System doesn’t turn on after proper Shutdown

Hey guys,

I opened lower case A1278 and wanted to deep clean inside the keyboard because sometimes i found out my keyboard was unresponsive, especially the letter ‘A’ til ‘L’. All i did after i took my keyboard out i poured it with isopropyl 99% and brushed it with new toothbrushes. I let it dry for like a day and i was using a hairdryer as well to make sure all dry. I put all back, turn on in normal way (pressing power button &charger wasn’t connected) the keyboard working just fine.

Problem :

After that, I shutdown the system in normal way, but i can’t turn back on. Looking some information from internet.

SMC reset - not working (the magsafe lamp indicator dosnt change)

Bought new Battery - not working (same problem occurred)

Take off RAM and put it back - still no

Cleaning all part the Logic board with isopropyl 99% and toothbrush - not working (still can not turn on in normal way)

All i need to do to turn on the system is :

open lower case, unplug the battery cord, wait 3 seconds, replug the battery cord, close the lower case, press and hold power button for 10 seconds, keep holding power button and connecting with charger, release when the system is turn on.

Or

Open lower case, unplug the battery cord, open the lid, connect charger, and the system is turn on, connect the battery, when its charging, close the lower case.

If i restart it works just fine, with battery or on charging, but when i shutdown i need to do all step above.

want to try starting with power pads, but i dont know how to do it.

Where is the problem ? What is broken ?