Author Topic: V10 PCB Sealant? (Read 1620 times)

macman · « **on:** March 02, 2023, 11:01:56 am »

I'e done quite a few V10/V11 trigger replacements recently: these are 3 or 4 year old machines where the triggers are now failing with monotonous regularity.
But I had a V10 in this week that was different: when I took the white plastic cover off the PCB, I found that the whole board was covered with a sort of white silicone sealant, which I'd need to try to peel off in order to undo the trigger wiring. Has anyone else come across this? Are Dyson now doing this to stop people doing their own unofficial trigger replacements?
This particular model was apparently an official Dyson refurb from their ebay shop, so maybe it's a mod that they only do on refurbs? As the PCB already has a perfectly adequate dust-proof cover and seal, I can't see that this is anything other than an attempt at a security seal?
In the event, I didn't try to remove it, as the machine needed a new bin and head and the owner decided to replace rather than repair, so i don't know if it would have been possible to remove the silicone seal or not?

__russ__ · « **Reply #1 on:** March 02, 2023, 08:17:19 pm »

I've seen a few now with clear silicone. Was a bit surprised with the first one - seen a few now so just pick enough off to get to the terminals

MVacs · « **Reply #2 on:** March 05, 2023, 06:53:55 pm »

That's interesting. It's not something we've come across yet that I know of. I assume its to keep water off the board if people suck up water?

macman · « **Reply #3 on:** March 12, 2023, 04:52:47 pm »

You may well be correct about it being to keep moisture out. Coincidentally, the very next V11 I had with trigger failure did NOT have this silicon sealant, and had corrosion visible on the trigger assembly wiring terminals. When i bent the terminals back to release the wiring, one of them snapped clean off. So I managed to find a used trigger assembly with a broken trigger. Swapped out the broken trigger for one of MV's replacement ones, and job done. Or so I thought: it ran the motor, but the speed control was locked into Medium and couldn't be altered. I suspect that the board was damaged by water getting on it and causing long-term damage.
By another amazing coincidence, I'd just been given a complete motor and cyclone unit by someone who'd got it as a warranty replacement for a broken trigger, so I had to swap out the trigger yet again to finally get a fully working V11. So far, I've only come across this sealant on one machine.
Did Dyson ever modify the trigger design before the V10/V11 went out of production?