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Eggman
Spa-Francorchamps


Joined: 30 Dec 2007
Posts: 322



PostPosted: Thu Feb 07, 2008 6:37 pm    Post subject: Another minor niggle (OBC display problem with solution) Reply with quote

Hi guys,

Did a little search couldn't find anything in reference to this problem I have.

The back-lit dispay thats shows MPG, Speed etc etc on the clocks of my 993 TT has a problem. The back light was flickering for a week or so, and it has now gone completely. Not a problem in the day light but obviously an annoyance at night.

Anyone experienced the same and/or know how to fix it per chance?

Many thanks!
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993C2S
Zolder


Joined: 05 Aug 2005
Posts: 5996
Location: Berkshire

1997 Porsche 993 Carrera 2S

PostPosted: Thu Feb 07, 2008 7:10 pm    Post subject: Reply with quote

Very common problem for the OBC I'm afraid eggman.

If you're lucky it's just the bulb. More likely however is the printed circuit board develops a fault knocking out the illumination.

Alan @ Aceparts has managed to fix the problem with a bit of niffty soldering. So when you turn the lights on, the OBC is illuminated. Alternatively you'll need to replace the rev counter! £611 + VAT from your friendly stealer Surprised The price is etched on my brain from almost 3 years ago! Rolling Eyes

When the OBC works correctly it'a actually illuminated all the time.

My OBC did the same as yours and it turned out to be the circuit board :cry:

I managed to find a perfect secondhand rev counter with OBC and it's been fine for the last 2.5 years (touching wood!)
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Eggman
Spa-Francorchamps


Joined: 30 Dec 2007
Posts: 322



PostPosted: Thu Feb 07, 2008 7:38 pm    Post subject: Reply with quote

A gent and a scholar, will do a little investigation thank you.

Having only recently purchased the car, what with storage beforehand and and the valet on sale there was a lot of condensation in her.

Even the clocks got effected, wonder if this had anything to do with it perhaps???

Either way a course of silica "dry-boxing" and air-con en route have seen an end to that problem.
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Seagull
Estoril


Joined: 22 Aug 2005
Posts: 3657



PostPosted: Thu Feb 07, 2008 9:31 pm    Post subject: Reply with quote

If it is the bulbs, you'll be surprised how much they cost. You can't get them from Halfrauds and your local friendly OPC charge the princely sum of £6.78 + VAT each. The ones that illuminate the gauge are 1.5 W and the ones for the idiot lamps are 0.9 W. I don't know what the OBC ones are but the 1.5s are yellow and the 0.9s are green. You'll need to test them with a multi-meter or a power source as you can't always tell they're blown by looking at them (either 9 or 12 V DC will do) The standard rev counter has 2 yellows and 3 greens.
 
  
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993C2S
Zolder


Joined: 05 Aug 2005
Posts: 5996
Location: Berkshire

1997 Porsche 993 Carrera 2S

PostPosted: Thu Feb 07, 2008 9:58 pm    Post subject: Reply with quote

Bulbs from your OPC? Finger

Buy them from here:

dash bulbs at knock down prices!
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Eggman
Spa-Francorchamps


Joined: 30 Dec 2007
Posts: 322



PostPosted: Sat Feb 09, 2008 8:52 pm    Post subject: Reply with quote

Unfortunately its not looking like the bulbs, as the back-light came on for a bit today.

*****, will remove it for a closer inspection.
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cytefx
Monza


Joined: 13 Sep 2007
Posts: 177
Location: Spain

1998 Porsche 993 Turbo

PostPosted: Sun Feb 17, 2008 9:29 am    Post subject: Reply with quote

Sometimes my fuel gauge, does not have light, a little flick and the light comes on, i think its probably a dry solder joint in there somewhere as its now at least 10 years old. Have not had the gauge out though to see if the bulbs are just loose.
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John

993 TT LHD, black on black, k24 (450bhp) factory upgrade, fabspeed muffler bypass, techart daytona wheels


944 Lux black on red (Sold)
318is Alpine white
 
  
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king_kenny
Silverstone


Joined: 14 Feb 2008
Posts: 109
Location: Stoke Poges


PostPosted: Mon Feb 18, 2008 1:55 pm    Post subject: Reply with quote

Hello,

I had the same problem. You will find what you are looking for on the forums.rennlist.com site.... Do a search on "OBC and transistor" in the 993 turbo and 993 forums.....basically what happens is a a transistor on the board fails and this causes the backlight issue....the issue only occurs when your headlights are on right?

You can replace the transistor with a 45p one from maplins....a lot cheaper than £611. I have attached a doc that shows what I cut and pasted from the rennlist site.

You need a decent soldering iron and fine solder.
cheers.
 
  
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993C2S
Zolder


Joined: 05 Aug 2005
Posts: 5996
Location: Berkshire

1997 Porsche 993 Carrera 2S

PostPosted: Mon Feb 18, 2008 5:50 pm    Post subject: Reply with quote

Nice one king k.

My OBC display failed, the OBC is permanently backlit normally but mine had no light. The display was still there, but very faint. I guess the resistor was the culprit.

Cheers again for the write up.

Moving this to 993 FAQs.
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c32amg
Trainee


Joined: 29 May 2007
Posts: 66
Location: spain


PostPosted: Sat Apr 12, 2008 10:19 pm    Post subject: Reply with quote

Hm, how interesting as mine failed last week. However my display is dark and hard to see even in daylight with the headlights off whereas previously it was visible in the day. Therefore is mine the same problem? I certainly won't be removing any parts myself so I assume this should be a simple thing for my local mechanics to diagnose & repair?
 
  
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king_kenny
Silverstone


Joined: 14 Feb 2008
Posts: 109
Location: Stoke Poges


PostPosted: Mon Apr 14, 2008 8:12 am    Post subject: Reply with quote

I would be very suprised if your mechanics will take the tach out and start soldering components.... an electronics repair shop would, the people that repair televisons and hifi could repair the tach for you..
 
  
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jamiesonmurray
Newbie


Joined: 13 Aug 2011
Posts: 13
Location: Moray, Scotland

2004 Porsche 997 Carrera 2S

PostPosted: Sun Aug 14, 2011 4:27 pm    Post subject: Reply with quote

hi there,
i have the same problem
which is the best method for removing the rev counter?
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1995 911 (993) Carrera Triptronic Cab
1969 VW GP mk1 Beach Buggy
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