Daewoo DTQ-14Q1FS, Service Manual

Page 1: ...CO LTD CHASSIS CN 201A B NTSC M SYSTEM MODEL DTQ 14Q1FS DTQ 14Q2TS DTQ 14Q3FS DTQ 14T1AS DTQ 14T2FS DTQ 20Q1FS DTQ 20Q2FS DTQ 20Q3FS DTQ 20T1AS DTQ 20T2AS DTQ 20T1FS DTQ 20T2FS DTQ 20T3FS DTQ 21T1FS...

Page 2: ...33 Schematic Diagram with Waveforms 50 Parts List 51 Option List 65 POWER INPUT AC90V AC250V 50 60Hz DTQ 20T1FC 120V 60HZ ONLY POWER RATING 14 Model 60W 20 MONO Model 70W 20 ST Model 80W 21 ST Model 8...

Page 3: ...ERS IS THE PICTURE TUBE HOWEVER THIS TUBE DOES NOT EMIT X RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC OPERATION AT HIGHER VOLTAGE...

Page 4: ...etc and the exposed metallic parts one at a time Measure the A C voltage across the combination of 1500 ohm resistor and 0 15 MFD capacitor Reverse the A C plug and repeat A C voltage measurements for...

Page 5: ...e to heat duct or in the path of heated air flow 2 Avoid conditions of high humidity such as Outdoor patio installations where dew is a factor Near steam radiators where steam leakage is a factor etc...

Page 6: ...A V component 4 EARPHONE IN jack Use this jack to receive a audio signal from your TV 5 STAND BY red indicator This indicator lights up when the power is off 6 Remote control receiver This receiver re...

Page 7: ...or erase the channel from memory 7 MUTE Use to turn the TV s sound on and off 8 0 9 Use these buttons to change channels 9 SLEEP Use this button to program the TV to turn off after a certain time 10 P...

Page 8: ...A V component 4 EARPHONE IN jack Use this jack to receive a audio signal from your TV 5 STAND BY red indicator This indicator lights up when the power is off 6 Remote control receiver This receiver re...

Page 9: ...or erase the channel from memory 7 MUTE Use to turn the TV s sound on and off 8 0 9 Use these buttons to change channels 9 SLEEP Use this button to program the TV to turn off after a certain time 10 P...

Page 10: ...t always be certain that all the protective devices are put back in place such as nonmetallic control knobs insulating covers shields isolation resistor capacitor network etc 4 Before returning the se...

Page 11: ...9...

Page 12: ...enter may meet with the mechanical CENTER of CRT 3 Press the RECAL key to store 4 Initial value of D P 35 6 VERTICAL HIGHT ADJUSTMENT 1 Receive the Retma Pattern 2 Press the S6 59H key of Service Remo...

Page 13: ...e the yoke backward to provide vertical green belt zone in the picture screen 5 Remove the Rubber Wedges 6 Rotate and spread the tabs of the purity magnet See figure 2 around the neck of the picture t...

Page 14: ...n figure 2 temporarily Do not remove cover paper on adhesive part of the wedge 3 Tilt front of the deflection yoke up or down to obtain better convergence in circumference See Fig 4 Push the mounting...

Page 15: ...D then adjust the maximum voltage of Scope to attenuate 1V Initial value of the maximum voltage About 7V For example if initial maximum voltage is 7V adjust it to 6V 4 Press the RECALL key to store In...

Page 16: ...INPUT 8 DRIVE DRIVE BASE DRIVE CURRENT Id OUTPUT 9 Vin Vin SUPPLY VOLTAGE FOR CONTROL CIRCUIT 14 This chassis designed for free voltage AC 100V AC 220V power power block contains power IC SMPS transf...

Page 17: ...7 A oscillator generates pulse signals which turns a power transistor on and off by making use of charge and discharge of C1 and C2 incorporated in the Hybrid IC Constant voltage control of a switch m...

Page 18: ...hreshold voltage of COMP 1 VTH1 is set at 0 75V Ta 25 and an input signal to a drive circuit becomes almost OV the power transistor is in OFF mode when a voltage at the INH terminal reaches the VTH1 A...

Page 19: ...ge at the INH terminal VINH shall be set at Fig 9 shows waveforms of VCE Ic and VINH of the transistor voltage across C807 in the oscillator as well as an output from the oscillator when operating in...

Page 20: ...h as because the transistor is driven by the drive current shown in FIg 10 1 In addition since is decreases linearly when the transistor turn off and a peak value of lB2 is not large the storage time...

Page 21: ...mum when VIN terminal voltage is 4V the power supply circuit sustains the off state as long as current of 500 maximum flows to VIN terminal from a start up resistor In order to prevent a malfunction t...

Page 22: ...he IC exceeds 150 typical Although the temperature is actually sensed at the control chip lt works against overheating of the power transistor as the power transistor and the control IC are mounted on...

Page 23: ...drop at R423 of 123 V line In case that the overload occurs at the rear of 123 V line the increase of the voltage drop at R423 bring down the base voltage of the Q407 os as to drive the Q407 Because...

Page 24: ...1 SMPS TRANS CHECK FEED BACK INPUT I801 VIN 9 SENS 7 COLEECTOR 1 I1702 VDD 8 CLK 6 DATA 5 CHECK DC 5V CHECK CLOCK PULSE ST BY OV POER ON I501 H VCC 21 BUS 43 INTERFACE 44 H OUT 23 CHECK H OUT PUSLE ST...

Page 25: ...32 ABL 33 ACL 30 R OUTPUT 29 G OUTPUT 28 B OUTPUT 4 CHECK 7 4V LINE CHECK R G B SIGNAL 4 6V 1 6V 3Vp p T 402 HEATER 180 V ABL D405 D402 CHECK 180V LINE CHECK HEATER VTG 6 3Vms RC549 CC511 0 1MF B SF...

Page 26: ...TPUT 47 INTERNAL VIDEO INPUT 49 SOUND IF INPUT 51 AUDIO OUTPUT CHECK DC 9V CHECK RESONATOR Z601 I601 23 30 CES 1 OUT L 42 OUT R 24 COMP IN CHECK INPUT COMP SIGNAL CHECK SOUND IF SIGNAL Z2 Z1 RC1 L1 I5...

Page 27: ...OIL CHECK CLK EN DATA SIGNAL I702 5 DATA 6 CLK I701 5 T CLK 6 T DATA 7 M EN CHECK VIDEO SIGNAL FILTER CHECK R G B SIGNAL BRIGHT CONTRAST 4 6V 1 6V 3Vp p I501 40 COLOR 42 SELECT VIDEO OUTPUT 32 ABL 33...

Page 28: ...26 NO VERTICAL DEFLECTION I301 INV 5 OUTPUT 2 VCC 6 V D Y CHECK OUTPUT CHECK DC 25V CHECK V OUT SUGBAK CHECK SYNK SIGNAL 17 V OUT 37 SYNC...

Page 29: ...lL701 REMOCON SENSOR ON SCREEN DISPLAY DOES NOT OPERATE IC701 CHECK FOR 60Hz OSC CHECK R G B BL CHANGE R G B BL IF OSD DOES NOT OPERATE CHANGE IC701 CHECK FOR 15 734Hz VS HS GND 5V OUT CHECK WAVE FOR...

Page 30: ...28 DESCRIPTION OF SEMICONDUCTORS LA76070 BUS CONTROL VIF SIF Y C DEF I501 LA76070A BUS CONTROL VIF SIF Y C DEF...

Page 31: ...29 PIN ASSIGN OF IC LC864728V I701 NOTE XT is used 32 768 KHZ X TAL OUTPUT...

Page 32: ...ION SGND1 1 signal ground 1 Vi 1 2 vollage input 1 Vp 3 positive supply voltage Vi p 4 voltage input 2 SGND2 5 signal ground 2 n c 6 not connected n c 7 not connected OUT2 8 positive output 2 PGND2 9...

Page 33: ...or mute for SAP CDEC 19 14 capacitor DC decoupling for SAP GND 20 ground AGND 15 analog ground DGND 16 digital ground SDA 21 17 serial data input output l2C bus SCL 22 18 serial clock input l2C bus VC...

Page 34: ...1A 4856013301 SCREW CRT FIXING AS 30X140 YL M201B 4856214902 WASHER RUBBER CR T2 0 M201C 4856013303 SCREW CRT FIXING AS 30X250 YL M211A 7122401412 SCREW TAPPING T2S TRS 4X14 MFZN BK M211B 7122401412 S...

Page 35: ...0PF K TAPPING C416 CEXF1E101V C ELECTRO 25V RSS 100MF 6 3X11 TP C417 CEXF2C101V C ELECTRO 160V RSS 100MF 16X25 TP C420 CCXB2H271K C CERA 500V B 270PF K TAPPING C421 CEXF1H479V C ELECTRO 50V RSS 4 7MF...

Page 36: ...O 50V RSS 10MF 5X11 TP C625 CEXF1H479V C ELECTRO 50V RSS 4 7MF 5X11 TP C626 CEXF1H479V C ELECTRO 50V RSS 4 7MF 5X11 TP C627 CEXF1H229V C ELECTRO 50V RSS 2 2MF 5X11 TP C628 CMXB1H153J C MYLAR 50V EU 0...

Page 37: ...RA 50V X7R 0 01MF K 2012 CC509 HCBK102KCA C CHIP CERA 50V X7R 1000PF K 2012 CC511 HCBK104KCA C CHIP CERA 50V X7R 0 1MF K 2012 CC512 HCQK160JCA C CHIP CERA 50V CH 16PF J 2012 CC516 HCBK103KCA C CHIP CE...

Page 38: ...33GT DIODE BYD33G T D406 D1N4148 DIODE 1N4148 TAPPING D407 DUZ7R5BM DIODE ZENER UZ 7 5BM 7 5V D408 D1N4148 DIODE 1N4148 TAPPING D409 DUZ9R1BM DIODE ZENER UZ 9 1BM 9 1V D412 DBY228 DIODE BY228 TAPPING...

Page 39: ...01065GY WIRE COPPER AWG22 1 0 65 TIN COATING J011 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J012 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J013 85801065GY WIRE COPPER AWG22 1 0 65 TIN COAT...

Page 40: ...02 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J303 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J305 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J306 85801065GY WIRE COPPER AWG22 1 0 65 TI...

Page 41: ...TIN COATING J901 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J902 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING JA01 4859108450 JACK PIN BOARD YSC03P 4120 14A JA02 4859102130 JACK EARPHONE YSC 1...

Page 42: ...5923162S CONN WAFER YW025 03 STICK P602 485923162S CONN WAFER YW025 03 STICK P802A 4859901111 CORD POWER KKP 419C KLCE 2F 2 1ME P802B 4859203030 CONN TERMINAL YPT 018 P803 4857417500 TERM PIN DA IB021...

Page 43: ...HM J TAPPING R417 RD 4Z131J R CARBON FILM 1 4 130 OHM J R419 RD 4Z131J R CARBON FILM 1 4 130 OHM J R420 RS01Z100J R M OXIDE FILM 1W 10 OHM J TAPPING R423 RF01Z688J R FUSIBLE 1W 0 68 OHM J TAPPING R424...

Page 44: ...A R CHIP 1 10 33K OHM J 2012 RC311 HRFT101JCA R CHIP 1 10 100 OHM J 2012 RC312 HRFT133JCA R CHIP 1 10 13K OHM J 2012 RC401 HRFT331JCA R CHIP 1 10 330 OHM J 2012 RC402 HRFT102JCA R CHIP 1 10 1K OHM J 2...

Page 45: ...10 2K OHM J 2012 RC550 HRFT272JCA R CHIP 1 10 2 7K OHM J 2012 RC551 HRFT153JCA R CHIP 1 10 15K OHM J 2012 RC552 HRFT103JCA R CHIP 1 10 10K OHM J 2012 RC603 HRFT222JCA R CHIP 1 10 2 2K OHM J 2012 RC60...

Page 46: ...1 10 10K OHM J 2012 RC727 HRFT103JCA R CHIP 1 10 10K OHM J 2012 RC728 HRFT102JCA R CHIP 1 10 1K OHM J 2012 RC729 HRFT121JCA R CHIP 1 10 120 OHM J 2012 RC730 HRFT102JCA R CHIP 1 10 1K OHM J 2012 RC731...

Page 47: ...FT000 CA R CHIP 1 10 0 OHM 2012 RC933 HRFT000 CA R CHIP 1 10 0 OHM 2012 RLY1 5SC0101325 SW RELAY HR CR7 DC12V RS801 DSVC471D14 VARISTOR SVC471D14A SCT1 4859303030 SOCKET CRT ISMM03S SF501 5PM1859M FIL...

Page 48: ...Item Code Item Name Description PCW1 4859903610 POWER CORD AS DJ 10W BSP3 1 2H 2100 F801 5F1GB4021L FUSE GLASS TUBE 4L CSA TL 4A 125V MF51 RS801 DSVC271D14 VARISTOR SVC271D14A DTQ 20T1FC DIFFERENT PAR...

Page 49: ...76 76 5UH L402 TRW 414M R407 1W 2 7K OHM 1W 2 7K OHM 1W 2 7K OHM R423 1W 0 82 OHM 1W 0 68 OHM 1W 0 68 OHM 1W 0 68 OHM R426 1 4 24K OHM 1 4 15K OHM 1 4 15K OHM 1 4 15K OHM RC302 1 10 110K OHM 1 10 110K...

Page 50: ...7MF C626 50V RSS 4 7MF 50V RSS 4 7MF C627 50V RSS 2 2MF 50V RSS 2 2MF C628 50V EU 0 015MF 50V EU 0 015MF C629 50V EU 0 015MF 50V EU 0 015MF C630 50V RSS 2 2MF 50V RSS 2 2MF C631 50V EU 0 012MF 50V EU...

Page 51: ...604 1 10 20K OHM 1 10 20K OHM RC605 1 10 8 2K OHM F 1 10 8 2K OHM F RC606 1 10 160 OHM F 1 10 160 OHM F RC607 1 10 1K OHM 1 10 1K OHM RC608 1 10 1K OHM 1 10 1K OHM RC610 1 10 1K OHM 1 10 1K OHM RC611...

Page 52: ......

Page 53: ......

Page 54: ......

Page 55: ......

Page 56: ......

Page 57: ......

Page 58: ......

Page 59: ......

Page 60: ......

Page 61: ......

Page 62: ......

Page 63: ......

Page 64: ......

Page 65: ......

Page 66: ......

Page 67: ......

Page 68: ......

Page 69: ...ENGINEER NOTE...

Page 70: ...DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 F A X 02 364 5588 5305 T E L 02 360 7360 4 7315 7 PRINTED DATE APR 1998 S M NO CN201N 010...

Page 71: ......

Page 72: ......

Page 73: ......

Page 74: ......