Slim chances that is the FM antenna amplifier: he has the stations but has very faint sound ...
Here is my experience, the CD on my HU stopped working about 10 months ago. Then, the FM gave up on me. I looked around to get it repaired, and I found this alternate solution on some other BMW forum.
“Jimmy Chen in New Jersey will do repairs for a fraction of the cost. Jimmy posts repair services as auctions on eBay for BMW and Mercedes. I called Jimmy and talked w/him about the problem with my display. He said it could be repaired for $180 and to mail a check for the amount and the unit to him.
Finding only limited posts/comments about him, and the fact that there is no physical business I was a bit suspicious. I searched a bit more and found some positive comments/threads on the web and decided to go for it. I mailed my display to Jimmy, and about a week half later (I am in California) I got it back.
I plugged it in and it works perfectly. So far so good!
Disclaimer: While my experiences may not reflect what you might experience, I am completely satisfied with his repair and service. I'll keep you posted as to the longevity of the repair.
In case you have this problem, here is his info:
Alpine Electronics Repair
140 Hirshfeld Pl
New Milford, NJ 07646
email: [email protected]
Also, you should check the eBay # 180602808658.
In my case I wanted to get BT, iPod and NAV, so, I ended up with an aftermarket all-in-one HU that has LCD touch screen, tuner, GPS, BT, iPod, video, rear view camera, sat, SD card, USB, etc., for a total of ~$850 installed. I wish I would have done this swap four years ago. It’s such a difference.