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I also had this issue with my delta flex psu. When I soldered a 40x20mm PWM Noctua the psu would start for about 5 seconds then shut down. I was reading online about other flex atx psu’s and saw that some had their polarity reversed. So I went ahead and soldered the Noctuas PWM wire to the psus sense wire and soldered the Noctuas rpm speed to the psus control wire and it worked when it booted up, no shut down! I’ve been using it for about a month now with no issues and I can hear the fan speed up like it’s suppose to when stress testing.

[QUOTE="nathanramos, post: 179435, member: 7998"] I also had this issue with my delta flex psu. When I soldered a 40x20mm PWM Noctua the psu would start for about 5 seconds then shut down. I was reading online about other flex atx psu’s and saw that some had their polarity reversed. So I went ahead and soldered the Noctuas PWM wire to the psus sense wire and soldered the Noctuas rpm speed to the psus control wire and it worked when it booted up, no shut down! I’ve been using it for about a month now with no issues and I can hear the fan speed up like it’s suppose to when stress testing. [/QUOTE]

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