JS123

Hi, I've bought an Eclypse Z7 and I've been working on it for some time now. Yesterday I plugged a micro-USB into the micro-AB-USB (OTG port), and the board's LEDs imediately dimed-off, and the board doesn't boot anymore in any boot configuration mode. It seems to be dead. The USB cable I plugged to the board was not connected to anything else; The board was in JTAG boot mode and operating normally. Since I'm working remotely, is there any test that I could do to diagnose it without lab equipment? Which diagnostic procedure should I follow otherwise? Kind regards,