- #Best replacement battery for macbook pro a1278 how to
- #Best replacement battery for macbook pro a1278 professional
Voltages are normal, then we need to use oscilloscope to measure it, EC and communication of the batter are normal. The voltage of the SMBUS_SMC_BSA_SDA address signal is 3.3V, which is normal. Measure SMBUS_SMC_BSA_SCL clock, the voltage is 3.3V, which is normal.
They communicate with U4900 EC, we can use UNI-T UPO8102S Oscilloscope to measure the waveform, first we can use digital multimeter to measure the voltage. Log in ZXW online account to check MacBook schematic diagram and bitmap.įind the relevant circuit of the charging circuit and find the battery interface on the bitmap.įrom the bitmap, we can see that the battery interface is J6950, open the MacBook battery interface circuit on the schematic diagram.Ĭheck the pins of the battery interface, 1 2 3 10 11 12 13 Pin all is grounding Pin, 4 Pin and 6 Pin are clock and address bus, 5 Pin is connect to the ground via resistor R6950, 7 8 9 are main power supply PPVBAT_G3H_CONN, the MacBook recharges and discharges through these Pins.įor this MacBook failure, it can be discharged, but can't recharge, which means the discharge circuit of the motherboard is fine, so first we can measure the battery interface 2 important signal 4 Pin and 5 6 Pin system management bus. After checking, we don't see any obvious failure. After replacement, the MacBook Pro can be turned on, but the power light keeps green all the time and won't charge, which means it's not caused by the damaged battery.ĭisassemble the MacBook Pro again remove the MacBook motherboard to check if it has water marks or obvious traces of damage.
#Best replacement battery for macbook pro a1278 how to
After connecting the MacBook to the power supply, the power light is green, but the MacBook battery is not charging, how to fix it?Īccording to our experience, for the battery charge failure, first we should consider whether it was caused by battery damage，so we try to fix this battery charge problem by replacing the new MacBook battery.ĭisassemble the MacBook Pro with screwdrivers, open the rear case, disconnect the MacBook battery and remove it, then install a new MacBook battery. This MacBook Pro model is A1278, the motherboard model is 820-2936-B. This MacBook Pro has battery charge failure, the MacBook battery won't charge. These high functioning batteries are designed to power the devices for a long time.How to fix MacBook Pro battery charge failure? (A1278) With the options here, you will be able to quickly find the battery you need for your customers digital devices. These calipers used for accurate measurement by builders and in factories need high quality batteries to function and has you covered with a large selection.
#Best replacement battery for macbook pro a1278 professional
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