Recent whales include Madbean Aquababy and the PedalPCB Low Tide. In both cases I attempted to clean the flux using internet advice to employ isopropyl alcohol and a toothbrush.. Something must’ve gotten fluxed up, because both were DOA upon completion.
No amount of troubleshooting, chip swapping, or voltage measuring worked. In the end, I scavenged everything but resistors (measuring all components to ensure they were still within spec) and rebuilt on entirely new boards. Both worked the second time, so idk.