Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LW20M22CP 09_Troubleshooting

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                                                                                       4 Troubleshooting



4 Troubleshooting
4-1 First Checklist for Troubleshooting

1. Check the various cable connections first.
   - Check to see if there is a burnt or damaged cable.
   - Check to see if there is a disconnected cable connection or a connection is too loose.
   - Check to see if the cables are connected according to the connection diagram.


2. Check the power input to the Video Board.


3. Check the voltage in and out between the SMPS          Video Board, between the SMPS           X, Y
   Drive Board, and between the Logic Boards.




                                                                                                    4-1
4 Troubleshooting

4-2 Checkpoints by Error Mode

4-2-1 No Power



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

                     Yes


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

                     Yes


          Does proper B3.3V         No
  3                                             Check IC102.
       appear at Pin 2 of IC111?

                     Yes

        Does proper DC B1.8V        No
  4    appear at Pin 4 of Q802,              Check Q802, Q803.
               Q803?

                     Yes


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

                     Yes

        Does proper DC 5V_P         No
   6           appear                           Check IC108.
         at Pin 2 of IC108?

                     Yes

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

                     Yes


         Does proper DC B5V         No
   8                                            Check IC120.
          appear at IC120?


                     Yes


       Check IC800 and IC400.




4-2
                        4 Troubleshooting

    WAVEFORMS
1               2   3




4               5   6




7               8




                                     4-3
4 Troubleshooting

4-2-2 No Picture (TV, Video, S-Video, Component)


               Check R882(TV)
              Check C884(Video)          No
  9                                           Check the input signal.
          Check C851, C852(S-Video)
      Check C511,C513,C515(Component)?


                       Yes


      Check the IC800,IC500.




      WAVEFORMS
9




4-4
                                                                          4 Troubleshooting

4-2-3 No Sound


     Does the signal appear at
                                          Check the TU01 (TV Tuner)
       C883,C880(TV) and          No
       C849, C850(PC) and              Check the CN913 (Video, S-Video)
  C881,C882(Component) Pin 117,         Check the CN901 (Component)
         of IC800 (VCTj)?                      Check the CN909


                  Yes


   Does the signal appear at      No
                                               Check IC800.
         R858, R859?



                  Yes


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


                  Yes


      Replace the speaker.




                                                                                       4-5
4 Troubleshooting

Memo




4-6

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