Electronics > Repair
Repair of Bosch induction cooktop touch controls
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ievosabo:
Hi, after reading all this, I decided to fix the cooktop one more time ;)
Short flashback: my previous step was using silver conductive glue to fix the covering of the "gray" sensors. I would say it was not a great success, but at least 90% of sensor buttons were reanimated.
I used a Kapton tape and thin copper wire this time. So, I soldered to every button's resistor the thin copper wire. The wire got the form of a not closed-loop rectangle over the sensors. These tiny "antennas" are covered by Kapton film to keep them intact.
Hence, I have every sensor with an individual wire over it and every sensor isolated from a fiberglass top by Kapton tape. Every button works precisely and has no problem whatsoever. I must test it under thermal stress, using all induction areas simultaneously when cooking a lot.

Thanks for advising the engineers. It looks like you are right. There are two major issues/things: 1. make sure sensors are appropriately isolated (I used a Kapton tape in my case) 2. improve/fix sensitivity by duplicating a sensor area with an extra copper layer (I used thin wire, as do not have dedicated copper tape recommended above) but it works and the idea the same.

Did nothing with the ICs.

I hope it helps you with the repair work.
scooch:
Hi.  Thanks so much for the information and hoping to fix our cooktop and we keep losing one button after another.

I think I understand your method but any chance you could post a picture?
It would be greatly appreciated!
scooch:
Klimfit.  I have the exact same problem and same type of cooktop.  Elevating the control panel helped with some buttons.
It seems that the black silicone substance on the glass may have lost its conductivity and/or shrunk.
Wondering if you ever resolved your issues?  Thanks.
buhini:
Hi, first of all introduce myself because I'm new to this forum.
 My name is Rafa and I am fond of electronics, my job is a vehicle mechanic.
The second thing to apologize for the bad translation of google translator, since I do not speak English.
I wanted to show you my experience with my bosch induction hob, the same one shown in this thread.
The same thing happened to me as to the rest of those affected, loss of touch on the buttons, at first I didn't mind losing the 9 or 0, but when the power stopped working I couldn't stand trying to repair it.
My first option before discovering the forum was to resolder the most accessible resistors and capacitors on the entire board, this did not solve anything.
The next thing was to fit the electronic plate with cardboard below to raise the point of contact with the glass, but it didn't work either, it made error sounds.
So I found this forum and read it in its entirety, I ordered the 4053 chips on aliexpress and as soon as they arrived I changed the first one, the one corresponding to the power and lock button, tell you that I noticed a little more touch without the glass, but with the glass on did not work.
So I changed the 4053 chip corresponding to the most affected buttons, the ones that had to be pressed in the lower corner to be activated, in my case it was number 9, I put a new chip and before trying it I decided to resolve it with quality flux and Tin the rest of the 4053 chips, all of the ones on the back plate (be careful! Only resolder).
And it turned out positive! All the buttons on the panel revived like the first day with the glass on.
I have cooked and everything is correct, but I realized that suddenly the 0 button had failed again together with the 9 button, and the turn on button again becomes less sensitive and you have to press it a little harder, so I will disassemble again again and I will change the 4053 chip that affects those buttons and I will try again.
So I recommend not putting cardboard under the plate, since the problem is electronic and not due to the silicone of the glass.


Hola, lo primero presentarme porque soy nuevo en este foro.
 Me llamo Rafa y soy aficionado a la electronica, mi trabajo es mecanico de vehiculos.
Lo segundo pedir perdon por la mala traduccion de google traductor, ya que no hablo ingles.
Queria enseñarles mi expereciencia con mi placa de induccion bosch, la misma que se muestra en este hilo.
Me ha ocurrido lo mismo que al resto de los afectados, perdida de tacto en los botones, al principio no me importaba perder el 9, o el 0, pero cuando dejo de funcionar el power ya no pude aguantar a intentar repararla.
Mi primera opcion antes de descubrir el foro fue resoldar las resistencias y condensadores mas accesibles de toda la placa, esto no soluciono nada.
Lo siguiente fue calzar con carton por debajo la placa electronica para elevar el punto de contacto con el cristal, pero tampoco funcionaba, emitia sonidos de error.
Asi que encontre este foro y lo lei entero, pedi los chips  4053 en aliexpress y en cuanto llegaron  cambie el primero, el correspondiente al boton de encender y bloqueo, deciros que note un poco mas de tacto sin el cristal, pero con el cristal puesto no funcionaba.
Asi que cambie el chip 4053 correspondiente a los botones mas afectados, los que tenia que apretar la esquina inferior para ser activados, en mi caso era el numero 9, puse un chip nuevo y antes de probarlo me decidi a resoldar con flux de calidad y estaño el resto de chips 4053, todos los de la placa trasera (ojo!!, solo resoldar).
Y resulto positivo!!, todos los botones de la placa resucitaron como el primer dia  con el cristal puesto.
He cocinado y todo correcto, pero me di cuenta que de repente el boton 0 habia vuelto a fallar junto al boton 9, y el boton de encender de nuevo vuelve a ser menos sensible y hay que apretarlo un poco mas fuerte, asi que desmontare de nuevo y volvere a cambiar el chip 4053 que afecta a esos botones y volvere a probar.
Asi que recomiendo no poner carton debajo de la placa, ya que el problema es electronico y no por la silicona del cristal.
buhini:
In the end I decided to change the control panel because I repaired the contact buttons three times by changing the chips, and it lasted working well for a couple of hours, then they failed again, I bought the control panel directly from Bosch, 179 euros, and it works perfectly, they have modified some things and removed others.
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