Locating Pin 1 on JFP1 | Generated by AI
Not necessarily — “edge-most” isn’t a reliable rule since header orientation varies by board layout. What you want to look for instead:
- A printed “1” on the PCB silkscreen right next to the header — MSI almost always marks pin 1 this way, usually in tiny white text.
- A square/rectangular solder pad — pin 1’s solder pad on the underside (or sometimes visible from top as a slightly different pad shape) is typically square while all others are round. This is a very reliable convention across virtually all motherboard headers, not just JFP1.
- The missing pin 9 — since JFP1 is a 2×5 block with pin 9 physically absent, once you find that gap, pin 1 is on the same row as the gap, at the opposite end of that row from the gap. So if the missing pin (9) is on the far end of one row, pin 1 is the near end of that same row.
Concretely: the header is two rows of 5. One row is 1-3-5-7-9(missing), the other is 2-4-6-8-10. Pin 1 and pin 9 are on the same row; pin 1 is the end of the row furthest from where the gap sits, pin 2 sits directly across from pin 1 on the other row.
If you can get a clear photo of the header (even a phone pic), I can confirm pin 1’s exact position for you rather than you having to guess from silkscreen text, which can be tiny and easy to misread.