I measured all the transistors following Mr. Carlson's
video and they all were ok. Then measured also all capacitors and found one presumably capacitor, this marked C912 which measured short (0.2ohm). It's white and the silkscreen print tells C so I assume it to be capacitor and not inductor or like. However the white color makes me wonder. Should I try removing it and then testing whether it works?
This Capacitor is in that 5V buck converter circuitry and I was able to measure the 5V present at the PAM8620 amplifier so that makes me wonder whether this actually makes any differences..
edit: it seems to be connected to the trace between the
AP1509 output and inductor. According to the AP1509 datasheet example schematic there is no other components than Schotty diode there, so its purpose is unknown?