Messages

1

preenfm2 and preenfm3 / Re: Preenfm 3 - New build - Screen white

« on: March 31, 2021, 08:03:43 PM »

Wow I didn't expect you to answer this quickly. With "black" I mean that it lits up, but no graphics, no color or white light. See picture 1 in the attachment

. the firmware is not flashed (check a blue led is on or flashing on the preenfm3 PCB near the MCU).

It was flashing when I booted it up with power over USB and pressing the red menu key.

. the boo0 pins is not on "preenfm3" so it boots in DFU mode

I knew this was a thing but nothing changed when I swapped the jumper's position and rebooted.

. The "Led" pins on the TFT/pfm3 headers is badly sodered. check its voltage.

That was my thought too. I reflowed every pin but to no avail.

When I had it boot up with the menu key pressed, buttons 2 and 3 did do some flicker on the screen and I heard the connect/disconnect sound on my PC (hooked up via usb cable)

Now I went ahead with desoldering the TFT before I read your response. I read some posts in this forum in the meantime and decided to try things out myself. I figured I wouldn't get a fitting reply so quickly, which is usually the case in DIY forums.

When I first assembled the TFT onto the main board, I noticed some wonky solderleg of the SD card-reader onto the pcb. I soldered the TFT in anyways the first time. Then I thought after not getting any visual feedback; desolder the TFT again because it's likely due to the SD card not being read properly because of the damaged solder joint of the SD cardreader. Other reason I decided to desolder, is to install the headers now because this would be better in the future for repairs and overall fitting. During first assembly I did a bad job by not using any headers between both pcb's so detaching the TFT would be very difficult, which I experienced today. Long story short,  the TFT is disassembled now.

You think that leg on the right of the sd-cardreader might be the issue? (see picture 2 of attachment)

2

preenfm2 and preenfm3 / Re: Preenfm 3 - New build - Screen white

« on: March 30, 2021, 09:31:50 PM »

I have a similar issue. Also did the Van Daal build. Not a fan of their instructions with the TFT. Quite confusing since they leave you with spacers and headers they  doesn't mention in the instructions. Didn't use them because I tried rushing things, but I should have used them and read the instructions on github also.

The issue I have is that my screen stays black. I'll try resoldering all the solderjoints of the headers first.

I have the same black pcb as you, TwistedGenetics, and the holes for the headers on that pcb were really narrow. So narrow I couldn't fit the headers in, unless I had to force it and give it a few whacks.