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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

A/C CCU Board service 01

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As our NSX getting older and older, any mechanical and electrical services are getting more of restoration than a simple general maintenance.

Currently, inspecting one engine that was originally started as a simple spark plug inspection.

Now it turned into months of Eng services after finding lots of mistakes nearly damaging the cam journals.

And after the big challenge with the audio head unit, this time, it was the turn of the CCU board.

Already refurbished 100s of circuit boards and never failed and not a single one returned for another refurbishment but on this occasion, I nearly gave up.

Thank you to my friend BrianK at NSX Prime.

Exchanged several communications in the past but on this occasion, his advice and his past experiences were the only thing that kept my motivation for tackling this problematic circuit board.

At the end, it was better to find another CCU board and refurbish it rather than trying to fix this one but it allowed me learning several new things.

When the owner contacted me, he told me that someone already tried repairing this CCU board but failed to recover the power.

Already dealt with so many circuit boards that were previously serviced by someone else so nothing new.

In fact, this one was not too bad compared to other ones.

Quite often, people doesn't know what to look for so many boards end up with more damages than the actual refurbishment.

When I received the board, first thing I noticed was so many components were sharply bent or squashed.

Looked as if someone placed something heavy or just didn't handle it with care.

Later, this was one of the main cause for the complication of the service because several components had partially broken lead that could be only detected if the actual components were removed or wiggled.

In this photo, Q4 and R8 were actually broken but when tested on the board, they were fine.

After you wiggled or removed them, only then you would notice the cracked lead.

Some sort of grease like substance on the connector terminal.

Don't know whether it's a contact cleaner or not so gave a good cleaning.

Severe contamination but nothing new and just takes lots of time, well, that was the case at this stage….


  1. Heineken's Avatar
    It's an interesting acid damage pattern - just as if the acid had crept along large areas of the board not just near the capacitors. Maybe it was stored upright for some time?