Hi-

My VFD is no longer displaying.

The nipple is fine.

The two on board fuses are fine (have continuity).

The display cable looks fine (no frays)

Is there some more advanced diagnostics to test?

IE, VFD pin tests to see if it's getting voltage, signal, etc?

Thanks much.

Check the third on-board fuse.

Check the serial boot-log for any info.

What is the displayboard LED doing (the bright light above the knob)?

Is the player still playing music?

Is the display brightness simply turned all the way down?

Are the components on the back of the display board all still in their proper place? Especially that large black cylindrical thing whose name I don't remember that's a common failure point.

Inductor.

You should check the voltage at TP1 under this inductor.

I have the same problem on 2 units, after replacing that third on-board fuse in both units and testing both of them. Neither of the displays would turn on.

The LED is blinking/pulsing in and out with almost no pause between, and the onboard power LED is just solid red.

I haven't tried using a known good display yet, but when I get home I'm going to try to put the mk2 display board into one of these units. I'm just curious if there is anything else besides that third fuse. The top two fuses are still good, and never bad.

Ok, I just tested with a known good displayboard and still the same problem, the VFD doesn't turn on and the display LED pulses in and out. Just triple checked all three fuses, and they all are good.

Testing the fuses by measuring across the FUSE's contacts means nothing: you must probe onto the pads, or a track/pad/pin connected to the fuse end. This lets you check that the fuse is actually in circuit, rather than just checking the fuse is good.

Also, a serial log might help.