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Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

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    #1

    Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

    Hi,

    I'm completely newbie to this. The only related things I've done were changing
    ROM chip in a graphic card and playing with multipliers in the MDD CPU daughter
    card by following tutorials. I don't know any electronics behind it. So please bare with me.

    Symptoms

    Date & Time settings loss
    The problem started about a year or two ago with losing date & time settings when
    turning on. PMU resetting and new PRAM battery didn't help. The date would go back
    to 1970 even though the power cord is plugged into the wall socket all the time.
    Which is odd. Since normally the Mac would remember the time even being without
    PRAM battery if the power cord is still connected to a power source. The time will be
    carried on between restarts though.

    The only occasion the time will be carried on between shutting-downs is when I turn
    it off by pressing the power button for 5 secs.

    Power light
    The light will briefly come on before completely fading away. Then it will come back on
    again. Unlike the power light of a ”healthy” MDD which will fade/blink a little while
    starting up.

    The only time the light acts like normal is when it is shut down by the 5 secs power
    button pressing before turning on.

    Cold start problem
    This issue developed just a few months ago. The Mac won't turn on if the power cord
    receives no power for too long, such as by turning off UPS it's connected to overnight.
    The power light will just flash for a moment, and it would turn itself off. Now I have to
    have the UPS switched on for 10-20 mins before powering on the Mac.

    I suspect it's the power supply (API1PC36 REV-A 360W). As the C60 is bulging.

    With the list of caps from severach and buz (I can't pull them off now as the Mac is still
    being in use).
    https://www.badcaps.net/forum/showthread.php?t=13985
    https://www.badcaps.net/forum/showthread.php?t=14077

    I'm considering replacing them.

    (uF/V) (Ripple/ESR)
    C7 220/35 850/.086
    C10 2200/16 1780/.032
    C13 2700/6.3 1910/.031
    C16 2200/6.3 1310/.048
    C21 3300/10 1740/.032
    C29 2200/6.3 1310/.048
    C35 470/35 1400/.046
    C41 680/35 1910/.031
    C59 1000/10 1050/0.069
    C60 1000/10 1080/.065

    (These Ltec TK caps don't have ESR shown in datasheet)
    C8 47/25 90/?
    C30 0.47/50 7/?
    C32 47/25 90/?
    C43 100/25 120/?
    C45 10/50 45/?

    Digikey have everything but the shipping to Thailand starts at 40 USD.
    Mouser is also 40 USD minimum. Element 14 (Farnell) is lower (23 USD)
    but lacks many caps I need.

    I would like to order from badcaps. But from what I read, using caps with too low ESR
    can cause stability problem in power supply. Very absurd, I can't use caps with friendly
    shipping cost because it's too high grade.

    But perhaps there may be some caps in some sections of the PSU that can be replaced
    with very low ESR stuffs without problem? And that may leave me with just a few that
    I can get from other sources. Please point them to me.

    Here is the original plan with caps mainly from badcaps and a few other sources.

    C7 220/35 850/.086 >> Panasonic FM 1290/.038

    C8 47/25 90/? >> Rubycon ZLG 480/0.15

    C10 2200/16 1780/.032 >> Rubycon ZLG 2900/.012

    C13 2700/6.3 1910/.031 >> Samxon GD 2550/.013

    C16 2200/6.3 1310/.048 >> Nichicon HN 2280/.011

    C21 3300/10 1740/.032 >> (3300uF/16v) UCC KZE 3400/.015

    C29 2200/6.3 1310/.048 >> Nichicon HN 2280/.011

    C30 0.47/50 7/? >> Rubycon YXF 17/5.5

    C32 47/25 90/? >> Rubycon ZLG 480/0.15

    C35 470/35 1400/.046 >> Rubycon ZLK 2880/.028

    C41 680/35 1910/.031 >> Panasonic FR 2470/.018

    C43 100/25 120/? >> Rubycon ZLG 760/.065

    C45 10/50 45/? >> Panasonic FC 90-125/1.3-2.5

    C59 1000/10 1050/0.069 >> Nichicon HM 1540/.025

    C60 1000/10 1080/.065 >> Nichicon HM 1540/.025

    Please help.
    Tags: None
    #2
    Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

    Hi, I've decided to recap all of them, excluding those big 100uF/450v caps.

    During desoldering, I found a resistor covered with cracked heat shrink tube.
    When I removed the tube, the coating of the resistor chipped off with the tube.
    So I removed it from the board. It measured 19.88K. The color coding looks like 20K.
    So it's probably a 20K. The size is around 5 mm in diameter and 15 mm long.

    It was located near a transformer, in the red marking.

    Can I continue using it or should I replace it?
    From searching on Digikey, it's probably 2-3 watt.
    If I should replace it, what type is right? Metal oxide film or metal film?
    I'm eyeing on this one.
    http://www.digikey.com/product-detai...W-3BK-ND/36882
    Attached Files
    Last edited by dyenamix; 06-17-2012, 10:13 PM.

    Comment

      #3
      Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

      That resistor looks quite toasty. You can keep using it but it wouldn't be a wise idea. Either type is fine, but it should definitely be 3W.
      Originally posted by PeteS in CA
      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
      A working TV? How boring!

      Comment

        #4
        Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

        I would go with Flame proof MOX.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

          #5
          Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

          OK, will do, thanks.

          But now I'm not so sure if it's a 20K. The color code looks like Red, Black, Orange, Gold.
          But the orange isn't so bright, a bit brownish. If it's brown, the resistor is
          then a 200 ohm.

          I've attached two pictures. The first is the location where it used to be. The second is to
          compare its color (the other side surface is still intact) with other resistors. As you see,
          the one with red arrow has got bright orange. But at the same time, another one
          (yellow arrow) has got darker brown than the chipped resistor.

          Can a failing resistor increase its capacitance from 200 to 20000?
          I'm thinking I'd go with 20K. Since that is what it measured.
          Attached Files

          Comment

            #6
            Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

            I've replaced all of the 26 caps and the resistor. So eager to try running it.

            But is it normal to have continuity between red wire and black wire from
            the power supply down to molexes ?

            Red and Black = 22.5 ohms (endless beep from multimeter)
            Yellow and Black = 187 ohms (a brief beep with touched)
            Red and Yellow = 172 ohms (a brief beep when touched)

            I would ask this before plugging it into the wall in case there's something wrong
            that is preventable.

            Comment

              #7
              Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

              OK, it's normal, after comparing with another Mac.

              Plugged it in, shorted the pins 11 & 23. It turned on without using load resistor.
              May be it's like JOHNBOY's unit.
              https://www.badcaps.net/forum/showpo...6&postcount=20

              All 24 pins read correct voltages. Then I tried connecting PSU fans, they spun.

              I'm going to reassemble it into the Mac.

              Comment

                #8
                Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

                Originally posted by dyenamix View Post
                OK, it's normal, after comparing with another Mac.

                Plugged it in, shorted the pins 11 & 23. It turned on without using load resistor.
                That's because it has internal load resistors, hence why the multimeter test results.
                Originally posted by PeteS in CA
                Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                A working TV? How boring!

                Comment

                  #9
                  Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

                  I thought so. But I was not sure as I found no one mentioned the range of the
                  resistance. Total newbie, see?.

                  Comment

                    #10
                    Re: Powermac MDD 2002 PSU API1PC36 REV-A 360W Recapping

                    Hi, now I'm typing from the MDD.

                    All the bad symptoms are gone; Date & Time/clock is back to normal like when it was new.
                    Even the blinking Power Light when powered on is back to its own self.

                    BTW, apart from the bulging C60 Teapo, all the other bigger sized caps seem fine.
                    I think the problem is mainly from those smaller LTEC caps, very much like severach's problem (especially the C45):
                    https://www.badcaps.net/forum/showpo...65&postcount=3

                    I've measured them with an ESR meter (bought from a DIY guy).
                    I don't know how accurate it is, as it seems to force any value near 0.03 ohm to zero.
                    At least, I think it's useful for relative comparison. And I hope this is helpful information.

                    This is all of the 26 caps out of 29 total (I left the three big 100uF 450V Shoei's untouched).
                    Try expanding the window size if the format looks wrong.



                    C number: Manufacturer & Series / uF & v / Size / Ripple & ESR from Datasheet / Measured ESR----------Replaced with / Size / Ripple & ESR

                    C7: LTEC LZG / 220uF 35v / 8x16 / 850 0.086 / 0.10--------------------------------------------NCC KY / 8x15 / 840 0.087

                    C8: LTEC TK / 47uF 25v / 5x11 / 90 - / 1.88---------------------------------------------------Panasonic FC / 5x11 / 175 0.80

                    C10: TEAPO SC / 2200uF 16v / 10x30 / 1780 0.032 / 0.03---------------------------------------NCC LXZ / 12.5x25 / 1950 0.030

                    C13: NCC KY / 2700uF 6.3v / 10x30 / 1910 0.031 / 0.03----------------------------------------Same

                    C16: TEAPO SC / 2200uF 6.3v / 10x25 / 1310 0.048 / 0.03--------------------------------------NCC LXZ / 10x25 / 1440 0.045

                    C21: TEAPO SC / 3300uF 10v / 10x30 / 1740 0.032 / 0.03---------------------------------------NCC LXZ / 12.5x25 / 1950 0.030

                    C29: TEAPO SC / 2200uF 6.3v / 10x25 / 1310 0.048 / 0.03--------------------------------------NCC LXZ / 10x25 / 1440 0.045

                    C30: LTEC TK / 0.47uF 50v / 5x11 / 7 - / 3.33-------------------------------------------------Nichicon PW / 5x11 / 25 5

                    C32: LTEC TK / 47uF 25v / 5x11 / 90 - / 57 (!)-------------------------------------------------Panasonic FC / 5x11 / 175 0.80

                    C35: NCC LXZ / 470uF 35v / 10x20 / 1220 0.052 / 0.03-----------------------------------------Same

                    C41: LTEC LZG / 680uF 35v / 10x28 / 1920 0.030 / 0.13----------------------------------------NCC KY / 10x30 / 1910 0.031

                    C43: LTEC TK / 100uF 25v / 6.3x11 / 120 - / 5.47----------------------------------------------Panasonic FC / 6.3x11.2 / 290 0.350

                    C45: LTEC TK / 10uF 50v / 5x11 / 45 - / 122 (!!!)-----------------------------------------------Panasonic FC / 5x11 / 125 1.30

                    C53: LTEC TK / 4.7uF 50v / 5x11 / 29 - / 1.15-------------------------------------------------Panasonic FC / 5x11 / 95 1.30

                    C55: LTEC TK / 0.47uF 50v / 5x11 / 7 - / 8.38-------------------------------------------------Nichicon PW / 5x11 / 25 5

                    C56: LTEC TK / 0.47uF 50v / 5x11 / 7 - / 3.96-------------------------------------------------Nichicon PW / 5x11 / 25 5

                    C57: LTEC TK / 4.7uF 50v / 5x11 / 29 - / 1.23-------------------------------------------------Panasonic FC / 5x11 / 95 1.30

                    C59: NCC KY / 1000uF 10v / 8x20 / 1050 0.069 / 0.03------------------------------------------Same

                    C60: TEAPO SC / 1000uF 10v / 8x20 / 1080 0.065 / 4.71 (Bulged)---------------------------------NCC KY / 8x20 / 1050 0.069

                    [Daughter Board 1]

                    C20: NCC KRE? FL? / 3.3uF 50v / 4x5 / (FL) 26 11 / 22.9-----------------------------------------Panasonic KG / 4x7 / 47 10

                    [Daughter Board 2]

                    C401: LTEC TK / 47uF 25v / 5x11 / 90 - / 2.60------------------------------------------------Panasonic FC / 5x11 / 175 0.80

                    C402: LTEC TK / 0.47uF 50v / 5x11 / 7 - / 4.76------------------------------------------------Nichicon PW / 5x11 / 25 5

                    C403: LTEC TK / 10uF 50v / 5x11 / 45 - / 1.15------------------------------------------------Panasonic FC / 5x11 / 125 1.30

                    C405: LTEC TK / 10uF 50v / 5x11 / 45 - / 2.76------------------------------------------------Panasonic FC / 5x11 / 125 1.30

                    C407: LTEC TK / 10uF 50v / 5x11 / 45 - / 1.41------------------------------------------------Panasonic FC / 5x11 / 125 1.30

                    C416: TEAPO SC / 470uF 16v / 8x15 / 730 0.093 / 0.03-----------------------------------------NCC LXZ / 8x15 / 730 0.090


                    Thank you, Badcaps.

                    Comment

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