Electronics > Repair
Can this Noctua 12v Fan be fixed?
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enut11:

--- Quote from: floobydust on July 30, 2024, 06:02:29 pm ---OP the PCB trace along the outside edge looks quite carved up, make sure it's not open circuit.
The IC looks JEITA, it's not an SO-8 with the straight leads and pics of the NE-FD1 are gull wing.
Any idea what the SC-70 part number is, what it's doing.

--- End quote ---

The outer track in OK, just my ham-fisted approach to removing the PCB assembly.

'SC-70'? not sure what you are asking
floobydust:

--- Quote from: enut11 on July 30, 2024, 09:35:10 pm ---The outer track in OK, just my ham-fisted approach to removing the PCB assembly.

'SC-70'? not sure what you are asking

--- End quote ---

see pic
thm_w:
This fan was released in 2018 or 2019, warranty 6 years, surely it was still under warranty?
fzabkar:

--- Quote from: enut11 on July 30, 2024, 09:52:46 am ---@magic, quite right, it would be relatively easy to trace out the circuit.
However, I just found out that Noctua use a proprietary chip in their fans. :(

--- End quote ---

Let me try.

I think that IC1 is a 2-phase brushless DC motor driver with on-chip Hall sensor, PWM control input and tacho output.

8/ Config / Mode #1
7/ Config / Mode #2
6/ Ground / V-
5/ V2 -- motor phase #2
4/ V0 / V+ -- positive supply to motor and PCB
3/ V1 -- motor phase #1
2/ S -- speed sensor output ??
1/ P -- PWM input ??

I suspect that R2, R3, R4 are configuration or mode select resistors or shorting links.
enut11:

--- Quote from: thm_w on July 31, 2024, 12:14:05 am ---This fan was released in 2018 or 2019, warranty 6 years, surely it was still under warranty?

--- End quote ---

I am not the original owner and do not have the receipt. Also, cost of postage from Australia could exceed its value.
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