BOE VFD48-1202FN, Руководство по сборке

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Step 7: First Testing
After finished all the 6 steps shown up, now we can plug the VFD48
panel in the PCB(Do not solder it!) and plug the USB power in,
use hand to push the panel a little bit up to make sure all the
legs touched the pad; If all fine the clock will started displaying
and ticking, please check all the segments inside the panel to
see if can be light up correctly. If some segments do not light
up, please check if some legs of the panel did not contact the
pad correctly or tightly or some legs of the PT6315 chip did not
be soldered correctly. If the two or more segments are lighted
up together, may have the short among the PT6315 legs.
If all fine, unplug the panel we can do the next step.