Daewoo PF2720 Service Manual
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Daewoo PF2720 Service Manual

Daewoo PF2720 Service Manual

Chassis no. ch-16cd
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FILE NO. SM-CTV-O-056
COLOR TELEVISION
SERVICE MANUAL
MODEL NO. PF2720/PF2730
PF3220/PF3230
CHASSIS NO. CH-16CD
Please read this manual carefully before service.

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  • Page 1 FILE NO. SM-CTV-O-056 COLOR TELEVISION SERVICE MANUAL MODEL NO. PF2720/PF2730 PF3220/PF3230 CHASSIS NO. CH-16CD Please read this manual carefully before service.

  • Page 2: Table Of Contents

    SERVICE MANUAL TABLE OF CONTENTS SAFETY INSTRUCTIONS AND MAINTENANCE ........1 X-Ray Radiation Precaution ....................1 Safety Precaution ........................ 1 Product Safety Notice ......................2 Maintenance ......................SPECIFICATIONS ......................4 KEY ICS AND ASSEMBLIES ................. 4 SYSTEM BLOCK DIAGRAMS ................5 Structure Block Diagram ....................

  • Page 3: Safety Instructions And Maintenance

    SAFETY INSTRUCTIONS AND MAINTENANCE “ WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RAY RADIATION ” “ ” “ ” PRECAUTION SAFETY PRECAUTION PRODUCT SAFETY NOTICE INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage.

  • Page 4: Product Safety Notice

    SERVICE MANUAL 4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W). 5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoid electronic gun magnetized and decrement in convergence of the CRT. 6.

  • Page 5: Maintenance

    SERVICE MANUAL Safety Symbol Description The lightning symbol in the triangle tells you that the voltage inside this product may be strong enough to cause an electric shock. Extreme caution should be exercised when working on the TV with the back removed. This is an international hazard symbol, telling you that the components identified by the symbol have special safety-related characteristics.

  • Page 6: Specifications

    SERVICE MANUAL SPECIFICATIONS MODEL PF2720 PF2730 PF3220 PF3230 Television System NTSC-M Channel Coverage VHF 2-13, UHF 14~69 Mid Band (A-8~A-1, A~I)/Super Band (J~W) Cable TV Coverage Hyper Band (AA~ZZ, AAA, BBB)/Ultra Band (65~94, 100~125) Channels Preset Antenna Input 75 ohm (unbalanced) 21.26x 15.94 in...

  • Page 7: System Block Diagrams

    SERVICE MANUAL SYSTEM BLOCK DIAGRAMS Structure Block Diagram...

  • Page 8: Block Diagram For Supply Voltage System

    SERVICE MANUAL Block Diagram for Supply Voltage System...

  • Page 9: Service Data

    SERVICE MANUAL SERVICE DATA Technical Data of Key ICs TDA937X (N201) ratio), black stretching and Dynamic Skin 1. General Description Tone Control The various versions of the TDA937X PS/N2 • Integrated chroma band-pass filter with series combine the functions of a video switchable centre frequency processor together with a μ-Controller and •...
  • Page 10 SERVICE MANUAL 3.Pin...
  • Page 11 SERVICE MANUAL 4.Block Diagram...
  • Page 12 SERVICE MANUAL 5.Refer to Table 2 about Functions and Service Data of the IC's Each Pin.
  • Page 13 SERVICE MANUAL AT24C16 (N202) EEPROM 1. Features ・ Low Voltage and Standard Voltage Operation Devices Available ・ 5.0 (V = 4.5V to 5.5V) 8-Pin and 14-Pin JEDEC SOIC and 8-Pin PDIP 2.7 (V = 2.7V to 5.5V) Packages 2.Description 2.5 (V = 2.5V to 5.5V) 1.8 (V = 1.8V to 5.5V)
  • Page 14 SERVICE MANUAL 3.Block Diagram Fig.6 4.Refer to Table 3 about Functions and Data of the IC’s Pins.
  • Page 15 SERVICE MANUAL MSP3440G-B8 (NB01) Multistandard Sound Processor Family Other processed standards are the Japanese Release Note: Revision bars indicate significant FM-FM multiplex standard (EIA-J) and the FM changes to the previous edition. The hardware Stereo Radio standard. and software description in this document is Current ICs have to perform adjustment valid for the MSP34X0G version B5 and procedures in order to achieve good stereo...
  • Page 16 SERVICE MANUAL TDA8350 (N401) DC-coupled Vertical Deflection and East-West Output Circuit ・ High EMC immunity due to common mode 1. Features inputs ・ Few external components ・ Temperature (thermal) protection ・ Highly efficient fully DC-coupled vertical output ・ East-West output stage with one single bridge circuit conversion resistor.
  • Page 17 SERVICE MANUAL TDA8944J (N361) Audio Power Amplifier 1. General Description 2. Features The TDA8944J is a dual-channel audio power Few external components amplifier with an output power of Fixed gain 2 ´ 7 W at a n 8 W load and a 12 V supply. The Standby and mute mode circuit contains two Bridge Tied Load No on/off switching plops...
  • Page 18 SERVICE MANUAL TA1219AN (N901) Audio/Video Switching IC for TVs The TA1219AN is an audio/video switching IC for TV Sets. Conforming to I C bus standards, it allows you to perform various switching operations through the bus lines by using a microcomputer. Furthermore, since the presence of a signal on its sync signal output pin can be determined by a microcomputer , it is possible to check each input/output channel (self-diagnosis).
  • Page 19 SERVICE MANUAL 2. Block Diagram Fig.11 3. Refer to Table 7 about Functions and Service Data of TA1219AN’s Pins.
  • Page 20 SERVICE MANUAL TC90A49P (N902) COMB Filter 1. Features TV format : NTSC (3.58), PAL, M-PAL, and N- Dynamic comb filter Vertical edge enhancement circuit PLL 8 × multiplier circuit Internal 8-bit 4 fsc AD converter Internal 8-bit precision 8 fsc DA converter (2 ch) Sync tip clamp circuit Internal 4H-line memory I C bus interface...
  • Page 21 SERVICE MANUAL TDA6108JF (NY01) Triple Video Output Amplifier 2. General Description 1. Features ・Typical bandwidth of 9.0 MHz for an output The TDA6108JF includes three video output amplifiers in one plastic signal of 60 V (peak-to-peak value) ・High slew rate of 1850 V/µS DIL-bent-SIL 9-pin medium power ・No external components required (DBS9MPF)package (SOT 111-1), using...
  • Page 22 SERVICE MANUAL STR-G8626 (IC801) The Series STR-G 86626/5653/F6654 is specifically designed to satisfy the requirements for increased integration and reliability in off-line quasi-resonant flyback converters. The series incorporates a high-precise error amplifying control and drive circuit with discrete avalanche-rated power MOSFET, featuring fewer external components, small-size and standard power supply.
  • Page 23 SERVICE MANUAL 　 3. Pin Configuration and Functions Fig.17 3.1) Pin function for STR-G5653/8626 Function Description Pin No. Symbol MOSFET drain MOSFET source Ground Supply voltage input for control circuit OCP/FB Over-current protection detection signal/ voltage-limiting signal input 3.2) Pin function for STR-F6654 Function Description Pin No.

  • Page 24: Service Data Of Key Ics

    SERVICE MANUAL SERVICE DATA OF KEY ICs Table 2 Functions and Service Data of TDA9379 (N201)’s Pins Digital Multimeter Functions Description Reference Positive Negative Voltage (V) Resistance (20KΩ) Resistance (20KΩ) ∞ ∞ Port 1.3 or Counter/Timer 1 input Port 1.6 or I C-bus clock line Port 1.7 or I C-bus data line...
  • Page 25 SERVICE MANUAL Decoupling sound demodulator or SIF input 2 ∞ ∞ Ground 2 for TV processor 2.32 ∞ ∞ Narrow band PLL filter or AGC sound IF Automatic Volume Levelling / sound IF input / 11.2 10.9 subcarrier reference output / audio ∞...
  • Page 26 SERVICE MANUAL Table 3 Functions and Service Data of AT24C16 (N202)’s Pins Digital Multimeter Positive Resistance Negative Resistance Functions Description Reference Voltage (20KΩ) (20KΩ) Address input Address input Address input Common ground Serial data 6.37 6.37 6.44 Serial clock input Write protect 3.03 3.02...
  • Page 27 SERVICE MANUAL 3.81 13.8 5.92 3.79 13.8 5.91 0.00 0.00 0.00 12.8 5.91 SC1-OUT-R 3.79 12.8 5.92 SC1-OUT-L ∞ 7.28 6.04 CAPL-A ∞ 8.26 4.59 AHVSUP ∞ 6.53 6.04 CAPL-M 0.00 0.00 0.00 AHVSS ∞ 3.74 6.02 ABNDC ∞ 3.77 ∞...
  • Page 28 SERVICE MANUAL Table 6 Functions and Service Data of TDA8944J (N361)’s Pins Digital Multimeter Negative Resistance Functions Description Reference Voltage Positive Resistance (20KΩ) (20KΩ) ∞ ∞ 7.98 Negative loudspeaker terminal 1 Ground channel 1 14.9 Supply voltage channel 1 ∞ ∞...
  • Page 29 SERVICE MANUAL RinS2 5.11 7.62 5.86 CinS2 5.12 7.66 5.64 I/01 7.98 5.43 I/02 0.02 5.44 0.00 0.006.98 0.00 6.98 4.47 3.77 6.98 4.46 Sync out 0.02 7.88 5.45 Address 0.00 0.00 0.00 VinV2 5.11 7.53 5.81 LinTV2 7.64 5.82 7.76 5.82 RinV2...
  • Page 30 SERVICE MANUAL Clock input pin. ∞ ∞ 2.54 Connect the APC filter in the 8 fsc PLL circuit ∞ ∞ PLL power supply 4.98 0.55 0.55 ADC, DAC, and PLL GND (analog). Outputs chrominance signal. ∞ ∞ 2.25 DAC output range D upper limit voltage. 3.14 0.57 0.57...

  • Page 31: Waveforms Of Key Points

    SERVICE MANUAL Waveforms of Key Points N201’s Pin2 N201’s Pin3...
  • Page 32 SERVICE MANUAL N201’s Pin22 N201’s Pin32...
  • Page 33 SERVICE MANUAL N201’s Pin33 N201’s Pin34...
  • Page 34 SERVICE MANUAL N201’s Pin38 N201’s Pin42...
  • Page 35 SERVICE MANUAL N201’s Pin43 N201’s Pin59...
  • Page 36 SERVICE MANUAL NB01’s Pin47 NB01’s Pin52...
  • Page 37 SERVICE MANUAL N401’s Pin5 N401’s Pin9...
  • Page 38 SERVICE MANUAL N401’s Pin11...

  • Page 39: Adjustments

    SERVICE MANUAL ADJUSTMENTS Set-up Adjustments ●The following adjustments should be made when a complete realignment is required or a new CRT is installed. Perform the adjustments in order as follows. 1. Color purity 2. Convergence 3. White Balance Note： The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to Fig.
  • Page 40 SERVICE MANUAL Fig. 19 2. Convergence Adjustment Note: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. ●Center convergence adjustment 1) Receive the crosshatch test pattern. 2) Set the brightness and contrast properly. 3) Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed on the center area of the screen.

  • Page 41: Circuit Adjustments

    SERVICE MANUAL Tighten the screw firmly to fix the yoke and check if the yoke is fixed. 9) Stick three adhesive tapes on wedges as shown in Fig. 18. 4-pole Magnet Movement 6-pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke Up (or Down) Incline the Yoke Right (or Left) Circumference Convergence by DEF Yoke...
  • Page 42 3) The high voltage tested should be 29±1KV (For 29” CRTs) or 31±1KV (for 34” CRTs). 4) Set the brightness to minimum or maximum, and ensure high voltage not beyond limitation of 32KV (for Samsung and LG 29” CRTs), 33 KV(for Daewoo and Toshiba 29” CRTs) or 35KV (for 34” CRTs).

  • Page 43: Service Mode And Bus Data

    SERVICE MANUAL Service Mode and Bus Data 1. How to Enter the Service Mode with the Remote Control 1) Decrease volume to 0. 2) Press the MUTE button on the remote control and VIDEO button on the TV at the same time. 3) Adjust the TV with the MENU SELECT buttons on the remote control.
  • Page 44 SERVICE MANUAL YDFN Luminance delay Set to optimum Video automatic gain control UOC volume control IFFS Picture intermediate frequency HDOL Cathode drive voltage HD-B Brightness of blue back Automatic gain control velocity VG2B FEAT See “Option Set”. FEAT1 See “Option Set”. TRE1 Treble Max.
  • Page 45 SERVICE MANUAL SCIN AV input volume FMIN Sound frequency modulation WOCF Woofer Mid. CON1 Contrast Max. CON2 Contrast Min. BRI1 Set to optimum Brightness Max. BRI2 Set to optimum Brightness Min. COL1 Color Max. COL2 Color Min. SHP1 Sharpness Max. SHP2 Sharpness Min.
  • Page 46 SERVICE MANUAL WOOFER_VOL Super woofer volume control: 1→Yes, 0→No TIMER: 1→Yes, 0→No OP-TIMER ENGLISH English: 1→Yes, 0→No PORTUGUESE Portuguese: 1→Yes, 0→No FRENCH French: 1→Yes, 0→No SPANISH Spanish: 1→Yes, 0→No MSP3440G Auto volume control: 1→Yes, 0→No -AVC MSP3440G- MDB: 1→Yes, 0→No MSP3440G- Five equalizer: 1→Yes, 0→No TONE...
  • Page 47 ② It is required to check if the data comply with the function requirements of your TVs. For example: ③ For PF2720 and PF3220 models, OP1 is set to 158, OP7 to 175 and OP8 to 100 when using TDA9375 or OP1 is set to 158, OP7 to 175 and OP8 to 100 when using TDA9379.

  • Page 48: Troubleshooting Flow Charts

    SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS 1.Power On/Off 1.1 The power indicator lights but with no raster and sound 1.2 The SMPS has no voltage output.
  • Page 49 SERVICE MANUAL 1.3 The SMPS is always in the Standby mode. 2. Control System 2.1 The power indicator lights, but the CPU cannot enter the Operation mode after power- on again. 2.2 Channel number remains unchanged during auto program.
  • Page 50 SERVICE MANUAL 3. Video Signal Processor 3.1 No color 3.2 The color is abnormal. 4. Horizontal/Vertical Scan Circuit 4.1 No raster...
  • Page 51 SERVICE MANUAL 4.2 Raster is displayed as a horizontal bright line on the screen. 4.3 The field amplitude of raster is not enough. 4.4 East-west pincushion distortion...
  • Page 52 SERVICE MANUAL 5. Audio System 5.1 No sound but with picture...
  • Page 53 SERVICE MANUAL 6. Video System 6.1 No picture...
  • Page 54 APPENDIX 1: Circuit Diagram for PF2720/PF2730 (1)
  • Page 55 APPENDIX 2: Circuit Diagram for PF2720/PF2730 (2) Note: VM board for PF2730 only...
  • Page 56 APPENDIX 3: Circuit Diagram for PF3220/PF3230 (1)
  • Page 57 APPENDIX 4: Circuit Diagram for PF3220/PF3230 (2) Note : VM Board for Pf3230 only...
  • Page 58 APPENDIX 4: Main PCB Layout for PF2720/PF2730/PF3220/PF3230...
  • Page 59 APPENDIX 6: AV PCB Layout for PF2720/PF2730/PF3220/PF3230...
  • Page 60 APPENDIX 7: Auxiliary PCBs Layout for PF2720/PF2730/PF3220/PF3230 (3) CRT RGB PCB VM PCB Power PCB...
  • Page 61 APPENDIX 8: Final Wiring Diagram for PF2720 Remote Sensor PCB Assembly Remote Sensor PCB Assembly Key PCB Assembly Key PCB Assembly Side-set AV PCB Assembly Side-set AV PCB Assembly KK06 KK06 KK05 KK05 KK04 KK04 KK03 KK03 KK02 KK02 KK01...
  • Page 62 APPENDIX 9: Final Wiring Diagram for Pf2730 Remote Sensor PCB Assembly Remote Sensor PCB Assembly Key PCB Assembly Key PCB Assembly Side-set AV PCB Assembly Side-set AV PCB Assembly KK06 KK06 KK05 KK05 KK04 KK04 KK03 KK03 KK02 KK02 KK01 KK01 TV/AV TV/AV...

  • Page 63: Appendix

    APPENDIX 10: Exploded View for PF2720/PF2730 plasticene Tapping screw M6X35W Tapping screw 4X20BAHCh Tapping screw 4X16BTHCh Washer C-UL label Real label Admonition label Distance clip Back cover Front cover assembly CRT assembly Chassis assembly Serial Parts Quantity...
  • Page 64 APPENDIX 11: Final Wiring Diagram for Pf3220 Remot e Sensor PCB Assembl y Remot e Sensor PCB Assembl y Key PCB Assembly Key PCB Assembly Side-set AV PCB Assembly Side-set AV PCB Assembly KK06 KK06 KK05 KK05 KK04 KK04 KK03 KK03 KK02 KK02...
  • Page 65 APPENDIX 12: Final Wiring Diagram for Pf3230 Remote Sensor PCB Assembly Remote Sensor PCB Assembly Key PCB Assembly Key PCB Assembly Side-set AV PCB Assembly Side-set AV PCB Assembly KK06 KK06 KK05 KK05 KK04 KK04 KK03 KK03 KK02 KK02 KK01 KK01 TV/AV TV/AV...
  • Page 66 APPENDIX 13: Exploded View for PF3220/PF3230 Soldering agent Tin solder Q04-3 white nitro magnetic paint Tapping screw 4X20BAHCh Tapping screw 4X16BTHCh C-1 notched washer I hexagon nut A and B M8 Washer C-UL label Real label C-UL label Real label Admonition label Admonition label Distance clip...

This manual is also suitable for:

Pf2730Pf3220Pf3230

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