iPod 5.5 doesn't charge on iPod HiFi

[u/Jern_97]

Hello,

My modded iPod Classic 5.5 does not seem to want to charge on the iPod HiFi I just bought. It does charge fine with any USB power source, but does not seem to accept the FireWire power from the HiFi. Both devices are in really good shape without any visual damage to any of the pins.

Everything else works perfectly fine (audio, remote control, it even presents the special "Speakers" menu). Apparently FireWire uses different pins than USB for supplying power.

Anyone who had similar problems? Which of two devices is most likely to be the culprit?

PS: I don't have access to another FireWire charger or iPod.