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On u7501 Pin number 4 P5Vs3_Enable missing, I tried to trace back where it creates, found it on on page 64 after R8179, that resistor is fine , missing PM_SLP_S4_L now I am stuck here to look further
Please adviced, I attached pictures where it was liquid damage
Already changed u1900 but no difference
omg never seen anything like this
If battery is connected macbook turns on and works fine
I plug charger while battery connected works fine, disconnect battery while it is running still works well, restart computer without battery , it will restart fine , it just not turn on without battery, after turns on i can disconnect battery no issues
Disregard anything I said before. Does the Mac charge the battery? If so, then make sure you are using a known GOOD 60 or 85 watt OEM magsafe 2 charger. The 2015 Macs I have found are very finicky depending on the charger you use. Sorry for any confusion from before your post on the battery confused me when I first read it.