Zanussi ZWD14581W1 PCB replaced but still not quite there

[Seret]

Hi,
I’ve just had the PCB die in my Zanussi ZWD14581W1 washer/dryer. It was definitely the PCB, there’s a burned out component on the old one I removed.
I ordered the replacement PCB from Zanussi direct and have just fitted it. Happy days, the machine now powers up. However, when trying to start a wash cycle it just stops after a few seconds with the start button flashing.
I’ve double-checked all the connections on the board and everything is plugged in properly. Does the PCB need any kind of config? I feel like I’m 99{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of the way here and that I’m just missing something.

[electrofix]

what part number did you fit ?
and what is your full pnc number ?

want to check you have correct part also is the start button flashing a sequence ?

Dave

[Seret]

I fitted this part: https://shop.zanussi.co.uk/laundry/washing-machines/electronics/configured-electronic-ewm-2500/p/973914604322029
To a ZWD14581W1 (914604322 02), this was the part the Zanussi site said was compatible.

The start button isn’t flashing any code and there are no errors on the panel.

[electrofix]

yes its the correct part but did you find out why the old one burnt out ?

Dave

[Seret]

No, but this is the damage on the board if it helps:

[electrofix]

trying to read nombers off blown chip

what is the connector number in the fore ground

Dave

[Seret]

That’s J1 on the left and J2 on the right. The chip that’s blown up is TYACS2

The damage to the frame of the connector was me when I was dismantling it, they were on effing tight and since I was chucking the board I didn’t bother being too gentle with it. It’s possible I broke a connection in the plug while doing this perhaps, I may bell the wires out if I can find a circuit diagram.

[electrofix]

does the door lock

think that chip may feed it ?

the key here is that chip but what worries me is there is a faulty component it feeds that could well blow your new board

that chip is an electronic switch we need to find out what it feeds. if you know what connector it feeds out on i should be able to find out where it goes

Dave

[Seret]

electrofix wrote:does the door lock

Yup.

See here for a short video of how it’s behaving: https://youtu.be/1XEqCbGJhVU

Yes, I was worried that something had blown the chip on that board, but the new one is in there and there’s no smoke coming out of it yet…

Assuming that the connectors adjacent to that chip are related to it, yes the wires do go down to the door interlock.

Appreciate your help on this, btw!

Edit:

Just pulled the door lock out (it felt slightly warm tbh?) and the plug on it is showing some scorching. I thought I might have found a smoking gun, but the wires back to the board are still only showing 0.1 to 0.2 ohms and the door does lock.

[electrofix]

long shot have you checked the motor?

dave

[Seret]

electrofix wrote:long shot have you checked the motor?

dave

Getting about 23ohms through the motor and no short to earth.

I have noticed something though: the Electrolux part number on the PCB Zanussi supplied isn’t an exact match for the one I removed:
​​​​​​
Out
In

It’s physically the same and shows the same “boot ver” on the software side but could the different part number mean they’ve actually sold me one not programmed correctly for this machine? Their site assured me it was the right part…

[electrofix]

check part number earlier and was correct programmed unit. assume you checked the part no on the box

as for motor assume you checked

Armature
field coil
Tachometer

you need readings through all of them
some field coils have 3 tappings

Dave

[Author]

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