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 Click image for larger version. Name: PXL_20240413_173359003s.jpg Views: 1 Size: 136.1 KB ID: 14931](/proxy.php?image=http%3A%2F%2Fwww.nsxcb.co.uk%2Fattachment.php%3Fattachmentid%3D14931%26d%3D1715525344&hash=28c7a3a1411d54e6185f1af359a4ca73)
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 Click image for larger version. Name: PXL_20240413_174444455~2s.jpg Views: 1 Size: 143.2 KB ID: 14933](/proxy.php?image=http%3A%2F%2Fwww.nsxcb.co.uk%2Fattachment.php%3Fattachmentid%3D14933%26d%3D1715525601&hash=44073a923766a61524c8f4b3afccb665)
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 Click image for larger version. Name: PXL_20240413_181430408s.jpg Views: 1 Size: 125.9 KB ID: 14934](/proxy.php?image=http%3A%2F%2Fwww.nsxcb.co.uk%2Fattachment.php%3Fattachmentid%3D14934%26d%3D1715525710&hash=9d5039a580d07d24500bf26179721352)
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 Click image for larger version. Name: PXL_20240413_190349591s.jpg Views: 1 Size: 109.3 KB ID: 14935](/proxy.php?image=http%3A%2F%2Fwww.nsxcb.co.uk%2Fattachment.php%3Fattachmentid%3D14935%26d%3D1715525924&hash=d19e7bd30213664d48fa3efe41dcdc77)
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 Click image for larger version. Name: PXL_20240414_123747654s.jpg Views: 0 Size: 93.7 KB ID: 14936](/proxy.php?image=http%3A%2F%2Fwww.nsxcb.co.uk%2Fattachment.php%3Fattachmentid%3D14936%26d%3D1715527260&hash=8dd945740abc9a8d1b21001cc7a0d8aa)
After removal of all capacitors the PCB was given a good scrub of the affected areas, down to bare copper, discovering multiple broken traces:
For the first time so far, the back side needed work, too
Nine bridges/repair wires had to be installed overall.
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.