Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LW20M11CXXEC 20031016132210843_5_trouble_474

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5 Troubleshooting
5-1 No Power

      Does proper DC 14V/5V appear at   No
  1                                          Check FT101 and FT103.
        DC jack connected to CN120?



                      Yes


            Does proper DC 5V           No
  4                                          Check IC103 and IC102.
         appear at Pin 2 of IC102?



                      Yes


           Does proper DC 2.5V          No
  2                                               Check IC106.
         appear at Pin 2 of IC106?



                      Yes



           Does proper DC 14V           No
  3                                               Check IC108.
         appear at Pin 5 of IC108?



                      Yes


            Does proper DC 5V           No
  1                                               Check IC108.
             appear at FT107?



                      Yes


               Check IC401.




LW20M11C                                                              5-1
5 Troubleshooting

        WAVEFORMS

 1                  2   3




 4




5-2                         LW20M11C
                                                                     5 Troubleshooting

5-2 No Picture (TV, Video, S-Video, DVD)

             Check C452 (TV)
            Check C453 (Video)    No
     5                                     Check the input signal.
           Check C454 (S-Video)
            Check C456 (DVD)?


                     Yes


             Check the IC401.




         WAVEFORMS

 5




LW20M11C                                                                          5-3
5 Troubleshooting

5-3 No Sound

          Does the signal appear at
       Pin 67 (Tuner sound signal) and    No     (RF) Check the Pin 8 of CN701.
        Pin 53, 54 (Video sound) and           (Video Sound) Check the CN903.
           Pin 56, 57 (DVD Sound)               (DVD Sound) Check the CN905.
            of IC501 (MSP3425)?


                       Yes


      Does the signal appear at Pin 27,   No    Check the Pin 3 of IC501 and
          28 of IC501 (MSP3425)?                  related circuit of IC501.


                       Yes



           Does the signal appear         No    Check the IC651 (Audio amp)
      at Pin16, 19, 2 and 5 of CN651?            and related circuit of IC651.



                       Yes


            Replace the speaker.




5-4                                                                               LW20M11C

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