Video - Lcd has a usb slot but it does not work

Select About This Mac About this Mac; Then select 'System Report' System Profiler will open up Select USB located under Hardware in the

As stated in Wikipedia The USB and specifications provide a 5 V supply on a single wire to power connected USB devices

usb slot USB & 3 x USB Ports POR-1484 USB Hub You can buy different types of USB ports online that vary in size, parameters, speed, and the number of slots

usb a slot slots installed If your laptop does not have an SD card reader slot, you can easily buy an inexpensive USB adapter MicroSD Card Reader