Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LE19R71B 09_Troubleshooting

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                                                                  4 Troubleshooting



4 Troubleshooting
4-1 No Power

     Does DC 13V, 5V          No
     appear at CN400?              Check Inverter/Adaptor Board


               Yes

      Does DC 3.3V            No      Check circuits related
     Appear at FT412?                      to IC405.


                Yes

       Does DC 3.3V           No     Check circuits related to
      Appear at FT414?                       IC407.


                Yes

  Check IC701(VCTi), IC703,
    and IC301(SE6181LA)




                                                                               4-1
4 Troubleshooting

4-2 No Picture (PC)


          Power Indicator is black.

           Does a signla appear at
           C106, C107 and C108         No
      1 (R,G,B Input?) Does a signla        Check circutis related CN100.
       appear at C106, C107 and C108
                (R,G,B Input?

                       Yes

          Does a signal appear at
                                       No
        2          3                        Check circuits related CN100.
        R113 and R115(H/V Sync)?


                       Yes

           Does a signal appear at
                                       No
                 4                          Check circuits related IC301.
         1~30 of CN300(LVDS out)?


                       Yes


          Replace LCD PANEL.




4-2
                    4 Troubleshooting


    WAVEFORMS

1               2




3               4




                                 4-3
4 Troubleshooting

4-3 No Picture (TV)

        Does a signal appear at    No
                                          Check TU200(TUNER).
      5 PIN 2 of FT700 (X6965)?


                    Yes


        Does a signal appear at
                                   No   Check the circuits related to
      PIN71,72,73,74,75,78,79,80
                                                  IC701.
              of IC701? 6


                    Yes


       Does a signal appear at     No
                                               Check IC301.
        4 PIN 1~30 of CN300?


                    Yes


          Replace LCD Panel.




4-4
                    4 Troubleshooting


    WAVEFORMS

4               5




6




                                 4-5
4 Troubleshooting

4-4 No Picture (Video/S-VIDEO)

        Power Indicator is off.
        Lamp on, no picture.



      Dose the signal appear at   No     Check a A/V cable and
         R717,R718,R719                      video signal.


                    Yes


      Does the signal appear at   No
                                       Check a connection harness.
       5 PIN(71:80) of IC702?


                    Yes


        Does the digital data
                                  No       Check a IC702.
      appear at output of LVDS
                                       Change a main PCB ass'y.
       4 (RA301~RA303)?


                    Yes


       Check a LVDS cable?        No       Check a IC301.
        Replace lcd panel?             Change a main PCB ass'y.




4-6
                    4 Troubleshooting


    WAVEFORMS

4               5




                                 4-7
4 Troubleshooting

4-5 No Sound (TV)

      Does a signal appear at
                                No
      5 PIN 1,2 of FT700                   Check Tuner.
           (X6965M)?


                    Yes


      Does a signal appear at   No   Check the circuits relevant
      7   R538 and R542?                     to IC701.


                    Yes


      Does a signal appear at   No   Check the circuits relevant
       PIN 2,5,9,16 of IC502
                                             to IC502.
          (SL/SR OUT)?


                    Yes


      Check the Speaker L/R.




4-8
                    4 Troubleshooting


    WAVEFORMS

5               7




                                 4-9
4 Troubleshooting

Memo




4-10

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