Service Manuals, User Guides, Schematic Diagrams or docs for : LENCO LCD-TV TFT700 lenco_tft700_sch

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                                                                                             Service Manual of TFT-700



                                   Service Manual of TFT-700
               Damageable Parts
               CSC2600, B1203,CPU, High-Voltage fuse N25,High-Voltage Circuit Audion, Transformer,
               On/Off switch, Flat Cable, LCD Panel

               1. Scenario: No sound, No picture, No light
                                   Whether Power LED is working
                                   in RED


                                                     YES
                                                                       Press POWER button and test pin 29 of
                                                                       CPU, see if voltage change from 05V or
                                                                       50V
                                         NO
                       Test whether CPU 5V
                       power supply is OK
                                                                                 YES          NO Is Button input pin
                                                                                                       voltage right?
                                          NO
                                                                     Is CPU C1815,B1203 and
              Is IC M61260pin32 voltage OK?                          back power circuit shorted?             NO         YES          Change CPU


                                  YES   Test circuit of CPU pin 22                                            Original Cause
                                        to IC M61260 pin 32
                       NO                                                NO        YES Change            B1203
           Is IC M6260pin12 voltage right?                                                  C1815 to avoid short

                                                    Is all circuit coming out from power supply voltage right?

                         NO YES         IC M61260 Bad


           Is IC M61260 pin 12 power supply circuit OK?              YES         NO
                                                                                          Repair Power supply or relative circuit.

                                        NO                                                           NO       Change      High-voltage     circuit
Is there High - Voltage output?                      Check     High-Voltage     circuit    N25
                                                     broken?                                                  audion or high-voltage transformer




               YES



          Change LCD Panel


                                                                      -1-
                                                                Service Manual of TFT-700



2. Scenario: Abnormal Color


               Is IC M61260 pin14,15,16 output voltage OK?




                                        NO         Is IC M61260 has power supply?
                                YES
Is IC CSC2600 Pin6,8,9,29,32,35 voltage OK?
                                                                       YES
                                                         Change IC M61260

                             NO
           YES                                Change defect parts in loop
                                              circuit.
     Change Circuit cable of
     LCD Panel


               NO


     Is circuit around IC CSC2600 OK?




            YES

      Change IC CSC2600




                                             -2-
                                                                     Service Manual of TFT-700



3. Scenario: No Sound, with Light, Black Screen


                   Is power supply               to    IC   M61260     pin
                3,4,12,39,40 alright?




                                                      NO     Check Power Supply

                                         YES
           Is IC M61260pin 24,26,27,34 working alright?




                                    NO
                                                            Is CPU circuit and relative circuit
                                                            around IC M61260 pin 34 alright?
                            YES

       Is voltage of IC M61260pin 14,15,16 alright?




                                        NO                  Change IC M61260

                           YES
          Is voltage of IC CSC2600pin 6,8,9 alright?


                                               NO
                                                            Check circuit around IC CSC2600
                           YES
                         Change LCD Panel




                                                      -3-
                                                      Service Manual of TFT-700



4. Scenario: Horizontal and Vertical Not in Sync


                 Is IC M61260+5V +8Vwell powered?




                                         NO     Repair Power Supply

                             YES

               Is relative circuit around IC M61260
               pin 5, 11 alright?




                                         NO
                                                   Check relative circuit around
                                                   pin 5,11
                            YES

                                     H/V Sync
          Check circuit around IC 4001
          circuit




                            YES
            Check LCD Panel pin 6 alright?




                             YES
                     Change Flat Cable


                             NO


                          Change LCD Panel


                                          -4-
                                                            Service Manual of TFT-700



5. Scenario: White Light



             Check switches power +5V +8V +17V 



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