> I have a 1990 Audi 100 2,3E with speedo problems that have been
> bugging me for some time. It started last summer when the speedo
> needle during drives from time to time stuck at about 80 km/h. It
> would then after some minutes usually fall to 0 km/h where it also
> could stick for some minutes until is went back to indicating the
> speed in a normal fashion. In outbursts of aggression and brute force
> it has been tried to knock on the top of the padding covering the
> instruments with an increasing amount of voilence. Some times this
> actually seemed to work because the speedo needle suddenly started
> indicating the correct speed again, but I don't know if the hammering
> incidents actually have caused the speedo to start working.

The slam on the binnacle is known as the "eyebrow dashboard salute".

This is a known problem caused by a pin soldered into the backplane
that's used to support the speedo cracking the solder that holds it to
the board.

The fix is a tiny touch with a soldering iron and it's documented on
Scott Mockry's site at http://www.sjmautotechnik.com

 

> I have a 1990 Audi 100 2,3E with speedo problems that have been
> bugging me for some time. It started last summer when the speedo
> needle during drives from time to time stuck at about 80 km/h. It
> would then after some minutes usually fall to 0 km/h where it also
> could stick for some minutes until is went back to indicating the
> speed in a normal fashion. In outbursts of aggression and brute force
> it has been tried to knock on the top of the padding covering the
> instruments with an increasing amount of voilence. Some times this
> actually seemed to work because the speedo needle suddenly started
> indicating the correct speed again, but I don't know if the hammering
> incidents actually have caused the speedo to start working.

The slam on the binnacle is known as the "eyebrow dashboard salute".

This is a known problem caused by a pin soldered into the backplane
that's used to support the speedo cracking the solder that holds it to
the board.

The fix is a tiny touch with a soldering iron and it's documented on
Scott Mockry's site at http://www.sjmautotechnik.com

 

> I have a 1990 Audi 100 2,3E with speedo problems that have been
> bugging me for some time. It started last summer when the speedo
> needle during drives from time to time stuck at about 80 km/h. It
> would then after some minutes usually fall to 0 km/h where it also
> could stick for some minutes until is went back to indicating the
> speed in a normal fashion. In outbursts of aggression and brute force
> it has been tried to knock on the top of the padding covering the
> instruments with an increasing amount of voilence. Some times this
> actually seemed to work because the speedo needle suddenly started
> indicating the correct speed again, but I don't know if the hammering
> incidents actually have caused the speedo to start working.

The slam on the binnacle is known as the "eyebrow dashboard salute".

This is a known problem caused by a pin soldered into the backplane
that's used to support the speedo cracking the solder that holds it to
the board.

The fix is a tiny touch with a soldering iron and it's documented on
Scott Mockry's site at http://www.sjmautotechnik.com

 

Phil Payne wrote:
>> I have a 1990 Audi 100 2,3E with speedo problems that have been
>> bugging me for some time. It started last summer when the speedo
>> needle during drives from time to time stuck at about 80 km/h. It
>> would then after some minutes usually fall to 0 km/h where it also
>> could stick for some minutes until is went back to indicating the
>> speed in a normal fashion. In outbursts of aggression and brute force
>> it has been tried to knock on the top of the padding covering the
>> instruments with an increasing amount of voilence. Some times this
>> actually seemed to work because the speedo needle suddenly started
>> indicating the correct speed again, but I don't know if the hammering
>> incidents actually have caused the speedo to start working.
>
> The slam on the binnacle is known as the "eyebrow dashboard salute".
>
> This is a known problem caused by a pin soldered into the backplane
> that's used to support the speedo cracking the solder that holds it to
> the board.
>
> The fix is a tiny touch with a soldering iron and it's documented on
> Scott Mockry's site at http://www.sjmautotechnik.com
>
That is a likely fix but the OP has already replaced the IC and the
problem was not resolved. Still, I suppose the both ICs could have had
the same problem and symptoms.

 

Phil Payne wrote:
>> I have a 1990 Audi 100 2,3E with speedo problems that have been
>> bugging me for some time. It started last summer when the speedo
>> needle during drives from time to time stuck at about 80 km/h. It
>> would then after some minutes usually fall to 0 km/h where it also
>> could stick for some minutes until is went back to indicating the
>> speed in a normal fashion. In outbursts of aggression and brute force
>> it has been tried to knock on the top of the padding covering the
>> instruments with an increasing amount of voilence. Some times this
>> actually seemed to work because the speedo needle suddenly started
>> indicating the correct speed again, but I don't know if the hammering
>> incidents actually have caused the speedo to start working.
>
> The slam on the binnacle is known as the "eyebrow dashboard salute".
>
> This is a known problem caused by a pin soldered into the backplane
> that's used to support the speedo cracking the solder that holds it to
> the board.
>
> The fix is a tiny touch with a soldering iron and it's documented on
> Scott Mockry's site at http://www.sjmautotechnik.com
>
That is a likely fix but the OP has already replaced the IC and the
problem was not resolved. Still, I suppose the both ICs could have had
the same problem and symptoms.

 

Phil Payne wrote:
>> I have a 1990 Audi 100 2,3E with speedo problems that have been
>> bugging me for some time. It started last summer when the speedo
>> needle during drives from time to time stuck at about 80 km/h. It
>> would then after some minutes usually fall to 0 km/h where it also
>> could stick for some minutes until is went back to indicating the
>> speed in a normal fashion. In outbursts of aggression and brute force
>> it has been tried to knock on the top of the padding covering the
>> instruments with an increasing amount of voilence. Some times this
>> actually seemed to work because the speedo needle suddenly started
>> indicating the correct speed again, but I don't know if the hammering
>> incidents actually have caused the speedo to start working.
>
> The slam on the binnacle is known as the "eyebrow dashboard salute".
>
> This is a known problem caused by a pin soldered into the backplane
> that's used to support the speedo cracking the solder that holds it to
> the board.
>
> The fix is a tiny touch with a soldering iron and it's documented on
> Scott Mockry's site at http://www.sjmautotechnik.com
>
That is a likely fix but the OP has already replaced the IC and the
problem was not resolved. Still, I suppose the both ICs could have had
the same problem and symptoms.

 

Phil Payne wrote:
>> I have a 1990 Audi 100 2,3E with speedo problems that have been
>> bugging me for some time. It started last summer when the speedo
>> needle during drives from time to time stuck at about 80 km/h. It
>> would then after some minutes usually fall to 0 km/h where it also
>> could stick for some minutes until is went back to indicating the
>> speed in a normal fashion. In outbursts of aggression and brute force
>> it has been tried to knock on the top of the padding covering the
>> instruments with an increasing amount of voilence. Some times this
>> actually seemed to work because the speedo needle suddenly started
>> indicating the correct speed again, but I don't know if the hammering
>> incidents actually have caused the speedo to start working.
>
> The slam on the binnacle is known as the "eyebrow dashboard salute".
>
> This is a known problem caused by a pin soldered into the backplane
> that's used to support the speedo cracking the solder that holds it to
> the board.
>
> The fix is a tiny touch with a soldering iron and it's documented on
> Scott Mockry's site at http://www.sjmautotechnik.com
>
That is a likely fix but the OP has already replaced the IC and the
problem was not resolved. Still, I suppose the both ICs could have had
the same problem and symptoms.