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Samsung LN55C630K1FXZA

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    #1

    Samsung LN55C630K1FXZA

    Samsung LN55C630K1FXZA
    Red power light comes on when plugged in but no other TV options work.
    TV has been unplugged for 48 hours with no change in operation.
    This situation occurred overnight with no reason or pre-existing problem.
    Removal of rear cover revealed NO burnt, discolored, bulging, or otherwise damaged components.
    Things tested:
    Power Supply Board, Model BN44-00342B
    Voltage In: 119.5 AC
    BD801S (Rectifier) + AC AC - +162.4 119.5 119.5 -162.4
    Fuses Found FS801S (Good), FS802S (Good)
    Diodes DP810,DM801,DM803,DM804,DM809 All tested good in place.
    Large Caps CP802 & CP803 (450V 100uF) tested at 189.9 and 194.1 tested good, respectively, in place.
    First value is with logic board connected, second value in () is without logic board connected.
    When logic board is connected all values pulse on for 3 seconds and off for 5 seconds with the only exception being a 5V constant on CN802 Pin 16.
    CNI802
    12V Pin 1 13.01V (12.55)
    FB Pin 2 Didn't know what to do so left it alone.
    FB Pin 3 Didn't know what to do so left it alone.
    GND Pin 4 Continuity to chassis ground.
    GND Pin 5 Continuity to chassis ground.
    LD Pin 6 Didn't know what to do so left it alone.
    LD Pin 7 Didn't know what to do so left it alone.

    CN802
    B13V Pin 1 13.11 (12.70)
    LAMP_DET Pin 2 Didn't know what to do so left it alone.
    B13V Pin 3 13.12 (12.70)
    SW_INV Pin 4 Didn't know what to do so left it alone.
    B13V Pin 5 13.12 (12.70)
    PWM_D/M Pin 6 Didn't know what to do so left it alone.
    GND Pin 7 Continuity to chassis ground.
    H_SYNC Pin 8 Didn't know what to do so left it alone.
    GND Pin 9 Continuity to chassis ground.
    GND Pin 10 Continuity to chassis ground.
    B5V Pin 11 5.17 (5.19)
    GND Pin 12 Continuity to chassis ground.
    B5V Pin 13 5.16 (5.19)
    B5V Pin 14 5.17 (5.8)
    13/18VS Pin 15 18.97 (18.25)
    A5V Pin 16 5.18 (5.18)
    13/18VS Pin 17 18.97 (18.24)
    POW_ON/OFF Pin 18 Didn't know what to do so left it alone.

    MAIN LOGIC BOARD:
    All voltages are the same as above on the corresponding PCB cable connection coming from power supply.
    CN701 (Connects to the switches on front panel)
    IR Pin 1 3.291 (2.103)
    GND Pin 2 Continuity to chassis ground.
    A3.3V Pin 3 3.296 (3.305)
    MSCL Pin 4 3.297 (3.304)
    MSDA Pin 5 3.298 (3.305)
    KEY1 Pin 6 3.293 (3.302)
    KEY2 Pin 7 3.294 (3.302)
    LED_STB Pin 8 1.603 (2.865)
    LED_CNTR Pin 9 0.00 (2.865)
    A3.3V Pin 10 3.296 (3.305)

    Voltage Regulators Found (3)
    All pulse power at the same rate as above.

    C11
    17-337
    0949BG
    Pin 1 0.000
    Pin 2 3.305
    Pin 3 5.15

    KIA
    7809F
    952
    Pin 1 13.09
    Pin 2 0.000
    Pin 3 9.06

    KIA
    7805AF
    951
    Pin 1 9.05
    Pin 2 0.00
    Pin 3 5.04

    When cable from power supply to logic board is disconnected the backlight comes on as well. Looking for guidance form you guys to get this up and running. Any help is greatly appreciated.
    Tags: None
    #2
    Re: Samsung LN55C630K1FXZA

    Obviously you got STBY voltage going from the PSU to the main board. You have to check if the main board is sending the PSon when you turn the TV on. Once that voltage is there, the PSU should turn on all the rails. So check what you get on the PSon pin and try to turn on the TV.

    Comment

      #3
      Re: Samsung LN55C630K1FXZA

      .02 when initially plugged in no action taken. 0.985 volts once power button is pushed. Starts the 3/5 cycle at those two voltages. These readings taken at CN802 Pin 18 POW_ON/OFF.

      Comment

        #4
        Re: Samsung LN55C630K1FXZA

        ~ 1V on the PSon pin is not enough voltage for the PSU to turn on. The problem is on the main board. Take the PSon wire off the connector (cutting wire or take the pin out as you don't want to backfeed). Take a 1k Ohm resistor and force the PSU on by putting the resistor between PSon and 5V STBY. As soon as you plug the TV in, it should start. In order to fix the main board, you either replace it or you are going to be down to tracing back the PSon on the main board.

        Comment

          #5
          Re: Samsung LN55C630K1FXZA

          That took care of the power pulses. Nothing happens otherwise. Red standby LED is on. No function through panel buttons or remote.

          Comment

            #6
            Re: Samsung LN55C630K1FXZA

            I guess you need a main board.

            Comment

              #7
              Re: Samsung LN55C630K1FXZA

              That seems like an impossible mission! Everyone seems to be out of stock. Thank you for your assistance.

              Comment

                #8
                Re: Samsung LN55C630K1FXZA

                Ummm... if you don't mind, upload some hi res pics from both sides of the main board? Maybe me or someone else can "see" something

                Comment

                  #9
                  Re: Samsung LN55C630K1FXZA

                  Attached is a picture of the front and back of the main board.
                  Attached Files

                  Comment

                    #10
                    Re: Samsung LN55C630K1FXZA

                    Well, I don't see anything obvious. I looked at the fast track SM for this TV.
                    http://www.toms-service-manuals.com/...h=Submit+Query
                    Maybe look at the low voltage supplies mentioned on page 2.

                    Comment

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