Design Review Request - RGB Sign

Did you mount the crystal or did PCBA fab do it? If you then measure a lone crystal for 0 ohms between pins. If the fab mounted it then check that the part you ordered is what you expected, a passive crystal, which is what the circuit wants.

As I said active crystals are a thing and have 4 pins. You feed them power and out comes a square wave. I find it odd that you used a 4 terminal crystal with shield symbol. Generally passive crystals are 2 terminal devices.

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I mounted the crystal, I used a 4 terminal crystal on a previous design, though now using a 2 pin would have been much easier to verify.

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plenty of 4 pin crystal packages around. 2 active, 2 shield.
Drtech- 0 ohms, yeah, that’s why I got you to measure those pins with an ohm meter. the voltage syou measured suggested a short. get the hot air tool out, pre-heat from underside and remove and scrap that xtal . (will be overheated after removal, most likely, not reliable)

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Actually, I realized my probes were touching when measuring, all I see is OL regardless of my meter setting

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I’ve temporarily closed this topic for 24 hours. That will give OP a chance to figure out what the problem is and report back.

This topic is turning into a debugging session. It’s engineer nature to be curious about what the underlying problem is. We all love whatdoneit stories. But it’s starting to stray from the use of KiCad. So a little enforced break is warranted, IMO.

This topic was automatically opened after 24 hours.

suggest go to EEVBLOG.com -
try : Projects, Designs, and Technical Stuff - Page 1

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This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.