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REAL FLAT 100Hz WIDE TV DSC-3270E DAEWOO DIGITAL 2002. 4 DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 1 DSC-3270E *SPECIFICATION 1.Outstanding Picture Quality - 32" pure Flat Picture Tube - 4H COMB Filter - Color Transient Improvement Digital Utopia - DAEWOO DIGITAL 3.Various picture control - Available for 3 kinds of input - OSD : various language support - Still picture - 100 HZ Scanning - Velocity Modulation Scanning - Dynamic Double Focus System - 4:3 , 16:9 , panorama , Zoom , Zoom+ - Tilt control Circuit 2. High Quality Sound - Dolby Pro-Logic - 8W + 8W + 5W Speaker 4. Reliability - Safety Standard : CE , CB - TSD , OCP DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 2 DSC-3270E SYNOPSIS * POWER BLOCK - Stand-by power Part - Main power Part - Audio power part *Video Block -Tuner part -AV switching part -video processing part -video amplify part Digital Utopia - DAEWOO DIGITAL * DEFLECTION BLOCK -Horizontal part -Vertical part -Dynamic double Focus part * Audio Block - Audio signal processing part - Amplify part INPUT VOLTAGE : AC 230V, 50Hz POWER CONSUMPTION : 180W (VOLUME MAX, STANDARD PICTURE) DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 3 DSC-3270E Block Diagram Digital Utopia - DAEWOO DIGITAL DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 4 DSC-3270E COMPOSITION OF POWER SUPPLY Digital Utopia - DAEWOO DIGITAL POWER SUPPLY is composed of Fly-back form to supply various power. Pin No T801 8 18 17 15 T802 14 13 11 T804 8 General Purpose General Purpose General Purpose Audio Amp B+ 12 ± 0.5 V 9 ± 0.5 V 5 ± 0.5 V 26 ± 2 V 500mA 400mA 500mA 1200mA USAGE STAND-BY 5V FBT B+ 140V line SVM AMP Transistor B+ H-DRIVE Trans B+ VOLTAGE 5 ± 0.5 V 140± 2 V 130 ± 0.5 V 24 ± 0.5 V CURRENT 100mA 850mA 200mA 500mA DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 5 DSC-3270E Stand By CIRCUIT THE AC INPUT POWER IS RECTIFIED AND FLATED BY THE NOISE FILTER, BRIDGE DIODE AND CONDENSER (C806) Digital Utopia - DAEWOO DIGITAL THE RECTIFIED AND FLATED VOLTAGE IS SUPPIED TO TRANS AND SMPS IC (I801) SECONDARY CIRCUIT OF THE TRANS (T801) SUPPLIES THE STAND-BY POWER FOR MICROPROCESSOR S/B 5V NOISE FILTER DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 6 DSC-3270E Degaussing CIRCUIT Digital Utopia - DAEWOO DIGITAL D/G SW PIN3 AT MICOM SUPPIES D/G SW SIGNAL (L->H) TO BASE OF Q802 Q802 ON -> CURRENT FLOWS THROUGH RELAY COIL -> SW ON AC INPUT CURRENT FLOWS AT D/G COIL THROUGH RV801 R838'S RESISTANCE INCREASES BY THE CURRENT THEN THE RELAY IS OFF DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 7 DSC-3270E MAIN POWER CIRCUIT D/G Relay Digital Utopia - DAEWOO DIGITAL 28V D/G SW PWR Relay PWR SW PIN53 AT MICOM SUPPIES POWER SIGNAL (L->H) TO BASE OF Q803 AFTER Q803 ON, CURRENT FLOWS THROUGH RELAY COIL. THEN, THE SWITCH ON WHEN VOLTAGE AT THE PIN 9 OF STR-S6709 IS APPROXIMATELY 8V I803 (STR-S6709) IS STARTED. DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 8 DSC-3270E OPERATION OF STR-S6709 Digital Utopia - DAEWOO DIGITAL CHARGED VOLTAGE AT C818 THROUGH START RESISTOR IS APPROXIMATELY 8V THEN, STR-S6709 START AFTER START, THE STABLE VOLTAGE IS SUPPLIED TO #9 THROUGH THE D WINDING OF T802 D804 T802 DURING d1 VOLTAGE IS RISING TO 8V. RECTIFIED d2 VOLTAGE IS USED Vin STARTING POINT RECTIFIED d2 VOLTAGE R807 START RESISTOR Q801 DARLINGTON TR D806 I803 STR-S6709 d1 VOLTAGE C818 D805 7.5V ZENER DIODE DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 9 DSC-3270E PROTECTIVE FUNCTION OF STR-S6709 Digital Utopia - DAEWOO DIGITAL OCP (Over Current Protection) OCP IS OPERATED DIRECTLY BY DETECTION OF THE COLLECTOR CURRENT THROUGH Rocp (R808) TSD (Thermal ShutDown) TSD IS OPERATED IN THE CASE THAT FRAME TEMPERATURE OF THE IC IS OVER 150 OVP (Over Voltage Protection) OVP IS OPERATED WHEN THE TERMINAL VOLTAGE OF #9 IS OVER 11V & BY FEED-BACK WHEN THE SECONDARY OUTPUT IS OVERVOLTAGE LATCH FUNCTION WHEN OVP/TSD IS OPERATED, LET THE OPERATION OF POWER CITCUIT SHUT DOWN BY MAKING THE OUTPUT OF OSCILLATOR TO LOW STATE DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 10 DSC-3270E PROTECTION CIRCUIT Digital Utopia - DAEWOO DIGITAL PROTECT to u-COM PIN43 IN NORMAL STATE, Q804 IS OFF IN ABNORMAL STATE, R838 DETECTS THE FAULTS. THEN Q804 ON PROTECT SIGNAL IS TRNASFERED TO MI-COM FBT PROTECT MI-COM MAKE THE TV-SET TO STAND-BY STATE 142V 142V DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 11 DSC-3270E NO power Troubleshooting Stand-by LED doesn't light up no C806's VDC is approximately 280v Digital Utopia - DAEWOO DIGITAL Check F801 & D801 The following waveform is to drain of I801 320 Vp-p no Check the impedance value of between Source and Drain to I801 . If the value is near 0 ohm , I801 is dead 100KHz Check if voltage to PW803 #7 is supplied to I701 Check the parts caused a shortcircuit to secondary circuit DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 12 DSC-3270E NO power Troubleshooting no Relay (Y802) operation is OK yes Digital Utopia - DAEWOO DIGITAL If the base of Q803 is on 5V? yes Change Q803 or Y802 no Check stand-by power no Check D802,R803 and D825 Is R803 is on 280Vdc ? yes no Check the I803 #1. 380 Vp-p Check the primary circuits of SMPS IC , and replace defective parts 50~80KHz yes Check the parts caused a shortcircuit to secondary circuit DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION 13 DSC-3270E 1) H-drive part Horizontal deflection * Making H-drive pulse Digital Utopia - DAEWOO DIGITAL 12 Vp-p 31.25KHz 2)H-DY Scanning part * Generating H-DY scanning pulse 1.2 KVp-p 31.25KHz 3)High voltage part 6.5 uS * Generating High voltage 29.5KV 4)E-W compesation part * Overlapping E-W signal to H-DY pulse 25 Vp-p 100Hz 5)innerpincushion part Q453(FET) * Switching s-correction condenser C410 C453 DAEWOO ELECTRONICS CO., LTD DIGITAL TV DEVISION