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2012 MB Air 820-3208-A voltage fluctuations
PM_S0_PGOOD on U2750 (Pin4) & U2760 (Pin1) is steady at 1 mV- da_muffinman
- Post #8
- Forum: Macbook Logic Board Repair Questions
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2012 MB Air 820-3208-A voltage fluctuations
L7510 Pin1: 0V Pin2: 0V L7550 Pin1: flux +/- 150mV Pin2: 0V L7330 Pin1: flux 150mV - 1250mV Pin2: flux 150mV - 1250mV L7630 Pin1: flux 0V - 1000mV Pin2: flux 0V - 1000mV L7100 Pin1: flux 2mV - 1000mV Pin2: flux 2mV - 1000mV L7030 Pin1: steady 8.44V Pin2: steady 8.44V L7220 Pin1: flux 0V - 5V...- da_muffinman
- Post #7
- Forum: Macbook Logic Board Repair Questions
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2012 MB Air 820-3208-A voltage fluctuations
Thank you - due to the timing of the voltage pulses, it seems I did indeed mis-measure some points as 0V when they are in fact fluctuating. The entire ALL_SYS_PWRGD rail that I have yet measured has the same fluctuation 0V-~3V every few seconds. CPUIMVP_AXG_PGOOD is actually fluctuating...- da_muffinman
- Post #5
- Forum: Macbook Logic Board Repair Questions
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2012 MB Air 820-3208-A voltage fluctuations
My apologies. Rails with stable voltages include but are not limited to: PP5V_S5 PPBUS_G3H PP3V42_G3H CPUIMVP_AXG_PGOOD Rails with fluctuating voltage include but are not limited to: PP3V3_S0 CPUIMVP_VR_ON PP5V_S0 PP5V_S3 (ALL_SYS_PWRGD) Rails reading 0 voltage include but are not...- da_muffinman
- Post #3
- Forum: Macbook Logic Board Repair Questions
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2012 MB Air 820-3208-A voltage fluctuations
This one is stuck in the perpetual boot loop (fan spins a few seconds, shuts off, rinse & repeat). Charger light comes on / no chime / no damage I have discovered yet. I'm sorry I am a noobsicle :rolleyes: pls see attached- da_muffinman
- Thread
- Replies: 29
- Forum: Macbook Logic Board Repair Questions