pinout and voltage for STK5472 IC?

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  • Wizard
    Badcaps Legend
    • Mar 2008
    • 2296
    #1

    pinout and voltage for STK5472 IC?

    I have this in a hifi VCR mitsubishi HS-U82(C). Had bad caps (repaired corroded traces) and blown resistor on the power board itself. Reason I'm trying to revive it is all analog and have S-Video feature that I can output from tuner to a scaler box like DVDO Edge for best results.

    I need to know why this still responds to transport mechanism when I put tape in but no display and no video output or no video pass through.

    Thanks & cheers, Wizard
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31161
      • Albion
      #2
      Re: pinout and voltage for STK5472 IC?

      display is usually a low voltage AC supply from the transformer - buffered through an electrolytic cap that goes open.

      the loopthrough and output need power to the modulator/mixer unit - forget the stk & look at the outputs from the transformer that go towards the display.

        Comment

        • Wizard
          Badcaps Legend
          • Mar 2008
          • 2296
          #3
          Re: pinout and voltage for STK5472 IC?

          It is AC of around 3.4VAC or so on that display heater. And I'm not sure if this design uses AC or DC for heater. There are several designs that do same function that why I need more specific data.

          Please, I need info on this STK5472 and voltages as I have other problems, example I can't get any output when I play the VCR with a tape or OSD on the TV. There was other faults too that why I need more info.

          Cheers, Wizard
          Last edited by Wizard; 06-03-2010, 01:56 PM.

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: pinout and voltage for STK5472 IC?

              You mean like this?

              http://margo.student.utwente.nl/el/c...RHYBRINDPS_017

              6.11) STK5472 (ECG1883)

              Pin 1: VO3/5.3 V @ 1 A
              Pin 2: Cutoff
              Pin 3: VI2
              Pin 4: VO2/12.0 @ .8 A
              Pin 5: VO1/12.1 @ .8 A
              Pin 6: Vb
              Pin 7: VI1
              Pin 8: GND

              Originally posted by Wizard
              Please, I need info on this STK5472 and voltages
              Cheers, Wizard
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                Comment

                • Wizard
                  Badcaps Legend
                  • Mar 2008
                  • 2296
                  #5
                  Re: pinout and voltage for STK5472 IC?

                  Yes, What does Vb, VI1, VI2 are? That's why full documentation is important. I'm unable to find one in PDF datasheet. Hence request here.

                  Cheers, Wizard

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 31161
                      • Albion
                      #6
                      Re: pinout and voltage for STK5472 IC?

                      volts-in i suspect.
                      3 seperate regulators with a common control pin.

                        Comment

                        • Wizard
                          Badcaps Legend
                          • Mar 2008
                          • 2296
                          #7
                          Re: pinout and voltage for STK5472 IC?

                          Well, I determined this VCR is a total loss, the STR5472 checks out ok.

                          Cheers, Wizard

                            Comment

                            • ChaoZ
                              Member
                              • Oct 2007
                              • 37
                              #8
                              Re: pinout and voltage for STK5472 IC?

                              I repaired the psu of a dvd player before. Not as complex but there are couple of rails of power... and the logic board is picky on the voltage range.

                              the inductor shorted(yes, puny coils) and it had 5 - 8 bad caps. did the replacement and it begins to work again. i remembered the psu did some odd voltages... 14? 21?

                              hope it helps.

                                Comment

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