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MP 3.1 PSU Repair

yes, increase the speed of the fans and see if the machine dies again. Cleaning the area where air flows is a good idea, too.

Block fans from moving and better use air than a vacuum cleaner (those can be esd bastards due the plastic hose)
 
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Macschrauber said:
yes, increase the speed of the fans and see if the machine dies again. Cleaning the area where air flows is a good idea, too.

Block fans from moving and better use air than a vacuum cleaner (those can be esd bastards due the plastic hose)
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Thanks cranked all fans up to around 3000 rpms sounds like im in a wind tunnel or behind a running jet engine but soooo far it has dropped my temps (in a yelling hard to hear voice due to sound) hahah

7d7fda7e11df784720e37697da9d4b53.jpg
 
Might just sell this and my 20" cinemas due to taking up too much room anyways.... dont want to dump money into it any more
 
j2048b said:
Do these temps look too high? Also my memory is like 800 mghz not sure but maybe too high for a 3.1? Thought 667 was the highest it was supposed to take mghz wise?
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The 1,1 / 2,1 had 667Mhz ... the 3,1 was 800Mhz from Apple.
 
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Well... i had some time to test one of those PSU's yesterday. And it worked. I don't know why.

I received this one in July this year. I opened it to check for leaking caps. And than it rested on a shelf for the last 6 Months. Now I connected it to a MacPro (Dual X5472), GTX660, 4 Harddisks and 8 Ram modules. Did a CPU benchmark to rise the power consumption a little. That damn thing won't shut down. Now how can i Repair it when it is working?

I found some dodgy looking solder point at the coil on the Low Voltage side. I did not resoldered it yet.
 
Roman78 said:
Well... i had some time to test one of those PSU's yesterday. And it worked. I don't know why.

I received this one in July this year. I opened it to check for leaking caps. And than it rested on a shelf for the last 6 Months. Now I connected it to a MacPro (Dual X5472), GTX660, 4 Harddisks and 8 Ram modules. Did a CPU benchmark to rise the power consumption a little. That damn thing won't shut down. Now how can i Repair it when it is working?

I found some dodgy looking solder point at the coil on the Low Voltage side. I did not resoldered it yet.
Click to expand...

I took out my PSU today to have an annual check-up while putting pixlas power cable inside to power may new Vega 64, the premium card of the iMac Pro. Runs Mojave like a dream. :)

Looking inside the PSU I noticed much dust. The power transistors are screwed on Alu heatsinks with a regular screw. That means they could be replaced rather easily. Since you are in Germany and you want to get into component level repair, the company "Bürklin" should be your home Bible. A USA comparison to Bürklin would also be advisable. The OEM manufacturer of the PSU is Delta, you might want to contact the manufacturer phone/service support regarding repair parts and most of all electrical drawings.
A couple weeks ago I did replace certain relais component from my dad's home central heating unit. Tyco was very forthcoming as well as Viessmann. You wouldn't believe what is possible just asking kindly. A happy new year to you!
 
MP 3,1: The "LED 8 [Power Good]" is off, but the "LED 7 [GPU Present]" flickers rapidly (This is without the RAM risers and graphics card(s) plugged in). Is there a sure-fire way of checking the PSU is the one that is faulty, and not the logic board?

I have already carried out these troubleshooting tips from the service guide:
• Check that the power cables to the logic board are properly attached.
• Check the cable connections at the power supply.
• Check for any signs of an obvious electrical short, e.g. metal screws or PCI card slot cover loose inside computer touching the logic board.
 
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You may jump start the PSU and test the 12 Volt Rails with a high current taking load. For example a 12 V headlight car bulb.
 
Macschrauber said:
You may jump start the PSU and test the 12 Volt Rails with a high current taking load. For example a 12 V headlight car bulb.
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Thanks. That sounds like what I am after... Is the PSU jumping the same as a PC PSU? And how would I attach a headlight bulb to it?
 
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