Trying to Fix Macbook Pro Early 2011 -A1278||820-2936 PM me!! Issue: Dead Motherboard / Intermittently Turning On Reason: missing "PM_SLP_S4_L" which is a PCH Generated Signal and missing "SYSCLK_CLK32K" signal generated which is required to power the PCH Solution: Replaced [(U2800) - System RTC Power Source & 32kHz / 25MHz Clock Generator] Thank you - Jovie Gallardo -pagawa na kayo tignan nyo namn sarili kung laptop di ko man lang maayos hahaha baka gusto nyo rin mag subscribe baka lang naman hahahaha thanks. https://www.youtube.com/watch?v=IISMIMv57_o