Chosen Solution
Hi, everyone. I have a macbook pro A1278 i5 2.3GHz for sometime, it won’t work on a sudden yesterday . So, I take out the logic board and have a look, it seem that one of the SMT burned,(see in the pictures , get a burn black marks.) I have no idea what is going on. If I put on the charger, the charger give a green light, no fan spin, and the burned SMT get real hot. I assume the SMT should be replaced, but do not know the specification. The words on the SMT is KO 336 16k 117, it should be the brand Kemet, I do a lot of google search, but no luck , nothing specific is found. The logic board is 820-2936-B. Does anyone have any idea? and what cause it to be like this? any fix?
Update (10/15/2021)
so after the changing smt, the mac back to life. Thank you for the information.
Sadly your CPU’s power logic is messed up. The component you’ve pointed to is a capacitor C7530 as you can see here in the board view:
And if we look for it within the schematics we can see C7530 is a 33UF 20% 16V POLY-TANT CASE: D2E-SM and is part of the PHASE-2 power section.
At this point you could have a deeper problem as well, do you have the skills to do micro-soldering? It might be best to find someone with deeper skills to fix your logic board.
