So I thought, if it wouldn't be possible, to connect a normal 19V 4.5A laptop PSU (which I have a few lying around for no particular purpose) with the existing charging cable, to run the mac with that. The SMDs are also stuck down with some sort of red glue (maybe epoxy) which makes it impossible to desolder even the smallest SMD component. So the charger is pretty much unrepairable, because the main driver IC is maybe a proprietary chip, with no datasheet available on the internet. I also checked the main filter cap, and the output caps - all were fine. Then I desoldered most of the main switching semiconductors, and tested them - all were fine. I located the fuses (input and output) and both were fine. It seems that Apple has a contract with 3M, because there was so much glue and tape in that charger, i haven't seen something like this before After finally getting down to the PCB, I inspected it thoroughly but found no obviously charred components. So I opened the charger carefully, which took forever. Right at this point, I was pretty sure that the charger is at fault, because with a broken cable the voltage would've been 0V. Then I measured the voltage on the magsafe jack, and wondered that it was only 0,45V. So I inspected the cable, which was fine. The charger worked since then, without any problems, until yesterday. She had the standard problem with the broken cable a half year ago, which I fixed for her with some soldering and a few layers of heatshrink- tubing. ![]() ![]() ![]() Hi! My sister has a macbook pro 17" with a magsafe 85W charger.
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