Daewoo DTH-14Q1FS Service Manual
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Daewoo DTH-14Q1FS Service Manual

Daewoo DTH-14Q1FS Service Manual

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  • Page 2: Table Of Contents

    § CONTENTS SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - SAFETY INSTRUCTIONS °...

  • Page 3: Specifications

    § SPECIFICATIONS CHASSIS CM-537 Receiving System NTSC/PAL-M/PAL-N Main Voltage AC 100/220V, 50/60Hz Power Consumption 60 Watts (14”) / 65 Watts (20”) Sound Output 2.5W (16§ ) Antenna Impedance 75§ Unbalanced Tuning System Frequency Synthesizer Number of Memory 181 Channels Channel Reception Channel VHF TV LOW:CH2~6...

  • Page 4: Safety Instructions

    § SAFETY INSTRUCTIONS § SAFETY PRECAUTION WARNING: Service should not be attempted by anyone unfamiliar Plug the AC line cord directly into a AC outlet. Use an AC with the necessary precaution on this receiver. voltmeter having 500 ohms per volt or more sensitivily in the The following are the necessary precaution to be observed before following manner.

  • Page 5: Location Of Controls

    § LOCATION OF CONTROLS MAIN POWER VIDEO AUDIO STAND-BY MENU § REMOTE CONTROL UNIT 1. POWER Used to turn TV ON or OFF. Â 2. ¡ ¡ ª ª CH¡ ¡ Use these buttons to change channels on your POWER TV, or select items in the menu system.

  • Page 8: General Alignment Instructions

    § GENERAL ALIGNMENT INSTRUCTIONS THIS RECEIVER IS TRANSISTORIZED. SPECIAL CARE MUST BE TAKEN WHEN SERVICING. READ THE FOLLOWING NOTES BEFORE ATTEMPTING ALIGNMENT. • Alignment requires an exact procedure and should be undertaken only when necessary. • The test equipment specified or its equivalent is required to perform the alignment properly.The use of a equipment which does not meet these requirements may result in improper alignment.

  • Page 9: Screen Adjustment

    § PIF VCO ADJUSTMENT [Measuring Instrument Connection] RF PATTERN DIGITAL MULTI DC POWER GENERATOR METER SUPPLY PM-5518 (L102) (I501 #7) (R701) (I201) [ADJUSTMENT SET] (FIGURE 1) 1. Connect the 12V DC POWER SUPPLY to TP4 and TP5. 2. Set the frequency of RF PATTERN GENERATOR with COLOR BAR PATTERN signal to 45.75MHz, and connect the RF output to TP1.
  • Page 10 3. Adjust the SCREEN VOLUME of FBT in order that the one line of screen disappear. 4. Push the 9D.SCR key of SERVICE REMOCON again. § FOCUS ADJUSTMENT 1. Receive the RETMA pattern. 2. Adjust the FOCUS volume of FBT to obtain the most clear picture. §...
  • Page 11 § VERTICAL HIGHT ADJUSTMENT 1. Receive the RETMA PATTERN. 2. Set the user control to AUTO PICTURE ON. 3. Adjust the R301 so that the CENTER of circumference of big circle may meet with the upper and lower sides of screen. §...
  • Page 12 § DESCRIPTION OF CIRCUIT OPERATION § FEATURE OF THE CM-537 •VIDEO, CHROMA, DEFLECTION in one-chip IC. •Automatic switching of 3-SYSTEM(NTSC, PAL-M, PAL-N). •FS(Frequency Synthesizer ) Tunning System. •Function of LAST MEMORY against the electric failure (E PROM:24LC028). •Separation of PIF and SIF(SAW filter :DSW1013P) •Minimization of Ringing by applying Ringing-less FBT(2001SPND) •Auto-compensation of the vertical height level against the frequency change of AC power .
  • Page 13 NAME/(ABBREV) FUNCTION REMARK KEY SCAN OUT 1 · KEY MATRIX COLUMN 1 & CLOCK · TUNER CLOCK & EEPROM CLOCK (R23) KEY SCAN OUT 2 · KEY MATRIX COLUMN 2 & DATA · TUNER DATA & EEPROM DATA (R22) ENABLE ·...
  • Page 14 NAME/(ABBREV) FUNCTION REMARK POWER · Active HIGH · LOW state at initial condition (RESET). except · Toggle LOW/HIGH when POWER KEY input is detected. HEAT-RUN mode (LOW ¡ POWER OFF / HIGH ¡ POWER ON) · Automatically turns to LOW when SLEEP TIMER (count down) counts “0”.

  • Page 15: Block Diagram

    B. VIDEO BLOCK 1. TV/VIDEO SWITCHING 1) SWITCHING BLOCK DIAGRAM I501 µ-COM LA7688 (I701) VIDEO Q503 TV(H) /VI(L) VIDEO SWITCH Filter EXT.VIDEO (JV01/JV02) R,G,B OUT 2) CIRCUIT OPERATION •After going out to the #8 of I501, the detected signals go into the #10 of I501through 4.5MHz BPF(Band Pass Filter, Z502) : TV SIGNAL.
  • Page 16 ¢¡PAL-N system •If 60[Hz] detected, #21 of the I501 goes up to HIGH level and the system operates as PAL-M or NTSC-M. ¤ In the case that Base voltage of Q705 is LOW, the voltage driven from R766 and R774 is applied to the #28 of the I701.
  • Page 17 3.SOUND AMP IC 1) BLOCK DIAGRAM TDA7056A Earphone Jack S.GND Volume OUT(+) P.GND OUT(–) N.C SPEAKER From 16 ohm of I501 SP01 From of I701 2) EXPLAINATION OF THE OPERATION •The audio signal from the I501 goes into the #3 of the I601. •I601 amplifies this audio signal correspond to the volume control signal from I701.
  • Page 18 D. DEFLECTION BLOCK This block can be separated into two parts, VERTICAL and HORIZONTAL. Only the VERTICAL circuit is explained here, comprehensibly. 1. BLOCK DIAGRAM OF VERTICAL IC LA7837 THERMAL PROTECTION Ramp Generator Vert. Drive Vert. Out Vert. Vert. Trig. Shot Size Pump UP...
  • Page 19 2. OPERATION OF VERTICAL (b) Q3 Collector Current i1 VCC1 (c) Q4 Collector Current i2 (d) Current of Deflection coil i1 + i2 (e)Emitter Voltage 1/2 VCC VERTICAL OUTPUT WAVE 1) In the picture above, (a) shows a fixed Vcc, and (+)(-)current of deflection coil is (d) whichk is sum of (b) and (c), and (e) shows EMITTER voltage of Q3,Q4.
  • Page 20 E. POWER BLOCK This chassis designed for free voltage(AC 100V ~ AC 220V ) power. power block contains power IC, SMPS transformer and several passive components. The power IC STR-S5707 has power transistor. oscillator circuit, voltage comparator circuit, thermal protection circuit, OCP(over current protection) circuit insiude.
  • Page 21 4. EXPLAINATION OF CIRCUIT OPERATION 1) V terminal, start-up circuit A start-up circuit is to start and stop a operation of a control IC by detecting a voltage appearing at a V terminal (pin-9). At start up of a power supply, when a voltage at the V terminal reaches to 8V by charging up C806 by the function of a start-up resistor, Rs, a control circuit starts operating by the function of the start-up circuit.
  • Page 22 2.3V 2.3V C2 ACROSS C2 ACROSS Voltage Voltage Drive Cfrcu1 PIN +2Di 0.75V 0.75V COMP 1 – C1 ACROSS C1 ACROSS VTH1 Voltage Voltage COMP 2 – VTH2 Osc. Osc. Output Output Fig 3 Oscillator Circuit Configulation Fig 4 Operation Waveforms of Oscillator without F/B nor Fig 5 Operation Waveforms of Oscillator with F/B Signal INH Signal As the circuit in Fig.
  • Page 23 4) Quasi-resonant operation By inputting a voltage signal which is synchronized with the energy discharge time of a secondary winding of a transformer to the. INH terminal, quasi-resonant operation can be achieved. As shown in Fig. 8 , the voltage of L1 winding which is synchronized.
  • Page 24 5) Drive circuit The STR-S5707 applies the proportional drive system in order to minimize turn-on and satruration loss, and storage time. In the conventional RCC system, turn-on loss and switching noise due to the surge current appearing when the power transistor turns on are high as because the transistor is driven by the drive current shown in Fig.
  • Page 25 6) OCP (overcurrent protection) function Overcurrent protection is performed pulse by pulse by directly detecting collector current of the power transistor. Configuration of the OCP circuit is shown in . Detecting voltage is set to -1V below a reference point of GND (ground).
  • Page 26 when the latch cirguit is on. V terminal voltage increases and decreases with- in the range from 4.9V typical to 8V typical and is prevented from abnormally rising. Fig. 12 shows an example of V terminal voltage waveform.Cancellation of the latch-is done by decreasing V terminal voltage below 3.3V.
  • Page 27 5.OCP (OVER CURRENT PROTECTION) CIRCUIT This circuit is designed to protect the circuit from over current due to overload occurred at the rear of 132[V] line. 1) CONFIGURATION OF OCP CIRCUIT R826 Q806 D810 KSA1013Y UZ-5.1 1/4W I701 #29 R820 (OCP) R824 R823...
  • Page 28 F.IC BLOCK DIAGRAM 1.LA7688: VIF/SIF/VIDEO/CHROMA/DEFLECTION 1-CHIP IC SIF IN FM-DET OUT RF AGC VR AUDIO OUT APC1 FILTER RF AGC OUT AUDIO FILTER IF GND VIF INPUT VIF INPUT AFT OUT IF AGC COMP. VIDEO OUT VIF VCC FILTER-REF/ SIF VCC S-VHS SW INT VIDEO IN APC FILTER...
  • Page 29 2.µ-COM : DMC42C200N RCO/PWM14 RC1/PWM60 TINT NTSC-M RC2/PWM61 COLOR PAL-M RO3/INT3 RC3/PWM62 SHARP AC DOWN DETECT RO2/INT2 PWM80 CONTRAST RO1/INTO/TIMI PWM81 BRIGHT REMOCON IN KEY IN 0 ROO/INTO/TIMO PWM82 VOLUME /S.MUTE (OPEN DRAIN) TV/VIDEO XOUT (OPEN DRAIN) /RESET POWER KEY IN 1 /V.MUTE (OPEN DRAIN) SCREEN OUT...
  • Page 30 3.LC89950 : CCD DELAY LINE (S&H.AMP) CLAMP 254.5 BIT AUTO BIAS Ø1 Ø2 Pump-up AUTO BIAS (S&H.AMP) CLAMP 254.5 BIT Ø1 Ø2 4MHz 4MHz OSC. CLOCK DRIVER COMP TIMING DUTY Compensation Wave Forming 1/256 COUNTER Phase comporator VCO IN PC OUT...
  • Page 31 3.LOCAL KEY & OPTION SW KEY IN 0 ROO/INTO/TIMO KEY IN 1 KEY IN 2 I701 KEY -O 0 CH – VOL – MENU KEY -O 1 CH + VOL + KEY -O 2 AUTO-ON TV/VID LANGUAGE...
  • Page 32 4.STR-S5707 : POWER IC V IN START UP LATCH DIRVE PROPOTIONAL DRIVE SINK SENS PRE REG PNP +2Di T.S.D INH-1 INH-2 R8 R9 INH-3 Internal Circuit Constants TON Adjustment Trimming Resistor 2.5KΩ 820pF TOFF Adjustment Trimming Resistor 35KΩ 0.01¥ F 1.0KΩ...
  • Page 33 5.LA7837 : VERTICAL IC Vert Power supply (+B1) Ting Input Vertical trigger input Time constant Shot Multi Vertcal height control 50/60Hz vertical size control signal input Ramp wavefom generation AC/DC feedback input to vertcal output section Vert. Power supply (+B8) Drive Pump Pump-up output...

  • Page 34: Trouble Shooting Charts

    § TROUBLE SHOOTING CHARTS ¡ÆNO SOUND CHECK THE SPEAKER CHECK THE VOLTAGE OF REPLACE SPEAKER PIN 2 OF I601 CHECK THE PIN 6 AND 8 CHECK/REPLACE OF I601 AT THAT R606, I601 SOUND VOLUME MAX. CHECK PIN 5 OF I601 CHECK THE PIN 51 OF I501 CHECK/REPLACE I701 CHECK AFT AND CHECK THE...
  • Page 35 § OUT OF VERTICAL SIZE CHECK THE VOLTAGE OF PIN 21 OF I501 N.B. : NTSC / PAL-M:H/PAL-N:L CHECK Q502 CHECK THE NTSC/PAL SW CHECK/REPLACE I301 REPLACE Q502 REPLACE I501 § NO VERTICAL SCAN (ONE HORIZ. LINE RASTER) CHECK WAVEFORM OF PIN20 OF I501 MEASURE THE VOLTAGE CHECK/REPLACE I501 OF PIN 8, 13 OF I301...
  • Page 36 § NO COLOR (GENERAL) RECEIVE A COLOR BAR SIGNAL WITH PATTERN GENERATOR CHECK THE CONTROL VOLTAGE OF I701 #39 (PUSH THE REMOCON CONTROL BUTTON FOR COLOR MAX) CHECK THE COLOR/KILLER CHECK/REPLACE I701 VOLTAGE OF I501 #17 CHECK THE COMPOSIT VIDEO SIGNAL ON #10 OF I501 CHECK/REPLACE I501 CHECK/REPLACE R527, L502, Z502,...
  • Page 37 § ON COLOR (AT PAL-M ONLY) CHECK THE VOLTAGE OF PIN 21 OF I501 (HIGH) CHECK PIN 27 OF I701 CHECK PIN 22 AND 23 (HIGH) OF I501 CHECK THE PIN 2 OF CHECK/REPLACE CHECK/REPLACE I701 (HIGH) C517, C518, R532 I501 AND X401 CHECK THE PIN 18 OF...
  • Page 38 § NO RASTER (NOISE OR WEAK SOUND) CHECK +9V/+7.6V LINE ON MAIN PCB LOW OR ZERO CHECK/REPLACE R202, I201 CHECK/REPLACE I501 CHECK/REPLACE D201, R201 CHECK/REPLACE U101 § NO PICTURE (RASTER REMAINS AND NO SOUND) OPEN THE SLIT OF TUNER IF OUTPUT AND CONNECT TESTER LEADS TO PIF INPUT STAGE (C101) AND EARTH MOMENTARILY NOISE IS APPEARED OR NOT?
  • Page 39 § NO PICTURE (RASTER AND SOUND OK) CHECK WHETHER THE BRIGHT & CONTRAST ARE CONTROLLABLE OR NOT? CHECK/REPLACE THE COMPOSITE CHECK THE VOLTAGE OF SIGNAL INPUT STAGE +185V ON CRT BOARD AND VIDEO PARTS OF I501 CHECK THE VCC VOLTAGE AT CHECK/REPLACE THE CHECK/REPLACE +185V #40 OF I501...
  • Page 40 § AV DOES NOT OPERATE (TV SIGNAL IS OK) CHECK THE PIN 14 OF I501 CHECK THE AV SIGNAL OF CHECK THE DC VOLTAGE AT AV JACK JV01 AND JV02 #1 OF I501 CHECK #33 CHECK/REPLACE CHECK/REPLACE AV CHECK/REPLACE JACK JV01 AND JV02 OF I701 C540, CA01, RV02,RA01 I501...
  • Page 41 § POWER FAILS TO TURN ON (NO RASTER, NO SOUND DOES NOT TURN ON) CHECK FUSE F801 ON MAIN PCB REPLACE THE FUSE NEW FUSE ALSO OPENS CHECK +123V LINE ON MAIN PCB CHECK AND REPLACE D802, I801 NG(OV) (140V OR MORE) CHECK 5.1V LINE OF CHECK/REPLACE CHECK THE VOLTAGE...

  • Page 42: Replacement Parts List

    § Replacement Parts List ITEM PARTS CODE DESCRIPTION NUMBER REMARK A000 CORD POWER 4859901111 KKP-419CKLCE-2F(2.1ME) A001 PCB MAIN 4859802096 330X246(330X246) C101 C CERA CCZF1E103Z 25V F 0.01MF Z(AXIAL) C103 C CERA CCZF1E103Z 25V F 0.01MF Z (AXIAL) C106 C ELECTRO CEXF1H479V 50V RSS 4.7MF (5X11) TP C107...
  • Page 43 ITEM PARTS CODE DESCRIPTION NUMBER REMARK C523 C ELECTRO CEXF1H339V 50V RSS 3.3MF (5X11) TP C524 C ELECTRO CEXF1H478V 50V RSS 0.47MF (5X11) TP C525 C ELECTRO CEXF1H109V 50V RSS 1MF (5X11) TP C526 C CERA CCZB1H561K 50V B 560PF K (AXIAL) C527 C CERA CCZB1H102K...
  • Page 44 ITEM PARTS CODE DESCRIPTION NUMBER REMARK C804 C ELECTRO CEYN2G181P 400V LHS 180MF (25X35) C805 C ELECTRO CEXF1E221V 25V RSS 220MF (8X11.5) TP C806 C ELECTRO CEXF1E221V 25V RSS 220MF (8X11.5) TP C807 C ELECTRO CEXF1H479V 50V RSS 4.7MF (5X11) TP C808 C CERA CCZB1H102K...
  • Page 45 ITEM PARTS CODE DESCRIPTION NUMBER REMARK D716 DIODE D1N4148--- 1N4148 (TAPPING) D717 DIODE D1N4148--- 1N4148 (TAPPING) D718 DIODE ZENER DUZ5R1BM-- UZ-5.1BM D719 DIODE ZENER DUZ5R1BM-- UZ-5.1BM D720 DIODE ZENER DUZ5R1BM-- UZ-5.1BM D721 DIODE D1N4148--- 1N4148 (TAPPING) D801 VARISTOR DSVC471D14 SVC471D14A D802 DIODE BRIDGE DPBS208GU-...
  • Page 46 ITEM PARTS CODE DESCRIPTION NUMBER REMARK J016 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J017 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J018 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING Q-SERIES ONLY J019 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J020 WIRE COPPER 85801065GY...
  • Page 47 ITEM PARTS CODE DESCRIPTION NUMBER REMARK J070 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J071 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J072 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J073 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J074 WIRE COPPER 85801065GY AWG22 1/0.65 TIN COATING J075...
  • Page 48 ITEM PARTS CODE DESCRIPTION NUMBER REMARK JV02 JACK PIN BOARD 4859108350 YSC02P-4100-14A L102 COIL CHOKE 58C9780027 TRF-1201B (0.97 UH) L201 COIL PEAKING 5CPZ560K04 56UH K (AXIAL 10.5MM) L402 COIL H-LINEARITY 58H0000020 L-76(76.5UH) 20¡– ONLY L501 COIL PEAKING 5CPZ220K02 22UH K (AXIAL 3.5MM) L502 COIL PEAKING 5CPZ150K02...
  • Page 49 ITEM PARTS CODE DESCRIPTION NUMBER REMARK R108 R CARBON FILM RD-AZ823J- 1/6 82K OHM J R109 R CARBON FILM RD-2Z820J- 1/2 82 OHM J R111 R CARBON FILM RD-AZ331J- 1/6 330 OHM J R113 R CARBON FILM RD-AZ102J- 1/6 1K OHM J R201 R FUSIBLE RF01Z229J-...
  • Page 50 ITEM PARTS CODE DESCRIPTION NUMBER REMARK R535 R CARBON FILM RD-AZ823J- 1/6 82K OHM J R538 R CARBON FILM RD-AZ331J- 1/6 330 OHM J R539 R CARBON FILM RD-AZ332J- 1/6 3.3K OHM J R540 R SEMI FIXED RV5426103P RH0638C 10K OHM B R541 R CARBON FILM RD-AZ102J-...
  • Page 51 ITEM PARTS CODE DESCRIPTION NUMBER REMARK R719 R CARBON FILM RD-AZ753J- 1/6 75K OHM J R722 R CARBON FILM RD-AZ102J- 1/6 1K OHM J R723 R CARBON FILM RD-AZ512J- 1/6 5.1K OHM J R724 R CARBON FILM RD-AZ432J- 1/6 4.3K OHM J R725 R CARBON FILM RD-AZ223J-...
  • Page 52 ITEM PARTS CODE DESCRIPTION NUMBER REMARK R817 R FUSIBLE RF01Z369J- 1W 3.6 OHM J (TAPPING) 14¡– ONLY RF01Z399J- 1W 3.9 OHM J (TAPPING) 20¡– ONLY R818 R CARBON FILM RD-AZ472J- 1/6 4.7K OHM J R820 R CARBON FILM RD-4Z223J- 1/4 22K OHM J R821 R FUSIBLE RF01Z688J-...
  • Page 53 ITEM PARTS CODE DESCRIPTION NUMBER REMARK SF101 FILTER SAW 5PDSW1013P DSW1013P SP01 SPEAKER 4858306810 3W 16 OHM F2035C03-3 Q-SERIES ONLY 4858305220 3W 8 OHM MSF-2030 T-SERIES ONLY SP01A SCREW TAPPING 7128301011 T2S WAS 3X10 MFZN SP02 SPEAKER 4858306810 3W 8 OHM MSF-2030 T-SERIES ONLY SP02A SCREW TAPPING 7128301011...
  • Page 54 ITEM PARTS CODE DESCRIPTION NUMBER REMARK M822 BAG P.E 00010 BAG INSTRUCTION 4858213800 L.D.P.E T0.05X250X400 00020 BATTERY 486A716200 00030 MANUAL INSTRUCTION 48586537S1 00040 ANT ROD 4850A02510 S3BW216B (L=600 MM) 00050 TRANS ANT MATCHING 4850A00150 MT-02...

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