Samsung HP-T5064 picture grainy, dim & washed out

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  • Robb
    Senior Member
    • Sep 2013
    • 159
    • USA

    #1

    Samsung HP-T5064 picture grainy, dim & washed out

    I've got an HP-T5064 with a grainy, dim & washed out picture (see below). The Vs, Va, Vsc & Ve voltages are correct. Adjusting the Vsetup & Vsetdn improved the picture quality a little but it's still very bad.

    My first inclination was that the XSUS is having trouble. Has anyone experienced this before?
    Attached Files
  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA

    #2
    Re: Samsung HP-T5064 picture grainy, dim & washed out

    Thats interesting. What does the black level look like? Id be more inclined to say mainboard.
    Did I leave the soldering iron on?

    Comment

    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA

      #3
      Re: Samsung HP-T5064 picture grainy, dim & washed out

      Perform the test patterns on logic board. Thus will rule out mainboard.
      Did I leave the soldering iron on?

      Comment

      • Robb
        Senior Member
        • Sep 2013
        • 159
        • USA

        #4
        Re: Samsung HP-T5064 picture grainy, dim & washed out

        With oscope settings of 5V/div & 1mS/div with 10X probe I got the readings below. Left pic - YSUS, Right pic - XSUS
        Attached Files
        Last edited by Robb; 12-11-2013, 02:13 PM.

        Comment

        • Robb
          Senior Member
          • Sep 2013
          • 159
          • USA

          #5
          Re: Samsung HP-T5064 picture grainy, dim & washed out

          Black looks washed out too. Not sure what the test patterns on the logic board are.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Samsung HP-T5064 picture grainy, dim & washed out

            Go into user menu and adjust brightness/contrast? Also try selecting different picture mode. Avoid Dynamic mode where possible and try Standard or Movie.

            Post a picture of the control board and the test jumper can be highlighted.
            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

            • Robb
              Senior Member
              • Sep 2013
              • 159
              • USA

              #7
              Re: Samsung HP-T5064 picture grainy, dim & washed out

              Adjusting the picture settings didn't change much. I took a few pics since the flash seemed to get in the way and thanks for the speedy replies.

              Comment

              • Robb
                Senior Member
                • Sep 2013
                • 159
                • USA

                #8
                Re: Samsung HP-T5064 picture grainy, dim & washed out

                .. and forgot to post them.
                Attached Files

                Comment

                • Robb
                  Senior Member
                  • Sep 2013
                  • 159
                  • USA

                  #9
                  Re: Samsung HP-T5064 picture grainy, dim & washed out

                  My apologies. The pics above are of my main board. The logic board is under it. I now see the 6 pins and should be able to figure out how to run the test from other posts.
                  Attached Files

                  Comment

                  • Robb
                    Senior Member
                    • Sep 2013
                    • 159
                    • USA

                    #10
                    Re: Samsung HP-T5064 picture grainy, dim & washed out

                    I used a HDD jumper to jump pins 5 & 6, disconnected the logic board's LVDS cable going to the main board & powered it on. The display patterns looked like eprogramming's Plasma Break In DVD. Accordingly, it appears I have a bad main board, right?

                    Perhaps I should have mentioned that I installed new/used Y Sustain and buffers as they were missing when I acquired it.

                    Comment

                    • Robb
                      Senior Member
                      • Sep 2013
                      • 159
                      • USA

                      #11
                      Re: Samsung HP-T5064 picture grainy, dim & washed out

                      For reference, I posted a comparison of screenshots
                      Attached Files

                      Comment

                      • Robb
                        Senior Member
                        • Sep 2013
                        • 159
                        • USA

                        #12
                        Re: Samsung HP-T5064 picture grainy, dim & washed out

                        I went ahead and ordered a a ZSUS for the unit but since I have no experience with a bad main board I fear that it might the problem. I'll post the outcome when I get the ZSUS installed.

                        Comment

                        • Robb
                          Senior Member
                          • Sep 2013
                          • 159
                          • USA

                          #13
                          Re: Samsung HP-T5064 picture grainy, dim & washed out

                          XSUS swap produced no noticable change. Main board has been ordered.

                          Comment

                          • Robb
                            Senior Member
                            • Sep 2013
                            • 159
                            • USA

                            #14
                            Re: Samsung HP-T5064 picture grainy, dim & washed out

                            Swapping the Main board produced no noticable change. The TV now has a new YSUS, Y Buffers, XSUS and Main board yet the problem persists. I find myself in the regrettable predicament of having more invested in the TV than it is worth.

                            Any ideas? Anyone?

                            Comment

                            • Robb
                              Senior Member
                              • Sep 2013
                              • 159
                              • USA

                              #15
                              Re: Samsung HP-T5064 picture grainy, dim & washed out

                              Back to the beginning - I retested the voltage of Vs, Va, Vsc & Ve; Ve was 15v where the panel label says 91v. Unplugged the power cables to the YSUS & XSUS and Ve voltage is still at 15v. By deduction and accepted logic, the power supply must be the culprit.

                              Comment

                              • Robb
                                Senior Member
                                • Sep 2013
                                • 159
                                • USA

                                #16
                                Re: Samsung HP-T5064 picture grainy, dim & washed out

                                Quick search on a power supply yielded this court settlement identifying this model as having faulty PSUs.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Samsung HP-T5064 picture grainy, dim & washed out

                                  Ve is provided by X-main on these, I thought.
                                  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

                                  • Robb
                                    Senior Member
                                    • Sep 2013
                                    • 159
                                    • USA

                                    #18
                                    Re: Samsung HP-T5064 picture grainy, dim & washed out

                                    Apparently the Samsung psu capacitor problem commonly manifests by the unit not powering up at all. I will double check the Ve when I disconnect the power cable going to XSUS. Maybe I got a bad XSUS.

                                    Comment

                                    • freakaftr8
                                      Badcaps Legend
                                      • Oct 2012
                                      • 3743
                                      • USA

                                      #19
                                      Re: Samsung HP-T5064 picture grainy, dim & washed out

                                      when you disconnected the LVDS cable and you jumper the control board and got the test pattern generator up on the screen did it still look lack of contrast and dim and washed out?
                                      Did I leave the soldering iron on?

                                      Comment

                                      • Robb
                                        Senior Member
                                        • Sep 2013
                                        • 159
                                        • USA

                                        #20
                                        Re: Samsung HP-T5064 picture grainy, dim & washed out

                                        Originally posted by freakaftr8
                                        when you disconnected the LVDS cable and you jumper the control board and got the test pattern generator up on the screen did it still look lack of contrast and dim and washed out?
                                        Yeah, I got the usual lackluster image during the logic board test sequence.

                                        Comment

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