17PW26-4 voltages for future reference

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK
    #1

    17PW26-4 voltages for future reference

    I had this Hitachi Vestel junk on my bench for too long, found my frankenpsu (17PW26-4 modified to work as 17PW25-4) and installed that... amazingly it worked! The Toshiba 32BV701B would work now and then, but it would intermittently fail to start from standby... this works every time and I can't find any switch-on transient on the 5V or 3.3V, like I had a problem with before... I'm guessing this main board is malleable to this modification but not all are.

    Anyway for future reference:

    ref - standby - run
    C814 - 0.01V - 15.2V
    C801 - 18.3V - 17.5V
    C892 - 11.1V - 10.5V
    C840 - 0.01V - 0.4V (filter capacitor for part of control loop)

    Output on 24V: 24.4V
    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.
    Tags: None
    • vinceroger69
      Badcaps Legend
      • Mar 2012
      • 6714
      • uk
      #2
      Re: 17PW26-4 voltages for future reference

      was it a easy mod to do? many parts required.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: 17PW26-4 voltages for future reference

          Fairly complicated, few parts but quite involved; I did it months ago and didn't keep a reference. Main thing is the 17PW25-4 has a 5V,3A output continuously available, whereas the 17PW26-4 has a 5V standby @ 100mA and 5V run @ 3A. It also has 3.3V but this is not needed. So the fix is to connect the 5V run and standby supplies together, and to give the 3.3V a little load, to help the 5V stay stable when starting.
          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

            • vinceroger69
              Badcaps Legend
              • Mar 2012
              • 6714
              • uk
              #4
              Re: 17PW26-4 voltages for future reference

              well it works and its another set completed and kept out the land fill thats all what matters.

                Comment

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