Is my PowerMac G4 MDD....DEAD?!

[MrCheeto]

Thanks folks for all the help!

I finally discovered it's the transformer (the big yellow laminated transformer, closer to the fuse in those pics) which means I'm kinda in for a hell of a hunt o.o

Crap, I hope we can either find an equivalent transformer or repair the one we have. It's dead-shorting.

 

[Brien]

Or buy the PSU off the buy who posted before you.

 

[MrCheeto]

LUL!

We'll see. All I need is a transformer the same size and rated to something close enough to work in it.

Let's not forget that these things are showing their age, so even if I bought other "working" ones online, they're days are numbered. By actually replacing the defective part on this board I'll likely extend the life greatly.

 

[nanofrog]

LUL!

We'll see. All I need is a transformer the same size and rated to something close enough to work in it.

Let's not forget that these things are showing their age, so even if I bought other "working" ones online, they're days are numbered. By actually replacing the defective part on this board I'll likely extend the life greatly.

Replace the transformer and all the capacitors. You should be good at that point. But if you leave the original caps, they will go on you, and sooner than later, given it's age.

As long as you can read the P/N's or values, you should be able to locate an equivalent part. Everything should be readily available.

Hope this helps.

 

[MrCheeto]

chaw bru!

I just hope I never smell the "sweet" smell of a diode cooking 0.o

 

[nanofrog]

chaw bru!

I just hope I never smell the "sweet" smell of a diode cooking 0.o

Try trannies. Very distinct odor.

The worst I ever witnessed was ASIC explode! (Apple IIe's CPU btw). What a show.

BTW, do you know where to look for the parts you need?

 

[MrCheeto]

Hm, well the transformer in the power supply went, if that's what you mean, and I smell nuzzing, NUZZING! I guess it shorted and didn't actually splode like a death star?

Well I can find a load of caps at the RadioShack, the rest I'm lost on. =\

 

[nanofrog]

Hm, well the transformer in the power supply went, if that's what you mean, and I smell nuzzing, NUZZING! I guess it shorted and didn't actually splode like a death star?

Well I can find a load of caps at the RadioShack, the rest I'm lost on. =\

Yeah, you burnt the varnish off the windings. As it's old, the odor would be non existant.

BTW, have you made sure it didn't take anything else out with it?

As for getting parts, skip Radio Crap. They carry almost nothing these days, and aren't worth it. Junk parts, if they even have it. On the caps, make sure you use temp = 105C parts (noticed that off the photos). Anything else, you'd loose capacitance at best (high temp = reduced capacitance) or it could actually go DOA on you.

You'd need to order from:
Digikey
Mouser
Allied Electronics

 

[MrCheeto]

Darn, I always forget mouser ^.^ Danke!

 

[nanofrog]

Darn, I always forget mouser ^.^ Danke!

NP.

Didn't know if you knew of any of them, but they're listed in the order of my personal preference for prototyping components. If you're interested in electronics, or better yet, taking EE or CE as a uni major, memorize these sources.

 

[Mrburns]

If you need a power supply for an MDD, I can send you one for the cost of shipping.
Saves me having to toss away a functioning PSU...

I could use that power supply if you are still willing to send it for the cost of shipping. Let me know . Thanks

 

[Elgie]

If you need a power supply for an MDD, I can send you one for the cost of shipping.
Saves me having to toss away a functioning PSU...

SilverL,

I will buy that PSU from you for a reasonable profit it you still have it and if it is functioning. Send me an email please or reply here if interested/still available. PayPal, check, whatever you prefer. My email address is, if you can't find it in my profile, no spaces or special chars: e j l o n l i n e @ y % a h o o . c o m^

Thanks,

Elgie

 

[bokap]

Power Supply

Does this sound like a bad power supply? I turn off when I go to bed, in the morning dead. I replaced the battery, reset cuda. If I unplug for about 10 minutes it will restart. I am worried that sometime it won't start so I leave on always.
Bob