Service Manuals, User Guides, Schematic Diagrams or docs for : RCA LCD RCA_L37WD250_L42WD250_L46WD250_SI_Troubleshooting_[SM]

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RCA_L37WD250_L42WD250_L46WD250_SI_Troubleshooting_[SM]


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   Dead Set                              Start
Troubleshooting


                                    Measure Pin 3
                                     of CON 2 for
                                        +5Vdc.




                                                                                                BK001
                                                              Suspect Main
                                    +5V present?       NO
                                                                 SMPS                 Function     DC Voltage
                                                                                      Power                2.7
                                                                                      Channel +            1.4
                                         YES
                                                                                      Channel -           0.84
                                                                                      Volume +             2.2
                                    Press Pow er                                      Volume -             1.8
                                   Switch, monitor
                                   CON 3 Pin 7 for                                    Menu                 2.5
                                        +5V                                           No Key Press         2.9


                                                                                     Using the chart to the right,
                                                                                    verify the correct voltage on
                                    +5V present?                NO
                                                                                   pin 6 of BK001 for each FPA key
                                                                                                press.


                                         YES


                                     Check CON 3
                                                                                              Voltages
                                    Pin 1 for +12V                           YES
                                                                                              Correct?          NO
                                   Pins 5/6 for +24V




                                                                                                          Troubleshoot
             Suspect Main              Voltages                        Troubleshoot
                             NO                                                                            FPA and Key
                SMPS                   Correct?                        Digital Board
                                                                                                           scan circuit



                                         YES


                            Monitor BP700 for the following
                                       voltages.
                                    Pins 1/2 for +5V
                                    Pin 4 for +8.6V
                                   Pins 6/7 for +12V




                                       Voltage                Suspect Power
                                                       NO
                                       Correct?               Interface Board



                                         YES


                                    Suspect Digital
                                        Board
Video OK                                 Start
No Audio

                                      With the set
                                     Powered On,
                                     check BA001
                                     Pin 1 for +12V




                                       Voltage              Suspect Main
                                                       NO
                                       present?             SMPS Board



                                         YES


                                     Check BA002
                                    Pins 1 and 3 for
                                      audio signal




                                        Signal               Suspect Digital
                                                       NO
                                       present?                 Board




                                         YES




                                     Check BA002
                                     Pins 5 for 0V
                                     Pin 6 for-0.2V




                                                                                Check the Sound
                                       Voltages              Suspect Digital    Menu. Make sure
                                                       NO
                                       present?                 Board           Internal Speakers
                                                                                   is checked.



                                         YES



                                    Check for Signal
                                     on BA003 and
                                        BA004




                                        Signal              Suspect Audio Amp
           Suspect Speakers   YES                      NO
                                       present?                  Board
Sound OK         Start
No Video

             With the set
             Powered On,
             check 1M03
            Pin 1 for +8.5V
             Pin 3 for +5V




             All voltages           Suspect Digital
                               NO
              present?                 Board



                 YES


             Check CON 3
           Pins 5/6 for +24V




               Voltages                Suspect Main
                               NO
               present?                SMPS Board




                 YES




            Check signals
              on 1G50




                Signals               Suspect Digital
                               NO
               present?                  Board




                 YES




             Suspect LCD
                Panel



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