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Speedometer burned traces on pcb 900

posted by  gerrit1974 on  Mon Feb 3 00:08 CST 2014
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last visit: Thu Feb 6 08:08 CST 2014
[RELATED]

Hi there,

Stephen suggested that I should post my observation/question here.

Background:
I'm a german based volvo enthusiast, softwaredeveloper and owner of a 1994 945. Some time ago, my instrument cluster developed problems and I tried to fix them myself. Since I was getting tired of monting the unit in the car only to find out it was still broken and the uncertanty it might be something else wrong (broken cabels, faulty speedometer signal etc.)I build my self a testing device (see attached photo). I then started to fix some clusters for frinds and club-members.

Problem:
I recently got the x cluster-instrument where I noticed burned pcb-traces (see attached photo). In most cases I was be able to fix the speedometer by soldering wire where the traces used to be. How ever, in some cases it didn't solve the problem.
I wonder why this happens and I can't figure it out. I would appreciate any help/suggestions.

Best
Gerrit

Burned traces


Simulator





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