Key not working - is it repairable?

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Kierownik
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Key not working - is it repairable?

Post by Kierownik » Sat Jul 14, 2018 12:39 pm

Hi everyone.
So one of my fobs is not working. Can't unlock/lock the car. Car won't start when pressing the "start" button. Car will only start if I hold the key to the steering column and then press start. So it looks like it's not transmitting the signal at all.
I decided to open it and see what's going on inside. What I found is very strange. It looks like one of the chips on the motherboard somehow got damaged. It wasn't done by me, as I was very careful when opening the fob.
Here are the photos of how it looks...
Image

And here's something strange on the the top side of the fob, where the buttons are...
Image

Image

Don't know how this could've happened. Key didn't look like it was opened ever before. I also tried to find pieces of that damaged chip inside of the fob housing but there wasn't any.

Do you think that this is repairable? Or is it dead for good and only the only way is new fob from the dealer? If that's the case, anyone knows how much that will cost?

Thanks for your help!
Last edited by Kierownik on Sat Jul 14, 2018 7:41 pm, edited 1 time in total.
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Dan116i
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Re: Key not working - is it repairable?

Post by Dan116i » Sat Jul 14, 2018 1:11 pm

A key is a few hundred pound and requires ordering from Germany

Alternatively... maybe a tech specialist can do something?
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Re: Key not working - is it repairable?

Post by Octavius » Sat Jul 14, 2018 1:23 pm

One of the surface mounted components has vapourised. Could be built in protection to save it going up in smoke.
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Re: Key not working - is it repairable?

Post by riccie_120i » Mon Jul 23, 2018 10:33 am

this place have sucessfully repaird wet/broken bmw park distance cnotrol PDC units before. You could email them and request info. I was going to send mine to them for repair.

http://www.nova-electronics.co.uk/

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Re: Key not working - is it repairable?

Post by Kierownik » Tue Jul 24, 2018 12:18 pm

riccie_120i wrote:
Mon Jul 23, 2018 10:33 am
this place have sucessfully repaird wet/broken bmw park distance cnotrol PDC units before. You could email them and request info. I was going to send mine to them for repair.

http://www.nova-electronics.co.uk/
Thanks, I'll send them an email.
2013 F20 116d M Sport - RED - because reds are the fastest :-D Well mine isn't, stock 116d but damn she's beautiful.

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Re: Key not working - is it repairable?

Post by riccie_120i » Tue Jul 24, 2018 4:56 pm

this sounds promising for you
"Pop into Nova Electronics, the Sheffield electronics specialist for a low-cost fix instead. That’s because we repair all types of Printed Circuit Board (PCB), one of which sits inside your car key.

So whether it’s a broken car key or another electronic device, let our engineers have a look. If it’s the PCB (the chances are it is), then we can fix it. And you can pocket the price difference."

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Re: Key not working - is it repairable?

Post by Kierownik » Tue Jul 24, 2018 5:57 pm

Yeah I've sent them an email with some pictures. Now waiting for reply.
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Re: Key not working - is it repairable?

Post by Kierownik » Sat Jul 28, 2018 8:50 am

So they replied.
They said that they can't identify the missing component and I would probably have to buy a used fob (perhaps from scrapyard or something) so they could use it as a donor.
It might all together be just as costly as just buying a new fob from the dealer.
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Re: Key not working - is it repairable?

Post by fez_7 » Tue Jul 31, 2018 1:46 am

Strangely enough, I have a used fob in excellent condition for sale if interested. PM me for more details.
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Re: Key not working - is it repairable?

Post by riccie_120i » Tue Jul 31, 2018 12:13 pm

that is annoying. Can you or they not identify the component from a google image search?
https://www.google.co.uk/search?q=bmw+k ... ve&ssui=on

sorry it didn't help.

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Re: Key not working - is it repairable?

Post by Barney McGrew » Tue Jul 31, 2018 1:55 pm

How did you open the key.

Not being funny but looks like you took a blade too it or a Dremel? Could you have hit that component opening it - you say you were careful but that doesn't look like a sympathetically opened plastic case?

Just to rule out the obvious too, did you try a new battery before butchering it?

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Re: Key not working - is it repairable?

Post by Kierownik » Tue Jul 31, 2018 5:15 pm

Barney McGrew wrote:
Tue Jul 31, 2018 1:55 pm
How did you open the key.

Not being funny but looks like you took a blade too it or a Dremel? Could you have hit that component opening it - you say you were careful but that doesn't look like a sympathetically opened plastic case?

Just to rule out the obvious too, did you try a new battery before butchering it?
Yes mate, because both halfs of the fob are glued together I had to use a blade to open it. There's no other way to do it. However I was very very careful all the way round. Definitely didn't put the blade too deep. If I phisicaly damaged it then I'd be able to find pieces of it inside of the fob but there was absolutely nothing.
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Re: Key not working - is it repairable?

Post by Kierownik » Tue Jul 31, 2018 5:30 pm

riccie_120i wrote:
Tue Jul 31, 2018 12:13 pm
that is annoying. Can you or they not identify the component from a google image search?
https://www.google.co.uk/search?q=bmw+k ... ve&ssui=on

sorry it didn't help.
I've found pic like this and the missing component seems to be marked D163D. But googling it isn't really coming back with anything useful :cry:
Image
Image
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Re: Key not working - is it repairable?

Post by Nottsknots » Tue Jul 31, 2018 9:47 pm

Its a crystal oscillator.

Looks like the same circuit on here
https://f30.bimmerpost.com/forums/showt ... p=20958396

I cant find the same component on that circuit, but I can find the ATA5833 above it
https://www.microchip.com/wwwproducts/e ... =documents
Thats the RF transceiver.

Looking at the data sheet, and tracing pin 10 on page 5, that seems to route down to the mystery device, it shows as the crystal oscillator.
http://ww1.microchip.com/downloads/en/D ... asheet.pdf

Using that clue, and the id of the mystery device 24.305, thats a 24.305Mhz crystal in a 4 pad SMD package.
https://www.digikey.co.uk/product-detai ... ND/5873358

And the data sheet for that seems to fit (4 pads, two not connected, dimensions seem about right)
http://www.txccorp.com/download/product ... 0AV_39.pdf

So thats a £0.46 component, if you can find 1 (rather than buying by the thousand).

Piece of cake to replace if you have the right kit.

Now, the real question. WTF happened that blew a crystal, one of the most solid of solid state devices, into oblivion, and what else did it take with it. I'd be amazed if you could replace that component, and end up with a working ats got to have been one hell of a discharge.
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Re: Key not working - is it repairable?

Post by Kierownik » Wed Aug 01, 2018 9:01 am

Nottsknots wrote:
Tue Jul 31, 2018 9:47 pm
Its a crystal oscillator.

Looks like the same circuit on here
https://f30.bimmerpost.com/forums/showt ... p=20958396

I cant find the same component on that circuit, but I can find the ATA5833 above it
https://www.microchip.com/wwwproducts/e ... =documents
Thats the RF transceiver.

Looking at the data sheet, and tracing pin 10 on page 5, that seems to route down to the mystery device, it shows as the crystal oscillator.
http://ww1.microchip.com/downloads/en/D ... asheet.pdf

Using that clue, and the id of the mystery device 24.305, thats a 24.305Mhz crystal in a 4 pad SMD package.
https://www.digikey.co.uk/product-detai ... ND/5873358

And the data sheet for that seems to fit (4 pads, two not connected, dimensions seem about right)
http://www.txccorp.com/download/product ... 0AV_39.pdf

So thats a £0.46 component, if you can find 1 (rather than buying by the thousand).

Piece of cake to replace if you have the right kit.

Now, the real question. WTF happened that blew a crystal, one of the most solid of solid state devices, into oblivion, and what else did it take with it. I'd be amazed if you could replace that component, and end up with a working ats got to have been one hell of a discharge.
Thanks for your extensive reply.
Now that you mentioned it, I started wondering if this is the only damaged component or is there something else.
I'm loosing any hope that this could be fixed.
2013 F20 116d M Sport - RED - because reds are the fastest :-D Well mine isn't, stock 116d but damn she's beautiful.

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