- #BEST REPLACEMENT BATTERY FOR MACBOOK PRO A1278 HOW TO#
- #BEST REPLACEMENT BATTERY FOR MACBOOK PRO A1278 PRO#
Therefore, if it is about the performance, you don’t have to worry. Those are the standard specification that a MacBook laptop battery has. Here, you will get a Li-Polymer battery that has 56 Wh capacity and 6-cell. So, from this reputation, you can expect a good product in the laptop battery for replacing your MacBook battery. This brand is quite well-known on the market as the provider of top-quality laptop and computer accessories and hardware. Next product, we have an LQM laptop battery.
#BEST REPLACEMENT BATTERY FOR MACBOOK PRO A1278 PRO#
3) LQM New Laptop Battery for Apple MacBook Pro 15” In short, this is the best choice for your laptop battery. It means you don’t need to replace it too often. However, you need to know that depending on your activity with the laptop, that can shorten its lifespan. So, you will have quite a long period to use it on your MacBook. Next we need to replace the EC IC, after replacement, supply power to it, the charge current is normal, use oscilloscope to measure the waveform of the SMB_US_SMC_BSA_SCL signal, now the waveform is normal.Similar to the first product, this battery also can last for 500 recharge cycles. Replace the charge IC ISL6259 by QUICK 861DW hot air rework station, supply power to it, but the failure is still the same. Check schematic diagram, SMBUS_SMC_BSA_SCL is connected to charge IC and EC. Then measure SMBUS_SMC_BSA_SCL clock, there is no waveform, only 3.3V voltage, while the normal state is it has waveform and voltage. Use Oscilloscope to measure SMBUS_BATT_SDA, the waveform is normal. 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. How to fix MacBook Pro battery charge failure? (A1278)
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