Can someone help?
Radio appears to scan for stations etc but no sound!
the 6-CD player works fine ...

Ideas? suggestions?
Thanks in advance ...


Sam

Hello Sam,

I once had a simular problem with a E39 BMW car radio. This one gave max
volume to the right front speaker.
The problem was a NVM (24C08 or equal) IC inside the radio. This was working
incorrectly, 0's were at some locations set to 1. To solve open the radio
find the IC, solder it out. Copy the current contents to a new IC, put that
in the radio. Next it should be ok again.

It's quite a specialist job, but a hobbiest with a eprom reader/programmer
can also do it.

Best regards,
Marcel, '92 525i 340.000 km.

"Sam M" <NOSPAMsamajd@gmail.com> wrote in message
newsan.2006.10.04.20.33.47.784020@gmail.com...

Thanks man ... but that is just beyond my scope and capabilities.
So the culprit is the radio not the cassette deck ... right?

Hopefully you are aware that the 740iL has a Cass Deck Unit ; a DSP; Radio
and an Amplifier Unit ... it is a fairly elaborate setup ... I am not sure
how that compares with the 525i ...

In any event, Thanks for the response.

Perhaps I can try and purchase a used radio/unit on eBay or something ...

Cheers,

Sam



"Marcel Vollebregt" <marcel.vollebregt@pphilipps.com> wrote in message
news:50d53$4524d9fb$c2abfc64$10074@news1.tudelft.n l...

Can't manage to understand how reading the corrupted contents of a 27C08
allowed you to reprogram correctly another chip. Unless you've the source on
a readable media.
May you provide a little bit more elaborated explanation please ?

TIA

[...]

"Marcel Vollebregt" <marcel.vollebregt@pphilipps.com> wrote in message

[...]

Hello,

What I saw when I read the eprom from a location, the value was always 0xF0.
So the first 4 bits were always stuck to 1, the lower bits vary. I read the
eprom, wrote the old data into the new eprom.
I think the permanent stuck to 1 occured by reading/writing the value's to
many times. Normally they are in the spec of an IC.

The software inside the radio reads the value, if the value was not
correct/changed it tries to overwrite it with the correct value eg 0x10. A
sort of range checking.

Best regards,
Marcel

"frischmoutt" <frischmoutt@ici.com> wrote in message
news:4527aaa6$0$27385$ba4acef3@news.orange.fr...

Thought I'd post this info from a separate thread I had going with a shop
that does this for a living ...
It would appear that in my case at least, the problem is the cassette deck
and NOT the radio or amp ...
While he did not indicate exactly what is wrong with the cassette deck, I
suspected something like this ... because the radio "appears" to scan etc
.... i.e looks to run but no sound ...

It behaves almost like it thinks that I should be playing the cassette tape
not the radio ... something in there is "tripped" ...

Here is the message from Radioman Inc., staff to me ... I picked his link
from my local BMW Club Chapter Site ..
I will report on the progress ... or resolution ...


<><><><><><><><>
The cost of repair is $175 and takes a few days. send in the cassette unit.
Our warrantee is for one year. Ship to:

Radioman Inc.
3801 Gaines St.
San Diego, CA 92110

John
<><><><><><><><




"Marcel Vollebregt" <marcel.vollebregt@pphilipps.com> wrote in message
news:2edc1$452a028a$c2abfc64$22849@news2.tudelft.n l...

Hello,

What I saw when I read the eprom from a location, the value was always 0xF0.
So the first 4 bits were always stuck to 1, the lower bits vary. I read the
eprom, wrote the old data into the new eprom.
I think the permanent stuck to 1 occured by reading/writing the value's to
many times. Normally they are in the spec of an IC.

The software inside the radio reads the value, if the value was not
correct/changed it tries to overwrite it with the correct value eg 0x10. A
sort of range checking.

Best regards,
Marcel

"frischmoutt" <frischmoutt@ici.com> wrote in message
news:4527aaa6$0$27385$ba4acef3@news.orange.fr...