Current Sensing Circuitry and Its Role in MacBook Diagnosis and Repairs

What is Current Sensing Circuitry? –  Important when repairing macbooks in Sydney

Current sensing is a fundamental task in any electrical sector where all current data is required for purposes of monitoring and control. This information is then transmitted and displayed in a way that the user can understand.

Think of the battery in your phone or MacBook computer; when it shows you how much power is left, don’t you also want to know how long it’s going to last? When you boot your computer that is at, let’s say full charge, the battery communicates with the SMC and tells it that power is at 100%. It goes a step further to calculate how many hours of run time you have left if you operate at current capacity.

For example, when a Mac is at 100% and displays about 6 hours left. However, if you open up network connections, stream a movie and watch it at full volume, this figure will be significantly sliced to around an hour. But the MacBook is still at full charge, so why does the estimated run time fluctuate?

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The Importance of Current Sensing Circuitry in MacBook Repairs

This is where currency sensing circuitry comes in to perform a myriad of critical functions in your system. Depending on how many programs you run or how much ram they gulp up, the SMC calculates things like how long it will take to charge or drain the battery and if the computer is using too much charge in a short period. This is done by checking the amperage going through the current sensing resistors.

When it comes to MacBook charging issues in Sydney

some of them are frequently caused by a faulty or malfunctioning current sensing resistor. The most common, telltale signs that your current sensing circuitry is fried includes things like:

  • -MacBook only charges when laptop is off
    -Mac displays only a few minutes lefts even when fully charged
    -Computer won’t turn on from the battery
    -SMC displays impossible charging times left i.e. 90 hours left
    -Complete failure of charging safety system i.e. short circuits
    -MacBook not turning on at all

Typically, current sensing problems manifest as a result of using less power to charge the battery that is required to both charge the battery and power the system. This is why most MacBooks with the problem only charge when asleep or off. If you try to turn in on, the charge gets depleted even when the charger is on.

Ignoring malfunctioning current sensing circuitry can be very dangerous for both the computer and the user because there is no other way to turn off the charging circuit in the event of over excessive amperage. Nobody wants to watch their favorite Mac go up in flames. If your MacBook or any other laptop computer displays any of the above symptoms, make sure you take it to a certified computer repair centre sydney