#Fix mac pro power supply how to#

Need something more than a case for your iPhone or a battery for your Apple Watch? We also carry both internal and external hard drives, rack and server storage solutions, Blu-ray/CD/DVD burners and other Mac parts. We carry a variety of products for Apple devices, including: replacement batteries, cables and adapters, video and sound equipment, docks and stands, cases and bags, input devices and cleaning supplies. 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.Need help with upgrades for your Macbook? Trying to find replacement parts for your iPhone or other Apple accessories? Macfixit Australia is here to help you!Д®stablished in 2005, Macfixit Australia is a Melborne-based company specializing in Apple accessories and Mac parts. 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.ДЇind the relevant circuit of the charging circuit and find the battery interface on the bitmap.ДЇrom the bitmap, we can see that the battery interface is J6950, open the MacBook battery interface circuit on the schematic diagram.Д¬heck 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.ДЇor 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.Дisassemble the MacBook Pro again remove the MacBook motherboard to check if it has water marks or obvious traces of damage.

#Fix mac pro power supply 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?ДЄccording to our experience, for the battery charge failure, first we should consider whether it was caused by battery damageпјЊso we try to fix this battery charge problem by replacing the new MacBook battery.Дisassemble 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)