Washing machine dead with no power

Thread Starter

jaisunny

Joined Mar 20, 2019
11
This machine is in the UK. The fuse is often in the power plug.
Correct.

Is there any sign of life on the control display?
None at all. I tried numerous attempts to hold a couple buttons down to pull up some error codes, but nothing.

The left hand side of the larger board looks like a switch mode power supply. I am guessing that the two pin connector in the bottom left hand corner is the AC input to the board. Can you confirm that this is the case ? (Your pictures are not sharp enough to read all the labels.)
If my guess is correct can you test for continuity between the live and neutral on the mains plug to the two pins on the connector that plugs into this connector ? (This is to find out if this part of the board has power applied to it all of the time without you having to take readings of high voltages.)
I suspect that the small board with the large heat sink could be the power supply for the control electronics. What is under the large heat sink on this board ? (It looks too large to be for a linear regulator considering the size of the transformer.) Pictures of the etch side of the boards would also be helpful.

Les.
I'll do some more pics, but I came across someone with the exact same machine as mine online today and he fixed his by replacing the exact same diode thats gone in mine. But, he replaced the 100v 1a diode with a 100v 2a and it fixed it for him. Of course, we both could have different issues, and I could be unlucky and had other parts go bad with the diode, however, i've ordered up the diode and its coming tomorrow. I will replace it and see. I will report back if it doesn't solve the issue.
 

wayneh

Joined Sep 9, 2010
18,115
... I came across someone with the exact same machine as mine online today and he fixed his by replacing the exact same diode thats gone in mine. But, he replaced the 100v 1a diode with a 100v 2a and it fixed it for him.
That’s a very encouraging sign!
 
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Thread Starter

jaisunny

Joined Mar 20, 2019
11
So, diodes arrived today, tested one before mounting and tested all good.

Mounted onto board, and tested again and oddly im getting readings from both directions.

0.236 one way
2.819 the other direction.
 

SLK001

Joined Nov 29, 2011
1,549
So, diodes arrived today, tested one before mounting and tested all good.

Mounted onto board, and tested again and oddly im getting readings from both directions.

0.236 one way
2.819 the other direction.
Why is that odd? You are testing in-circuit, which means that other components are in the loop.
 

wayneh

Joined Sep 9, 2010
18,115
So, diodes arrived today, tested one before mounting and tested all good.

Mounted onto board, and tested again and oddly im getting readings from both directions.

0.236 one way
2.819 the other direction.
I agree with @SLK001, you can't always test a diode in-circuit.

Looking forward to a success soon!
 

Thread Starter

jaisunny

Joined Mar 20, 2019
11
Why is that odd? You are testing in-circuit, which means that other components are in the loop.
Because the remaining diodes close by only read one way.

No problem, I understand that. Let me connect it all back together and test. If you don't hear from me in 1 hour then I have been electrocuted.:D
 

Thread Starter

jaisunny

Joined Mar 20, 2019
11
Ok guys, machine now turns on...Hurray.

New problem though..
LCD screen isn't displaying the numbering correctly. Was fine before it broke down.
 

pfofit

Joined Nov 29, 2006
57
Been a week, but for fun there is a fuse in the rectangular block I've highlighted in the pic below.
This board appears to be a motor control board from the heat sink and pins coming from it.

Board1.jpg
 

pfofit

Joined Nov 29, 2006
57
New problem though..
LCD screen isn't displaying the numbering correctly. Was fine before it broke down.
Try resetting connector plugs to display board, both ends and check back of board for crack solder joints on that cable.
Make sure no pins got bent over or pushed out of connector plug .
 
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