[asyncmeow]

Hello!
Working on the same batch of Tangaras as my last post where I was having issues flashing them, and I'm hitting another few issues:

1. Is it common for the FFC connectors to fail in such a way where they don't latch closed? I've had this on two out of the ten connectors out of my set of 5 Tangaras, and haven't had luck replacing them (this batch was pre-assembled by PCBWay, and my surface-mount rework skills aren't the best...)
2. On some of mine, the touch wheels are too sensitive and on others they don't work at all (or both on the same unit intermittently) - is there a way to debug this? Any tips that I should follow during assembly to make sure it works properly?

[ailurux]

Hello!
Working on the same batch of Tangaras as my last post where I was having issues flashing them, and I'm hitting another few issues:

1. Is it common for the FFC connectors to fail in such a way where they don't latch closed? I've had this on two out of the ten connectors out of my set of 5 Tangaras, and haven't had luck replacing them (this batch was pre-assembled by PCBWay, and my surface-mount rework skills aren't the best...)
2. On some of mine, the touch wheels are too sensitive and on others they don't work at all (or both on the same unit intermittently) - is there a way to debug this? Any tips that I should follow during assembly to make sure it works properly?

1. I wouldn't say that's common, in that I've not experienced that with any of the units we assembled. That sounds quite frustrating! 

2. The touch wheels are quite sensitive to any air gaps or dust or moisture between the touchwheel covers and the pcb. Our process was to use a thin double sided adhesive tape in the "cat ear" corners of the touchwheel covers, and stick them to the faceplates using the front half of a case as a guide for alignment (placing the touchwheel in its intended position in the case with double sided tape applied and pressing the faceplate onto it). 

Hope this helps!

[larsimore]

What are the factors that influence the sensitivity/operation of the touch wheel? For me, it works out of the case and with the cover sticked on like @ailurux suggested. However, if I put the case together, it just goes haywire or stops responding altogether.

[ailurux]

What are the factors that influence the sensitivity/operation of the touch wheel? For me, it works out of the case and with the cover sticked on like @ailurux suggested. However, if I put the case together, it just goes haywire or stops responding altogether.

Is anything contacting the area underneath the touch wheel when the case is put together? If you've got the haptic motor on the faceplate it should be stuck down away from the touch wheel, and make sure its able to fit together with the mainboard and not getting in the way of anything. Does it work in the case if you don't tighten the screws?

[larsimore]

What are the factors that influence the sensitivity/operation of the touch wheel? For me, it works out of the case and with the cover sticked on like @ailurux suggested. However, if I put the case together, it just goes haywire or stops responding altogether.

Is anything contacting the area underneath the touch wheel when the case is put together? If you've got the haptic motor on the faceplate it should be stuck down away from the touch wheel, and make sure its able to fit together with the mainboard and not getting in the way of anything. Does it work in the case if you don't tighten the screws?

I think the battery wire may be slightly touching the back of the faceplate – is that enough for interference?

[ailurux]

What are the factors that influence the sensitivity/operation of the touch wheel? For me, it works out of the case and with the cover sticked on like @ailurux suggested. However, if I put the case together, it just goes haywire or stops responding altogether.

Is anything contacting the area underneath the touch wheel when the case is put together? If you've got the haptic motor on the faceplate it should be stuck down away from the touch wheel, and make sure its able to fit together with the mainboard and not getting in the way of anything. Does it work in the case if you don't tighten the screws?

I think the battery wire may be slightly touching the back of the faceplate – is that enough for interference?

That should be fine. Is the ribbon cable connecting the two halves able to flex enough to not cause issues when the case is put together? If you're able to share a photo of what it looks like out of the case and when put together, I can also take a look to see if there's anything visually obvious.