Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.I have this MacBook Pro for repair board 820-3332-A Three beeps, then nothing for five seconds, then three more beeps. If you hear this pattern, it means that your Mac’s RAM didn’t pass a system integrity check. Three long beeps, three short beeps, then three long beeps again This pattern indicates that your Mac has a problem with its firmware and it is being restored to fix it. How to fix three beeps followed by a five-second pause problem. This pattern of beeps usually indicates an issue with RAM. 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. There was no liquid damage on board with 3 beeps. 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.
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.
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