I've now got pretty much the same problem here. Solder points are all good, everything triple-checked with a suitable ohm-meter, the buttonhack LEDs all turn on/off just fine on command from (customized) Hijack. But display is now very dim, standby LED is on when display is on, off when display is off, and the unit ignores the remote.

Soldering job was as close to immaculate as possible by hand, but something somewhere is unhappy.

I'll track it down eventually.

-ml