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Heating Controls Meet Angry Child

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Offline Dazzler

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 :wts: Very clever and thanks heaps for sharing the photos.  :judges:
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Offline ibrokeit

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Yep, 2nd hand from a someone breaking down a car - got the full unit for £30 with another £12 for next day delivery.

And yes, just those 5 points holding the twiddly knob to the wider PCB, so hopefully can find somewhere to repair it and resolder those tracks. :)

Maybe pick up an electronics hobby magazine and/or search on google - they issue is many places that may do such fixes are usually small or home (and/or hobby) business... often with very little web presence... if you have a local electronics repair shop (rather than a brand service center) they might do it.   Trouble is they can be less common now - with many consumer items being more economical to replace than repair  :(  Which is why you get home/hobby businesses - full-time business with premises became nonviable... so operator goes finds other employment and operates repair business on the side; or a retiree sets up part time business to stay busy.

It shouldn't be too hard (assuming, if you need to, you can put wire on the 'knob' side of the PCB - i.e. enough clearance):
  • Some epoxy/two-part adhesive (possibly there is actual PCB glue) should work to glue the PCB together... trick will be making sure it won't 'eat' the PCB tracks (either now or over time)
  • As for the electronic side (assuming it isn't multi-layer - if it is the PCB is screwed - which I suspect it is NOT... it is likely only two sided) expose the copper (a few mm or so) of the track on each side of the break and solder a piece of wire to them to make electrical contact - if a suitably thick (not too thick) piece of wire is used it will provide some physical re-enforcement to the glued breaks
  • Of course you, assuming the adhesive isn't corrosive, you could then glue the wire down to the PCB as well, and bead it along the wire over the break, providing further physical strength
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Offline admoss1980

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That's a good idea, thanks.  I did some google-fu last night but in my area it was mostly industrial pcl type repairers, which I can't imagine will be cheap.  Apart from one independent with terrible reviews.

Anyway here's some pics of the actual PCB - I think you're spot on with your suggestions to repair as they is plenty of room.  Actually putting a brace between the two boards would stop it happening entirely really.

Twiddly knob


Top of PCB when removed from housing


Top side view of PCB - the white bits at the bottom are where the wiring harness clips in, the white at the top is the LCD screen


Side view (left hand side)


Zoomed in on the twiddle knob hole :faint:


Bottom view


To remove the PCB from the housing it is just a matter of popping all the clips :)


Offline admoss1980

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Oh meant to say too - there is a little black "slide catch" in the housing to align the twiddly knob into the correct position.


Offline Phil №❶

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I didn't know Doggie1 taught photography  :exclaim:
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Offline The Gonz

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I didn't know Doggie1 taught photography  :exclaim:
:rofl:

Like I said, I woudln't think twice about attacking it myself - go for it! :goodjob:
« Last Edit: March 08, 2016, 11:33:49 by The Gonz »
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Offline sundiz

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Pcb seems to be FR4. Fiberglass and epoxy resin. Almost any superglue should work. If you lost the broken pins you could just cut same size bits from some old pcb. If you have any old pc components (network cards, modems or any other PCI slot cards) you might be able to cut new contact pins from pci pins. They might close to the real size. Just use dremel or sharp cutting pliers.

Also the desing seems to be quite simple. At least on the other side. Some hobbyist would easily draw new pcb as all the componens seem to be passive. But as the pcb is in such a good shape, I think superglue is the easiest option.
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