Bosch SGS43A52/35 – UK Whitegoods

This topic has 8 replies, 4 voices, and was last updated 15 years, 1 month ago by Harrop.

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February 26, 2011 at 1:08 pm #61328

Harrop
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Bosch SGS43A52/35

Has an issue with top tray not cleaning – located broken tab at ‘nose’ of upper spray arm, where connects underneath top basket.
Replaced.
Still got problems with only the lower arm rotating – upper arm is always in same place as when I shut the door & run a cycle.

Searched on 2 possible issues –
The grandly named instantaneous water heater – apparently a disc inside controlling flow of water to arms
The less fancy named control unit (PCB) – dead components on circuit board

Thanks to some great help already given on this site, I figured out the simplest check would be the PCB
Went looking for blown ICs or capacitors, & sure enough, I found a hole in the top of a chip (see pic #1)

So, this part is listing around £100-120, but repairs are 50{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} cost.

Can anyone say for sure this dead IC is the cause of my problem?
IE.. does the dead IC shown have anything to do with water heater/spinny disc control?
Given the amazing prices parts command, is it worth repair or better to go with replacement or even NEW machine?
Thanks

February 26, 2011 at 7:09 pm #345694

Specialist01269
Participant

Re: Bosch SGS43A52/35

Hi: Don’t know about anyone else but i don’t get any pictures. If there’s a hole blown in the top of the chip, can you still see the chip number? another thing to consider is that an IC will not normally just blow for no reason so there will rpobably be other problems to contend with as well.

February 26, 2011 at 10:23 pm #345695

CJAPeterborough
Participant

Re: Bosch SGS43A52/35

From my own experiences and having taken a heater assembly apart
I believe the drive mechanism is purely mechanical ie the motor does
not change direction(a set of cogs which switch a flap back and forth continuously)
So if the motor fails (or control to it) it will be stuck in one position.
There are three connections to it so a meter reading across them
may help diagnose if the motor has failed.

Perhaps one of the pros on here will comment?

To further confuse things though the triac does look blown…..and if this
motor is controlled by the triac then a board repair could sort the problem.

The motor is easily replaced(if you can source one) as its only held in place
with a couple of screws on the underside of the assembly.
If you are handy with a soldering iron then the chip replacement is straighforward.

February 28, 2011 at 12:33 pm #345696
Harrop
Participant
Re: Bosch SGS43A52/35

Many many thanks for your replies, chaps 😀

Specialist01269 wrote:Hi: Don’t know about anyone else but i don’t get any pictures. If there’s a hole blown in the top of the chip, can you still see the chip number? another thing to consider is that an IC will not normally just blow for no reason so there will rpobably be other problems to contend with as well.
CJAPeterborough wrote:So if the motor fails (or control to it) it will be stuck in one position
..
Perhaps one of the pros on here will comment?
..
To further confuse things though the triac does look blown…..and if this
motor is controlled by the triac then a board repair could sort the problem
..
If you are handy with a soldering iron then the chip replacement is straighforward.

Removed ‘riser’ pipe (2 screws), reveals 2 inlets feeding lower/upper arms

appears to be rotating disc with holes punched thru & there is 1 hole at front inlet visible only (lower)
therefore, no feed to rear….

I can always drop the heater box and see if anythings jammed but the popped component is a worry still

Indeed, I’ve fixed a few gadgets powered by elastic-trickery in my time.
would need to know the part I was replacing I expect…
any techs with knowledge of, out there?

edit.. maybe it is same as the one partially obscured by the blue capacitor?
February 28, 2011 at 2:16 pm #345697

Specialist01269
Participant

Re: Bosch SGS43A52/35

Hi: As this is a surface mounted component, you need to be very careful when trying to replace. It’s very easy to take the print right off the PCB if your not extremely careful.
You should be able to follow the print tracks from the chip to it’s board connector & then follow the wiring from there to the faulty component.
The part looks like it may well be a control Triac, unfortunately surface mount Triacs are not usualy readily available to the public.

March 3, 2011 at 4:32 pm #345698

Harrop
Participant

Re: Bosch SGS43A52/35

Specialist01269 wrote:The part looks like it may well be a control Triac, unfortunately surface mount Triacs are not usualy readily available to the public.

Nothing that the likes of Farnell / RScomponents / Maplins would have ??
So it’ll be the £50 notes repair Vs the £100 notes for a new one contest 🙁
Originally cost £100 new on a Staff offer; Might ask around for a friendly card holder to blag us another bargain…

cheers

March 3, 2011 at 4:49 pm #345699

Specialist01269
Participant

Re: Bosch SGS43A52/35

Let me know the part number you need & i’ll see if I can get you some.

Andy

March 3, 2011 at 6:24 pm #345700

nomadPaul
Participant

That TRIAC does indeed control the water point motor so you will need to sort out the motor actuator too or any replacement TRIAC ( not even sure it can be replaced ?) will pop staight away !!

March 3, 2011 at 7:00 pm #345701

Specialist01269
Participant

Re: Bosch SGS43A52/35

Yep they can be replaced, can be done DIY but even easier if you have Hot Air re-work station 🙂
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