If you receive a single beep, you have a logic board issue and youll want to call AppleCare (free for the holiday season) or head into an Apple Store if one is nearby.

I tried also turn on laptop on SMC bypass and all missing rails have a right voltage only PPVCORE_S0_AXG2_L & PPVCORE_S0_AXG1_L are not present.Īny ideas ? Is any chance that something else could cause this issue. If the logic board is working properly, you should receive the standard 3 beeps, which indicate ram is not passing the integrity check. If you need help interpreting it, please write back. A Safari page containing instructions specific for your model Mac will load.

Memory Upgrade Instructions appears at the lower right. I work with a MacBook Pro (13-inch, mid 2012) and El Capitan running. I have thinking maybe CPU is not connected properly but I bit worried with next soldering attempt it will die as to many times heated up. To upgrade RAM, click the (Apple menu) > About This Mac, then click the Memory tab. LANDAU has been reset, and all the RAM have been pre-installed. There was no liquid damage on board with 3 beeps. Got it with 3 beeps issue have tired reflow ram replace PCH no luck I decide to replace CPU because it was getting crazy warm.Īfter replacement (I remove same CPU from Donner board) with was liquid damage but I was getting a display but it was too badly corroded to fix and many things doesn't work properly.Īfter CPU swap laptop is turning on with no beeps but there is no display no chime fan is spinning I measure board and no power on a main rails. I have this MacBook Pro for repair board 820-3332-A

Macbook pro 3 beeps reseat ram