Beko WTK72042W (7137241700) Washing Machine “Dead.”

[jontymox]

Good evening all,

I’m wondering if anyone can help with a fault on the above w/m?

Essentially, the machine will not power up.

Several weeks ago I ordered the suspect board from Beko, which was on back order, and unavailable anywhere…

I suspected the board, as power is getting to it, and confirmed that the main power connections (two grey wires) are receiving a good voltage from the suppressor to the board.

However, the board arrived recently, and I fitted it today… to find the fault remains…

I’ve tried disconnecting the heater, and motor connections, as I’ve had problems with such causing the above fault in the past.

Not sure where to concentrate/test next, and would appreciate any assistance.

Regards,

jonty

[electrofix]

ok first off
do you know for certain board is correct

if no

let me have serial no and the part no you fitted

Dave

[jontymox]

Good evening Dave,

The other serial number is: 21-108131-12

Part number: 2851545790 which I think is correct, looked the same, and fitted okay…

jonty

[electrofix]

well board is correct from my research

cant see any faults listed on tech site

its got to be something simple

if you have the old board try powering it up off the machine. its a single board so i cant see why it should not light up if its not faulty

you could have a new faulty board but proving that could be a problem. if it was me i would power the board and check for low voltage DC after the power chip

Dave

[jontymox]

Thanks Dave,

I’m stumped with this fault…

I’ve tried powering up the old board, which doesn’t light up, and I cannot conclusively say whether the voltage is low after the power chip.

I may have to try another board, although the replacement to many weeks to arrive from Beko…

jonty

[electrofix]

ok post or send me good pictures of both sides of the main circuit board

Dave

[jontymox]

Sorry Dave,

I’m struggling to upload/attach any photos from my camera at the moment…

There’s little of note on the original board – the machine is only just over two years old, with light use, and the board looks virtually brand new.

jonty

[electrofix]

but something must have made it stop working and components can fail at any time

what i am hoping is i can identify power supply components so you can test them

Dave

[jontymox]

Thanks again Dave,

I’ll have further attempts in forwarding board images.

jonty

[jontymox]

Agreed, there must be an underlying fault somewhere…

Hopefully images attached via a different arrangement.

[electrofix]

ok

ORANGE check this resistor its normally about 47 ohms or so but well under 100

RED there are a numner of Shotky diodes on the output. had a few go short circuit and cause power supplies to fail. very common fault in Beko washer dryer. if you think its short unsolder one leg to be certain as can somtimes give false readings in circuit

YELLOW look very carefully at this chip. is there a blemish on the packaging that looks like it may have failed. it can often be very small round full stop size shiny bit

Dave

[jontymox]

Good evening,

Thanks for your help Dave.

I’ve just tested the above.

The orange arrowed resistor gives an Ohms reading of: 98.5 Ohms

The red arrowed diode gives a reading of: 1.95KOhms

The microchip appears to be perfect.

So, wondering if the orange arrowed resistor is faulty, and what it relates to?

Thanks again,

jonty

[electrofix]

the orange resistor act as a current limiter on switch on and a fuse if something fails

100 ohm means its fine

red diode should have different readings if you reverse your leads. most meters have a diode test setting

look for similar diodes and measure them as well. cant see that end of the board properly so can give more info

if all ok you can try some live tests if you want to

look at the 3 capacitors and look at the voltage ratings. one will have 400v which should read 300v or so when energised

the other 2 will prob be low voltage poss 12 v or 5 V

all the voltages have to be there for the board to function

Dave

[baron]

jontymox wrote:
I suspected the board, as power is getting to it, and confirmed that the main power connections (two grey wires) are receiving a good voltage from the suppressor to the board.

However, the board arrived recently, and I fitted it today… to find the fault remains…

Regards,

jonty

Lets try again,

So I understand that even the new board is giving the same problem: “Does not light up“
From this point, you have to connect on the bench without any peripherals (one different power cable on the back of selector) and give a step rotation to selector (select any position of him apart ON/OFF).
Board should light up with an error….
I have doubt that new module has the same defect…

Adrian

[jontymox]

I’ve finally had time and found the reason the original board isn’t powering up.

The contacts in the main selector switch are burned out.

However, not on the replacement board, which I’ve damaged to inspect. (switch housing)

My customer decided to purchase a new machine, so I’ll probably have to admit defeat on this one.

I suspect a short circuit from the heater, or motor for example, may be the underlying cause, and has immediately damaged something in the new board when fitted…

jonty

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