this post was submitted on 10 Mar 2026
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A bug in the system. (infosec.pub)
submitted 1 week ago* (last edited 1 week ago) by tuff_wizard@aussie.zone to c/askelectronics@discuss.tchncs.de
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Merlin rollerdoor (Australian garage door brand) stopped working, when investigating I found a bug had shorted itself across an IC (labeled HVS004).

Luckily Merlin sells the whole replacement unit for only $449AUD. Before I pull the trigger on that I was wondering if anyone here could advise me on my chances of success if I just replaced the burnt bit.

I’m happy with larger electronics but I’m struggling to even identify any fuses on the board to check.

I’m also unable to find a replacement IC online as the code on it seems to be associated with some kind of blue LED. (I also don’t know for sure if the IC needs to be programmed or if it is just standard)

The back of the board is fine, just thru-hole solder connections.

here are some more photos(new link, should work now), hopefully in good quality.

Thanks in advance

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[–] partial_accumen@lemmy.world 2 points 1 week ago (1 children)

Much better pictures, thanks! I had suspected that both those ICs work together (and it looks like they do), but I couldn't find any part that matches it in any searches. It could be a specialized ASIC they made, or they could have bought proprietary marked ICs specifically to prevent the kind of repairs you're wanting to do.

Apologies I can't help further, you may be stuck buying a new board. Maybe keep the dead one around in case you need a replacement part in the future.

[–] tuff_wizard@aussie.zone 2 points 1 week ago* (last edited 1 week ago)

Ok, thanks. Considering no one here can identify the part and I don’t have the skills to work out exactly what it does, I’ll have to fork out the money. I suspect you are right and it’s just an off the shelf part with a custom code on it to trip up DIYers.

I know enough to know they’re making a fat profit off that module though.