Crispy
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Madrigal music is playing - Voices can faintly be heard, "Please leave this patient undisturbed."
Posts: 776
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Post by Crispy on Mar 3, 2021 19:08:30 GMT
Frans, could you please help me with a problem I have with my wine cooler. It stopped working last night and I decided to investigate today. In the first picture below you can see that obviously something had blown. Even though something had blown the fused spur was OK so was the Fuse in the Plug and also the fuse on the circuit board, I found this very strange?
After I cleaned the board up you can see where the PCB track has been ripped in two
On the topside of the board sits this subminature Power relay which I guess is the problem?
There is also a diode right next to it so I thought I would check that and it seems OK. How do I check the relay to see if it is the problem? The pin layout below
I have been looking for a replacement should I need one and come up against a brick wall - do you know of a good alternative should I need one? Thanks Frans
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solderdude
Administrator
measureutternutter
Posts: 4,882
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Post by solderdude on Mar 3, 2021 22:18:13 GMT
The broken circuit is just a relay contact between the load (compressor or whatever) and mains. When that circuit 'flashed' the way it did it points toward a shortcircuit in the circuit it switches. It could be a motor or an overvoltage protection or even a capacitor in parallel to the load.
Maybe the relay still works. You can put 12V DC on the coil and then the contacts should close. Also possible the contacts welded and are always 'on' or you can hear the relay click but no contact. You can 'bridge' the part where the trace was with a 6A slow blow fuse.
As said... there must be an issue with the circuit the relay has to switch.
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Crispy
very active
Madrigal music is playing - Voices can faintly be heard, "Please leave this patient undisturbed."
Posts: 776
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Post by Crispy on Mar 4, 2021 16:44:31 GMT
The broken circuit is just a relay contact between the load (compressor or whatever) and mains. When that circuit 'flashed' the way it did it points toward a shortcircuit in the circuit it switches. It could be a motor or an overvoltage protection or even a capacitor in parallel to the load. Maybe the relay still works. You can put 12V DC on the coil and then the contacts should close. Also possible the contacts welded and are always 'on' or you can hear the relay click but no contact. You can 'bridge' the part where the trace was with a 6A slow blow fuse. As said... there must be an issue with the circuit the relay has to switch. Thanks Frans, great help as usual. I checked the relay and there was nothing wrong with it, I mended the track with a 5A slow blow fuse and resoldered a few suspect solder joints. Visually checked the board over and decided it was OK? Before fitting the board I checked the compressor overload protector & starter - both had blown. I then checked the compressor itself which also turned out to be faulty. So it looks like the compressor failed which in turn blew the sarter, overload protector and then the PCB board. It still amazes me why none of the fuses did not blow? I looked for a replacement compressor and decided it is cheaper to buy a new cooler Thanks again - your help is very much appreciated.
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