Insignia NS-50P650A11 Sparkles VA won't adjust

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  • SHADOW3277
    Senior Member
    • Jun 2014
    • 123
    • United States
    #1

    Insignia NS-50P650A11 Sparkles VA won't adjust

    Hello. Have another TV that was saved from my local recycling center. When turned on, it has sparkles on the entire screen over the picture. The VS panel voltage is 206 and that is what I get at the TP. The VA voltage is supposed to be 55 but it will only go between 33-37. I jumped the control board after unhooking the LVDS and I get the test patterns and the sparkles remain. I'm guessing the Y-Main is bad? The TV uses Samsung parts. Thanks for your help.
    Attached Files
    Last edited by SHADOW3277; 09-19-2015, 10:22 AM.
    Tags: None
    • Alastair E
      Chief Womble
      • Mar 2013
      • 1963
      • U.K.
      #2
      Re: Insignia NS-50P650A11 Sparkles VA won't adjust

      How is VSC and -Vy...?
      TELEFIX

      How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
      http://www.irf.com/technical-info/appnotes/an-1088.pdf
      PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

        Comment

        • SHADOW3277
          Senior Member
          • Jun 2014
          • 123
          • United States
          #3
          Re: Insignia NS-50P650A11 Sparkles VA won't adjust

          Originally posted by Alastair E
          How is VSC and -Vy...?
          VSC jumps anywhere between 218 and 232 (supposed to be 180)
          For the life of me can't find a TP for VY.

            Comment

            • Alastair E
              Chief Womble
              • Mar 2013
              • 1963
              • U.K.
              #4
              Re: Insignia NS-50P650A11 Sparkles VA won't adjust

              VSC should be as written on sticker--and defo shouldn't jump around...

              -Vy test-point is often across resistor near the buffer-board connectors.
              TELEFIX

              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
              http://www.irf.com/technical-info/appnotes/an-1088.pdf
              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                Comment

                • Alastair E
                  Chief Womble
                  • Mar 2013
                  • 1963
                  • U.K.
                  #5
                  Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                  Cant see it either in yer pic--Maybe they are just using VSC as a measurement ref, then -Vy will be right too--seeing they both come from same DC-DC converter.

                  Clean and re-set that Set-VSC pot to the correct voltage.--See what happens...
                  TELEFIX

                  How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                  http://www.irf.com/technical-info/appnotes/an-1088.pdf
                  PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                    Comment

                    • SHADOW3277
                      Senior Member
                      • Jun 2014
                      • 123
                      • United States
                      #6
                      Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                      Originally posted by Alastair E
                      VSC should be as written on sticker--and defo shouldn't jump around...

                      -Vy test-point is often across resistor near the buffer-board connectors.
                      Yeah, VSC shows 180 on the sticker but it won't stay steady.

                      I still can't find VY. I went over the service manual and it lists VS, VA, VCC, VDD, and VE but no VY test point.

                        Comment

                        • SHADOW3277
                          Senior Member
                          • Jun 2014
                          • 123
                          • United States
                          #7
                          Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                          Originally posted by Alastair E
                          Cant see it either in yer pic--Maybe they are just using VSC as a measurement ref, then -Vy will be right too--seeing they both come from same DC-DC converter.

                          Clean and re-set that Set-VSC pot to the correct voltage.--See what happens...
                          Tried adjusting VSC and it still just randomly jumps around. Cant get it at 180.

                            Comment

                            • Alastair E
                              Chief Womble
                              • Mar 2013
                              • 1963
                              • U.K.
                              #8
                              Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                              Hmm--Try a new pot...?

                              --Check the diodes and caps on that DC/DC converter? Summit odd going on round there. Should set up nice and smooth/easy, with pot around its centre position, with correct VSC.

                              There's a Opto-coupler feedback loop to the controller IC that runs that DC/DC converter, try checking the voltages on/around there--poss the opto is stuffed or the controller chip Caps and diodes first I would check...

                              On one Samsung--cant remember which, There's a diode rec 1N4007 off that DC/DC converter that goes short--but that usually results in nothing at all on the screen....

                              Wrong VSC would definitely affect the operation of the panel--prob give the Mal-Discharge you have, and doesn't need to be a wildly out voltage either....
                              TELEFIX

                              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                              http://www.irf.com/technical-info/appnotes/an-1088.pdf
                              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                                Comment

                                • SHADOW3277
                                  Senior Member
                                  • Jun 2014
                                  • 123
                                  • United States
                                  #9
                                  Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                                  Originally posted by Alastair E
                                  Hmm--Try a new pot...?

                                  --Check the diodes and caps on that DC/DC converter? Summit odd going on round there. Should set up nice and smooth/easy, with pot around its centre position, with correct VSC.

                                  There's a Opto-coupler feedback loop to the controller IC that runs that DC/DC converter, try checking the voltages on/around there--poss the opto is stuffed or the controller chip Caps and diodes first I would check...

                                  On one Samsung--cant remember which, There's a diode rec 1N4007 off that DC/DC converter that goes short--but that usually results in nothing at all on the screen....

                                  Wrong VSC would definitely affect the operation of the panel--prob give the Mal-Discharge you have, and doesn't need to be a wildly out voltage either....
                                  Ok, I tested with my meter and could not find any shorts. I unhooked the YSUS and checked VA several times and it still won't go above 37 even with the Y main unhooked. I went ahead and took out the Y, X and buffer and found no shorts on those.

                                    Comment

                                    • SHADOW3277
                                      Senior Member
                                      • Jun 2014
                                      • 123
                                      • United States
                                      #10
                                      Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                                      Popped in a new power supply. All good now. Thanks for the help!

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK
                                          #11
                                          Re: Insignia NS-50P650A11 Sparkles VA won't adjust

                                          Interesting - first time I've seen a plasma with low Va. Similar maldischarge effects to Vs.
                                          BTW since this is a Samsung panel it does not have -Vy only Vsc and Vsch (which is confusingly Vsc on LG panels.)
                                          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

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