check u1950 voltage.... can be bad u1950... check all_sys_pwrgd if stable at 3,3 volt of it do on off.
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All power good looks ok. 3.3-3.4V.
ALL_SYS_PWRGD also 3.4V when turns on.Comment
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best way is to use scope and check whole board for spme corrotion or something strange on it....Comment
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Locate the power on/off button pads on the PCB. Use a pair of tweezers to short one pair to mimic the power button on the keyboard.
Does the board turn on and remain on with this method?
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If i just short the pads on the not populated R5116 or R5115 for a sec, fans starts than stops.
If i keep the short on the mentioned pads for few sec, the logic board turns on and remains on even if i remove the short.Comment
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When it does turn on and remains on, is the boot very slow?
https://www.ifixit.com/Answers/View/...+for+long+time.Comment
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Boot time looks OK, about 1,5min.
diagnostic result.: PFM006 and PPN001
The battery is charging, fan speed is high continiusly. The OS is responsive, i am not detecting any frozing, slowing moments.
SMC reset did not helps.Comment
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i have macbook a1466 board id 820-00165 with power fan spin green to orange light not booting no image or light i tried to fix its leak chip number U1930 but sad it has been damage due of corrosion here i attach the image of board. possible there is a jumper ways for it can't find parts for it to buy.
in first image there is 0v out for lcd
https://ibb.co/5XppmpkH
in 2nd image U1930 chip is damage is there any jumper solution or parts can be compatible for it
https://ibb.co/fdJkbJs8 -
I have a 13 inch MacBook Air 2017 that does not show any life, however, there is activity from the MagSafe light going from green to orange and staying. Normally, this battery works perfectly fine and it can actually charge the battery as if I were to leave it alone it would change to just green, however, this thing does not boot up at all, I was told the computer was at 30% and then it randomly shut off.
Some voltages:
PPBUS_G3H - 8.5V
SMC_PM_G2_EN - 3.42V
PP3V3_S5 - 3.32V
PP3V42_G3H - 3.42V
PPDCIN_G3H - 15.18V
PP5V_S5 - 5.04V
PP3V3_S5_REG_R... -
Hi All,
I got macbook air 820-00165 with green light but no fan spin.
Measurements:
PPBUS_G3H = 8.14V
PP3V3_S5 = 0V
PP5V_S5 = 0V
SMC_WAKE_L = 3.12V
SMC_ONOFF_L = 3.4V
SMC_RESET_L = 3.38V
should i change the U7501 first? -
Hello again,
got an MacBook Pro from 2015, model A1502 and motherboard version 820-3476-A.
Device died over night on charger.
Currently I did the follow things:
1. Checked visuell the board, test with another MagSafe-Charger and with another DC-IN-board too
2. Measured 16,5V on PP18V5_DCIN_FUSE but 0V on ADAPTER_SENSE and 0V on PP_3V42_G3H and 0V on PPBUS_G3H but 16,5V goes to U7090
3. Because of corrosion and bad resistor values I changed these components: U7090 / C7094 / C7095 / R7095 / R7096 / L7095 / C7099 -> But further... -
Hello every one, i have bought macbook air M2 but not power on,
try shift + option + control + power -> the webcam green light is on but not thing happen.
anyone have ideas of this ?
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