Chosen Solution
Hi all I have a quick question today I disassembled an iMac EMC2428 because it is not starting anymore and see something I think is wrong. I suspect that 2 capacitors are missing on the logic board. C5501 and the one next to it. Can someone tell me if this is normal? Please see attached picture for details.
Thanks a lot EDIT: I received new capacitor and soldered them. All is working fine now . Thanks to all CcHuMi
search for your board number somewhere on the logic board. It should read 820-xxxx. With the board number make a search on google to find the board schematic, it’s a pdf file. Once you have the schematic open the file and make a search for C5501 and C5511 (not sure of the last one). Now you’ll see the two capacitors description and if you see “NO STUFF” it’s indicate that the two components are no present. If they should be there you’ll have the capacitors values so you’ll know which capacitors you need to find to replace them.
Here’s a snapshot of the schematic
Hi Pierre, do you know if anyone has opened the device before you? if not I wouldn’t worry too much about it as i have seen many boards with pads for capacitors and resistors that simply were not used. possible a different model had a feature that utilized those spots but instead of producing two entirely different boards the simply left off the un-needed parts. it would be odd for someone to remove the caps and just leave it like that. there seem to be several spaces empty on that board for resistors and caps alike. see if you can find any info on their intended function maybe try to find the board schematic to shed some light on certain parts and their role in the overall workings of the board? I work for a small electronics repair company and while I wish it was as simple as replacing a missing part the actual solution nearly always comes from some existing pat not doing their job. follow the traces and check voltage values where you can and you will find your answers . hope this helps
