- This topic has 20 replies, 6 voices, and was last updated 14 years, 9 months ago by
.
-
Posts
-
Just done a labour of love relay replacement on this module and was popping it back in its plastic holder when I noticed this:
I am not sure but I think the Bosch no. for this pcb would be 1802113. Looks like this:
but without the smoke damage 🙂 . Hmm. that’s got cropped somehow. 6 buttons anyway. Last digits on chip are (2?)02N & 6 on top line.
So, if anybody has a similar module hanging around which they could have a dekko at and get me the numbers off that part, I’d be well pleased. My guess is it’s same across several modules.
PCB label says Siemens 5WK57751.
Mike.Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
have got a bosch dishwasher here will strip prog out and have a look if you have not had a reply by tomorrow
from look of chip and wiring i would guess switch mode chip
somthing like TNY253 /4 /5 etc
they are used on a lot of pcb’s if i am right there will be a small transformer on the other side of the board. you will need to have a close at other components this is quite a bang. get a jewelers eyeglass and have a good look
DaveRe: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
electrofix wrote:you will need to have a close at other components this is quite a bang.
Too true! Water point device or dispenser solenoid methinks. 🙁
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
Yes, it must have gone with quite a pop. Here’s how it looked before my repair:
and after:
Here’s what’s on the other side of the interface board (which is a bit worrying!):
One digit on the number in the centre of that big chip is discoloured. I just hope that isn’t an omen. Other than that there’s no other sign of further damage.
Thanks for the pointers.
Is it possible this was two faults unrelated to each other? I’m wondering if the thing would still work, just not on all programmes? Not sure which tactile switch does what.
Mike.Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
checked the dishwasher i have different board
by the look of the damage is there any way this has got wet cant see a simple relay failure causing such damage
will keep an eye out but dont know how long it will be before i get the same board
i would look at all components directly connected to blown ic you need to work out current path as there must be more broken components even if they are just resistors
Dave
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
Thankyou for checking that Dave.
I had thought even quite different boards would use same components. Had a look last night and could only see two of the chip’s legs being used ( 😕 ) but will check again later. Might as well cut the chip out anyway, make it easier to see. From looking at pics of DWF30 from a Google images search I think that button is something like “pre-rinse” which is why I’m wondering whether the thing would work at least partially anyway. Will also check for water signs.
Mike.Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
qer list a repair see ebay listing
http://www.ebay.co.uk/itm/REPAIR-pcb-mo … 1e59f7528e
might be worth a ring and see if they will do it if exchange ber
Dave
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
I thought of giving them a ring to ask if they could have a look at the chip on one of their near-same modules that they keep in stock. They don’t list this one as stock and my gut feeling is they would call it BER on sight! Maybe I’ll ring them Monday and e-mail the pics if they sound friendly. Not used their service for years.
Having cut the chip out I can now see a bit better what’s going on underneath it. Looks a bit scary really. Beginning to think of throwing in the towel 😳 . Gonna have to file down my soldering iron tip a bit if I go ahead 😆 .
Mike.Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
mike, you got way too much time on your hands, one look at that board and I would suggest to the customer its BER, bound to be something caused it to go pop and IME virtualy impossible to find the problem without several expensive blow ups!
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
….ah but fair play to Mike, whilst he may have dedicated a lot of his free time and effort into this, we may all benefit from he efforts in the end. The guys are queuing up to go on Ken’s electronics course and its precisely this sort of stuff we need to learn.
After almost 40 years of wielding a soldering iron in my toolbox, I’ve mastered the art of solder blobbing the odd dry joint. Never yet had the courage to pop into Maplins and buy a relay. Have no clue how a triac works or could recognise a chip from a varistor. Just reading this thread alone, and eyeing up the photos that come with it, I’m learning new tricks just sitting here…..fantastic! 🙂
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
You’re both right. My time will be largely unpaid. But it’s a lot more fun than running round all day emptying filters, and the learning experience is hopefully going to come in handy in the long term. I have got too much time, and I think this is not too bad a way to spend it.
Meanwhile my feelers are busily out seeking a cheap s/h board and I think I’ve got a bite!
Mike.Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
its worth learning
just had a bosch auto that blew the pump
also blew 1 triac 1 resistor 1 transistor
had to order 250 resistors and 50 transistors still cost under a tenner so i have a few left
secondhand triac off a hotpoint board and its a goerresult i can charge for repairing the board and the pump+ fitting instead of scrapping it Ber
Dave
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
were turning into the new-wave of the masters of the shantytowns thanks to mike 😀
Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
dont get me wrong, having come into this trade from an electronics background, all be it way back in the days of BT139 triacs or even massive thyristors paired with a massive diode, I am well versed in board repairs and will take on one if it looks like a simple failure not caused by by an unknown failure elsewhere (e.g relays, burnt out resistors etc)and I recently spent half a day (Sunday!) changing relays on a miele td heater relay board, (Double sided track is a nightmare).
But from a business point of view, how can you charge for all the time and hassle and in that respect cleaning filters all day makes much more sense. Electronics as a hobby is fine and I must admit I found the recent Miele power board fuse and relay thread interesting as I have puzzled over those no drum action faults for many years. Keep up the good work as Martin said.Re: Hpt dw DWF 30P/7 (Bosch) pcb repair. Detail required.
gandh1 wrote:were turning into the new-wave of the masters of the shantytowns thanks to mike 😀
Have only a faint clue of what this and your other reference to fairies in pockets are about but I suppose that just reflects on my lack of culture 😳 .
Anyway, you’ll be pleased to know that I’ve got a second hand board on the line now (£10 + post) and am just reeling it in. Negotiating skills is something else that I’m learning from this 😉 .
Mark, yes, business is about making money but if you can find enjoyment in your work, it helps it feel less like work and enables you to carry on with it longer. (Maybe even 65+ 🙁 )
Mike.
- You must be logged in to reply to this topic.