Audi TT 2000 keeps resseting speed and rpm

[honingkoning]

Guys did someone encounter this before,

The speed and rpm indicators ressets,
already resoldered components on the back of the dash.
I dont think the problem is in the 908 mcu.
I repaired several TT/A3 dashes with bad temp and fuel indicators and this was caused by the 908 CPU, this dash only have problems with speed and rpm indicators.

Maybe someone knows the functions of the 4 pins that drives the steppermotor.

I think There is a powerloss on both indicators.

Wbr Adam.

[honingkoning]

Any of you guys?

[sepistar]

try to heat a little bit the processor.
sometimes it helps!if after heating works,then you have to change the mcu,because the error are mcu internal and can not be repair.
br.