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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-20-2011, 09:52 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

Nice pin graphic Toast.

I've worked the pins twice now, each time with a tiny jewelers straight slot screwdriver. I think I have them as good as they are gonna get.

I'm 'pressure testing' the computer as I type this. I was told a computer vs computer chess game x10 will ask everything possible of a processor. It's in it's third match and the processor temp is steady at ~60º so it's doing great!!!

It's appearing this computer is up for another round of work (or play) . I've had it since...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-19-2011, 09:22 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

It's always a matter of them saving a few cents here and a few there - such as it is today with everything today

I reworked the pins and threw in the twist. Started it up with the case open. Once it was booted I closed the case. Hurray!!! it's still running.

Because of Toasty's efforts and the rest of you at Badcaps I have my computer back. Of course I had a cooling issue to iron out, but fixing a stopped fan and some new thermal paste on the cpu chips - this computer has never been this cool and quiet.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-19-2011, 08:44 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Yeah - pushing the wires in tighter helps, but only momentarily. Slightest movement and they 'wiggle'. I may work the connector ends again. If I could torque them a little to the side so one side bypasses the other would help. Prying till they meet is marginal but better. Haven't tried your twist idea yet.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-19-2011, 08:27 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

I like the 'rotate idea. I used a small jewelers screwdriver that fit and pried the connectors tighter. They are like a small square tube that is split. I noticed on a few of them they had spread quite a bit. The prying idea helped but don't think I can get it back like new. Now if I can throw a twist in it - the torque may add the part I can't get.

I was at a point I could not close the case and then start the computer. Could only start it opened and then only after manipulating the wire bundle. Once started I couldn't close...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-19-2011, 07:09 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

I believe you hit it Toast. I've solved the over heating problem. Had a non-functioning fan and put new thermal paste on the cpu chips. The unexpected shut downs however are still an issue. I'm 98% certain the problem is in the PSU connector at the mobo.

I've visually inspected and probed the pins in the connector from the PSU and they [B]'appear'[/B] fine. Some vertical movement but only slight till each hits a stop. The mobo side is rock solid pins and receptacle.

After starting it up, I used...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-18-2011, 08:05 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Ok, thanks (some more) - I'll check those connections, fairly certain things are tight but you never know. There does seem to be something else at play but I don't know enough to figure it out myself. I'll copy and paste some more detail from an Apple Discussion thread ....

[URL="https://discussions.apple.com/thread/3002778?start=15&tstart=0"]https://discussions.apple.com/thread/3002778?start=15&tstart=0[/URL]

[I]Guess I'm not done with this thread. In the mean time here, the PSU failed and...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

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05-18-2011, 04:43 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Victory!!!

The PSU is doing it's job .... starting/running the computer. 97 posts later and an end run. Your generosity Toast is hard to quantify. Thank you.

I had a 'heart stopper' though. Had it fired up, connected to the Internet, watching the Temp Monitor, listening - all seemed toooo good. Of course it wasn't under any load but still considering these famously noisy MDDs this one is ultra quiet now. So quiet I had to pop the case open to make sure the fans were running. Had the case door about half opened...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-10-2011, 03:30 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

PM'ing

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-10-2011, 09:03 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

Hey Toast - first want to thank you for all the effort you have put in to helping me try to repair my PSU. I know my 'novice' abilities have been a challenge for you.

Have we run out of ideas or perhaps come to a point where my ability isn't enough to proceed? It isn't a [B][I]must[/I][/B] that this gets repaired. It certainly has been an interesting exercise for me so thanks for that too. There's some nostalgia with this 'old' computer and had hoped to keep it going. I know there are other avenues to do that although at this...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-06-2011, 04:32 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Yes, the diode packs were soldered back (post 83).

Jumpered green to ground on plug, and used the resistors from M8 to ground on plug (post 60)

Orange 3.33
Red 4.14
Yellow 8.96

This is from on the board where the harness comes 'from'.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-06-2011, 02:43 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Plugged in for all 3 tests - all 3 tests = 387

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-06-2011, 02:35 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Ok - my question at this point - do I keep it powered on (plugged in) while I do steps 2 and 3? Thinking now I am supposed to

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-06-2011, 01:53 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Well, I said I understood and now am not so sure.

1. 'Just' Plugged in = 387
2. (no power) Jumpered Only = started around 300+ then kept trickling down
3. (no power) Jumped and ByPassed = same as 2 but started at around 200 then trickled.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-06-2011, 10:47 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

I understand except for this - [I][B]the bypass on the opto[/B][/I] - is that the wire I soldered to the M8 pin and then to ground on the mobo plug?Re: Suspect Bad PS Apple AcBel API 1PC36

I understand except for this - [I][B]the bypass on the opto[/B][/I] - is that the wire I soldered to the M8 pin and then to ground on the mobo plug?Re: Suspect Bad PS Apple AcBel API 1PC36

I understand except for this - [I][B]the bypass on the opto[/B][/I] - is that the wire I soldered to the M8 pin...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-04-2011, 10:17 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

Think I got it ....

[B]2[/B] [B]&[/B] [COLOR="Red"][B]3[/B][/COLOR] = 244
[B]2[/B] [B]&[/B] [COLOR="Red"][B]1[/B][/COLOR] = 246
[B]5[/B] [B]&[/B] [COLOR="Red"][B]6[/B][/COLOR] = 242
[B]5[/B] [B]&[/B] [COLOR="Red"][B]4[/B][/COLOR] = 240

Reversed were all infinite.Re: Suspect Bad PS Apple AcBel API 1PC36

Think I got it ....

[B]2[/B] [B]&[/B] [COLOR="Red"][B]3[/B][/COLOR] = 244
[B]2[/B]

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-03-2011, 05:26 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Ok - think I can decipher this .... you don't assume too much .... I just don't know enough. I'll try and get this tonight, hopefully post before calling it a day.

Regarding the 'zero' readings ... the 4 pins are loose, they wiggle easily. It seems there is tension on the leads springing them to the edge. So when I take the readings I try and center the lead, pushing it slightly to center it in the hole.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-03-2011, 04:33 PM
Re: Suspect Bad PS Apple AcBel API 1PC36

Took me a bit to figure out the testing but think I got it. The picture shows the 12vShottky and hoping my diagraming isn't too hard to follow.

I number the connections 1, 2, 3 across the 'top' and 4, 5, 6 across the 'bottom' as viewed from the pictures

Tested 1 to 2 and 4 to 5, both read 159

Tested 1 to 3 and 4 to 6, both read 0...

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

05-03-2011, 08:23 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

Yes - got the wick, .10" blue label. Ready when you are.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

04-29-2011, 11:21 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

Ok - sorry - had no idea it was a problem and understand.

I retested at the board and received the same results - no decimals but there is a zero in front of the 23 so - 023.

My novice is showing.

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buz replied to Suspect Bad PS Apple AcBel API 1PC36

in Troubleshooting Power Supplies and Power Supply Design

04-29-2011, 09:08 AM
Re: Suspect Bad PS Apple AcBel API 1PC36

Black to pin 12
Red to Pins 10 / 21 / 22 / 24
Reading = 189
Reversed = 155

Black to Pin 12
Red to Pins 3 / 4 / 15
Reading = 23
Reversed = 23

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