[928uk] Digi dash problem

[Paul R Smith]

To help diagnose it, have you noticed if the clock illumination does the 
same as the dash.

Smiffy

On 05/02/2023 18:55, Mike Barnett via 928uk wrote:
> My 1990 S4 with digi dash has a problem with the dashboard illumination when the headlamps/ side lights are illuminated?
> When the head lamps/ side lamps aren’t on the light sensor in the digi dash illuminated the dash lights always.
> When driving at night the dash  lights come on and are less bright than during the day even at brightest setting on the rheostat.. however after a few minutes they suddenly go off except the digital elements of the dash which stay on..  after a few minutes they come back on again and so it repeats itself. It’s like there is a component that gets hot and turns off the circuit until it re cools?
>
> Oh and it’s NOT the rheostat… just fitted a brand new one from Porsche and made absolutely no difference.
>
> Can’t find anything on Rennslist apart from chatter about the variable rheostat ?
>
> Anyone had this before and solved it please?
>
> Many thanks
>
> Mike Barnett
> 1990 S4
>
> Sent from my iPhone