low voltage to USB ports

Recently I started noticing that some of my usb ports has failed when I tried to use them.  I had a player USB port voltage and amp to check them out and discovered that they all were between 4, 7 4.5 volts.  So I was wondering if it is a question of power supply or something else.

Just as a thought after that I checked the charge rate of my IPhone and there montre.7 Amps of charge.

The meter is accurate?

The USB 2 specification is no more than 5.25 V and no less than 4.75 V (5 V ± 5%) between positive and negative bus power lines (VBUS voltage).

From:

https://en.Wikipedia.org/wiki/USB

Since 5 volts DC is part of the supply voltage, I suspect a problem with the power supply provided that the meter is accurate.

Tags: Mac

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