Beko pcb repair

[kaibart]

Hi just wondering what compenent has blown on this pcb and where i can purchase 1 from

[kaibart]

Photo of pcb

[electrofix]

did you take a pic slightly more left. want to see if there is anything printed on the board and poss where it connects from

have you got model of machine ?

Dave

[kaibart]

Lwf27441w 7162741200 serial 17-101003-07

[electrofix]

is this writting here, if yes what does it say ?

Dave

[Hollytree_Technical]

My suspicion based on its location, orientation and the fact that the part number on the label comes back as a motor control PCB is that it may be the remains of a small fuse possibly in line to the transformer.
Like Dave said the designator next to it should confirm it but if not then a photo of the rear of the board would help with tracing it out.
If it is as I suspect a fuse then I would suggest checking the motor output semiconductors for shorts as they don’t blow like that for no reason.

Jem

[electrofix]

agree there thats a big bang so other things have blown as well

Dave

[kaibart]

Here is a photo of the other side of the pcb and the part that is blown. 1 other question how do you test the diode on the beko w/d pcb

[electrofix]

put a multimeter on diode test

put the leads on the diode one each end note reading if any
reverse leads
you should get a reading one way but not the other.

the blown board, by the look of the tracks I agree with jem, looks like it may be a fuse

Dave

[kaibart]

So new pcb then is it i cant see anything else wrong any burn marks

[electrofix]

what worries me a little is what that fuse supplies

you could try a trick

find a 240 lampholder and an old style 100W lamp

put 2 wires on the lampholder and solder one wire to either side of where the fuse came out

the lamp is now a sort of fuse. if you turn on and the lamp goes very bright then you know it would have gone bang

what am interested in is does this fuse also serve the motor. if the answer to this is yes then fitting a new board will just make it pop again

cant trace from the photos where the live goes to when its left the fuse

Dave

[Hollytree_Technical]

It looks like the fuse goes to one of the switch contacts on the relay, my guess is that the other side of those switch contacts go to a bridge rectifier and then the motor output drivers (the drivers will be mounted on the heat sink, possibly also so will be the bridge rectifier).
The relay will probably be being used to allow it to switch off most of the circuit board when it is in standby.
I would suggest that at least some of the output drivers will be dead and the bridge rectifier. You may be lucky and find that it had just been heavily overloaded or a voltage spike etc took it out but I would check the motor carefully before you think about reusing it.

Jem

[kaibart]

So update on this fitted a motor pcb and all is working well can only assume it was overloading

[Author]

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