| Electronics > Repair |
| Can this Noctua 12v Fan be fixed? |
| << < (4/9) > >> |
| enut11:
--- Quote from: floobydust on July 30, 2024, 10:20:38 pm --- --- 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 --- End quote --- Transistor ID is RKM40 |
| floobydust:
I meant SC-59 for as a package guess, it seems smaller than SOT-23? SMT marking code "RK" is a hall sensor like AK1751 but "M" is not a valid year code. Or RK7002 but SOT-23. Just looking at other parts that might have died. |
| fzabkar:
--- Quote from: enut11 on July 31, 2024, 01:19:05 am ---Transistor ID is RKM40 --- End quote --- What is the circuit reference? Is it a Q or an IC? Does it look like this? https://ae-pic-a1.aliexpress-media.com/kf/S25333058a3724cc9823f87c4c5a7255cc/20PCS-50PCS-100PCS-1000PCS-New-original-RK7002T116-RK7002-MOSFET-N-CH-60V-250MA-SST3-silk-screen.jpg |
| enut11:
--- Quote from: fzabkar on July 31, 2024, 01:05:00 am --- --- 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. --- End quote --- @fzabkar, looks about right to me. There is 5.6R resistance between 4 (+IN) and 6,7 (Gnd). Pins 6 and 7 are connected together. I found some brushless fan internal circuits to get a feel for how they work. The two 8-pin controllers below have separate hall sensors. |
| enut11:
--- Quote from: fzabkar on July 31, 2024, 01:52:33 am --- --- Quote from: enut11 on July 31, 2024, 01:19:05 am ---Transistor ID is RKM40 --- End quote --- What is the circuit reference? Is it a Q or an IC? Does it look like this? --- End quote --- It's a Q. Similar to your URL. |
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