SD card not found

Phaedrux

I used hot air three times and it worked but now it's going to often to fix in own way

Can you give some more detail on what you've actually done and what you mean by that last part?

In general we discourage people attempt repairs on their own if the board is still within warranty because that will invalidate the warranty. In some cases, if the fix is minor and the user is confident in the fix, we may allow it.

Masterpc96

@phaedrux I have service of repairing pcb, I needed 3d printer in my company, I added some flux and used hot air it fixed soldering. I used hot air only on chip U1 responsible for sd card. It was minor fix, but during printing with abs where temperature is high it happens again that this chip is being desolder

infiniteloop

@masterpc96 said in SD card not found:

during printing with abs where temperature is high it happens again that this chip is being desolder

Not sure to understand: your Duet becomes so hot that it desolders U1?

Masterpc96

@infiniteloop I think so but it is some unreal but the main problem is that
I received duet I was printing it happened U1 "desolder" and sd card not working
I used some hot air and it worked brilliant but yesterday during printing it stopped

infiniteloop

@masterpc96 said in SD card not found:

I received duet I was printing it happened U1 "desolder" and sd card not working

To "desolder", there must be temperatures above 200°C - where do they come from?

Masterpc96

@infiniteloop Poland

infiniteloop

@masterpc96 said in SD card not found:

Poland

– No, I mean: were do the high temperatures come from?

Masterpc96

@infiniteloop ahh sorry I don't know because in duet website I normal cpu temp bed is on 100* but in chamber I have only 60* I have Voron 2.4

infiniteloop

@masterpc96 said in SD card not found:

normal cpu temp bed is on 100*

That's rather hot.

but in chamber I have only 60*

So you have the Duet mounted inside of your chamber? Do you actively cool the board?

jay_s_uk

@masterpc96 duet boards are typically rated for 85 degrees I believe

Masterpc96

@infiniteloop no it is under printer (outside the printer). on cpu I have about 28*C I have blower on board.

jay_s_uk

@masterpc96 what do you have using 5v plugged into the board?

infiniteloop

@masterpc96 said in SD card not found:

no it is under printer (outside the printer). on cpu I have about 28*C I have blower on board.

I'm sorry, just had a look at the doku which says:

Unfortunately the SAME54P20A chip used in the Duet 3 Mini 5+ does not have a functioning temperature sensor. In theory it does have an on-chip temperature sensor, but the errata document for the chip says it doesn't work. However, it has been enabled in RRF 3.3 as an experiment, and does appear to give useful readings on the samples tested.

So we cannot trust the MCU temps. Your 100°C reading can be far off.

For the arrangement of the blower, the same document states:

If active cooling is needed then a fan blowing across the back of the board along the line of the stepper drivers is recommended.

Aside from this, I wonder why U1 would "desolder". Have you an impression how hot this chip becomes during operation?

Masterpc96

@infiniteloop no I don't how hot it is. But blower is connected to 12V and it works all time it blows on all board

infiniteloop

@masterpc96 Then, I don't think the "desoldering" is related to insufficient cooling. Maybe you should answer @jay_s_uk's question about what 5V you have plugged into the board. Other than that, I can only imagine a defective U1 running very hot - can you touch the chip with your fingertips for a second, or is it too hot for that exercise?

droftarts

@masterpc96 Are you sure it is U1 that is the problem? U1 is the Driver 0 stepper driver, not really connected in any way to the SD card socket, and at the other end of the board. Unless it has failed, and somehow shorting internally. Do you get any warnings that the stepper driver is overheating, or any other errors?

Ian

Phaedrux

Can you post some photos of the soldering around the SD card socket and the repairs you've made?

Masterpc96

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Masterpc96

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Masterpc96