Mac Pro 2009 CPU Fans running at full speed

[tsialex]

I've seen somewhere, here, in the forum, that a user desoldered the SMC chip of the tray and flashed the corrupted
1.39f11 file with a working one from a working tray! But i don't remember the topic!

No, it's not possible. What's possible is to de-solder a working SMC micro-controller from one board that has another problem and transplant it to yours. That's what the guy did, not read the firmware.

To do it, you will need at least US$ 1K of repair equipment. This is a very low ball estimative since you will need a hot plate, a hot air station, a stereoscopic microscope and at least $40 of supplies, maybe more. Plus a lot of experience/training with the repair equipment to be capable of successfully do it. It's a 144-pin TQFP…

The red star is the Renesas H8S micro controller, same one is used on the tray.

Let's not forget, you will need another tray with the SMC working, for you to remove it and install on your defective tray.

An used 2009 single CPU tray is around $70 with shipping on US eBay.

 

[ammoune78]

Yes, it's possible.

To do it, you will need at least US$ 1K of repair equipment. This is a very low ball estimative since you will need a hot plate, a hot air station, a stereoscopic microscope and at least $40 of supplies, maybe more. Plus a lot of experience/training with the repair equipment to be capable of successfully do it. It's a 144-pin TQFP…

View attachment 827767
The red star is the Renesas H8S micro controller, same one is used on the tray.

Let's not forget, you will need another tray with the SMC working, for you to remove it and install on your defective tray.

An used 2009 single CPU tray is around $70 with shipping on US eBay.

There's a guy that can do chip repair. I'll see if he can, but i still need the SMC chip to copy it's binary or should i use it for mine to entirely replace mine?

 

[tsialex]

There's a guy that can do chip repair. I'll see if he can, but i still need the SMC chip to copy it's binary or should i use it for mine to entirely replace mine?

Again, Apple never released the SMC binary, update to it or source of anything.

You can't read a SMC micro-controller, it's a secure microprocessor that blocks any reads. Read the data sheet for H8S/2140B, you will understand what I'm telling you. I edited my previous answer to make this even more clear.

Your only option is finding a tray that have another problem to remove the working SMC and then replacing the defective one on your board. This will cost you multiple times the going price of an used tray on eBay. It's totally doable, but even if you have everything on hand, will not be cost effective.

Btw, we are discussing that your problem is the SMC micro-controller on the tray, but your problem could be something else on the CPU tray and you should find what is causing the trays to fail before anything.

 

[ammoune78]

Again, Apple never released the SMC binary, update to it or source of anything.

You can't read a SMC micro-controller, it's a secure microprocessor that blocks any reads. Read the data sheet for H8S/2140B, you will understand what I'm telling you. I edited my previous answer to make this even more clear.

Your only option is finding a tray that have another problem to remove the working SMC and then replacing the defective one on your board. This will cost you multiple times the going price of an used tray on eBay. It's totally doable, but even if you have everything on hand, will not be cost effective.

Btw, we are discussing that your problem is the SMC micro-controller on the tray, but your problem could be something else on the CPU tray and you should find what is causing the trays to fail before anything.

Yes of course, but it makes same problem of the previous 4.1 tray that i've replaced. The only seen difference if i'm right, is the SMC version (Processor Tray) that disappeared in About this Mac! But again the Fans are now craziest than the 4.1 problem, because here all fans are running at high speed spinning.