Technika 22-880 startup issues

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  • notallbad
    Badcaps Legend
    • Oct 2012
    • 1183
    • UK

    #21
    Re: Technika 22-880 startup issues

    Only getting 2.38v on ICE3BR0665J VCC pin in stby and 3.2v when on, Tech Sheet says between 10.5 and 25v.

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: Technika 22-880 startup issues

      Where is your ground going?
      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

      • notallbad
        Badcaps Legend
        • Oct 2012
        • 1183
        • UK

        #23
        Re: Technika 22-880 startup issues

        Sorry, don't understand.

        Via D701 and C704 TO Chassis???
        Last edited by notallbad; 08-07-2013, 08:33 AM.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: Technika 22-880 startup issues

          The negative lead of the multimeter sorry
          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.

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          • notallbad
            Badcaps Legend
            • Oct 2012
            • 1183
            • UK

            #25
            Re: Technika 22-880 startup issues

            Oh, chassis screw.
            Now with neg probe to C706 neg leg.
            18v whilst led flashing, then 13.64v while in stby and 18.41v when on. So spotted my mistake there.
            Last edited by notallbad; 08-07-2013, 08:41 AM.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #26
              Re: Technika 22-880 startup issues

              OK you are now measuring the primary-side "ICE" relative to primary side ground?

              Blinking power LED is rarely power supply on these modern vestels. Usually it is a main board issue.

              What is main board model? 17MBxx-x?
              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.

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              • notallbad
                Badcaps Legend
                • Oct 2012
                • 1183
                • UK

                #27
                Re: Technika 22-880 startup issues

                17MB60-3.1, I was afraid of that.

                Not sure if you have read an earlier post but in the Diagnostic page of the Service Menu it shows NOK, is this Not OK as opposed to the others that just read OK? Do you happen to know?
                Last edited by notallbad; 08-07-2013, 08:51 AM.

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                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: Technika 22-880 startup issues

                  SM


                  Of interest is page 66.

                  Problem: LED blinking, no other operation
                  This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal operation. When there is a short circuit protect pin will be logic low. If you detect logic low on protect pin, unplug the TV set and control voltage points with a multimeter to find the shorted voltage to ground.


                  Locate Q178 for PROTECT indicator. Test point TP202.
                  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.

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                  • notallbad
                    Badcaps Legend
                    • Oct 2012
                    • 1183
                    • UK

                    #29
                    Re: Technika 22-880 startup issues

                    Thats gonna be on the solder side, bummer. Oh well, here we go.

                    Aha just spotted it on component side, this is getting too easy.

                    Thanks Tom.
                    Last edited by notallbad; 08-07-2013, 08:58 AM.

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                    • notallbad
                      Badcaps Legend
                      • Oct 2012
                      • 1183
                      • UK

                      #30
                      Re: Technika 22-880 startup issues

                      TP202 reads 3.3v whilst flashing led then 0v whilst in stby, then 3.3v again whilst led flashing when powering on out of stby and remains whilst on and working.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #31
                        Re: Technika 22-880 startup issues

                        OK, that may be OK then. But check all the voltages that feed in to it: 24V_VCC, 18V_VCC, 12V_VCC etc. The appropriate points are found at the diodes.
                        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

                        • notallbad
                          Badcaps Legend
                          • Oct 2012
                          • 1183
                          • UK

                          #32
                          Re: Technika 22-880 startup issues

                          Looking for the diodes you suggested.

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                          • notallbad
                            Badcaps Legend
                            • Oct 2012
                            • 1183
                            • UK

                            #33
                            Re: Technika 22-880 startup issues

                            Whilst on

                            D184 3.29V, 5V, 3V
                            D185 3.29V, 4.3V, 2.98V
                            D186 3.29V, 3.3V, 5V

                            Comment

                            • notallbad
                              Badcaps Legend
                              • Oct 2012
                              • 1183
                              • UK

                              #34
                              Re: Technika 22-880 startup issues

                              Now it appears stuck in stby, no response to remote or keypad.
                              Powered down and restarted but still no joy.
                              Shall try powering down for a while and retry.

                              Comment

                              • notallbad
                                Badcaps Legend
                                • Oct 2012
                                • 1183
                                • UK

                                #35
                                Re: Technika 22-880 startup issues

                                U180 Adj Reg is reading Pin 3 - 8v, Pins2 and 4(tab) - 5v and Pin 1 - 4v
                                Across Pins 1 and 2 reads 1.2v.

                                Is that Pin1 - 4v looking suspect?

                                Edited - Erm, no I guess not, sorry.
                                Last edited by notallbad; 08-07-2013, 11:34 AM.

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                                • notallbad
                                  Badcaps Legend
                                  • Oct 2012
                                  • 1183
                                  • UK

                                  #36
                                  Re: Technika 22-880 startup issues

                                  I think this main board is screwed, the main chip U157 is running hot within seconds of being on.

                                  The front led sometimes comes on and flickers, not the usual led flashing, and other times comes on solid. No backlight on but have good 24v and 3.1v on dim.

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                                  • notallbad
                                    Badcaps Legend
                                    • Oct 2012
                                    • 1183
                                    • UK

                                    #37
                                    Re: Technika 22-880 startup issues

                                    So just for future reference/interest
                                    These are readings whilst powered from mains but no response from remote or keypad
                                    1 3.1v---------11 5v
                                    2 3.1v---------12 5v
                                    3 3.1v---------13 5v
                                    4 11v-------14 11v
                                    5 5v-----------15 5v
                                    6 5v--------16 11v
                                    7 3.1v ----------17 0v
                                    8 0v--------18 0v
                                    9 0v-----------19 0v
                                    10 0v-------------20 0v

                                    Comment

                                    • notallbad
                                      Badcaps Legend
                                      • Oct 2012
                                      • 1183
                                      • UK

                                      #38
                                      Re: Technika 22-880 startup issues

                                      I suppose it is possible the SW is corrupt but doubt it.
                                      Also presumably as the tv does not start up properly it is not possible to update the SW via USB.

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                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: Technika 22-880 startup issues

                                        There is a method in the linked SM on how to update firmware without ever seeing the LCD light up (just need remote & USB key), but I'm not sure if it will work if in protect mode.
                                        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

                                        • notallbad
                                          Badcaps Legend
                                          • Oct 2012
                                          • 1183
                                          • UK

                                          #40
                                          Re: Technika 22-880 startup issues

                                          What the hell, shall have a go and see, its not like its gonna break it anymore than it already is, well I guess it could.

                                          Comment

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