Hello All
I'm just starting to work on a MacBook Air 820-00165 that will not start up, I have the following measurements. Some voltages are steady while others are pulsing. There was a tiny bit of liquid spill on the board but I believe that I have cleared it up. There doesn't seem to be an obvious short on the board. The board is out and not connected to any of the normal hardware.
STEADY VOLTAGES:
PPBUS_G3H 8.59V
PPBUS_S5_HS_COMPUTING_ISNS 8.59V
PP3V3_S5 3.32V
PP3V3_SUS 3.32
PP3V42_G3H 3.41V
PPVRTC_G3H 3.32
PP5V_S5 5.03
PULSING VOLTAGES:
PP5V_S4
PP1V2_S3
PP1V05_S0
PP1V8_S3
PM_SLP_S4_L
COIL RESISTANCES
L7310 / L7320 11.5 (CPUVR)
L7630 173.2 (PP1V05)
L7430 570 (PPDDR_S3)
L7520 > 20K (PP5V_S4)
L7560 > 20K (PP3V3_S5)
L7130 > 20K (PPBUS_G3H)
L7095 > 20K (PP3V42_G3H)
Some of the liquid spill was on the PP3v3_SUS line at the EFI ROM chip. I'm not sure if I would have this issue if the ROM chip was not loading. It was more of a goo that cleaned up with water rather than corrosion and it cleaned up OK.
Compared to another board that I have the resistance measurements are quite similar. I'm curious as to whether anyone had a board with a similar issue?
I'm just starting to work on a MacBook Air 820-00165 that will not start up, I have the following measurements. Some voltages are steady while others are pulsing. There was a tiny bit of liquid spill on the board but I believe that I have cleared it up. There doesn't seem to be an obvious short on the board. The board is out and not connected to any of the normal hardware.
STEADY VOLTAGES:
PPBUS_G3H 8.59V
PPBUS_S5_HS_COMPUTING_ISNS 8.59V
PP3V3_S5 3.32V
PP3V3_SUS 3.32
PP3V42_G3H 3.41V
PPVRTC_G3H 3.32
PP5V_S5 5.03
PULSING VOLTAGES:
PP5V_S4
PP1V2_S3
PP1V05_S0
PP1V8_S3
PM_SLP_S4_L
COIL RESISTANCES
L7310 / L7320 11.5 (CPUVR)
L7630 173.2 (PP1V05)
L7430 570 (PPDDR_S3)
L7520 > 20K (PP5V_S4)
L7560 > 20K (PP3V3_S5)
L7130 > 20K (PPBUS_G3H)
L7095 > 20K (PP3V42_G3H)
Some of the liquid spill was on the PP3v3_SUS line at the EFI ROM chip. I'm not sure if I would have this issue if the ROM chip was not loading. It was more of a goo that cleaned up with water rather than corrosion and it cleaned up OK.
Compared to another board that I have the resistance measurements are quite similar. I'm curious as to whether anyone had a board with a similar issue?
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