On each try take a look at the system configuration and see if it is reading correctly. Try it in one slot and then the other slot. To test use just one stick of RAM and remove the other. However, recently I have seen three 2011-2012 machines where it is not and is the logic board. 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. The three beeps has historically been a RAM issue. 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. 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. 3 successive tones followed by a 5-second pause.I have this MacBook Pro for repair board 820-3332-A Either your computer's memory was removed or something is interfering with the system checkup.
If you hear this pattern of beeping, it means that the Mac could not find any RAM installed. When you start your Mac, it will automatically run system diagnostics. A reflow (heating of the solder balls under the GPU at around 250 degrees) could fix the problem temporary but in order to have a permanent result you need to remove the GPU and replace the solder balls (reballing). I waited ten minutes and did some quick research on my ipod. I pressed the power button until it was quiet. Talk about a rude awakening! The screen was dark and did not respond to keys or mouse clicks. I keep my laptop running most of the time, and at 4 o'clock this morning it started beeping at me.
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