I’ve collected a number of RK3399 boards, testing them out with a view to including something ready-made in a relatively low volume product we’re working on. I’ve just bought a 4GB Rock Pi 4B (v1.3) to play with. Can’t see a serial number on the board, but the box reads RADXA1812-B1927.
I like the board design; there are lots of nice touches like the LPDDR4 RAM, proper USB-PD, M.2 connector and RPi-compatible DSI connector. For the most part, it seems very well made, and the surface mount work is impeccable.
But… the through-hole soldering on the test unit I’ve just bought is very uneven and generally a mess: often way too much solder, blobs left half-way up the leads, joints convex rather than neatly concave, etc.
If this were just a one-off unit for a personal project, I’d take a bit of time to desolder the existing joints and tidy them up, resolder the GPIO header, etc., but that’s a non-starter for integrating into a product if they’re all like that.
Have I got a one-off faulty (or repaired?) board, or are others’ boards similarly bodged?