BOE VFD48-1202FN, Руководство по сборке

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6
After this step, you can plug the 5V USB power in ,then plug the
VFD48 panel in ( Please do not solder the panel at this time ),
press the panel a little bit to make sure the pins touch the PCB
pad well, when under the black environment, you can see the
filament inside the panel will be light up in a little bit dark
red color. Or you can measure the filament pins with oscillograph,
you can see the AC output.
Step 4: Negative High Voltage part circuit
The Negative High Voltage part circuit is made by the -HV boost
DC-DC chip, it is in SOT23-5 package with LTKF/LTES/LTRA mark
on surface; Just follow the PCB diagram to solder this part of
the circuit components. Want to notice that please control the
soldering temperature and make sure the 10Uh inductor pad is be
soldered correctly.