MP 1,1-5,1 Mac Pro 5,1 AHT 4MOT/1/40000003: BOOSTA-5351

[Fastsavage]

I have just purchased a Mac Pro 4,1>5,1 with 2 x X5690 plus 128Gb RAM. Clean Install of High Serria
One of the fans is running at full speed so downloaded Macs Fan Control and found the BOOSTA fan is the culprit.
I tried slowing the fan down using Macs Fan Control but it doesn't....
All the temps look OK

I've reset SMC and NVRAM
Starts running at full speed as soon as you with it on.

Ran AHT and got the error 4MOT/1/40000003: BOOSTA-5351

If the fan wasn't working I could understand there being a fault with it but given that it's running I'm not sure.....

Any ideas please?

Cheers

 

[mikas]

Maybe you should check the CPU fan connector again.
CPU fan connector

 

[Fastsavage]

Yeah thanks - all looks good and if it wasn't connected properly I think you would expect it to NOT work at all?

 

[mikas]

Yes, true, It might be the sensor too. I guess if the mac couldn't read the sensor value it would go to full blast just in case. Strange thing is it seems it can read the value though..

 

[Fastsavage]

Yes, true, It might be the sensor too. I guess if the mac couldn't read the sensor value it would go to full blast just in case. Strange thing is it seems it can read the value though..

Yip - got me stumped, I just hope someone will have an idea that will make sense of it.

Cheers

 

[Fastsavage]

I did wonder if it might be something to do with the heatsink being too loose or too tight?

 

[Macschrauber]

Do you know if the cpus were installed lidless or not?

The last time I got an already upgraded 2009 Dual board I was glad the guy who did it left the black plastic spacers in (same as I do). So I could be 100% sure the CPUs were delidded.

If you can see the lid if you inspect it from the side maybe the connector is not seated properly.

In that case I would take it apart, delidd the CPUs (or let it delid) and mount it correctly.

Lidless is the way to go imo. No hassle with spacers or russian roulette with the torque of the heat sink screws. As if they are not too loose it gets unstable if they are too tight you will damage the cpu sockets.

 

[KeesMacPro]

One of the fans is running at full speed so downloaded Macs Fan Control and found the BOOSTA fan is the culprit.
I tried slowing the fan down using Macs Fan Control but it doesn't....

The connector in the CPU heatsink is a 6-pin for both the Boost fan and the sensor.
Sensor reading is working , so that's not the culprit.
There could be a short between pin 1 and pin 3 , somewhere in the fan cable/ the fan itself.
That would explain the fan running full speed.

As suggested by @Macschrauber I would remove the heatsinks and check for delidded CPUs and double check the connectors on the heatsink.
You could measure with a multimeter if there is a short between pin 1 and pin 3 on the connector of heatsink CPU A (the one on the right side at the back).
Perhaps the cable wasn't routed correctly when the CPU upgrade was done and/or got damaged , so look for physical damage to the fan cable .

For the pinout of the connector ( post #171 IMG 3268 or post #177) :

Mac Pro (4.1/5.1) aftermarket fans WITH automatic SMC control

I have replaced intake and exhaust fans and the difference is ... audible. The pin swapping wasnt that easy but it was a success in the end. next up is the psu fan with rerouting of the cable. Then I’ll see where I stand. But I’m happy already. Thanks for your support and hard work put into this...

forums.macrumors.com

 

[Macschrauber]

If you inspect from the side you will see the lids or the black plastic spacer.

No need to remove the heatsinks just for checking if lidless or not.

Removing the heatsinks is always very delicate on a Dual 4.1, I woudnt do it without a cause.

Plus: If once removed I'd rebuilt the Northbridge rivets, so one should be prepared with parts.

 

[KeesMacPro]

Removing the heatsinks is always very delicate on a Dual 4.1, I woudnt do it without a cause.

I agree 100 % , but I dont think the Boost fan issue can be solved without removing the heatsink.

Plus: If once removed I'd rebuilt the Northbridge rivets, so one should be prepared with parts.

Good point , the NB should be rebuilt anyway, if not done previously.

 

[Fastsavage]

Do you know if the cpus were installed lidless or not?

Lidded

If you can see the lid if you inspect it from the side maybe the connector is not seated properly.

Look to be seated ok

 

[Fastsavage]

The connector in the CPU heatsink is a 6-pin for both the Boost fan and the sensor.
Sensor reading is working , so that's not the culprit.
There could be a short between pin 1 and pin 3 , somewhere in the fan cable/ the fan itself.
That would explain the fan running full speed.

As suggested by @Macschrauber I would remove the heatsinks and check for delidded CPUs and double check the connectors on the heatsink.
You could measure with a multimeter if there is a short between pin 1 and pin 3 on the connector of heatsink CPU A (the one on the right side at the back).
Perhaps the cable wasn't routed correctly when the CPU upgrade was done and/or got damaged , so look for physical damage to the fan cable .

For the pinout of the connector ( post #171 IMG 3268 or post #177) :

Mac Pro (4.1/5.1) aftermarket fans WITH automatic SMC control

I have replaced intake and exhaust fans and the difference is ... audible. The pin swapping wasnt that easy but it was a success in the end. next up is the psu fan with rerouting of the cable. Then I’ll see where I stand. But I’m happy already. Thanks for your support and hard work put into this...

forums.macrumors.com

Thanks for this. As it has a warranty I just remembered I’ll see what the vendor wants to do and point them to this thread

Cheers