Instrument Cluster power down

[jcwhy]

Vehicle = '90 535i manual

Instrument cluster intermittently powers down while driving. Does not recover after a good whack but can cause failure by doing the same. Did some reading and found defective capacitors might be a cause so removed the cluster and extracted the PCB board. This is a delicate/expensive component so I don't want to mess it up. PCB looks good with no sign of failure. Conformal coating looks in good shape.

There are 4 (Frako) caps - see pics. 1000uF is glued down.

Is it recommended to replacing these? What are other failure mechanisms?

Markings on these vintage radial caps indicates 2x 22uF/40V, 1x 220uF/15V, and 1000uF/15V. Necessary to replace all? No information about lead spacing, ESR, etc. Purchasing from Digikey is a shot-in-the-dark.

All feedback appreciated - thanks all

~jeff

image1.jpegimage2.jpegimage3.jpeg

[shogun]

I once had a cluster when the pins which connect to the plugs in the rear needed re-soldering, see pics here
http://www.bimmerboard.com/members/h...terrepair1.JPG
http://www.bimmerboard.com/members/h...terrepair3.JPG
http://www.bimmerboard.com/members/h...terrepair4.JPG

caps replacement http://www.bmwe34.net/E34main/Mainte...Capacitors.htm
caps data I collected here http://www.bimmerboard.com/forums/posts/792184

[jcwhy]

Ordered replacement capacitors from Digikey. Removing the old caps was easy enough with solder wick. Hopefully this does it.

Thanks shogun.

~j