i have tested something like this for preheating XD https://www.amazon.de/FOHERE-3-Temperaturstufen-Lebensmittelgrad-Silikon-Wärmematte-3-Stunden-Automatik-Abschaltung-Lebensmittelwärmer/dp/B0DDQ1L7WN put pcb on it, max temp, wait 20 min, then use soldering iron and/or hot air
sounds like the tft panel connection is not good anymore? connection of the tft driver to the panel. maybe fpc directly soldered on driver board. device heats up and connection goes bad until fade to black?
try BAR - beyond all reason
yes i think so, but u would have to make sure the solder will rise through the through-hole as mich as possible. maybe u can try to find the faulty pin with wiggling them separately
pressfit connections usually are very reliable. if there is a poor connection i would presume that the barrel of the via is broken and a new pressfit connector will not help. maybe putting solder in would help. did you already test for poor connections?
ah well, then it doesn’t work proper with 5v unfortunately
usually fans have a min start voltage. u can try if your fan starts at 5v and if the resulting RPM is ok for you, just solder it without any resistor on USB
i assume its measured under laboratory conditions, so it seems ok to me. TCXO, OCXO should usually be operated within their operating voltage range. depends on type. usually i would assume 1.8-3.3v, but who knows without datasheet?
it could be worth a try to contact diodes and ask which components use or have used in the past V-QFN2030-12 (Type HE) package
looks very similar to that: https://www.ti.com/product/TPS566235
diodes uses packages like this one: https://www.diodes.com/assets/Package-Files/V-QFN2030-12-Type-HE.pdf but cant find FMM marking there …
unfortunately i neither could find anything. richtek has some weird packages like this:
or like this:
so i poked around their homepage. but could not find anything with that pinning. also FMM marking is not in their marking reference :(
How many pins does it have? I can’t see it properly in the image. Is it 4, 8 or 12 pins?
https://sensepeek.com/ do manufactur those nice PCBite SP10 probes. New improved series: SQ10 probes. They also have 500MHz Oscilloscope probes! They are awesome :D
Then there are those small pincers: https://at.rs-online.com/web/p/klemmprufspitzen/0775704 Or very small pincers: https://www.sks-kontakt.de/de/test-measurement/produkte/produkt?nr=9741011 (digikey lists them as manufacturer Altech Corporation)
Spring-loaded tips: https://www.sks-kontakt.de/de/test-measurement/produkte/produkt?nr=9739951
plug usb keyboard and at same time measure/observe usb voltage. does it stay 5v?