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I made very good performing experience with backside install (single mosfet) on switch lites (alt points of picofly-guide). So I dont need to open the apu-cover. On oleds I only used these flex-cables.
Yeah, I used to do back side as well, which usually works fine. But some switches tend to glitch slowly, or sometimes slowly, with back mosfet. On those switches I moved the mosfet to the APU and the issues went away - so now I just do APU directly instead.
I'm buying the chip's from Taobao. I'm unable to buy these from AliExpress in Germany for a good price.
I've come across a few switches that wouldn't glitch with only one wire to cap/gnd. with two to each it worked. so now i do both sp1+sp2 just in case the switch won't glitch with just one. easier to spend an extra minute (often unnecessarily) adding an extra wire than move the chip and open apu cover back up again because it won't work with just one.
some people might say that two mosfets work better for them, but I believe it is the extra wires that make it work better, not the extra mosfet.
You can use magnet or stripped single wire that runs on both sp1 and sp2 is enough. Deeps was correct regarding the single cap connection. Had issue with it failing after several boots of testing. The ground/source wire connect it as near the SoC chip as possible or use one the ground in the caps of SoC.
Switch should work without those caps. If its not working then you damaged something else.
You can check the placement of the 1uF or 2.2uF caps on the schematic
https://files.waveshare.com/upload/7/7f/RP2040-Tiny_V1.1_SCH.pdf
Last edited by psycho-neon,
Thank you actually the switch works fine I just want to change them with good ones it happened because I had the Error 2002-3539 that made me solder many times and finally I figured out it's related to Toshiba emmc and the solution is easy to boot into maintenance mode and make full formatting
The emmc is slow as hell, don't know if I would buy them.
I'm super happy with the Samsung emmc's, I'm using them since 2020.
The 8gb ram chips laying here and waiting for a customer.
Just did an OLED with SKHynix yesterday with single mosfet wired to the APU and Rp2040 Tiny. The first time powering up it just blinked blue for a very long time. So I held the power button down till it shut off, disconnected the battery then tried again. The next time it actually glitched, and seemed to get better with each power cycle.
Attachments
Probably 1-3 seconds. 0.2mm magnet wire from mosfet to drain and source, then 36awg from gate to tiny.
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