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NeilShar22
Newbie


Joined: 13 Jul 2016
Posts: 22



PostPosted: Sun May 14, 2017 4:17 pm    Post subject: Buggered OBC Reply with quote

Seems like my OBC in my '96 C4S has packed up. Any thoughts on:

1 - where I could get it repaired? Have asked my indie to give Tore a call as I am out of the country at the moment. I know that he has tried a couple of other places also but with no result.

2 - where I could perhaps get a replacement. Either new or used. Seems like a new one could be c£1,000!!!

:-(

Thanks

Neil
 
  
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madalaa
Yas Marina


Joined: 13 Mar 2008
Posts: 8907
Location: West London

1995 Porsche 993 Carrera 4

PostPosted: Sun May 14, 2017 4:37 pm    Post subject: Reply with quote

......... scratches head in confusion ....... what exactly is the OBC? ...... I am sure I will have a "doh" moment when you explain further ....... and also I am old dinosaur fart ....... hence I own a 993 ...... and wear sandals with socks ...... not necessarily white ...... Smile

I am sure a younger owner with half a brain will be along shortly to perhaps your question in great detail ....... Smile
 
  
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dommorton
Zolder


Joined: 16 Mar 2008
Posts: 5041


1998 Porsche 993 Carrera 4S

PostPosted: Sun May 14, 2017 4:42 pm    Post subject: Reply with quote

With the ign on give the rev counter a firm smack with the palm of your hand. It's been known to put OBC's back in to active service many a time.
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Good cars can get you from point A to point B. And great cars? Well, they'll just get you into trouble.
 
  
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madalaa
Yas Marina


Joined: 13 Mar 2008
Posts: 8907
Location: West London

1995 Porsche 993 Carrera 4

PostPosted: Sun May 14, 2017 4:49 pm    Post subject: Reply with quote

Well ...... as I said a younger and more ...... er ....... knowledgeable 933 owner would rock up ....... but I am still none the wiser ......... Dont know
 
  
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dommorton
Zolder


Joined: 16 Mar 2008
Posts: 5041


1998 Porsche 993 Carrera 4S

PostPosted: Sun May 14, 2017 4:52 pm    Post subject: Reply with quote

OBC = On Board Computer Thumb

There's an LCD in the Rev Counter where OBC fitted.
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Good cars can get you from point A to point B. And great cars? Well, they'll just get you into trouble.
 
  
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madalaa
Yas Marina


Joined: 13 Mar 2008
Posts: 8907
Location: West London

1995 Porsche 993 Carrera 4

PostPosted: Sun May 14, 2017 4:55 pm    Post subject: Reply with quote

Thanks Dom ....... that is a weight off my mind ....... and having one of the older variants ........ mine came without ...... lol
 
  
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NeilShar22
Newbie


Joined: 13 Jul 2016
Posts: 22



PostPosted: Sun May 14, 2017 5:18 pm    Post subject: Reply with quote

Sorry for not being clearer! On Board Computer.

I have given it a thump but might try again, slightly harder!! To explain the issue further, I do have a display but nothing is changing on the computer, speedo always 0, temp, range etc not changing.

The garage has done what they can, they believe that the signals are getting to the unit but nothing registering (I can't add more info here!)

Dont know
 
  
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dommorton
Zolder


Joined: 16 Mar 2008
Posts: 5041


1998 Porsche 993 Carrera 4S

PostPosted: Sun May 14, 2017 5:22 pm    Post subject: Reply with quote

Ah ok that's a different matter then. Usually it's just the LCD that's gone out.

Tore fixes the heads and may be able to give a steer on other checks to carry out.

Did the garage disconnect and reconnect the Battery? Might be worth a shot as another freebie attempt.
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Good cars can get you from point A to point B. And great cars? Well, they'll just get you into trouble.
 
  
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NeilShar22
Newbie


Joined: 13 Jul 2016
Posts: 22



PostPosted: Sun May 14, 2017 5:35 pm    Post subject: Reply with quote

Yep, that's been done too, naturally quite a lot as the battery was duff. Been changed now and not changed anything.

Thanks for your ideas Dom.
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11777
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Sun May 14, 2017 5:48 pm    Post subject: Reply with quote

madalaa wrote:
Thanks Dom ....... that is a weight off my mind ....... and having one of the older variants ........ mine came without ...... lol


Majority that have OBC also have air con Thumb
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ToreB
Approved Trader


Joined: 13 May 2010
Posts: 537
Location: Oslo, Norway


PostPosted: Sun May 14, 2017 7:13 pm    Post subject: Reply with quote

This is a typical fault of the OBC, a chip inside it fails due to age, and is easily replaced. I repair this, as well as do seveal other modifications to the instrument to avoid future damage.
Please do not hit the instruments. This might fix backlight bulb that has intermittent contact, but will mostly cause other damage.
Cheers,
Tore
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'95 993 C4

Bergvill F/X
Porsche electronics specialists, products and repair services.
 
  
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NeilShar22
Newbie


Joined: 13 Jul 2016
Posts: 22



PostPosted: Sun May 14, 2017 7:21 pm    Post subject: Reply with quote

Hi Tore, I was hoping that you would pop up! I emailed you directly earlier today and have just sent you a pm.
 
  
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stuttgartmetal
Indianapolis


Joined: 23 Feb 2009
Posts: 2336
Location: Caterham. Surrey


PostPosted: Sun May 14, 2017 7:29 pm    Post subject: Reply with quote

Misty instruments do them no favours.
I'd have tried the airing cupboard first.
 
  
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NeilShar22
Newbie


Joined: 13 Jul 2016
Posts: 22



PostPosted: Sun May 14, 2017 7:39 pm    Post subject: Reply with quote

The hasn't been any moisture in the dials at all, if that's what you mean. It literally just stopped working one day.
 
  
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madalaa
Yas Marina


Joined: 13 Mar 2008
Posts: 8907
Location: West London

1995 Porsche 993 Carrera 4

PostPosted: Sun May 14, 2017 8:13 pm    Post subject: Reply with quote

Zingari wrote:
madalaa wrote:
Thanks Dom ....... that is a weight off my mind ....... and having one of the older variants ........ mine came without ...... lol


Majority that have OBC also have air con Thumb


........ indeed ......... Wink
 
  
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Endoman
Imola


Joined: 11 Apr 2011
Posts: 833
Location: Bolton U.K.


PostPosted: Thu May 18, 2017 4:20 pm    Post subject: Reply with quote

I have a working surplus to requirements OBC revcounter with white face. My black faced one had the transistor replaced locally as Tore said it's the weak point causes flickering background illumination.
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Porsche 993 Coupe 9m RS Replica
 
  
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NeilShar22
Newbie


Joined: 13 Jul 2016
Posts: 22



PostPosted: Tue May 23, 2017 10:22 pm    Post subject: Reply with quote

Thanks for the offer. My dials are black and not sure if the computer is swappable. My unit is currently lost in the Norwegian postal system in the hope that Tore can fix it, if we ever find it that is... Question
 
  
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