RRF vs PanelDue compatibility?

tgarr

Already tried a second cable, anything else to try on the power front besides a third cable?

tgarr

Onto the third cable, better, but similar behavior. I'm beginning to suspect something is loose on the board. I have trouble believing that three cables that all show continuity on a multimeter are all bad.

Here's a criminally rotated video...(sorry)

https://photos.app.goo.gl/ZnUCBZ7fY1Y6Brn8A
(just to clarify, that flickering is accurate, not a recording artifact)

The paneldue is elevated on a plastic box just to rule out any case issues. The cables aren't touching anything.

dc42

Can you measure the power voltage at the 4-pin connector of the PanelDue?

tgarr

Looks like 4.98V

dc42

@tgarr said in RRF vs PanelDue compatibility?:

Looks like 4.98V

That's a good voltage, unless it's an average and the voltage is suffering sharp dips every time the backlight inverter starts up.

The +5V goes through a diode and an inductor before it reaches the common 5V rail. I guess one of those components might not be soldered down properly.

tgarr

Ok, I guess I'll try to return it.

The only other clue I can offer is that if I just plug in the 4 wire I get a white screen, if I power on and then plug in the ribbon cable I can reliably get the flickering.

dc42

@tgarr said in RRF vs PanelDue compatibility?:

Ok, I guess I'll try to return it.

The only other clue I can offer is that if I just plug in the 4 wire I get a white screen, if I power on and then plug in the ribbon cable I can reliably get the flickering.

Please check that there isn't a solder bridge between pins of the ribbon cable connector on the PanelDue.

tgarr

@dc42

I don't see any bridging of solder:
https://photos.app.goo.gl/MZLUyikwGnUVn5YLA

Here's the front and back for a complete picture
https://photos.app.goo.gl/Fq9kcYabgkgEwRNK6
https://photos.app.goo.gl/9BWQ1A1AZsUb39fN6

tgarr

Is there anything else I can do short of trying to get a return or exchange? This thing is effectively brand new (it did sit in the box for a month before I got around to trying it).

Phaedrux

When and where was it purchased?

tgarr

@Phaedrux

I had to look it up, Covid time flies, I guess it was more like 2 months sitting in the box.

July 30th through Printed Solid.

Phaedrux

Please contact your reseller and request a warranty exchange. Include a link to this thread as authorization.

tgarr

@Phaedrux Thanks.

Is there anything else I should / could try to make sure it's not the duet2 board first?

Phaedrux

Not that I can think of that hasn't already been tried. Unless @dc42 has any other suggestions.

dc42

If the voltage at the PanelDue power input pins on the 4-way connector is a steady 4.98V even when the display is flashing white then the fault lies in the PanelDue.

My guess is a badly-soldered diode DA2 or inductor LA1 (or just possibly LA1 is the wrong component). If you wish, you could check that by measuring the voltage between each end of LA1 and ground. Both places should be steady at about 4.5V.

tgarr

@dc42 Before I do anything stupid...(I'm a mechanical engineer not a sparky), which side of those components should I check on?

I'd assume the side opposite of the 4 wire connector, is that correct?

dc42

As you are not sure, I suggest you just ask for a warranty exchange.

tgarr

@dc42 FYI the new PanelDue got here today, I plugged it in and it worked, so good call there. Thanks.