I have a programmable board with 4 usb host connectors, 3 visible and 2 usb hubs/2 port each (you can enable 1&2 and/or 3&4).
1 port is not providing any energy, as far I can see, there is 1 capacitor and 2 other nearby components used in every usb port.
I wish to know if someone knows anything I can do to debug this problem or has any experience (what can be damaged?)
I discovered that the nearby usb DOES provide power but the board itself reboots if I use that port for a while for example with a usb keyboard.
The board is an eBox 3350MX:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280703095602&ssPageName=ADME:X:RTQ:US:1123
CPU: DM&P Vortex86MX (PMX-1000) @933MHz
[Processor is Pentium I MMX compatible - will run i586 instructions but not i686]
BIOS: AMI BIOS
Memory: 512 MB DDR2 RAM
[RAM is soldered on-board and cannot be replaced or upgraded]
VGA Integrated Graphics Chip: RDC Semiconductor M2010 (D-Sub 15-pin)
[64MB separate RAM for GPU]
Ethernet 10/100 Mbps LAN: RDC Semiconductor R6040 (RJ-45 connector)
[Built-in PXE diskless boot function]
USB: 3 ports (2 at the front, 1 at the rear)
[Support USB 1.1 and USB 2.0]
Audio: RDC Semiconductor R3010 High Definition Audio
[Realtek ALC262 Audio Codec - Mic in and Line out]
Storage: 1x SD Slot (Supports SDHC up to 32GB)
[SD Slot is bootable but not hot-swappable]
Dimensions: 95 x 95 x 20 mm
[Includes 4 holes for VESA 75 mounting standard to mount behind LCD monitor]
Power DC +5V @ 2A