Chosen Solution
Hello! I have a Macbook without led on the charger, i have changed the battery and its brand new, still nothing. The charger is giving power, tested.
So i went trough some troubleshooting and measured some voltages: U7001: Pin 5: 3.40V Pin 4: 0V Pin 3: GND working Pin 2: 0V Pin 1: 0V
U7000: Pin 5: /// Pin 4: /// Pin 3: /// Pin 2: GND working Pin 1: 0V
C7000 Giving continuity if power is conencted, no continuity if no power is connected
Is there anything else i should be looking for? Thank you for replies!
You just found the problem. If 16.5V (charger voltage) is present on the first resistor’s pin 1 and then 0V then something is not working correctly. How do those resistors look? Are they corroded/burnt/have holes in them? You can measure their resistance too R7110 is 68.1KOhm and R7111 is 21.5kOhm. UPDATE 06/03/2021 The 0Ohm reading could mean 3 things: R7111 is bad and stopped working as a voltage dividerC7111 is a faulty capacitor and pulling the rail to groundU7100 is bad and pulling it to ground. If you have the means to de-solder these components one by one to see if you get a higher resistance to ground on pin 3, do it. I attached an image of reference voltages and highlighted the possible faulty components. I would look for corrosion or damage on C7111 first.
