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Speedometer Woes
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Trainman   
Tue Oct 10 2017, 09:16am

Joined: Apr 12 2010
Member No: #86
Location: Penwortham
 The speedo on my C6 has decided to spit it's dummy, I sent it down to STSTech in Somerset and Simon has discovered that the actual VDU (Visual Display Unit) has failed.

So I'm after another one.............. It doesn't matter if it's working or not, nor does it matter about the mileage as it's going to be broken for the parts.......

If anybody has one or knows of one I'd greatly appreciate any pointers......
robingc33   
Tue Oct 10 2017, 07:28pm
Joined: Aug 25 2015
Member No: #2303
Location: NW Essex
 I still have my original dead display having eventually bitten the bullet and got a new one. It had chip(s) replaced around the regulator circuit more than once. I've no idea if the display itself still works tho it did (briefly) after each repair attempt.
We can discuss further by PM if it's of interest?
Robin
Trainman   
Tue Oct 10 2017, 07:48pm

Joined: Apr 12 2010
Member No: #86
Location: Penwortham
 PM sent
Trainman   
Sun Oct 15 2017, 08:41am

Joined: Apr 12 2010
Member No: #86
Location: Penwortham
 I now have another speedo in my hand, which will be sent to STSTech on Monday. so hopefully he can repair mine.
Paulius   
Wed Oct 25 2017, 01:49pm
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
 Has anyone got an idea on what the actual failing partis? My display failed to turn on the other day, and though it is fine now, I would very much like to replace that transistor/coil/whatever before it fails competely and causes more damage.
Trainman   
Wed Oct 25 2017, 10:36pm

Joined: Apr 12 2010
Member No: #86
Location: Penwortham
 Despite managing to get my hands on another speedo, it was to say the least "beyond repair" so I'm back to begging for another faulty one.........
vaho   
Thu Oct 26 2017, 06:35am
Joined: Jun 25 2015
Member No: #2228
Location: Tallinn
 Hi Paulius

The parts that are failing are mostly the transistors and SI4431 P-Channel Mosfet:




The transistors can be replaced with BSP 51 ones and the Mosfet with IRL 3803S. Information from the germans and since I have very little knowledge in this field I have no idea from where to get the parts.
vaho   
Thu Oct 26 2017, 08:30am
Joined: Jun 25 2015
Member No: #2228
Location: Tallinn
 A bit more information - the eight legged transistor is:
SI4431BDY-E3 Transistor P-Kanal-MOSFET 30V 7,5A 2,5W SO8
Apparently gets very hot and may prematurely fail hence the replacement with more powerful one as described in my previous post.

The other two transistors are:
BSP51 Transistor npn 60V 1,0A 1,5W SOT223

Use the soldering tin L-Sn63PbAg.
Do not know what any of these numbers or letters mean..:-)

A better picture after the replacement of two transistors:
C6Dave   
Thu Oct 26 2017, 11:09am

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
vaho wrote ...

Do not know what any of these numbers or letters mean..:-)


Googling the number gets some results - Click Here -

No idea what they mean either though
Website
Trainman   
Thu Oct 26 2017, 03:58pm

Joined: Apr 12 2010
Member No: #86
Location: Penwortham
 Time to post some pictures:

The top two pictures show what the back of the speedometer should look like.....










The bottom two pictures show the "repair" that had been carried out by somebody, prior to Robin acquiring his car.






MGmike   
Thu Oct 26 2017, 04:52pm
Joined: May 21 2017
Member No: #3151
Location: South Queensferry
" The bottom two pictures show the "repair" that had been carried out by somebody, prior to Robin acquiring his car. "


Nasty! but what's a boy to do if the tracks are burnt out?
It's not uncommon to replace damaged tracks with wire but whats the vero board strip there for?
Trainman   
Thu Oct 26 2017, 05:00pm

Joined: Apr 12 2010
Member No: #86
Location: Penwortham
MGmike wrote ...


Nasty! but what's a boy to do if the tracks are burnt out?
It's not uncommon to replace damaged tracks with wire but whats the vero board strip there for?


No idea...........

I'm not that technically minded
Paulius   
Fri Oct 27 2017, 07:41am
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
vaho wrote ...

Hi Paulius

The parts that are failing are mostly the transistors and SI4431 P-Channel Mosfet:





The transistors can be replaced with BSP 51 ones and the Mosfet with IRL 3803S. Information from the germans and since I have very little knowledge in this field I have no idea from where to get the parts.


I tried googling that 8 legged transistor and it shows parts which are 3 (and a half?) legged (one big contact on one side, and three on the other, one beig "cut short"). Is that ok?
Other than that, I'm looking to just order these parts and resoldering them myself as a preventive measure. Should be a lot cheaper than sending it in for a professional repair.
vaho   
Fri Oct 27 2017, 09:11am
Joined: Jun 25 2015
Member No: #2228
Location: Tallinn
 This one is available:

- Click Here -
Paulius   
Fri Oct 27 2017, 10:07am
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
vaho wrote ...

This one is available:

- Click Here -

Yes, but it would be nice to have the more powerful version so that it would not get as hot.
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