Messages

1

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 21, 2017, 08:29:12 AM »

Pretty certain it's a yellow OLED. I'm not sure how to tell the difference between the two without it being turned on. I did see some yellow squares very briefly at one point.

I don't know where I got 68k. Duh, but I've taken it out. I tried it with nothing, a resistor pin, and a 22 ohm, but no change.

I haven't cut any of the pins for the mod.

I'll check those pins. I may try removing the solder on the header and redo it.

Worse case, I'll try and find someone in the US that is more experienced than DIY electronics to look at it.

Thanks Xavier (and company)

2

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 18, 2017, 02:35:19 AM »

I found a 68k resistor (purloined from my Jasper BOM) and put it in there.  Same behavior.

I did short the pad with a resistor pin, so I didn't miss that.

Another thing I didn't mention, is that the kit I got came with the shield mod - a steel plate with some additional spacers.  It also came with a red wire, which the build instructions didn't address.  Am I supposed do do something with that wire?

UPDATE - Found the instructions for the wire.  "You have to cut the pin 2 of the OLED header then link pins 2 and 15... See the red wire on the picture above and the missing pin between the OLED and the preenfm PCB. I remove the whole pin but simply cutting it on the OLED side will work."

Doesn't help with the display.    I don't want to have to order another kit or give up and buy an assembled one. 

3

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 18, 2017, 01:37:57 AM »

Shit, all I have sitting around are some ancient 51k and 15k resistors, which I tried adding in series to the slot, but it didn't work.  One of my next BOMs for another project, I'll have to add a 68k to that if this is indeed the problem.  Argghh!  So close. 

4

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 17, 2017, 10:28:55 PM »

I think I snipped the 68k off before I even turned it on!  I probably have another one laying around from another project so I'll put it back in there and see if that makes a difference.  Maybe it is just the backlight and I can't see the characters.

5

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 17, 2017, 04:25:32 AM »

Photo 4

[attachment deleted by admin]

6

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 17, 2017, 04:25:14 AM »

Photo 3

7

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 17, 2017, 04:24:47 AM »

Photo 2

[attachment deleted by admin]

8

preenfm2 and preenfm3 / Re: seems to work, but no display

« on: January 17, 2017, 04:24:13 AM »

I reflowed the solder on the female display header on the PCB, as it looked a little rough.  Didn't seem to make a huge difference, but I could swear that I saw some yellow lines on the OLED on one of my attempts to boot it with the display attached.  I had the USB drive in at the time, but took it out for the photos.

9

preenfm2 and preenfm3 / seems to work, but no display

« on: January 16, 2017, 02:57:43 AM »

I finally build my PreenFM2 kit from Van Daal, and it appears to work, but I have no display.  The LEDs flash, and I get stereo sound from each of the 5 switches when I hold down the menu key.  Both USB and 9v + work.

All the voltages check out from the image on http://ixox.fr/forum/index.php?topic=63509.0.

I do have one question.  I have a 5c revision of the board in the kit from Van Daal.  For the OLED resistor, should it be 22, 68, or just a short?  The build documentation is a little confusing, as it says to use 22 in one place, and a resistor pin in another paragraph for the OLED screen, but the board is labeled 68.

I am pretty much a beginner solderer, but I'm fairly confident all my joints are solid.