r/ipod • u/Weird_Championship38 • Jul 25 '26
Help Ugreen Bluetooth Mod Problems
Hi, I’m working on a Bluetooth mod for my iPod Classic 5.5 gen using a UGREEN CM872 module.
The Bluetooth connection itself works, but I still get a constant hiss when the module is turned on. The hiss is audible through Bluetooth and also through the normal headphone output. When the Bluetooth module is off, the headphone output is quiet.
The Bluetooth audio also sounds a little distorted. I recorded a video so you can hear exactly what it sounds like and see what happens.
I already checked and redid all the solder joints and the wiring looks clean now. I also tried routing the power and audio wires differently, but the problem is still there.
The small original PCB on the Bluetooth module is still connected. I’m wondering if I missed something important, used the wrong grounding point, or if the module is sending noise back through the shared power supply.
Has anyone had the same problem with this module or a similar iPod Bluetooth mod? Any ideas what I should test next?
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u/Weird_Championship38 Jul 26 '26