1 Horizontal Prescaler............................................................................................... 49 5.3.1.8.2 Noise Reduction..................................................................................................... 50 5.3.1.8.3 Noise Measurement ............................................................................................... 50 5.3.1.8.4 Operation Modes ................................................................................................... 50 5.3.1.8.5 Digital 656 Output .................................................................................................. 50 5.4.2 BACK END.................................................................................................................. 50 5.4.2.1 Digital Input Interface ................................................................................................ 50 5.4.2.2 Horizontal Scaler...................................................................................................... 50 5.4.2.3 Luma Contrast and Brightness ................................................................................. 51
CP-850FX Service Manual Europe R&D 3 5.4.2.4 Black Level Expander/Compressor (BLEC) .............................................................. 51 5.4.2.5 Luma Sharpness Enhancer (LSE) ............................................................................ 51 5.4.2.6 Dynamic Peaking...................................................................................................... 51 5.4.2.7 Luma Transient Improvement (LTI) .......................................................................... 51 5.4.2.8 Mixing of Dynamic Peaking and LTI ......................................................................... 51 5.4.2.9 Chroma Transient Improvement ............................................................................... 51 5.4.2.10 Analog Back End .................................................................................................... 53 5.4.2.11 Analog RGB Insertion ............................................................................................. 53 5.4.2.12 CRT Measurement and Control .............................................................................. 53 5.4.2.13 Synchronization and Deflection .............................................................................. 54 5.4.2.14 EHT Compensation ................................................................................................ 54 5.5 MICRONTROLLER........................................................................................................... 54 5.5.1 MICROCONTROLLER FEATURES............................................................................ 54 5.5.2 ACQUISITION FEATURES......................................................................................... 54 5.5.3 PORTS........................................................................................................................ 55 5.5.4 μ-CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE..................... 55 5.5.5 TUNING....................................................................................................................... 55 5.5.6 AUTOMATIC PICTURE FORMAT SWITCHING......................................................... 56 5.5.6.1 WSS Data ................................................................................................................. 56 5.5.6.2 SCART Pin 8 Data (Slow Switching)........................................................................ 57 5.5.6.3 Picture Format Description ....................................................................................... 57 5.3.1.8.1 16:9 CRT ...............................................................................................................57 5.3.1.8.2 4:3 CRT................................................................................................................. 58 5.5.7 EXTERNAL SOURCE CONTROL LOGIC................................................................... 59 5.5.8 OVER CURRENT PROTECTION................................................................................ 60 5.6 TELETEXT DISPLAY........................................................................................................ 60 5.7 SOUND PROCESSING .................................................................................................... 61 5.7.1 ANALOGUE SOUND IF - INPUT SECTION............................................................... 61 5.7.2 QUADRATURE MIXERS............................................................................................. 61 5.7.3 PHASE AND AM DISCRIMINATION........................................................................... 61 5.7.4 NICAM DECODER...................................................................................................... 62 5.7.5 DSP SECTION............................................................................................................ 62 5.7.6 SOUND MODE SWITCHING....................................................................................... 62 5.8 SOUND AMPLIFICATION ................................................................................................. 62 5.8.1 POWER AMPLIFIER................................................................................................... 62 5.8.2 MODE SELECTION..................................................................................................... 63 5.9 VERTICAL DEFLECTION ................................................................................................. 63 5.9.1 FLYBACK VOLTAGE.................................................................................................. 63 5.9.2 PROTECTION............................................................................................................. 63 5.9.3 GUARD CIRCUIT........................................................................................................ 63 5.9.4 DAMPING RESISTOR................................................................................................. 63 5.9.5 EAST-WEST AMPLIFIER............................................................................................ 63 5.10 POWER SUPPLY (STR-W6754) - FUNCTIONS OF EACH TERMINAL .......................... 64 5.10.1 Vcc Terminal (Pin 4)................................................................................................... 64 5.10.1.1 Start-up Circuit ........................................................................................................ 64 5.10.1.2 Auxiliary/Drive Winding ........................................................................................... 65 5.10.1.3 Overvoltage Protection Circuit ................................................................................ 66 5.10.1.4 Latch Circuit............................................................................................................ 67 5.10.2 SS/OLP Terminal (Pin 5).......................................................................................... 67 5.10.2.1 Soft-Start Operation at Start-up of Power Supply ................................................... 67 5.10.2.2 Overload Protection ................................................................................................ 68 5. 10. 2. 3 Operation at Power Supply OFF ........................................................................... 69
CP-850FX Service Manual Europe R&D 4 5.10.2.4 Cancellation of OLP Circuit........................................................................\ ............... 69 5.10.3 FB Terminal (Pin. 6) ........................................................................\ ........................... 70 5.10.3.1 Constant Voltage Control Circuit........................................................................\ ..... 70 5.10.4 OCP/BD Terminal (Pin 7) ........................................................................\ ................... 71 8.4.1. Minus-Detection Type OCP Circuit ........................................................................\ ..... 71 5.10.5 Quasi-Resonant and Bottom-Skip Operation ............................................................. 72 5.10. 5. 1 Quasi-Resonant Operation ........................................................................\ ............. 72 5.10.5.2 Bottom-Skip Operation (Switching fr om Quasi-Resonant Operation) ..................... 73 1). Quasi-Resonant Operation ⇒ Bottom-Skip O peration ............................................. 73 2). Bottom-Skip Operation ⇒ Quasi-Resonant Operation ............................................... 73 5.10.6 Stand-By Operation ........................................................................\ ........................... 74 5.10.7 Step-Drive Circuit........................................................................\ ............................... 76 5.10.8 Maximum ON Time Controlling Function ................................................................... 76 6 SERVICE PARTS LIST ........................................................................\ ............................... .7 7 6.1 DTF- 2950 ........................................................................\ ............................................... ... 77 7 EXPLODED VIEW........................................................................\ ....................................... .85 7. 1 DTF -295 0........................................................................\ .............................................. ... .85 8 PRINTED CIRCU IT BOAR D........................................................................\ ........................ .86 8. 1 MAIN PC B........................................................................\ .............................................. .. . 86 8.2 UNION PCB ........................................................................\ ............................................. ....... .87 8. 3 CRT PCB ........................................................................\ ............................................... .. . 88 9 SCHEMATIC D IAGRA M........................................................................\ .............................. .89 9. 1 MAI N........................................................................\ .................................................. ...... .89 9. 2 UNION & CR T........................................................................\ .......................................... .90
CP-850FX Service Manual Europe R&D 5 DOCUMENT HISTORY VERSION DATE COMMENTS V1.00 31/07/06 Creation of document (Author JS KIM) for project CP-850FX 100Hz TV.
CP-850FX Service Manual Europe R&D 6 1 MAIN FEATURES 1.1 SPECIFICATIONS 1.1.1 GENERAL TV standard PAL/SECAM-B/G, D/K, PAL-I/I, SECAM-L/L’ Tuner PAL, SECAM Colour system AV 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 105W Sound Output Power 7W x 2 (at 60% mod, 10%THD) Speaker 12W 8 ohm x2 Teletext system 9 pages memory FASTEXT (FLOF or TOP) Aerial input 75 ohm unbalanced Channel coverage Off-air channels, S-cable channels and hyperband Tuning system frequency synthesiser tuning system Visual screen size 68cm 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 / Video In and Out, SVHS In. AV3 : Audio-Video Jack on side of cabinet. Headphone jack (3.5 mm) on side of cabinet SVHS3 : Jack on side of cabinet – sound input common with AV3. Remote Control Unit R-49C10(AAA) 1.1.2 EURO-SCART 1 (21 Pin) Pin Signal Description Matching value 1 Audio Output Right 0.5 Vrms, Impedance < 1 kΩ, ( RF 54% Mod ) 2 Audio Input Right 0.5 Vrms, Impedance > 10 kΩ 3 Audio Output Left 0.5 Vrms, Impedance < 1 kΩ, ( RF 54% Mod ) 4 Audio Earth 5 Blue Earth 6 Audio Input Left 0.5 Vrms, Impedance > 10 kΩ 7 Blue Input 0.7 Vpp ±0.1V, Impedance 75Ω 8 Slow Switching TV : 0 to 2V, AV 16/9 : 4.5 to 7V, AV 4/3 : 9.5 to 12V , Impedance > 10 kΩ 9 Green Earth
CP-850FX Service Manual Europe R&D 7 10 N.C. 11 Green Input 0.7 Vpp ± 0.1V, Impedance 75Ω 12 N.C. 13 Red Earth 14 Blanking Earth 15 Red Input 0.7 Vpp ± 0.1V, Impedance 75Ω 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 1.1.3 EURO-SCART 2 (21 Pin) Pin Signal Description Matching value 1 Audio Output Right 0.5 Vrms, Impedance < 1 kΩ, ( RF 54% Mod ) 2 Audio Input Right 0.5 Vrms, Impedance > 10 kΩ 3 Audio Output Left 0.5 Vrms, Impedance < 1 kΩ, ( RF 54% Mod ) 4 Audio Earth 5 Earth 6 Audio Input Left 0.5 Vrms, Impedance > 10 kΩ 7 N.C. 8 Slow Switching TV : 0 to 2V, AV 16/9 : 4.5 to 7V, AV 4/3 : 9.5 to 12V , Impedance > 10 kΩ 9 Earth 10 N.C. 11 N.C. 12 N.C. 13 Earth 14 Earth 15 Chroma Input ± 3dB for a luminance signal of 1 Vpp 16 N.C. 17 Earth 18 Video In Earth 19 Video Output 1 Vpp ± 3dB, Impedance 75Ω ( Monitor output ) 20 Video Input, Y In. 1 Vpp ± 3dB, Impedance 75Ω 21 Common Earth
CP-850FX Service Manual Europe R&D 8 1.2 CHANNEL/FREQUENCY TABLE CHANNEL EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT C01 46.25 - 45.75 49.75 C02 48.25 55.75 (L) 53.75 59.25 C03 55.25 60.5 (L) 61.75 77.25 C04 62.25 63.75 (L) 175.25 85.25 C05 175.25 176.00 183.25 93.25 C06 182.25 184.00 191.25 175.25 C07 189.25 192.00 199.25 183.25 C08 196.25 200.00 207.25 191.25 C09 203.25 208.00 215.25 199.25 C10 210.25 216.00 223.25 207.25 C11 217.25 189.25 (LUX) 231.25 215.25 C12 224.25 69.25 (L) 239.25 223.25 C13 53.75 76.25 (L) 247.25 - C14 - 83.25 (L) 49.75 - C15 82.25 90.25 57.75 - C16 - 97.25 65.75 - C17 183.75 - 77.75 - C18 192.25 - 85.75 - C19 201.25 - - - C20 - - - - 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 519.25 519.25 519.25 519.25 C28 527.25 527.25 527.25 527.25 C29 535.25 535.25 535.25 535.25 C30 543.25 543.25 543.25 543.25 C31 551.25 551.25 551.25 551.25 C32 559.25 559.25 559.25 559.25 C33 567.25 567.25 567.25 567.25 C34 575.25 575.25 575.25 575.25 C35 583.25 583.25 583.25 583.25 C36 591.25 591.25 591.25 591.25 C37 599.25 599.25 599.25 599.25 C38 607.25 607.25 607.25 607.25 C39 615.25 615.25 615.25 615.25 C40 623.25 623.25 623.25 623.25 C41 631.25 631.25 631.25 631.25 C42 639.25 639.25 639.25 639.25 C43 647.25 647.25 647.25 647.25 C44 655.25 655.25 655.25 655.25 C45 663.25 663.25 663.25 663.25 C46 671.25 671.25 671.25 671.25
CP-850FX Service Manual Europe R&D 9 C47 679.25 679.25 679.25 679.25 C48 687.25 687.25 687.25 687.25 C49 695.25 695.25 695.25 695.25 C50 703.25 703.25 703.25 703.25 C51 711.25 711.25 711.25 711.25 C52 719.25 719.25 719.25 719.25 C53 727.25 727.25 727.25 727.25 C54 735.25 735.25 735.25 735.25 C55 743.25 743.25 743.25 743.25 C56 751.25 751.25 751.25 751.25 C57 759.25 759.25 759.25 759.25 C58 767.25 767.25 767.25 767.25 C59 775.25 775.25 775.25 775.25 C60 783.25 783.25 783.25 783.25 C61 791.25 791.25 791.25 791.25 C62 799.25 799.25 799.25 799.25 C63 807.25 807.25 807.25 807.25 C64 815.25 815.25 815.25 815.25 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 863.25 863.25 863.25 863.25 C71 69.25 - - - C72 76.25 - - - C73 83.25 - - - C74 90.25 - - - C75 97.25 - - - C76 59.25 - - - C77 93.25 - - - S01 105.25 104.75 103.25 105.25 S02 112.25 116.75 111.25 112.25 S03 119.25 128.75 119.25 119.25 S04 126.25 140.75 127.25 126.25 S05 133.25 152.75 135.25 133.25 S06 140.25 164.75 143.25 140.25 S07 147.25 176.75 151.25 147.25 S08 154.25 188.75 159.25 154.25 S09 161.25 200.75 167.25 161.25 S10 168.25 212.75 - 168.25 S11 231.25 224.75 - 231.25 S12 238.25 236.75 - 238.25 S13 245.25 248.75 255.25 245.25 S14 252.25 260.75 263.25 252.25 S15 259.25 272.75 271.25 259.25 S16 266.25 284.75 279.25 266.25 S17 273.25 296.75 287.25 273.25 S18 280.25 136.00 295.25 280.25