No sound from speakers / PDC - Logic 7 top amp fail?
Discussion
My wife just casually texted to tell me that she had turned the volume up very loudly on the stereo of our 2005 e61 to drown out the shouts of a child whereupon the volume suddenly cut out completely. No sound from the stereo, PDC etc.
I will be able to check the basics myself this evening but does anyone know whether turning up the volume to a serious level COULD cause a fuse to blow? Even if a fuse had blown, I assume this might disable the stereo itself or the PDC and not just the speakers?
I understand an I-drive reset is the done thing in these circumstances but I cant see how that could help.
I am also led to believe that using my second keyfob might be a miracle cure but again, I cant really see how!
If I am looking at an L7 top amp, any bright ideas - I would rather not spend £1k on this problem if I can possibly help it!
Many thanks in advance......
I will be able to check the basics myself this evening but does anyone know whether turning up the volume to a serious level COULD cause a fuse to blow? Even if a fuse had blown, I assume this might disable the stereo itself or the PDC and not just the speakers?
I understand an I-drive reset is the done thing in these circumstances but I cant see how that could help.
I am also led to believe that using my second keyfob might be a miracle cure but again, I cant really see how!
If I am looking at an L7 top amp, any bright ideas - I would rather not spend £1k on this problem if I can possibly help it!
Many thanks in advance......
I don't really hear of L7 amps failing that often in the E60, but I've occasionally seen L7 amp repair listing on ebay which suggest they do fail.
Any how, this might be of interest to you if you're practically minded
https://www.youtube.com/watch?v=npJqhN2jPkM
Any how, this might be of interest to you if you're practically minded
https://www.youtube.com/watch?v=npJqhN2jPkM
home said:
I don't really hear of L7 amps failing that often in the E60, but I've occasionally seen L7 amp repair listing on ebay which suggest they do fail.
Any how, this might be of interest to you if you're practically minded
https://www.youtube.com/watch?v=npJqhN2jPkM
Many thanks!Any how, this might be of interest to you if you're practically minded
https://www.youtube.com/watch?v=npJqhN2jPkM
In fact, when I checked the car last night I noticed a number of things: SOS call failure light, ipod connector not found so reverted to CD multichanger on the idrive even though I do not have one, no paired phone found through Bluetooth setting, voice recognition not working etc etc. It was like being in my low-tech Alfa. I think all of these things are on the same fibre optic pathway and if one fails they all fail. Clever. So I think I will just take the car in for a component check. Hopefully it will be possible to isolate the faulty component and repair or replace it and all will be well again. It could be the amp but I dont really want to start playing if it is not. I guess I am lucky enough to drive a car I love and not begrudge it the odd big (and let's face it, this could be) bill despite its 11 years of age!
the fibre optic modules are connecting in a ring. If one fails, it stops playing pass the parcel and all of them stop playing.
The bluetooth module commonly fails, though you have an SOS warning which means you have a TCU which are supposed to be more reliable. I doubt your iDrive or iPod have died, and would doubt the HUD if you had one. That suggests it's the L7 at fault.
Luckily you can quickly test what the faulty item is by isolating that from the optic loop (and at least let the others pass the parcel...). Take the fibre optic plug off the L7 amp, remove the black plastic inner connector from it (look at it carefully and you'll figure out how), and then remove the blue plastic piece from the inner plastic holder and remove the fibre optic cables from that (you'll need a tiny screwdriver to push the release pins)
http://www.e90post.com/forums/attachment.php?attac...
Also be gentle with the black plug with blue plastic and don't force it.
N.B. Make a note of which fibre optic cable went into which hole as it's directional and won't work if they're connected in the opposite way.
Now for the fun part, ask someone to put the two fibre optic cables end to end to "complete the loop" so to speak, and then go test if the SOS failure's gone and iPod has come back. You won't have sound obviously as the L7 has been bypassed, but if everything's working then you know it's the amp at fault.
Annoyingly if this does fix it, I doubt the fault will be bad caps inside the amp as per the above video
The bluetooth module commonly fails, though you have an SOS warning which means you have a TCU which are supposed to be more reliable. I doubt your iDrive or iPod have died, and would doubt the HUD if you had one. That suggests it's the L7 at fault.
Luckily you can quickly test what the faulty item is by isolating that from the optic loop (and at least let the others pass the parcel...). Take the fibre optic plug off the L7 amp, remove the black plastic inner connector from it (look at it carefully and you'll figure out how), and then remove the blue plastic piece from the inner plastic holder and remove the fibre optic cables from that (you'll need a tiny screwdriver to push the release pins)
http://www.e90post.com/forums/attachment.php?attac...
Also be gentle with the black plug with blue plastic and don't force it.
N.B. Make a note of which fibre optic cable went into which hole as it's directional and won't work if they're connected in the opposite way.
Now for the fun part, ask someone to put the two fibre optic cables end to end to "complete the loop" so to speak, and then go test if the SOS failure's gone and iPod has come back. You won't have sound obviously as the L7 has been bypassed, but if everything's working then you know it's the amp at fault.
Annoyingly if this does fix it, I doubt the fault will be bad caps inside the amp as per the above video
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