power supply

In my quest to build out OS 9 bootable powerhouse, I learned why these machines were called the wind tunnel. I wanted to make this thing quiet and looked into the ATX power supply conversions. I watched Action Retro's Ultimate PowerMac G4 (time stamped to the part where he replaces the PSU) and...

I've scoured all the usual sources online, and can't find a schematic for this A1407 (27" Thunderbolt display). it has the Lite-On power supply (not the Flex-whatever-it-was). Board PN is 614-0505 / PA-3251-31 There's no bulged caps, fuse is OK (pretty sure there's just the one?!), bridge is...

Hello all and thanks for having me! I’ve been lurking for a few weeks while I’ve been working on an iMac g4 M1 conversion mod. Big thanks to everyone who has contributed to this pool of knowledge - it is extraordinary! I hope this has not been asked before, I gave a good look but could not find...

Hey guys, I have a 2010 Mac Pro tower that runs my recording studio (2.66GHz Nehalem Quad Core). All I really use it for is Logic Pro X, and not really much else, asides from associated plugin software. A few years ago, it started randomly turning itself off. While working, it'd be just...

I recently got a 2008 Mac Pro from a friend as it was not working, and I’m trying to see if I can get it running again. Turing the machine on shows a solid light on the power button and causes the fans to spin at max, but it doesn't show a display or signs it had booted. From what I have...

Hi, I just recently got a beige G3 desktop, but the power supply seems to be dying. I heard that these support ATX PSUs but I'm still not entirely sure. I read on one site that you need to change some wires, but on another it says it'll work fine without any mods. Checking the pinouts, pin 18...

Having trouble with my Apple iMac G4 1.25 20" "FP" (USB 2.0) M9290LL/A - PowerMac6,3 - A1065 Sometimes starting, pressing the button, works sometimes not. At a certain point it was mostly not Repair service looked the iMac over and said that the Power Supply was not functioning correctly. At...

Hey, this is my first thread and I just wanted to share my observations in case anyone else experiences the same. I recently acquired/upgraded to a Mac Pro 5,1 2010 Dual socket. I immediately noticed a very high pitch noise which was extremely annoying and audible even across the room. It...

Hello all, our normally good working iMac 27” 5K from End 2015 has a defects since some weeks. The Fan turns up and the performance drops down, so it is not possible to work on the machine. I tried to install the newest macOS, restart with D = no errors. TG Pro displayed that the Sensor “Power...

Hi I have not-so-random shutdowns problem with my 2014 Retina 27" iMac. When i try to install a fresh install of Catalina from USB onto the internal Apple SSD, first stage of the install works fine then at the installation after the first reboot when the ETA bar is shown it will reach the end...

I have a Mac Pro 2013 A1481 with a suspected bad power supply, I would like to test the bus bars from the PSU to the logic board with a multimeter. Would anyone be able to provide some instructions on where to place the black (ground) probe and red probe? and what the proper voltage readings...

Hello there, I'm currently looking for a new monitor for my MBP16". While searching, I noticed that some monitors (well, one actually, the Philips 499P9H/00) have an Ethernet port on the back to connect to. So you could connect the monitor through the Thunderbolt 3 port on the back and then...

I bought a used 2010 MBP base model that had been dropped on the power cable. Paid $20 USD. After opening it up I breathed a HUGE sigh of relief that the power PCB was separate from the logic board! I'm guessing that is because that particular part must require replacement more often than the...

Two years ago I bought a customized Mac Pro 5,1 with a GTX 980 GPU and a 1TB boot drive with Raid 0 made up of four Samsung 860 EVO SSD mSATA on some PCIe card (I forget which). I’ve never opened this thing up until recently when I switched from the 6 Core to the 12 Core. The day I ordered it...

I ran a couple of VM loads yesterday, and noticed that my third party 100W power supply maxes out at 85W, draining the battery in the process. The 96W Apple power supply maxes out at 92W. I did some testing with original Apple power supply, third party power supply and various cables. I gained...

Ok so this weird thing happened to me: My Mac Mini 2012 power supply kinda exploded... I needed the Mini on another station for the day so I unplugged it and (perhaps the mistake) took a random power cable. Connected everything, power on. Switching to the keyboard... BOOM The power cable...

Hi there, I wondered if someone could help to clarify if the sounds in the following video were normal or potentially a sign of something wrong (headphones recommended): https://bit.ly/2FJLMij The PSU is making a fizzing sound up close. The fan is also emitting a low whirring sound that is...

After seeing countless posts about people’s power supplies dying I thought I might ask this question ahead of time in case my power supply ever comes to. I’m sure power supply disassembly is possible on a Mac Pro and I was thinking how hard could it be to diagnose and repair the board. I’ve...

Hi, Was just wondering since I use my iPP as my primary email client at work, is it a problem to have it plugged into power all the time when I‘m using it, so the screen can always stay on? Will this degrade battery life and it would be better to discharge and recharge it over night?

I put the computer to sleep, when I try to wake it clicking the mouse a relay clicks from the back of the computer where the power supply is, but the hard drive doesn't spin up, I put my hand on the drive. I tried booting from my backup drive with the same results. I press and hold the front...