Reply To: Super hot U5 and no leds ON on OSSC 1.6
Interesting -> your OSSC layout differs a bit from the official 1.6 layout… which can be found on marqs github:
That could be problematic for finding a replacement part. Because i don’t know for sure, if for U5 the part from the official BOM was used. It is probably a different voltage regulator with a different pinout. I assume this, because:
- Your U5 is upside down, but the filter capacitors for the input and output voltages (= C31 and C93) haven’t switched places -> there must be a reason for it.
- Your U5 probably isn’t a AP7361C, since if it were, its 5V input would be connected to ground. But: that’s not the case for you, because it’s clearly visible in your pictures that the 5V input is connected to the outer of the three pins on U6, which are NOT connected to ground.
Switched input/output-pins for your U5 means: not the 5V input is shorted to ground, but its 3.3V output. Which would make sense: the input pins of your U7, U9, U12, U13, U14, U15 were all shorted to ground on your OSSC, which are all connected to the 3.3V output line of U5.
In conclusion: your OSSC uses a voltage regulator for U5, where (compared to an AP7361C) the input and output pins are switched. Which means: you can’t replace your U5 with an AP7361C, since it has the wrong pinout for your unofficial/modified OSSC! So: DON’T BUY AN AP7361C AND PUT IT IN! You would fry it!
Now for the more problematic part: what’s written on your U5? Since it is not a AP7361C, the markings may help to find a suitable replacement…
Would anybody have recommendation for another reliable supplier for Europe ?
For Europe i would recommend lcsc.com, tme.eu or rs-online.com. All provide reasonable shipping costs and have European warehouses or ship from/over European countries. While lcsc.com has the biggest selection of components, it’s the slowest for shipment, since it’s based in China.
