Electronics > Repair
Repair of Bosch induction cooktop touch controls
cozza:
That looks to be the same series of board, from a larger cooktop. I'd try getting it fixed before ordering a new one though.. there must be a good surface mount rework place somewhere nearby in Hong Kong?
As the metal strips on the end of the cook surface are grounded, I've gotten into the habit of touching the trim before touching the controls to dissipate any body charge to avoid a repeat failure :-+
If I was in your city I'd take you up on that beer, after changing the chips!
Pasa001:
Repairs have been completed. I took the board to a cellular phone repair facility in Vancouver British Columbia and explained to them what I needed repaired. They unsoldered and resoldered two HC4053 chips on the board completed the work for 100.00 Canadian dollars. I'm not returning back to Hong Kong until mid April so I won't know until then if the repair was successful. I'll post again once I reinstalled the board into the induction cooktop. I added a picture of the two chips that were replaced.
Pasa001:
Last one
thm_w:
--- Quote from: chris_leyson on May 06, 2019, 11:24:08 pm ---
--- Quote ---It's not an uncommon fault, for one or more of the buttons to stop working or be intermittent in operation, according to the repair person.
--- End quote ---
not at all surprised because it's designed by engineers who don't give a damn. Well maybe the engineers do give a damn but they have to design to minimum manufacturing cost and not for performance and long term reliability...
--- End quote ---
I agree with the second point, very few people care about long term reliability. But your first point is a bit off base.
This is a four layer board, its not "no expense spared" but its very clearly not the cheapest design that could be made. Look in an average microwave oven and you'll see a single layer board with no-name components.
ClausRye:
I found this article very interesting even though it is a little bit old.
I have the same board not being able to turn on the power.
After removing the glass top-lid I found the power touch-sensor still working (touching it directly) making it possible to turn on the device and test-operate the the other touch-sensors directly without the top-lid.
With the device turned on, I have tried to mount the lid hoping to test/operate the cooktop. Unfortunately I am too slow as it turns off automatically after 10-15 secs... So I can not tell if the other sensors are working with lid on.
My questions are:
- Can a defective 74HC4053 still work with reduced sensitivity or is my missing/reduced sensitivity caused by another issue?
- Is there a way to measure the good and bad ones with a multimeter?
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