Looking for some help with a 4 lead smps fan. I can only find replacement fans with 2 - 3 leads, its a 40mm 12 volt axial fan. Having tried 2 and 3 lead fans the psu wont power up, i have a working second unit identical, and have tried 2 and 3 lead fans on that. Its the same story, until i replace either unit with the one good 4 lead fan it wont power up. So i have one unit with a good 4 lead fan that powers up fine, the second unit needs a 4 lead fan to work, but i can't find one. My question is can i trick the unit to use a 3 lead fan, is there a way to site that fourth lead to a terminal or juction to get the 3 lead fan to power the unit on. Just a bit more info, these are 1200 watt converted served psu's model. HP1200 DPS FB. Thanks for reading.
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