HOW TO FIX iMac 27" missing ferrite bead L5500 / fan speed issue?Hi everyone, I’m new here, and I have a question for the experts of the forum. I have an iMac 27” Mid 2011 (A1312 / 3.4...
"HOW TO FIX iMac 27" missing ferrite bead L5500 / fan speed issue?"に関する回答@oldturkey03 How much of the trace should I still scrape (in length and/or depth)? Should I reach the pad that I circled in green in the picture, above the word "AMB", and start soldering from there, or am I good to go? (The red line I have drawn is just to show the length of the trace that I’ve already scraped): The closest thing to the specs of that inductor that I found online is this one..is it ok? https://www.mouser.com/ProductDetail/Mur...-Electronics/BLM15BX221SN1D?qs=sGAEpiMZZM... I’m waiting for some tools that I bought online for less than $30: two fine tips for my soldering iron, flux paste, a desoldering vacuum pump, and a multimeter. As soon as I know what inductor I should purchase I’ll get at least 10 of them (because I don’t believe in “beginner’s luck”...). I guess I’ll have to wait a couple of weeks before I can start with this repair! :(
"HOW TO FIX iMac 27" missing ferrite bead L5500 / fan speed issue?"に関する回答@oldturkey03 That’s how I scraped the trace of the missing inductor L5500. I did it for about 3-4 seconds until it became white. Now the copper is finally visible where the trace got broken. I hope I haven’t overdone it with the tiny screwdriver:
"HOW TO FIX iMac 27" missing ferrite bead L5500 / fan speed issue?"に関する回答@arbaman @mayer It’s been hard to find it, but I think this is the schematics page you were looking for. It should be the “Ambient Temp Sensor” because I read L5500, and the FERR-220-OHM which is the ferrite bead that came off of my motherboard. Hope this helps!