• Protip: Profile posts are public! Use Conversations to message other members privately. Everyone can see the content of a profile post.

CCU Service and Repair - No Operation

Joined
5 August 2014
Messages
219
Location
Germany
The cluster from a previous post came in a box with an additional, non-working CCU. It had been worked-on previously and some unknown clear coat was applied, covering a lot of capacitor liquid damage:

Click image for larger version. Name:    PXL_20240413_173359003s.jpg Views:    1 Size:    136.1 KB ID:    14931

After removal of all capacitors the PCB was given a good scrub of the affected areas, down to bare copper, discovering multiple broken traces:

Click image for larger version. Name:    PXL_20240413_174444455~2s.jpg Views:    1 Size:    143.2 KB ID:    14933

For the first time so far, the back side needed work, too

Click image for larger version. Name:    PXL_20240413_181430408s.jpg Views:    1 Size:    125.9 KB ID:    14934

Nine bridges/repair wires had to be installed overall.

Click image for larger version. Name:    PXL_20240413_190349591s.jpg Views:    1 Size:    109.3 KB ID:    14935

The first test run in the vehicle showed all functions and buttons to be operational but no display.
Replacement of the display with a known working one showed no improvement so the issue had to be with the CCU board.
After looking a bit harder, one remaining broken trace near C44 (documented in the blog) was the culprit.

Click image for larger version. Name:    PXL_20240414_123747654s.jpg Views:    0 Size:    93.7 KB ID:    14936
 
The cluster from a previous post came in a box with an additional, non-working CCU. It had been worked-on previously and some unknown clear coat was applied, covering a lot of capacitor liquid damage:
The home renovation maxim ' a new coat of paint fixes everything'. Or not :) .
 
Back
Top