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Hi. My Bosch Classixx 1000 has been a solid performer for nearly 20 years. But, it's now developed a fault.

it's clear that it's a PSU problem on the main board caused by water ingress onto the board.  The PSU uses a TOP209P, a three terminal Off-line PWM switch. That may be faulty so I have ordered a new one. However, the more difficult issue is that the transformer in the circuit has an open circuit on one of the windings.   This component might be hard to repair (but not impossible). I wish I could source a new transformer, but what the chances of that I don't know.  There are markings on the transformer something like V0GT R1 or VO6T R1. I attach pictures.  Can this transformer be sourced?  To repair it, I would have to split the core part of the component in half, it looks glued together. I wonder if anyone has ever done that.  Thanks. Rich

 

 

BOSCH Washer Transformer mod.jpg

BOSCH WEasher PSU mod.jpg

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Book washing machine & appliance repairs Buy appliance spare parts

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Hello Richard. None of the parts for washing machine pcbs are available. It may be possible to buy equivalents from other sources if you know exactly what you are looking for but appliance engineers never normally repair them. A company called QER specialises in repairing appliance pcbs though. They may be able to help.


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Book appliance engineer | Buy your Spares (4Washerhelp)

Warning:  Read this before attempting any diy repairsNo representations or warranties are made (express or implied) as to the reliability, accuracy or completeness of advice. I can't be held liable for any loss arising directly or indirectly from the use of, or any action taken in reliance on, any information on this website, which is given free of charge and in good faith.

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I took the transformer apart but although I got the secondary turns (34) I failed to get the primary turns. I can figure/measure the wire gauges.  So, I'm stuck now. I will try to produce a suitable transformer/component using ready available products. The original transformer was made by VOGT and looks like it was core shape E 12.6/3.7. The original core part number might have been 254 04 325 10. The former or bobbin has "VOGT 32555" on it.  VOGT has been taken over by Sumida.  And perhaps the current equivalent part is "Flyback/Forward Converter 1-30 Watt / E.12.6 / 3.7."  Somehow I have got to work out the primary turns. I know the output voltage is 12V. I attach the schematic. Not sure if neutral is connected to ground in the washer. I'll have to check that out, but I doubt it is. Some tools at Power Integrations, who made TOP209P might be helpful.

BOSCH WFL2063GB 12  PSU.jpg

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I will contact QER  to see if they have managed to find a solution when T1 becomes faulty. But, I think they will want me to purchase a whole board (Siemens 5WK51307) rather than sell me just the transformer.

By the way, VD3 I think should have 120V beside it, not 120B) Volt in Russian = вольт

Actually, what QER will do is scrap the odd board and that will be how they fix a T1 problem. Feel pretty sure. They will give you about £5 I think for a board. :-)

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Hello Richard. You are one in a million perusing repairing a board in white goods. I agree QER is unlikely to sell such a small component, that's not their business model and unless they did it as a favour there's no money is supplying such a small part. But they used to offer to repair your board. It would probably make most sense to buy a reconditioned board from them with a guarantee.


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Warning:  Read this before attempting any diy repairsNo representations or warranties are made (express or implied) as to the reliability, accuracy or completeness of advice. I can't be held liable for any loss arising directly or indirectly from the use of, or any action taken in reliance on, any information on this website, which is given free of charge and in good faith.

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On 25/06/2017 at 10:42, Whitegoodshelp (Andy) said:

Hello Richard. You are one in a million perusing repairing a board in white goods. I agree QER is unlikely to sell such a small component, that's not their business model and unless they did it as a favour there's no money is supplying such a small part. But they used to offer to repair your board. It would probably make most sense to buy a reconditioned board from them with a guarantee.

Yep, I agree.  Save a lot of hassle just buying a new board. (Siemens 5WK51307)

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Okay. Instead of trying to wind a flyback transformer for the 12V SMPS that is on the PCB, I decided on a hack. I guess that the PSU was possibly supplying about 3W, 0r 500mA @ 12V. So,  I bought a small 12v @ 450mA SMPS from Ebay. It is small enough to be fitted within the PCB shrouding.  Now, I have the washer working again. However, it won't empty, but I think that is not a PCB problem. For the hack I removed all of the SMPS components except item S10 K75 varistor, thought I would just leave it in.  I attach a picture of the new SMPS PCB wired to the washer PCB.  I've not run this washer long, so the hack is not time proven as yet. Like I say, I've guessed the current.

Drain blockage unblocked washer now works. Assuming new SMPS holds up: Cost of hack - £5.01.

NB: IF ANYONE REPLICATES THIS HACK PLEASE NOTE YOU DO SO AT YOUR OWN RISK. I HAVE NOT CONDUCTED ANY SIGNIFICANT SAFETY INVESTIGATION AS TO THE SUITABILITY OF THE SMPS THAT I HAVE USED TO REPLACE THE ORIGINAL SMPS ON THE SIEMENS BOARD. THE ORIGINAL SMPS FLYBACK TRANSFORMER HAD FUNCTIONAL GALVANIC ISOLATION PROPERTIES WHICH WAS SUFFICIENT FOR THE CIRCUIT.  THE REPLACEMENT SMPS (WHICH IS A DIFFERENT CIRCUIT) THAT I HAVE USED HAS THE FOLLOWING SPECS WHICH SHOW RATHER IMPROVED ISOLATION (BETTER THAN FUNCTIONAL):

Galvanic isolation between input and output (> 1000VDC)
Input voltage 100-250V AC
Overload protection
Protection against short
Without the need of additional cooling

 

 

Bosch Classixx 1000 12v PSU Hack.JPG

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I have the same PCB which I believe has a similar fault.  A few weeks ago the LEDs went dim and now there is no LED life at all and the machine does not respond to anything. There is power coming in to the PCB and I noticed one component appears cracked/burned. You can see it next to the diodes and is probably a resistor.

Can you confirm which component it is and where I can source a replacement. See attached photo.

Thanks, AAK327093863_BoschClassixxPCBcrackedcomponent.thumb.JPG.42fd1778984539c20dc85573fe9fc25a.JPG

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Hi...Worn motor brushes wouldn't cause the power to go off and back on again. Worn brushes wouldn't allow the machine to complete the cycle as normal once the lights came back on either. I believe we are talking a power supply problem here. The power to the machine still is questionable as if it were an internal failing then the machine wouldn't resume the programme from where it left off. I don't doubt that after 4 yrs hard use the brushes must be getting pretty worn by now and at some stage worth checking but I don't think it the issue here.

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