LG 60PS11 (plasma) no picture

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  • j_rigsby
    Member
    • Nov 2013
    • 20
    • Canada

    #21
    Re: LG 60PS11 (plasma) no picture

    Ok, just took out buffer boards instead. Was easier. Both Vsc and -Vy voltages dropped to 0.04 VDC ish.

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: LG 60PS11 (plasma) no picture

      That's with the power supply connected to the Y-sustain?
      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

      • j_rigsby
        Member
        • Nov 2013
        • 20
        • Canada

        #23
        Re: LG 60PS11 (plasma) no picture

        Yes it is. All power connected, buffer boards removed. I will leave on for ten minutes and check agin. I will also double check voltage to Y-SUS board

        Comment

        • j_rigsby
          Member
          • Nov 2013
          • 20
          • Canada

          #24
          Re: LG 60PS11 (plasma) no picture

          Checked again. 196 VDC coming in on VS, 68 on VA, nothing on test points for -Vy and Vsc.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: LG 60PS11 (plasma) no picture

            This would seem to indicate your Y-sustain is faulty, then.
            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

            • j_rigsby
              Member
              • Nov 2013
              • 20
              • Canada

              #26
              Re: LG 60PS11 (plasma) no picture

              Ok I will order one and replace it. I will keep you posted. Thanks for the help.
              For future reference, should the voltages at the test points for -Vy and Vsc be similar to VA or VS voltage? Or what is the relationship between the two?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: LG 60PS11 (plasma) no picture

                -Vy is typically in the -100V to -200V range, Vsc is typically in the (-Vy+50V) to (-Vy+150V) range. The exact values are listed on the plasma panel sticker and indicated in the service doc I linked you.
                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

                • j_rigsby
                  Member
                  • Nov 2013
                  • 20
                  • Canada

                  #28
                  Re: LG 60PS11 (plasma) no picture

                  Ok real good. Thanks again for sharing your knowledge. Much appreciated.

                  Comment

                  • Jeff Pepin
                    Senior Member
                    • Jun 2014
                    • 103
                    • CANADA

                    #29
                    Re: LG 60PS11 (plasma) no picture

                    Hi i have the exact same trouble with exact same panel . But seems like y-sus of this tv are rare now . Mine dont energize at al but have sound , y sustain humm like normal one , z- sustain humm too and i can hear the noise change if i pop up osd !
                    All voltages look good exept VSC and -VY who are both ~4/10V)

                    I have dismounted all heatsink on y sustain than checked all t0-220 with an atmega 168 based device tester ( ebay)

                    on heatsink labeled HS401
                    Heatsink contain 7 x 51n25 (51A 250v)
                    4 of them reported as NE-MOS
                    3 reported as diode (farted)
                    (Dont have any 51amps so i have replaced all 7 by 7x irf14229 (38A) so i have added 3 more on an extra heatsink

                    Heatsink HS805
                    Contain 2x RF2001 and 4X 45F122

                    All 4 45f122 reported as capacitor ( farted)
                    Replaced by 4 x 45g127

                    Heatsink HS 804
                    Contain 2xRF2001 and 4x 45F122
                    All parts on it was good

                    HS702 AND HS703
                    each contain 4X RF2001 and 2X 45f122
                    All parts on it reported good

                    The last heatsink contain 2X K3453 and reported good

                    All big surfacrmount diodes report good in diode mode DMM

                    All resistors at gate of transistors are good

                    I will update further the progress of my work

                    Comment

                    • Jeff Pepin
                      Senior Member
                      • Jun 2014
                      • 103
                      • CANADA

                      #30
                      Re: LG 60PS11 (plasma) no picture

                      there it is '' the thing''
                      Attached Files

                      Comment

                      • Jeff Pepin
                        Senior Member
                        • Jun 2014
                        • 103
                        • CANADA

                        #31
                        Re: LG 60PS11 (plasma) no picture

                        also with both y-buffer boards removed VSC and -VY voltages are ~4/10V
                        i will test most regulator on the board today and make an update

                        Comment

                        • Jeff Pepin
                          Senior Member
                          • Jun 2014
                          • 103
                          • CANADA

                          #32
                          Re: LG 60PS11 (plasma) no picture

                          what i have checked at this time in this sector

                          in red its relults with tv plugged and on

                          in yellow its reading with setup OFF and unplugged
                          Attached Files
                          Last edited by Jeff Pepin; 03-27-2017, 07:56 PM.

                          Comment

                          • Jeff Pepin
                            Senior Member
                            • Jun 2014
                            • 103
                            • CANADA

                            #33
                            Re: LG 60PS11 (plasma) no picture

                            Im not just sure if its a good idea to put my multimeter on dc and probe my IGBTs while the set running to see whish section does not work maybe i will find whos not pushing current or simply not switching on

                            Like black probe on the frame and red probe on g/d/s
                            Last edited by Jeff Pepin; 03-30-2017, 07:26 PM.

                            Comment

                            • heavymachines
                              Badcaps Legend
                              • Mar 2011
                              • 1028
                              • United States

                              #34
                              Re: LG 60PS11 (plasma) no picture

                              You can test without power. In diode mode with dmm.
                              Last edited by heavymachines; 03-30-2017, 07:46 PM.

                              Comment

                              • dick_barton
                                Badcaps Legend
                                • Aug 2015
                                • 6642
                                • Wales

                                #35
                                Re: LG 60PS11 (plasma) no picture

                                What is the part number for IC906
                                Willing to help but I'm no expert.

                                Comment

                                • Jeff Pepin
                                  Senior Member
                                  • Jun 2014
                                  • 103
                                  • CANADA

                                  #36
                                  Re: LG 60PS11 (plasma) no picture

                                  Originally posted by dick_barton
                                  What is the part number for IC906
                                  The part is labeled RSS090
                                  Attached Files
                                  Last edited by Jeff Pepin; 03-31-2017, 10:57 PM.

                                  Comment

                                  • Jeff Pepin
                                    Senior Member
                                    • Jun 2014
                                    • 103
                                    • CANADA

                                    #37
                                    Re: LG 60PS11 (plasma) no picture

                                    Oh wow a switching power mosfet , and my vsc not switching on..

                                    Comment

                                    • Jeff Pepin
                                      Senior Member
                                      • Jun 2014
                                      • 103
                                      • CANADA

                                      #38
                                      Re: LG 60PS11 (plasma) no picture

                                      Originally posted by heavymachines
                                      You can test without power. In diode mode with dmm.
                                      Yess in fact i have removed all heatsink with parts on it then tested each one , replaced 4X 45F122 blowed open and reported as a capacitor and 3x 51n25 blowed open and reported as a diode between drain/source .

                                      All transistors are actually good , there is a failed gate driver on this board and i dont know where , so if i probe source /drain in each stage of the sustain i will be able to determine wich one have no power or simply not switch on .but i fear the power in these board lol i dobt want to toutch the drain of an igbt and see a electric ball of light
                                      Last edited by Jeff Pepin; 03-31-2017, 11:13 PM.

                                      Comment

                                      • Jeff Pepin
                                        Senior Member
                                        • Jun 2014
                                        • 103
                                        • CANADA

                                        #39
                                        Re: LG 60PS11 (plasma) no picture

                                        Originally posted by dick_barton
                                        What is the part number for IC906
                                        man thanks ive just do some readings with black probe on frame , and it look like this mosfet are not switching on ,

                                        if im ok in knowledge with a working fet ,when applying 2v to the gate it will switch on and the 5.0V from the drain will pass thru the source right ?
                                        in this case the 5.0V not pass thru ,

                                        option a 1,9V is not enought

                                        option b the switch is toast
                                        Attached Files
                                        Last edited by Jeff Pepin; 04-04-2017, 12:53 PM.

                                        Comment

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