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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[–] Notsosuperfloh@discuss.tchncs.de 2 points 1 week ago* (last edited 1 week ago)

I'd desolder the burnt ic and check if there is a short across the 16v caps. if there is no short power it and check if any of the 16v caps has any voltage on them. if theres no voltage on any of them also remove ic8. if you have a lab psu set it to 5v and current to 0.1 amp and inject it to the 16v caps and if you're lucky it powers up. if not slowly turn the voltage up until something happens. if it's working get a buck converter and solder the input to the 35v cap set it to to the same voltage as the psu and solder the output to one of the 16v caps.

id say 5v should do, as those caps go directly to ics. if both, ic7 and ic8 work independently from each other probably need to inject 5v to at least two of those 16v caps.