14.5 volt 3 Amp Apple Power Adapter Repair
Apple 45 Watt Magsafe 2 Power Adapter Repair – 14.5 Volt 3 Amp
During this Corona Lockdown period it becomes very painful if any equipment fails as you cannot get its replacement or get it repaired.
Same thing happened with one of my colleague. His Apple Magsafe 2 power adapter failed and he could not get any support from anywhere. Since he lives just in the next building and he knows that I do sometime repair work for my own personal equipment’s, he requested me to look into his power adapter.
I assured him that I will do the repair for him but it may take some time as spare parts may be the issue. After he left I took the adapter to my work bench and checked the power on adapter cable connector. The connector pinout is given above. On check I found that voltage is fluctuating between 8 to 11 Volts.
Now I was sure that problem is in the adapter only not in the cable or connector. Since I was opening Apple adapter first time, it took some time for me to understand, how to open it. After dismantling the adapter removed the shielding plate.
Checked the voltage at output point, it was fluctuating. Removed and checked the Rectifier Diode MBR 20100 and filter capacitors. All were OK. I checked all the other SMD components of output section with Multi meter and Component tester. All were fine and readings were within limit. I checked the feedback section of Primary Section by checking voltages on pin no. 3 and 4 of photocoupler EL357N. These were also fluctuating.
To further confirm whether the problem is with primary section or output section, I used supplementation method by using another 12 Volt 3 Amps adapter. I connected the primary section of the Apple adapter to the secondary section of the 12 Volt 3 Amp Adapter using the 817 C photocoupler. I also replaced the 22 mf 50 Volt capacitor.
When I checked the output voltage it was stable and 14.5 volts. I realized that the problem was with the Photo coupler EL357N. Replaced the 817C and also to be at the safe side I replaced all the electrolyte capacitor of output section.
After this I checked the output voltage it was stable 14.5 Volts. Connected back the cable and assembled back the adapter and checked the voltage at connector. It was stable and with in limit.
Mission accomplished. Thanks & Regards
The author is a Telecom engineer and electronic enthusiast with more than 35 years of experience in Telecom / Broadcasting industry. He is residing in Delhi, India.
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