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NeilShar22
Newbie
Joined: 13 Jul 2016
Posts: 22
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 Posted: Sun May 14, 2017 5:17 pm Post subject: Buggered OBC
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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: 8819
Location: West London
1995 Porsche 993 Carrera 4
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| Posted: Sun May 14, 2017 5:37 pm Post subject:
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......... 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 ...... 
I am sure a younger owner with half a brain will be along shortly to perhaps your question in great detail .......
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dommorton
Zolder
Joined: 16 Mar 2008
Posts: 5031
1998 Porsche 993 Carrera 4S
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| Posted: Sun May 14, 2017 5:42 pm Post subject:
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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.
_________________
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: 8819
Location: West London
1995 Porsche 993 Carrera 4
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| Posted: Sun May 14, 2017 5:49 pm Post subject:
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Well ...... as I said a younger and more ...... er ....... knowledgeable 933 owner would rock up ....... but I am still none the wiser ......... 
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dommorton
Zolder
Joined: 16 Mar 2008
Posts: 5031
1998 Porsche 993 Carrera 4S
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| Posted: Sun May 14, 2017 5:52 pm Post subject:
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OBC = On Board Computer 
There's an LCD in the Rev Counter where OBC fitted.
_________________
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: 8819
Location: West London
1995 Porsche 993 Carrera 4
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| Posted: Sun May 14, 2017 5:55 pm Post subject:
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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
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| Posted: Sun May 14, 2017 6:18 pm Post subject:
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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!)
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dommorton
Zolder
Joined: 16 Mar 2008
Posts: 5031
1998 Porsche 993 Carrera 4S
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| Posted: Sun May 14, 2017 6:22 pm Post subject:
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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.
_________________
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
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| Posted: Sun May 14, 2017 6:35 pm Post subject:
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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
Joined: 25 Oct 2009
Posts: 11575
Location: Cheshire
1993 Porsche 964 Anniversary
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| Posted: Sun May 14, 2017 6:48 pm Post subject:
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| 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
_________________
Me? The 13th Duke of Wybourne? Here? In a sixth form girl's dormitory? At three o'clock in the morning? With my reputation? What were they thinking of?
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ToreB
Approved Trader
Joined: 13 May 2010
Posts: 531
Location: Oslo, Norway
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| Posted: Sun May 14, 2017 8:13 pm Post subject:
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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
_________________
'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
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| Posted: Sun May 14, 2017 8:21 pm Post subject:
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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: 2322
Location: Caterham. Surrey
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| Posted: Sun May 14, 2017 8:29 pm Post subject:
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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
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| Posted: Sun May 14, 2017 8:39 pm Post subject:
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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: 8819
Location: West London
1995 Porsche 993 Carrera 4
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| Posted: Sun May 14, 2017 9:13 pm Post subject:
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| 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 |
........ indeed ......... 
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Endoman
Imola
Joined: 11 Apr 2011
Posts: 792
Location: Bolton U.K.
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| Posted: Thu May 18, 2017 5:20 pm Post subject:
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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.
_________________
Porsche 944 S2 Coupe Guards Red
Porsche 993 Coupe 9m RS Replica
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NeilShar22
Newbie
Joined: 13 Jul 2016
Posts: 22
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| Posted: Tue May 23, 2017 11:22 pm Post subject:
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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... 
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