Hi fellow lifesavers.
I have a Samsung washer-dryer WD80N645OOW which died mid-cycle. No response to anything, completely dead.
Checked the socket, the plug fuse, all good. Took it out to examine the boards.
There is a relay clicking on the mainboard. Upon applying power, I can see a diode flashing on inverter board, after a while a diode on main board lits up for a split second, then I can hear a relay clicking. This repeats a few times, then everything dies completely.
I've been trying to examine the main board, but it's a bit difficult becuse it's covered in a glue/resin/silicone - which also makes it tricky to get to the other side of the board at all. I've checked some random diodes, caps and ics by just stabbing the DMM probes through, but it's not a reliable way of working at all.
I have close to 0 understanding how washing machines work in terms of electronics inside, what checks are being made and in what order etc. The fact that the boards are sank in resin makes it even worse.
I have found a reliable source from where I could get the mainboard, reasonably priced. My question is: what checka can I do to determine what's actually faulty? Does anyone know the behaviour of led diodes on healthy boards? I can imagine a faulty component switching off everything, so I'm afraid the main board may actually be healthy. Out of curiosity tried to plug in the machine without the display boards (the actual LCD board and the 'buttons' pcb), acting exactly the same. My understanding is the main relay should be switched on via pressing power button (as per service manual).
Some photos uploaded themselves twice and wouldn't get deleted when I tried. Sorry for this. Also there are some 'stab' marks visible in resin, in points where I tried to check for shorts etc. Please ignore those.
Also there's a service manual for similar models, on last pages there are pcb layouts with mainboard looking the same, might be of use.
Any help much appreciated. Cheers
I have a Samsung washer-dryer WD80N645OOW which died mid-cycle. No response to anything, completely dead.
Checked the socket, the plug fuse, all good. Took it out to examine the boards.
There is a relay clicking on the mainboard. Upon applying power, I can see a diode flashing on inverter board, after a while a diode on main board lits up for a split second, then I can hear a relay clicking. This repeats a few times, then everything dies completely.
I've been trying to examine the main board, but it's a bit difficult becuse it's covered in a glue/resin/silicone - which also makes it tricky to get to the other side of the board at all. I've checked some random diodes, caps and ics by just stabbing the DMM probes through, but it's not a reliable way of working at all.
I have close to 0 understanding how washing machines work in terms of electronics inside, what checks are being made and in what order etc. The fact that the boards are sank in resin makes it even worse.
I have found a reliable source from where I could get the mainboard, reasonably priced. My question is: what checka can I do to determine what's actually faulty? Does anyone know the behaviour of led diodes on healthy boards? I can imagine a faulty component switching off everything, so I'm afraid the main board may actually be healthy. Out of curiosity tried to plug in the machine without the display boards (the actual LCD board and the 'buttons' pcb), acting exactly the same. My understanding is the main relay should be switched on via pressing power button (as per service manual).
Some photos uploaded themselves twice and wouldn't get deleted when I tried. Sorry for this. Also there are some 'stab' marks visible in resin, in points where I tried to check for shorts etc. Please ignore those.
Also there's a service manual for similar models, on last pages there are pcb layouts with mainboard looking the same, might be of use.
Any help much appreciated. Cheers
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