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USB Ammeter - Taking You From Amateur To Pro
Today we will be reviewing a powerful tool that is commonly underutilized in the repair industry. The USB Ammeter is cost effective and provides quick simple troubleshooting for power related issues.
How does it work?
The Ammeter is connected to a USB block and the charging cable for your device is connected to the Ammeter. The Ammeter displays the voltage and current being supplied to the device that is connected. We recommend using an original power block and charging cable or MFI (certified) chargers for best results.
How does it identify battery, charging port, or Tri-Star (board level) chip issue?
When a device is connected to the Ammeter, certain values should be shown. If these values are not seen, the troubleshooting process is as follows: test new cable, test new charging block, test new battery, test new charging port. Should the desired results still not display, the Tri-Star IC on the logic board is most likely the cause of the charging issue. This chip is commonly damaged due to either drops of the device or use of lower quality cables and accessories connected to the charging port. The incorrect values indicate that either a part, cable, charging block, or board level component is preventing the device from charging correctly.
The chart below displays the desired values when using the Ammeter:
| Device | Battery at less than 80% (Amps) | Battery more than 80% (Amps) | Battery not connected (Amps) |
| Cell Phone | 1.0 | .4 - .5 | .08 - .2 |
| Tablet | 1.5 - 2.0 | .6 - .8 | .08 - .2 |