demik
Well-known member
Hello,
Introduction :
This is a quick guide on how I upgraded the PSU on my Performa 6200. This guide applies to all macs which share the same case (Quadra/LC/Performa 630, Performa/PowerMac 62XX/63XX)
PowerSupplys inside this case are an afterthought. They are badly designed and the first cause of dead of Quadra 630 / Performa 6200 and friends. The case cooling doesn't help, but this PSU model is especially bad. About 80% of causes on this models are a blown PSU. You can't even put any PSU that fits, because the PSU is also used as a guide for the logic board.
If it makes this sound : View attachment sound.m4a, It's about to blow up, mine died a few minutes after this (with a spectacular bang, as expected)
The caps evaporated/overheated into the case, which can result in stuff like this :
There is also overheating marks around some parts :
Note : the diagram pictures comes from the following thread, thanks to @Floofies for his work.
Hardware needed
- 74HC04 in DIP Format
- DIP14 socket
- 10kΩ resistor
- 7kΩ resistor
- Heat shrink tubbing
- SFX Power Supply (NOT SFX-L those won't fit, just standard SFX)
Tools needed
- Set of screwdrivers
- Drill
- Metal Saw
The PSU I choose for this project was the Enermax Revolution SFX 550W (ERV550SWT) for the following reasons:
- It's decent quality enough, don't want to kill a collectible Mac with a cheap PSU
- It's passive until 165W (usefully in this case)
- I had it lying around
- It has a multitude of protections most of which the original PSU doesn't have :
You can choose any SFX PSU you like, but I recommend at least over temperature protection in this case, and it has to provide at least :
- 80mA on +5VFSB (Standby Power)
- 8A on +5V
- 3A on +12V
- 200mA on -12V
Process :
First you need to open the patient, remove the Logic Board and unplug the following wires from the PSU :
- Fan power (two wires, red and black)
- 6 Pins small grey cable near the Fan connector (used to boot the system + power the keyboard)
- PSU Connector (the big square one with blue/black/red wires)
Now you can usually remove the old PSU. Here it is against the SFX PSU
You need three components from the old PSU :
- Logic board connector
- Fan connector
- Power Loom (cut as close as possible from the old PCB)
- Power Socket (same, cute as close as possible)
Remove the new PSU from its case :
Cut the bottom of the case to it can fit inside the old PSU. You only need the plate on which the PCB is fixed. Secure it into the old PSU case. You need to drill a hole to reuse one or more of the old screws and use the rail which was previously used by the old PCB.
If your PSU has a power distribution board (like mine), remove it (cut the wires as close as possible from the PCB). I wanted to use it first, but it's really difficult inside this case.
Now the straightforward (and time consuming part):
- Weld the old power loom to the new PSU
- Remove unused power wires from the new PSU
- Weld the old power socket to the new PSU
The tricky part:
Build a boot signal concerter to convert the Mac Power Signal to the ATX one
You can use a PCB or make it redneck style. Please insulate the components with everything you can : electric tape, glue, heat shrink tubing, concrete, whatever.
I admit not being proud of this part
Secure everything and put back the old PSU cover plate :
Back in the case
And voilà ! Booted first try
Hope this will be useful for somebody. Took me 4-5 hours to to the whole thing
Good hacking !
Introduction :
This is a quick guide on how I upgraded the PSU on my Performa 6200. This guide applies to all macs which share the same case (Quadra/LC/Performa 630, Performa/PowerMac 62XX/63XX)
PowerSupplys inside this case are an afterthought. They are badly designed and the first cause of dead of Quadra 630 / Performa 6200 and friends. The case cooling doesn't help, but this PSU model is especially bad. About 80% of causes on this models are a blown PSU. You can't even put any PSU that fits, because the PSU is also used as a guide for the logic board.
If it makes this sound : View attachment sound.m4a, It's about to blow up, mine died a few minutes after this (with a spectacular bang, as expected)
The caps evaporated/overheated into the case, which can result in stuff like this :
There is also overheating marks around some parts :
Note : the diagram pictures comes from the following thread, thanks to @Floofies for his work.
Hardware needed
- 74HC04 in DIP Format
- DIP14 socket
- 10kΩ resistor
- 7kΩ resistor
- Heat shrink tubbing
- SFX Power Supply (NOT SFX-L those won't fit, just standard SFX)
Tools needed
- Set of screwdrivers
- Drill
- Metal Saw
The PSU I choose for this project was the Enermax Revolution SFX 550W (ERV550SWT) for the following reasons:
- It's decent quality enough, don't want to kill a collectible Mac with a cheap PSU
- It's passive until 165W (usefully in this case)
- I had it lying around
- It has a multitude of protections most of which the original PSU doesn't have :
- short circuit protection
- over voltage protection
- under voltage protection (brownout)
- over current protection
- over temperature protection (yep !)
- over power protection
- surges and inrush current protection.
You can choose any SFX PSU you like, but I recommend at least over temperature protection in this case, and it has to provide at least :
- 80mA on +5VFSB (Standby Power)
- 8A on +5V
- 3A on +12V
- 200mA on -12V
Process :
First you need to open the patient, remove the Logic Board and unplug the following wires from the PSU :
- Fan power (two wires, red and black)
- 6 Pins small grey cable near the Fan connector (used to boot the system + power the keyboard)
- PSU Connector (the big square one with blue/black/red wires)
Now you can usually remove the old PSU. Here it is against the SFX PSU
You need three components from the old PSU :
- Logic board connector
- Fan connector
- Power Loom (cut as close as possible from the old PCB)
- Power Socket (same, cute as close as possible)
Remove the new PSU from its case :
Cut the bottom of the case to it can fit inside the old PSU. You only need the plate on which the PCB is fixed. Secure it into the old PSU case. You need to drill a hole to reuse one or more of the old screws and use the rail which was previously used by the old PCB.
If your PSU has a power distribution board (like mine), remove it (cut the wires as close as possible from the PCB). I wanted to use it first, but it's really difficult inside this case.
Now the straightforward (and time consuming part):
- Weld the old power loom to the new PSU
- Remove unused power wires from the new PSU
- Weld the old power socket to the new PSU
The tricky part:
Build a boot signal concerter to convert the Mac Power Signal to the ATX one
You can use a PCB or make it redneck style. Please insulate the components with everything you can : electric tape, glue, heat shrink tubing, concrete, whatever.
I admit not being proud of this part
Secure everything and put back the old PSU cover plate :
Back in the case
And voilà ! Booted first try
Hope this will be useful for somebody. Took me 4-5 hours to to the whole thing
Good hacking !
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