Troubleshooting by khonkaenfocus

VIEWS: 15 PAGES: 6

									                                                                                          4 Troubleshooting



4 Troubleshooting

 Notes:     1. Before troubleshooting, setup the PC 's display as below.
               • Resolution: 1024 x 768
               • H-frequency: 61 kHz
               • V-frequency: 75 Hz
            2. If no picture appears, make sure the power cord is correctly connected.
            3. Check the following circuits.
               • No raster appears: Function PBA, Main PBA, I/P PBA
               • 5V develop but no screen: Main PBA
               • 5V does not develop: I/P PBA
            4. If you push and hold the " (Enter/Source)" button for more than 5 seconds, the monitor
               automatically returns to the factory preset.



4-1 No Power (17", 19")

                                                           Check Function Ass'y.
                                         Yes

        When Pin 4 of CN600 is 0V
         does proper DC 13V, 5V                   No
        appear at Pin 5 and 6, 7 of                           Change IP Board.
           CN600 separately?

                        Yes

       When Pin 1 of IC600 is DC 5V               No
       does proper DC 3.3V appear at                   Check IC600 and related circuit.
              Pin 3 of IC600?

                        Yes

       When Pin3 of IC602 is DC 3.3V              No
       does proper DC1.8V appear at                    Check IC602 and related circuit.
              Pin2 of IC602?

* All locations of this page includes Main PBA.




                                                                                                        4-1
4 Troubleshooting

4-2 No Video (ANALOG 17", 19")

   Check signal cable connection and
                power.



                                                  No
       1   X400 oscillate properly?                     Replace or check related circuit.


                        Yes


           Is there R, G, B input at              No
                                                               Check input part.
           R101, R100 and R103?

                        Yes

       Is there Hsync, Vsync waveform             No
                  2      3                              Check IC400 and related circuit.
            at Pin 100, 1 of IC 400?

                        Yes

       Is there Hsync, Vsync waveform             No
                  2      3                              Check IC200 and related circuit.
            at Pin 43, 44 of IC 200?

                        Yes


       Does the output signal appear              No
                                                        Check CN400 and related circuit.
      at Pin 17~20, 22~27 of CN400?


                        Yes

                                                  No   Check PANEL_EN SIGNAL at R222
         There are DC 5V at Pin 1,
                                                       is High(On:High) and BL_EN signal
            2 and 3 of CN400?
                                                             at R603(ON:Low) is Low

                        Yes

            Replace LCD Panel.


* All locations of this page includes Main PBA.




4-2
                    4 Troubleshooting


    WAVEFORMS

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                                 4-3
4 Troubleshooting

4-3 No Video (DIGITAL 19")

      Check signal cable connection and
                   power.



                                                  No
         1    X400 oscillate properly?                   Replace or check related circuit.



                             Yes

             Is there R, G, B input at
                 4             5                  No
                                                                Check input part.
          R100, R101, R102, R103,
           6 R104 and 6 R105?


                             Yes

                Is there waveform                 No
                         7                                      Check input part.
                  at R106, R107?

                             Yes

           Does the output signal                 No
         appear at Pin 17~20, 22~27                      Check IC400 and related circuit.
                 of CN400?

                             Yes

         There are DC 5V at Pin 28,               No   Check the PANEL_EN signal at R222
           29 and 30 of CN400?                             and BL_EN signal at R603.


                             Yes

              Replace LCD Panel.


* All locations of this page includes Main PBA.




4-4
                    4 Troubleshooting


    WAVEFORMS

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5               6




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                                 4-5
4 Troubleshooting




4-6

								
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