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User manual DAEWOO DTH-2881 - SERVICE MANUAL
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Manual abstract: user guide DAEWOO DTH-2881 - SERVICE MANUAL
Detailed instructions for use are in the User's Guide. S/M No.TCP830FEF0
CHASSIS : CP-830F
MODEL : DTH-29U7 DTH-29U8 DTH-2881 DTH-28W8 DTH-28W9
OTC 2003
CP830F 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 1.3 ATSS SORTING METHOD 1.3.1 GENERAL CASE 1.3.2 SPECIAL CASE 2 SAFETY INSTRUCTION 3 ALIGNMENT INSTRUCTIONS 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE 3.2 SERVICE MODE NAVIGATION 3.3 MICROCONTROLLER CONFIGURATION : OPTION BITS 3.3.1 OPTION 1 3.3.2 OPTION 2 3.4 TV SET ALIGNMENT 3.4.1 LOCAL OSCILLATOR ALIGNMENT 3.4.2 G2 ALIGNMENT 3.4.3 WHITE BALANCE 3.4.4 FOCUS 3.4.5 VERTICAL GEOMETRY 3.4.6 HORIZONTAL PICTURE CENTRING 3.4.7 EAST / WEST CORRECTION 3.4.8 AGC 4 IC DESCRIPTION 4.1 TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER 4.1.1 BLOCK DIAGRAM OF THE SDA55XX 4.1.2 DESCRIPTION 4.1.3 IC MARKING AND VERSION 4.1.4 PINNING 4.2 VSP9412A - SCAN RATE CONVERTER INCLUDING MULTISTANDARD COLOUR DECODER 4.2.1 BLOCK DIAGRAM OF THE VSP9412A 4.2.2 DESCRIPTION 4.2.3 PINNING 4.3 DDP 3315C - DISPLAY AND DEFLECTION PROCESSOR 4.3.1 BLOCK DIAGRAM OF THE DDP 3315C 4.3.2 DESCRIPTION 4.3.3 PINNING 4.4 MSP341X MULTISTANDARD SOUND PROCESSOR 4.4.1 BASIC FEATURES OF THE MSP 341X 4.4.1.1 Demodulator & NICAM Decoder Section 4.4.1.2 DSP-Section (Audio Baseband Processing)
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5 5 5 5 5 6 7 10 10 10 12 13 13 13 13 14 14 14 14 14 15 15 15 15 15 16 17 17 17 17 18 18 19 20 20 22 23 24 24 26 28 28 28 29
CP830F Service Manual
4.4.1.3 Analogue Section 4.4.1.4 NICAM & FM/AM-Mono 4.4.1.5 German 2-Carrier System (DUAL FM System) 4.5 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR 4.5.1 DESCRIPTION 4.5.2 FEATURES 4.5.3 PINNING 4.5.4 BLOCK DIAGRAM 4.6 TDA894XJ STEREO AUDIO AMPLIFIER 4.6.1 FEATURES 4.7 TDA835XJ VERTICAL AMPLIFIER 4.7.1 TDA8357J 4.7.2 TDA8358J 4.8 TDA6107Q 4.9 24C16 - 16 KB EEPROM 4.10 STR - F6654 4.10.1 GENERAL DESCRIPTION 4.10.2 FEATURES 4.10.3 BLOCK DIAGRAM 4.10.4 PIN DESCRIPTION 4.10.5 CONTROL PART - ELECTRICAL CHARACTERISTICS 4.10.6 MOSFET ELECTRICAL CHARACTERISTICS 5 CP830 CHASSIS DESCRIPTION 5.1 BLOCK DIAGRAM 5.2 IF SECTION 5.2.1 BLOCK DIAGRAM 5.2.2 VISION IF AMPLIFIER 5.2.3 TUNER-AND VIF-AGC 5.2.4 FPLL, VCO AND AFC 5.2.5 VIDEO DEMODULATION AND AMPLIFIER 5.2.6 SOUND IF AMPLIFIER AND SIF-AGC 5.2.7 QUASI-PARALLEL-SOUND (QPS) MIXER 5.2.8 STANDARD SWITCH 5.2.9 L SWITCH 5.2.10 INTERNAL VOLTAGE STABILISER 5.3 VIDEO / RGB 51 5.3.1 FRONT END 5.3.1.1 CVBS Front-End 5.3.1.2 Input Selector 5.3.1.3 Signal Levels And Gain Control 5.3.1.4 Synchronization 5.3.1.5 Chroma Decoder 5.3.1.6 Luminance Processing 5.3.1.7 RGB Front-End 5.3.1.8 Signal Processing 5.3.1.8.1 Horizontal Prescaler 5.3.1.8.2 Noise Reduction 5.3.1.8.3 Noise Measurement 5.3.1.8.4 Operation Modes
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29 29 29 32 32 32 32 33 34 34 35 35 37 39 40 41 41 41 41 42 42 43 44 44 45 45 46 46 46 47 47 47 47 47 47 47 47 48 48 48 48 48 48 48 48 49 49 49
CP830F Service Manual
5.3.1.8.5 Digital 656 Output 5.3.2 BACK END 5.3.2.1 Digital Input Interface 5.3.2.2 Horizontal Scaler 5.3.2.3 Luma Contrast and Brightness 5.3.2.4 Black Level Expander/Compressor (BLEC) 5.3.2.5 Luma Sharpness Enhancer (LSE) 5.3.2.6 Dynamic Peaking 5.3.2.7 Luma Transient Improvement (LTI) 5.3.2.8 Mixing of Dynamic Peaking and LTI 5.3.2.9 Chroma Transient Improvement 5.3.2.10 Analog Back End 5.3.2.11 Analog RGB Insertion 5.3.2.12 CRT Measurement and Control 5.3.2.13 Synchronization and Deflection 5.3.2.14 EHT Compensation 5.4 MICROCONTROLLER 5.4.1 MICROCONTROLLER FEATURES 5.4.2 ACQUISITION FEATURES 5.4.3 PORTS 5.4.4 -CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE 5.4.5 TUNING 5.4.6 AUTOMATIC PICTURE FORMAT SWITCHING 5.4.6.1 WSS Data 5.4.6.2 SCART Pin 8 Data (Slow Switching) 5.4.6.3 Picture Format Description 5.4.6.3.1 16:9 CRT 5.4.6.3.2 4:3 CRT 5.4.7 EXTERNAL SOURCE CONTROL LOGIC 5.4.8 OVER CURRENT PROTECTION 5.5 TELETEXT DISPLAY 5.6 SOUND PROCESSING 5.6.1 ANALOGUE SOUND IF - INPUT SECTION 5.6.2 QUADRATURE MIXERS 5.6.3 PHASE AND AM DISCRIMINATION 5.6.4 NICAM DECODER 5.6.5 DSP SECTION 5.6.6 SOUND MODE SWITCHING 5.7 SOUND AMPLIFICATION 5.7.1 POWER AMPLIFIER 5.7.2 MODE SELECTION 5.8 VERTICAL DEFLECTION 5.8.1 FLYBACK VOLTAGE 5.8.2 PROTECTION 5.8.3 GUARD CIRCUIT 5.8.4 DAMPING RESISTOR 5.8.5 EAST-WEST AMPLIFIER (TDA8358J ONLY) 5.9 POWER SUPPLY (STR F6654) 5.9.1 STR-F6654 GENERAL DESCRIPTION
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CP830F Service Manual
5.9.2 POWER SUPPLY PRIMARY PART OPERATIONS 5.9.2.1 Start -up Circuit: VIN 5.9.2.2 STR-F6654 Oscillating Operation 5.9.2.3 STR-F6654 Protection Circuits 5.10 TV START-UP, TV NORMAL RUN AND STAND BY MODE OPERATIONS 5.10.1 TV START-UP OPERATIONS 5.10.1.1 Schematic Diagram For Start-Up Operations 5.10.1.2 TV Start-Up And Microcontroller Initialisation 5.10.2 TV NORMAL RUN AND STAND-BY MODE OPERATIONS 5.10.2.1 TV On Normal Run Mode 5.10.2.2 TV Set On Stand-By Mode SERVICE PARTS LIST 6.1 DTH-29U7ZL 6.2 DTG-2881ZL EXPLODED VIEW 7.1 DTH-29U7 7.2 DTH-29U8 7.3 DTH-2881 7.4 DTH-28W8 7.5 DTG-28W9 PRINTED CIRCULT BOARD 8.1 MAIN PCB 8.2 CRT PCB 8.3 PFC PCB SCHEMATIC DIAGRAM 61 62 63 64 65 65 65 65 67 67 70 72 72 80 88 88 89 90 91 92 93 93 94 95 96
6
7
8
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CP830F Service Manual
DOCUMENT HISTORY VERSION V1.00 V1.01 DATE 18/11/02 22/11/02 COMMENTS Creation of document (Author M Hearn) for project CP830 100Hz TV. Reformatting of the document, plus insertion of Document History section
1 MAIN FEATURES 1.1 SPECIFICATIONS 1.1.1 GENERAL TV standard Colour system Sound system Power consumption Sound Output Power Speaker Teletext system Aerial input Channel coverage Tuning system Visual screen size Channel indication Program Selection Aux. terminal Tuner AV PAL - SECAM B/G D/K, PAL I/I, SECAM L/L PAL, SECAM PAL, SECAM, PAL 60, NTSC M, NTSC 4.43 NICAM B/G, I, D/K, L, FM 2Carrier B/G, D/K 29"(4:3) Real Flat :84W approx. 28"(16:9) Real Flat : 84W approx. 7W x 2 (at 60% mod, 10%THD) 12W 8 ohm x2 9 pages memory FASTEXT (FLOF or TOP) 75 ohm unbalanced Off-air channels, S-cable channels and hyperband frequency synthesiser tuning system 28" : 66cm 29" : 68cm On Screen Display 100 programmes 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 front of cabinet. Headphone jack (3.5 mm) on front of cabinet SVHS3 (option) : Jack on front of cabinet ? sound input common with AV3. R-46G22
Remote Control Unit
1.1.2 EURO-SCART 1 (21 Pin) Pin Signal Description 1 Audio Output Right 2 Audio Input Right 3 Audio Output Left 4 Audio Earth 5 Blue Earth 6 Audio Input Left 7 Blue Input
Matching value 0.5 Vrms, Impedance < 1 k , ( RF 54% Mod ) 0.5 Vrms, Impedance > 10 k 0.5 Vrms, Impedance < 1 k , ( RF 54% Mod )
0.5 Vrms, Impedance > 10 k 0.7 Vpp 0.1V, Impedance 75
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CP830F Service Manual
9 10 11 12 13 14 15 16 17 18 19 20 21 Green Earth N.C. Green Input N.C. Red Earth Blanking Earth Red Input Fast Switching Video Out Earth Video In Earth Video Output Video Input Common Earth
0.7 Vpp
0.1V, Impedance 75
0.7 Vpp 0.1V, Impedance 75 0 to 0.4V : Logic 0 , 1 to 3V : Logic 1 , Impedance 75
1 Vpp 1 Vpp
3dB, Impedance 75 3dB, Impedance 75
1.1.3 EURO-SCART 2 (21 Pin) Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Signal Description Audio Output Right Audio Input Right Audio Output Left Audio Earth Earth Audio Input Left N.C. N.C. N.C. N.C. N.C. N.C. Earth Earth Chroma Input N.C. Earth Video In Earth Video Output Video Input, Y In. Common Earth Matching value 0.5 Vrms, Impedance < 1 k ( RF 54% Mod ) 0.5 Vrms, Impedance > 10 k 0.5 Vrms, Impedance < 1 k , ( RF 54% Mod )
0.5 Vrms, Impedance > 10 k
3dB for a luminance signal of 1 Vpp
1 Vpp 1 Vpp
3dB, Impedance 75 3dB, Impedance 75
( Monitor output )
20 18 16 14 12 10 8 21 19 17 15 13 11 9 7
6 5
4 3
2 1
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CP830F Service Manual
1.2 CHANNEL/FREQUENCY TABLE CHANNEL C01 C02 C03 C04 C05 C06 C07 C08 C09 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 EUROPE CCIR 46.25 48.25 55.25 62.25 175.25 182.25 189.25 196.25 203.25 210.25 217.25 224.25 53.75 82.25 183.75 192.25 201.25 471.25 479.25 487.25 495.25 503.25 511.25 519.25 527.25 535.25 543.25 551.25 559.25 567.25 575.25 583.25 591.25 599.25 607.25 615.25 623.25 631.25 639.25 647.25 655.25 663.25 FRANCE 55.75 (L ) 60.5 (L ) 63.75 (L ) 176.00 184.00 192.00 200.00 208.00 216.00 189.25 (LUX) 69.25 (L ) 76.25 (L ) 83.25 (L ) 90.25 97.25 471.25 479.25 487.25 495.25 503.25 511.25 519.25 527.25 535.25 543.25 551.25 559.25 567.25 575.25 583.25 591.25 599.25 607.25 615.25 623.25 631.25 639.25 647.25 655.25 663.25
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GB(IRELAND) 45.75 53.75 61.75 175.25 183.25 191.25 199.25 207.25 215.25 223.25 231.25 239.25 247.25 49.75 57.75 65.75 77.75 85.75 471.25 479.25 487.25 495.25 503.25503.25 511.25 519.25 527.25 535.25 543.25 551.25 559.25 567.25 575.25 583.25 591.25 599.25 607.25 615.25 623.25 631.25 639.25 647.25 655.25 663.25
EAST OIRT 49.75 59.25 77.25 85.25 93.25 175.25 183.25 191.25 199.25 207.25 215.25 223.25 471.25 479.25 487.25 495.25 511.25 519.25 527.25 535.25 543.25 551.25 559.25 567.25 575.25 583.25 591.25 599.25 607.25 615.25 623.25 631.25 639.25 647.25 655.25 663.25
CP830F Service Manual
CHANNEL C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 S01 S02 S03 S04 S05 S06 S07 S08 S09 S10 S11 S12 S13 S14 S15 S16 EUROPE CCIR 671.25 679.25 687.25 695.25 703.25 711.25 719.25 727.25 735.25 743.25 751.25 759.25 767.25 775.25 783.25 791.25 799.25 807.25 815.25 823.25 831.25 839.25 847.25 855.25 863.25 69.25 76.25 83.25 90.25 97.25 59.25 93.25 105.25 112.25 119.25 126.25 133.25 140.25 147.25 154.25 161.25 168.25 231.25 238.25 245.25 252.25 259.25 266.25 FRANCE 671.25 679.25 687.25 695.25 703.25 711.25 719.25 727.25 735.25 743.25 751.25 759.25 767.25 775.25 783.25 791.25 799.25 807.25 815.25 823.25 831.25 839.25 847.25 855.25 863.25 104.75 116.75 128.75 140.75 152.75 164.75 176.75 188.75 200.75 212.75 224.75 236.75 248.75 260.75 272.75 284.75
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GB(IRELAND) 671.25 679.25 687.25 695.25 703.25 711.25 719.25 727.25 735.25 743.25 751.25 759.25 767.25 775.25 783.25 791.25 799.25 807.25 815.25 823.25 831.25 839.25 847.25 855.25 863.25 103.25 111.25 119.25 127.25 135.25 143.25 151.25 159.25 167.25 255.25 263.25 271.25 279.25
EAST OIRT 671.25 679.25 687.25 695.25 703.25 711.25 719.25 727.25 735.25 743.25 751.25 759.25 767.25 775.25 783.25 791.25 799.25 807.25 815.25 823.25 831.25 839.25 847.25 855.25 863.25 105.25 112.25 119.25 126.25 133.25 140.25 147.25 154.25 161.25 168.25 231.25 238.25 245.25 252.25 259.25 266.25
CP830F Service Manual
CHANNEL S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41 EUROPE CCIR 273.25 280.25 287.25 294.25 303.25 311.25 319.25 327.25 335.25 343.25 351.25 359.25 367.25 375.25 383.25 391.25 399.25 407.25 415.25 423.25 431.25 439.25 447.25 455.25 463.25 FRANCE 296.75 136.00 160.00 303.25 311.25 319.25 327.25 335.25 343.25 351.25 359.25 367.25 375.25 383.25 391.25 399.25 407.25 415.25 423.25 431.25 439.25 447.25 455.25 463.25 GB(IRELAND) 287.25 295.25 303.25 311.25 319.25 327.25 335.25 343.25 351.25 359.25 367.25 375.25 383.25 391.25 399.25 407.25 415.25 423.25 431.25 439.25 447.25 455.25 463.25 EAST OIRT 273.25 280.25 287.25 294.25 303.25 311.25 319.25 327.25 335.25 343.25 351.25 359.25 367.25 375.25 383.25 391.25 399.25 407.25 415.25 423.25 431.25 439.25 447.25 455.25 463.25
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CP830F Service Manual
1.3 ATSS SORTING METHOD The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling software for each program checks if a VPS CNI code is transmitted (this system exists for German, Swiss and Austrian transmissions). If no VPS CNI code is found, then the system checks if a CNI code is transmitted as part of the teletext transmission ( Packet 8/30 format 1 and format 2). If such a code ( VPS or teletext ) is found and if this code is in the ATSS list, the program is automatically named. If the transmission does not have VPS CNI, and no teletext service is available, then there is no possibility of the program being automatically named. The programs found are then sorted in 4 groups : Group I : It contains all the programs from the selected country and named by the TV controlling software. Within this group the sorting order is fixed by the ATSS list. Group II : It contains all the programs with a strong signal strength which are not listed in group I. Group III : It contains all the programs with a weak signal strength which are not listed in group I. Group IV : If two or more programs with the same code are found, only the strongest ( or if they have the same level the one with the lowest frequency) is listed in group I, II or III. The others are listed in group IV.
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