AEG L12700VIT Door locks and display blank.

[Twoten]

I went to the above machine product code 914601902(00).
The display and option LED’s remain blank but once the on/off button is activated the door interlock energises.
I have tightened all the connectors between the fascia PCB and control board.
An insulation test shows the dryer element reads 38 M’ohm and the motor 32 M’ohm.
Has anyone come across this before??

[leavemetogetonwithit]

Re: AEG L12700VIT Door locks and display blank.

38 Megohm could be low enough to cause a problem. (In the service manual of a Zanussi I was reading the other day 40 Meg was specified as minimum acceptable for this component.) Try and see if the machine will operate with the dryer element disconnected. Ditto motor.
Mike.

[Twoten]

Re: AEG L12700VIT Door locks and display blank.

Thanks Mike,

I disconnected the motor and dryer element but still didn’t get a display. I suspect the earth fault could have damaged the PCB but unable to prove it.

[leavemetogetonwithit]

Re: AEG L12700VIT Door locks and display blank.

I don’t think that would have damaged the pcb. The whole reason machines refuse to work with these low insulation situations is because the “danger” is being sensed and the pcb is going into self protect mode. At least that is what I have understood from reading various contributions to these forums. It’s normally only catastrophic failures (esp. shorting locks) which get past the protection circuits.
Mike.

[Twoten]

Re: AEG L12700VIT Door locks and display blank.

leavemetogetonwithit wrote:The whole reason machines refuse to work with these low insulation situations is because the “danger” is being sensed and the PCB is going into self protect mode.
Mike.

Would this have prevented the option LED’s from lighting and energise the interlock?

[leavemetogetonwithit]

Re: AEG L12700VIT Door locks and display blank.

Twoten wrote:
Would this have prevented the option LED’s from lighting and energise the interlock?

Hmm. Not encountered that myself as far as I recall. Usually just get odd programme refusals/shutdowns. Does sound like there’s some sort of pcb/display pcb problem there. 😕
Mike.

[TheSpinDoctor]

Re: AEG L12700VIT Door locks and display blank.

Hi.

Two words.

Board F**ked!

Door lock may have caused it but theoretically can be caused by just about anything so your best bet is to take out the board & see where it is blown & trace the wiring back. Then you could also test the insulation of components as a belt & braces approach.

[Author]

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