Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LW20M21c chassis VE20EO 06_Troubleshooting

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5 Troubleshooting
5-1 No Power

       Does proper DC 14V/5V       No
  1    appear at Pin 3. Pin 9 of        Check CN803 Pin3, Pin9 in I/P
              CN100?                             Board.


                    Yes


        Does proper DC A5V         No
  2                                       Check IC101 and IC105.
         appear at FT144?



                    Yes


         Does proper B3.3V         No
  3                                             Check IC111.
      appear at Pin 2 of IC111?



                    Yes



       Does proper DC B1.8V        No
  4                                             Check IC112.
      appear at Pin 4 of IC112?



                    Yes


        Does proper DC B8V         No
  5                                             Check IC109.
         appear at FT130?




LW17M24C/LW20M21C                                                       5-1
5 Troubleshooting



                    Yes


       Does proper DC 5V_P      No
   6          appear                 Check IC104.
        at Pin 2 of IC104?


                    Yes



       Does proper DC 9V_S      No
   7                                 Check IC110.
         appear at FT127?



                    Yes


        Does proper DC B5V      No
   8                                 Check IC108.
         appear at FT131?



                    Yes


       Check IC704 and IC802.




5-2                                                 LW17M24C/LW20M21C
                            5 Troubleshooting

    WAVEFORMS
1                   2   3




4                   5   6




7                   8




LW17M24C/LW20M21C                        5-3
5 Troubleshooting

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

         Check C800(TV)
        Check C822(Video)    No
  9                               Check the input signal.
       Check C824(S-Video)
       Check C821(SCART)?


                    Yes


         Check the IC802.




      WAVEFORMS
9




5-4                                                         LW17M24C/LW20M21C
                                                                            5 Troubleshooting

5-3 No Sound

      Does the signal appear at
  Pin 110 (Tuner sound signal) and         (RF) Check Tu01 (TV Tuner).
                                      No
   Pin 113, 114 (VCR sound) and              (Video) Check the CN913.
   Pin 119, 120 (SCART) Pin 117,            (SCART) Check the CN901.
     118 (PC) of IC802 (VCTj)?


                  Yes


    Does the signal appear at Pin     No
                                                   Check IC802.
     123, 124 of IC802 (VCTj)?



                  Yes



       Does the signal appear         No   Check the IC600 (Audio amp)
   at Pin 2, 5 of Pin 16, 19 IC600?         and related circuit of IC600.



                  Yes


        Replace the speaker.




LW17M24C/LW20M21C                                                                        5-5
5 Troubleshooting

Memo




5-6                 LW17M24C/LW20M21C

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