exxos's DFB1 trials

[smoore100]

Cheers, think I have one of those from the jazz drive that came with the falcon, will check later.

Simon

[exxos]

I thought I'd mention this "problem" while I think about it..

I documented "somewhere" that my DFB1X stopped working for no reason. All the LEDs were inactive where only the white LED on reset would light up. I thought the PLD had died, so re-flashed it.. It was a bit of a puzzle..

Long story short, while removing the DFB1X last time, it seems the smaller header housing had "bent". I simply pushed the plastic housing back flush to the board and then everything worked perfectly afterwards!

It seems a bit of a weird one, but thought I would mention it in case someone else runs into these weird issues in the future..

[exxos]

I've released the V105 firmware. No critical fixes in this build.

See https://exxosforum.co.uk/atari/last/DFB1X/index.htm

[exxos]

Finally finished testing the latest DFB1X batch. But the last one is being a PITA :( It looked like a couple of the pisn were actually bent on the socket and not actually soldered to the pad. So I re-solder them down and didn't seem to make any difference. I did them again and again and then went round the whole lot still isn't working :roll:

It won't even get a desktop because it seems to lock up somewhere around trying to load MAPROM. When he did get to desktop once, I run the FPU test I think a couple of random first test passes then every single one failed.

I continuity checked every FPU pin, to the CPU, also GND 5V.. All seem fine and doesn't seem to be any shorts. The FPU tests fine in another board. I also tried a second FPU , same results.

Currently its in the ultrasonic cleaner having a good soak just to be on the safe side. It's rather baffling to say the least.

EDIT
Nope that wasn't it :roll:
I mean how can everything be connected and not work :shrug:

[Badwolf]

Nope that wasn't it :roll:
I mean how can everything be connected and not work :shrug:

Is it only the FPU not working (your second sentence mentions socket so inferring it's FPU)?

If so, given how many boards you have, either stick it to one side for later investigation or mark it down for failing the FPU and list it as such?

Or even both. If someone buys it before you decide to look at it again, so be it.

BW

[exxos]

Is it only the FPU not working

yes

(your second sentence mentions socket so inferring it's FPU)?

Picture speaks 1000 words...

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I resoldered the pins and continuity check them several times.. There doesn't seem to be anything wrong.. Unless the pressure of the FPU in socket is breaking a contact somewhere.. It's not the FPU IC itself...

Maybe I'm missing something obvious or silly, but don't see what. There are a couple of pins I'm going to reflow just to make sure.. Then I am done with it.

If so, given how many boards you have, either stick it to one side for later investigation or mark it down for failing the FPU and list it as such?
Or even both. If someone buys it before you decide to look at it again, so be it.

Yeah that anyone wants it at 20% off "bare bones" with no FPU support.. I have enough projects without getting bogged down by silly things like this...

EDIT:
Now its stopped booting without the FPU.. hmmm..

[Badwolf]

I resoldered the pins and continuity check them several times.. There doesn't seem to be anything wrong.. Unless the pressure of the FPU in socket is breaking a contact somewhere.. It's not the FPU IC itself...

If the bottom pins were bent enough to fail a reflow, perhaps something else is awry in that socket, but they're a PITA to get off and back on again.

Let someone else have at it, I reckon.

If it were for me personally, as a hobby build, I'd probably cut the socket up and whip it off then solder the FPU directly onto the pads. But I don't think it's worth your time in case even that doesn't work.

BW

[exxos]

If it were for me personally, as a hobby build, I'd probably cut the socket up and whip it off then solder the FPU directly onto the pads. But I don't think it's worth your time in case even that doesn't work.

Yeah I did wonder that myself but starting to get a lot of faffing about but it's not working without the FPU now :roll:

I have a quick look around other pins to see if there is any other bad solder joints etc but not really worth spending my time on.

[Badwolf]

Yeah I did wonder that myself but starting to get a lot of faffing about but it's not working without the FPU now :roll:

At least you can send your photo to the assembly team and ask for your £1.50 back!

BW

[exxos]

At least you can send your photo to the assembly team and ask for your £1.50 back!

Already did that about a week again...

Thank you very much for your further feedback. After internal verification, we have identified the causes of the issue as follows:

The incoming materials had slight deformation (warpage), which prevented the solder from making full contact with the material pins.
As we have changed to use the latest 3D AOI equipment, our staff are not proficient in operating the newly commissioned online 3D-AOI inspection equipment. During equipment commissioning, the height threshold for pin warpage was set too high. This resulted in the failure to detect cold-soldered warped pins that were below this threshold.

Going forward, we will strengthen the operational training for our staff on the updated equipment. Additionally, in accordance with the actual welding quality requirements of the products, we will reassess and optimize all detection parameters of the equipment, and establish more accurate inspection models.

For the 2 damaged boards, we will provide a $50 coupon to be used for the production of your next order.

If there are more defective boards found after full testing, please feel free to inform us at any time—we are willing to bear the losses arising therefrom. We sincerely apologize for the inconvenience caused hereby.

Found the feker!!!

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