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Korg B1 digital piano

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3 dead keys throughout keyboard

I’ve had my keyboard for about 4 years now with no issues. Until that is, one day I went to turn it on and I noticed 3 keys (D, F#, and A#) were dead. The keys in the lower octaves are fine, but around the middle range is where the dead keys start. (Not sure of exact terminology lol). I opened up my keyboard to look at the circuit board and noticed some corrosion. I cleaned some off but no luck. I’ve attached an image. Those 3 keys stop working to the right of that spot, all down the board. I don’t know if this is what is causing it or if this is fixable.

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For @jayeff

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Hi

It could be that they need cleaned and also need some new carbon applied!

Iv seen keyboards that look new on the inside where their pads and the keys are and all they need in some new carbon

To apply it you can just use a normal pencil and simply draw the new carbon on but don’t put too much on and only put it in the pads and not on the circuit boards as we don’t want to short anything out!

Hopefully this helps

Any questions please ask

Thanks:-)

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Hi, how did you manage to open the piano if you don't mind me asking?

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Hi @kyragrassel

The problem is that a solder connection pad in the track multiple has effectively disappeared.

Here's a zoomed in image from the image you posted showing where it is located (or should I say where it was located)

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(click on image to enlarge).

I've highlighted the pad (4th from left in image) with a green box. The green arrowheads show the pads for the other keys

To resolve the problem you need to bypass the open circuit in the track multiple, with a wire that connects from the key's diode connection - see red arrowhead below green box, and run a wire to where the track connects to another key diode connection to the left and right of the key, by following the tracks associated with the keys. - see red arrows to the left and right in image.

Here's an image from an answer to a similar question for a Korg B1 I answered showing what it will look like

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(click on image to enlarge) - see blue wire that bypasses problem connection

Update (08/27/2022)

Hi @kyragrassel

Your image doesn't go far enough to the left so I've highlighted were you can connect to it.

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(click on image to enlarge)

The left image shows the connection from the key diode to a connector soldering point and the right image shows from the same key diode as the left image to the key diode on the right side.

My eyes aren't that good any more so if you start at the faulty connection as I pointed out before you should be able to follow the track on the board both ways to see where it goes from that point.

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Thank you so much! I wanna make sure I solder the wires to the correct key diodes. Do you mind highlighting the exact spots to solder the wire onto? I edited my post and added a more zoomed out picture for you to look at. This is my first time soldering and working with a circuit board so I’m a bit confused.

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@kyragrassel I really want to know how you managed to open it, I am unable to get the parts separated

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Kyra Grassel さん、ありがとうございました！
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