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Samsung LN46D630 no picture

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    #21
    Re: Samsung LN46D630 no picture

    Sorry obviously I meant the main to the power board. It would be impossible for the backlight to flash with the inverter board disconnected.

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      #22
      Re: Samsung LN46D630 no picture

      Here's a pic of PFC IC ICP801
      Attached Files
      Last edited by Bloup101; 06-15-2019, 07:45 PM.

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        #23
        Re: Samsung LN46D630 no picture

        I took caps CM809 and CM811 off the board but trying to test them with my my DMM without the capacitor mode is difficult. Sometimes no readings or all over the place.

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          #24
          Re: Samsung LN46D630 no picture

          Here's the ICP801 FAN7930B pin out, what is the testing procedure? The power board is out of stock on jimmy...
          Attached Files
          Last edited by Bloup101; 06-15-2019, 07:54 PM.

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            #25
            Re: Samsung LN46D630 no picture

            Remove the board so you can test the board by itself but you MUST be careful since you will be working in the HOT DEALY side of the circuit so you should at least power the board from GFCI outlet in case you make body contact with the board, you will use 470 up to 1K 1/4W resistor between the Standby power supply output pin and the PS-ON pin then power up the board and see what Voltage you have on VCC pin and the GND pin.
            BTW: Make sure to put the parts you remove back in correctly before doing the test.
            Last edited by budm; 06-15-2019, 09:26 PM.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

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              #26
              Re: Samsung LN46D630 no picture

              I found a used power board, problem fixed, thank you.

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                #27
                Re: Samsung LN46D630 no picture

                Just repaired this model. Symptom - turns on and off with chimes but no backlight. Alligator clips on big caps show PFC going to about 250VDC on power on and shutting down quickly. Both fuses F801S and F802S test good and not open. Film cap CI818 tests good in circuit and not bulging on side. DP810 tests good in circuit with multimeter in diode mode. CP820 no reading in circuit and out of circuit measures as a resistor. Replaced with 220pf/3kv spare I had from previous repair and tv is fixed.

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                  #28
                  Re: Samsung LN46D630 no picture

                  Solved here: I just had an LN46D630 come in with no backlight. Has power, and audio, but no backlight. I replaced CP809, CP810 and CP820. It has been powered on for 24 hours, with a few power cycles.

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