Electronics > Beginners

Motorcycle dash button failed

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Various:
Hi,

I am new to electronics, so please excuse any errors and feel free to point me in the right direction!

I have a 7 year old motorcycle with an electronic (LCD?) speedometer and buttons for switching between displays, but one button has stopped working. This is a known failure for this dash but it seems that no owners have been able to fix the problem and manufacturer replacements also fail. I am trying to understand the failure and then see whether a repair can be made, the part is very expensive to replace!

There is a theory among some owners that UK bikes suffer the failure more than American bikes, maybe the problem is associated with climate and therefore corrosion?
I have removed the dash from the bike and removed the workings from the outer casing for inspection.
I carried out a continuity test on the switch to see whether it works, and it seems OK.
I can see what looks like corrosion on the PCB trace, but I would like any feedback on whether this looks like the problem.

The PCB is printed with 'NS 06901'.

I will try to attach some photos to show you what I can see.

So...
Do you agree the problem seems to be corrosion of the PCB trace?
Is it realistic to make a repair to the trace?
To get access to the trace, I think I need to remove the PCD display, but this seems to mean removing the solder for all of the pins (see photo), am I correct?

Thanks

Matt

ataradov:
It is corrosion, and the repair is very possible. But it looks like the corrosion is around something that was not soldered before. Where is the actual button? Where do those holes go to?

Various:

--- Quote from: ataradov on November 10, 2019, 07:59:30 pm ---It is corrosion, and the repair is very possible. But it looks like the corrosion is around something that was not soldered before. Where is the actual button? Where do those holes go to?

--- End quote ---

That is good news!

Photos attached showing both sides of the PCB to help give an idea of what goes where.

Thanks

ataradov:
Ah, ok, this is (was) a plated through hole. This is a trivial repair for someone moderately skilled with a soldering iron.

All you need to do is scrape the green solder mask from the trace on one side and on the other side after the corroded part. Then run a wire though the hole and solder it on both sides.

Alternatively you may trace where the trace goes after it goes under the plastic. It is likely that it goes to the big black chip, so  it must jump sides one more time. If you trace where it appears on the same side as the button solder points, you can just solder the jumper wire there right from the button.

It is a good idea to clean the corrosion in either case.

Find literally any electronics repair shop and they will fix this in 10 minutes.

Various:
Thanks!

I will try to trace where it goes; the position of the corrosion makes it very awkward to reach because it is almost behind the plastic and I think that removing it would be quite difficult (for me!).

I will look for an electronic repair shop to make the repair, but I would like to be able to repair it myself too. I might go and practise the repair on an old PCB to see whether my skill is as high as 'moderate'.

Thanks again.

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