MacBook Air turns on without battery connected, no green or orange light comes on, I connect the battery and it shows battery with lightning and it restarts constantly.
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No magsafe light is usually linked to the 3v42 power rail and the 1-wire communication with the audio board that hosts the magsafe connector.
Be sure that your magsafe adapter is the original OEM model for this laptop. You can test (from the shared flowchart) the voltage to ground of the signal PM_BATLOW_L. This signal must be a logic '1' which confirms the logic board is happy with the power adapter. If this signal is LOW (0 volts), then the adapter is not suitable to power this board.
Use IPA alcohol & Q-tip to clean the mating contacts on the logic board. They may be coated with crud. Then test again.
What is the voltage to ground on the battery connector (with the power adapter - the battery can be disconnected) for the following?
SMBUS_SMC_5_G3_SCL
SMBUS_SMC_5_G3_SDA
Each should be ~3v42. Post your measurements.Comment
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Excellent! Well done.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 -
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... -
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... -
MacBook Pro 14" M1 Pro Turns on functions then turns off when I plug in USB C cable to reset the computer. I disconnect the battery fully and then reconnect it and it won't turn back on. After letting it sit for a day I plug the battery back up, and the MagSafe 3 cable and it powers on and stays ons, once I plug in a USB C cable into the port closes to the MagSafe port it turns off and the Amber light turns off and won't turn on. No water damage, nothing, I want to do a DFU restore to wipe the computer since the customer stated they did an update and ever since it just decided to not work...
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Hello there. I've got an issue with my Macbook Pro A1425 820-3462 with no green/orange light when plug in. Also I was unable to boot with the battery plugged in. When I change the DC-in board to another spare one I had, it show orange light and boot up with fan spinning, without the battery plug in. But it will randomly just not showing the magsafe light and the system become slow and the fans just when erratic all of sudden
Here's the voltage I've measured based on the guide I've read :
Original DC-in board (no green/orange light, no fan spin) :
SYS_ONEWIRE...
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