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              SDNW551001




DVD PLAYER

    DN-W551




                 AUG. 2006
                                       Daewoo DN-W551 Service Manual




Daewoo DN-W551 Service manual

Table of Contents

                                                                                               page
General Section ............................................................................    2
Cautions/Warnings
Safe Warnings
Precautions
Software Upgrade

Circuit Diagram and Component Layout .............................................              5
MPEG IC Block Diagrams
Power supply Circuit Diagram and Component Layout
MPEG Circuit Diagram and Component Layout
Front panel Circuit Diagram and Component Layout

Servicing Procedures ......................................................................     22
Power Supply Trouble Service Flow Chart
Read Disc Trouble Service Flow Chart
Video Trouble Service Flow Chart
Digital Audio Trouble Service Flow Chart
Composite Analogy Audio Trouble Service Flow Chart
Front Control Trouble Service Flow Chart
Remote Control Trouble Service Flow Chart


Parts List ..........................................................................           30
Power parts list
Front panel parts list
MEPG parts list




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                             Daewoo DN-W551 Service Manual


1. General Section
1.1. Cautions/Warnings
       1.1.1. Product Safety Notice
      Parts marked with the symbol         in the schematic diagram have critical
      characteristics.
      Use ONLY replacement pares recommended by the manufacturer. It is
      recommended that the unit be operated from a suitable DC supply or batteries
      during initial check out procedures.




       1.1.2. Leakage Current Check/Resistance Check
           Before returning the unit to the customer, make sure you make either (1)
           a leakage current check or (2) a line to insulated resistance check.
           If the leakage current exceeds 0.5 milliamps, or if the resistance from
           chassis to either side of the power cord is less than 240 K ohms, the unit
           is defective.

    WARNING: DO NOT return the unit to the customer until the problem or
    located and corrected.

   1.2. Safe Warnings
       1.2.1. Protection of Eyes from Laser Beam
           To protect eyes from invisible laser beam during servicing

    DO NOT LOOK AT THE LASER BEAM




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                        Daewoo DN-W551 Service Manual


   1.2.2. Laser Caution
       CAUTION

       Adjusting the knobs, switches, and controls, etc. or taking actions not
       specified herein may result in a harmful emission of laser beams. This
       CD Changer must be adjusted and repaired only by qualified service
       personnel.
       Laser symbol:




THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS 1 LASER PRODUCT.
THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EXTERIOR.


1.3. Precautions
    1.3.1. ESD Precautions in Repairing
        1.3.1.1. Do not apply excessive pressure on the mechanical parts
               (moving pares), including the Pickup Block, as extremely high
               mechanical precision or required in these parts.
        1.3.1.2. When soldering the microprocessor and signal processing IC's,
               use a ceramic soldering iron or a soldering iron whose metal part
               is grounded since they are not resistant to static electricity.
        1.3.1.3. When removing the solder or soldering the laser shorting lands
               for the Pickup Block, use a ceramic soldering iron or a soldering
               iron whose metal part is grounded since the laser diode or not
               resistant to static electricity.
    1.3.2. DVD Loading Unit Precautions when handling the Mechanism Block
        1.3.2.1. Do not loosen any screws in the Pickup Block.
        1.3.2.2. Do not adjust any screws in the Mechanism Block except for "Tilt

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                                 Daewoo DN-W551 Service Manual


                    Adjust Screws", as they are adjusted precisely at the factory.
           1.3.2.3. Replacement of the Pickup Block is impossible. Always replace
                    the Traverse Ass'y when the Pickup Block needed to be replaced.
                    Do not touch the lens or lens holder of the Pickup Block.
           1.3.2.4. The Guide Rails of the Pickup Block are greased. Take care
                    when handing.
           1.3.2.5. When you try to slide the Pickup Block, do not press or pull it
                    directly. Always turn the dive gears with your fingers.
           1.3.2.6. Be sure that the anti-slipping rubber on the turntable or clean. If
                    there is dust or it is greasy, clean the part with the liquid that
                    contains 50% each of alcohol and water.
           1.3.2.7. When removing the Mechanism P.C.B. Ass'y, you need to
                    short-circuit the laser diode shorting lands beforehand.
1.4. Software Upgrade
You can upgrade DVD Player using the software we provide as following step:
    Creating a software upgrade CD
    Use only a new CD-R/CD-RW(not an erased one).
    Give the CD a name of your choice(e.g. version and unit name).
    Burn the unpacked documents on the CD-R/CD-RW.
    The root directory(uppermost level) of the software upgrade CD
Attention: If a failure should occur during the software upgrade (e.g. a mains failure), it may
happen that the units function and a restart of the upgrade function are no longer possible. If this
should be the case, you must replace the intergraded FLASH ICs with preprogrammed ICs (see
corresponding spare parts list).
 Insert the upgrade CD (see corresponding spare parts list) and observe the hints on the display
   and on the screen of the TV set.
 Carry out an initialization of the set.

Displaying the Software Version Number
 Press one after the other the "STOP" and "EJECT" buttons on the unit.
 Press the"OSD" with the remote control.
 Using the cursor buttons on the remote control, select the software version "MICRO Version"
 or "CUSTOMER VERSION" .The respective software version number then is displayed




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                        Daewoo DN-W551 Service Manual


2. Circuit Diagram and Component Layout
2.1. MPEG IC Block Diagrams




                       Fig.2-1 Vaddis MTK1389QE/D




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       Daewoo DN-W551 Service Manual




Fig.2-2 Vaddis MTK1389QE/D block diagram




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                      Daewoo DN-W551 Service Manual


Table1. Vaddis MTK1389QE/D Pin`s operational function description




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                        Daewoo DN-W551 Service Manual




2.2.1Power supply Circuit Diagram and Component Layout (Infinoen)




            Fig 2-1 Power Supply Circuit Diagram

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      Daewoo DN-W551 Service Manual




Fig2-2 Power Supply Assembly Drawing




   Fig 2-3 Power Supply Composite



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                            Daewoo DN-W551 Service Manual


2.3.MPEG Circuit Diagram and Component Layout
2.3.1MPEG Circuit Diagram




                        Fig 2-4 MTK1389QE/D&SDRAM




                        Fig 2-5RF AMPLIFIER&DRIVER



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 Daewoo DN-W551 Service Manual




Fig 2-6 AUDIO&VIDEO FILTER




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     Fig 2-7 MEMORY




  Fig2-8 POWER PORT




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2.3.2.MPEG Assembly Drawing(Fig 2-99)




2.3.3.MPEG Composite (Fig 2-10)




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                        Daewoo DN-W551 Service Manual


2.4. Front panel Circuit Diagram and Component Layout




                    Fig 2-11 Front Panel Circuit Diagram




                  Fig 2-12 Front Panel Assembly Drawing




                      Fig 2-13 Front Panel Composite




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                                Daewoo DN-W551 Service Manual

3. Servicing Procedures
   3.1. 1 Power Supply Trouble Service Flow Chart Infineon



       Power Supply
           Block Trouble


                                         NG
        Check F1 Condition                              Replace F1

                        OK


           Check on DA1/DA2/DA3/DA4                        NG   Replace
           DA5/DA6/DB2/DB3/DB4/DB7/                             DA1/DA2/DA3/DA4DA5/DA6/DB
      DB8                                                       2/DB3/DB4/DB7/DB8
      Output Voltage Condition

                        OK
                                              NG
          Check on U3                                   Replace U3
          Voltage Condition
         Pin1(2.4V)/ Pin2(0V)/ Pin3 (2.6V)
                        NG
                                        NG
           Check on U2                                  Replace U2

                        NG
                                             NG
            Check on U1                                   Replace U1




           Check C104
           Output Voltage




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                            Daewoo DN-W551 Service Manual

3.2. Read Disc Trouble Service Flow Chart
      Read disc problem in a DVD player is a very complicated issue that may
      involve complex issues. This problem is not only relation to the electronic
      circuit, but also very much relation to the operation environment.
      DVD loading unit is a very complicate part that contains big number of ESD
      components, which require specific equipment, tools and technique to repair;
      in general, service technician is not suggested to disassemble the DVD
      loading unit. It is suggest proving the trouble and replacing the complete DVD
      loading unit, instead of repairing the DVD loading unit in local workshop.
      It is suggested to prove the faulty of a DVD loading unit by replacement by a
      good DVD loading unit.
      Before checking the "NO Disc" Trouble, ensure excluding the following
      possibilities:
            The test disc is damage.
            AC power supply voltage dropped below the minimum required level.
            DVD disc region code and color system is not matching to the DVD
            player or system setting.
            Moisture condensed inside the unit. (Power on the unit, without disc
            loaded, for 1/2 to 2 hours).

Service Flow Chart

          Read DISC Trouble




         Check DVD LOADER                   NG
                                                 Replace Connector
          Connector Condition

                      OK


       Replace DVD Loading Unit

                      NG


         Check the MEPG ATAPI                    Check the other Parts by

         I/F Interface Circuit                   Replacement Method




  3.3. Video Trouble Service Flow Chart
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                    Daewoo DN-W551 Service Manual


 3.3.1. Composite Video Trouble Service Flow Chart


 Composite Video Trouble




                            NG
 Check Composite Video                 Replace Composite Video Parts
Output Signal


            OK
                            NG
 Check "SETUP" Item                    See "User Manual"


             OK
                            NG
 Check CP3 Signal                      Replace CP3


             OK
                                 NG
 Check R107 D12 D14                       Replace R107 D12 D14
  Q16 L36 Signal                           Q16 L36

            OK

 Check U2 (Pin175) Signal


             NG


    Replace U2




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                      Daewoo DN-W551 Service Manual


3.3.2. S-Video Trouble Service Flow Chart


        S-Video Trouble




                                NG
 Check S-Video Output Signal               Replace S-Video Parts

                OK

                                NG
   Check "SETUP" Item                      See "User Manual"

                OK
                                NG
      Check CP1 Signal                     Replace CP1


                OK
                                NG
   Check R85/R80 Signal                   Replace R85/80


                OK
                                NG
    Check Q38 Q39 Signal                  Replace Q38 Q39


                OK

Check U2 ( Pin181/182) signal

                NG



   Replace U2




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                            Daewoo DN-W551 Service Manual


3.4.   Digital Audio Trouble Service Flow Chart


         Digital Audio Trouble




                                   NG
         Check "SETUP" Item                    See "User Manual"


                    OK
                                   NG
        Check Optical/Coaxial
           Out Signal                          Replace Optical/Coaxial


                    OK
                                   NG
         Check CP3/CP4 Signal                 Replace CP3/CP4


                    OK
                                   NG
   Check R113/R114/R117                  Replace R113/R114/R117/C155
     C155 Signal

            OK
                                   NG
       Check U2                               ReplaceU2




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                           Daewoo DN-W551 Service Manual


3.5 Composite Analogy Audio Trouble Service Flow Chart


       Composite Analogy Audio Trouble


                                   NG
        Check CP3 Signal                        Replace CP3

                           OK
                                    NG
      Check Q18/Q19/Q20/Q21                   Replace Q18/Q19/Q20/Q21
    /Q25/Q26                                  /Q25/Q26

                       OK
       Check U11/U13/U14 [Pin4(-12V),         NG     Replace U11/U13/U14
        Pin8(+12V)]

                           OK
                                               NG
       Check U16(Pin19/20/23/24)                     Replace U16
         26/27)

                        OK
         Check U2(Pin 163/164/165) NG               Replace U2




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                         Daewoo DN-W551 Service Manual


3.6. Front Control Trouble Service Flow Chart


             Front Control Trouble


                                               NG
       Check between CN1 Connection                       Replace CN1

                  OK
                                 NG
          Check U1 pin7 Vol 5V             Check EC1 C1

                  OK                    OK                     NG

           Check LED Array            Replace U1          Replace EC1 C1




           Replace LED Array




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                            Daewoo DN-W551 Service Manual


3.7. Remote Control Trouble Service Flow Chart


   Remote Control Trouble


                               NG                      NG
    Check Remote Control             Replace Battery        Replace Control

                   OK
                                    NG
    Check IR (Pin1 )Voltage              Check Power Supply

                   OK


    Check IR (Pin3) Output Signal

                   NG

          Replace IR




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                             Daewoo DN-W551 Service Manual


4. Parts List

4.1. 1Power parts list Infinoen


 NO.         PART NO.                DESCRIPTION           QTY           LOCATION
                                     Carbon Resistor
  1    20-200132-03100            1/6W 1K



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