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Samsung PN60E550D1F no audio no image only red LED

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    #1

    Samsung PN60E550D1F no audio no image only red LED

    my friend asked me to look at his tv

    he said that he would have to power it on and off several times to get it to work properly
    then he couldnt get an image just sound
    now that I have the set it has no image or sound just the red standby LED

    when i power it on with the remote the red LED blinks 5 times and goes away

    i notice the green LED blinking on the logic board

    i read 2 posts on here that the main board or the ICE3BR0665J on the ymain may be suspect

    i did the initial voltage testing that i learned on here thanks to many of you guys on this great site

    VS 210v when powered on then drops to 10.45v
    VA 56.9v when powered on and drops to 0.019v
    VE 10.92v
    VSC -0.014v

    i tested connector 804 on the PSU

    1. GND
    2. 0.123v
    3. 0.006v
    4. 0.001v
    5. gnd
    6. -0.003v
    7. 15.32v
    8. gnd
    9. 0.007v
    10. 0.001v
    11. 10.45v
    12. 10.45v

    connector 801 on PSU

    1. 0.123v
    2. 5.23v
    3. gnd
    4. 15.31v
    5. gnd
    6. gnd
    7. 5.18v
    8. 5.18v
    9. gnd
    10. 15.32v
    11. 15.32v
    12 5.18v


    i will try disconnecting the ymain and see if anything changes

    what else should i test?


    thanks
    Attached Files
    Last edited by jose6326; 10-22-2015, 03:29 PM.
    Tags: None
    #2
    Re: Samsung PN60E550D1F no audio no image only red LED

    Pics of the connectors
    Attached Files

    Comment

      #3
      Re: Samsung PN60E550D1F no audio no image only red LED

      Screen is free of cracks / damage?
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

        #4
        Re: Samsung PN60E550D1F no audio no image only red LED

        no cracks no damage
        Last edited by jose6326; 10-22-2015, 05:59 PM.

        Comment

          #5
          Re: Samsung PN60E550D1F no audio no image only red LED

          Check Vscan with buffer removed
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

            #6
            Re: Samsung PN60E550D1F no audio no image only red LED

            Remove Both upper and lower y buffers?

            Comment

              #7
              Re: Samsung PN60E550D1F no audio no image only red LED

              I removed both buffers

              Vscan is -63.4v
              Vs is 210.9v
              Va is 56.8v
              Voltage readings are constant
              Last edited by jose6326; 10-22-2015, 07:28 PM.

              Comment

                #8
                Re: Samsung PN60E550D1F no audio no image only red LED

                Vscan is way to low.
                Did I leave the soldering iron on?

                Comment

                  #9
                  Re: Samsung PN60E550D1F no audio no image only red LED

                  Once I removed the buffers va and vs came back to normal. Im guessing one of the buffers are bad? Or something on the ymain?
                  Last edited by jose6326; 10-22-2015, 07:35 PM.

                  Comment

                    #10
                    Re: Samsung PN60E550D1F no audio no image only red LED

                    You have a problem with your y-sustain.
                    Buffers might be ok, best to check the ICs for low resistance to ground.

                    Comment

                      #11
                      Re: Samsung PN60E550D1F no audio no image only red LED

                      which IC's?

                      thanks for the help

                      Comment

                        #12
                        Re: Samsung PN60E550D1F no audio no image only red LED

                        i read on another post that the IC and blue caps may be the cause

                        sorry for the poor pic quality
                        Attached Files

                        Comment

                          #13
                          Re: Samsung PN60E550D1F no audio no image only red LED

                          Vscan should be closer to -200V
                          unless that is the HIGH scan voltage which may be 150V above -Vscan (approx -50V)
                          Try checking between floating ground and scan outputs of the buffer board, the floating ground is on the connector with many pins connected together, and the HIGH scan output has a few pins joined to each other (basically where you'd check on an older buffer board for a short)
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                          Comment

                            #14
                            Re: Samsung PN60E550D1F no audio no image only red LED

                            I tested vscan where I markes it in the picture

                            Is that the correct test point?
                            Attached Files

                            Comment

                              #15
                              Re: Samsung PN60E550D1F no audio no image only red LED

                              I have a new ICE3BR0665J and I decided to test it on the ohms setting and compare it to the one on the ymain

                              The top 2 legs on the new IC read 0.1 ohms
                              The one on the ymain read OFL
                              Does this mean it is shorted?
                              Attached Files
                              Last edited by jose6326; 10-23-2015, 09:37 PM.

                              Comment

                                #16
                                Re: Samsung PN60E550D1F no audio no image only red LED

                                Tom66 I seen you provided a youtube vid that shows how to test the buffer boards. I put the meter on ohms and put the negative lead on the ymain side connector and ran the positive lead across both sides of the solder points on the buffer side connectors.
                                I did not not get any beeping sounds
                                Im guessing the chips are not shorted

                                Comment

                                  #17
                                  Re: Samsung PN60E550D1F no audio no image only red LED

                                  Try checking between SVC YOUT and Vscan should read approx 150V
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                  Comment

                                    #18
                                    Re: Samsung PN60E550D1F no audio no image only red LED

                                    I get -46.8v when I place the leads on chassis ground and positive lead on the svc_yout test point
                                    Last edited by jose6326; 10-24-2015, 02:00 PM.

                                    Comment

                                      #19
                                      Re: Samsung PN60E550D1F no audio no image only red LED

                                      did i test this correctly?

                                      Comment

                                        #20
                                        Re: Samsung PN60E550D1F no audio no image only red LED

                                        So I replaced the ic chip with a new one and I replaced the 3 blue caps near the ic with some other exact blue caps from another board I had

                                        I connected everything back powered it on and nothing
                                        No image on the screen

                                        I tested the voltages with logic board connected and same results vs and va dropped.
                                        Vsc was at 0.002 with and without logic board connected

                                        I removed the buffer boards and disconnected the logic board va and vs went back to spec but vsc went -63.4v

                                        What else can I do

                                        Comment

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