What is Reddit's opinion of Keypad Fix, Clean and Restore Conductivity to the Carbon on the Keys and the Copper PC Board Pads?

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Right. You'll need to desolder the caps lock to get the keyboard apart.

Also, the conductive pads on the key plungers will wear out over time. To refresh them, you'll need to paint them with stuff like this: https://www.amazon.com/gp/product/B0026PRMVM/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

I have seen both types of graphite pad - graphite only on the pad/button and plain copper for it's contact on the PC board, and graphite on the key and coating the copper. I have never had the graphite come off when cleaning with alcohol - it would be pretty obvious on a white cotton swab (Q-tip).

While researching to find more information (zero info says alcohol is not safe), I found a commercial product for treating conductive pads. DISCLAIMER: I have no idea if it works, has any negative effects, etc.: Do Your Own Research.

KeyPad-Fix

Also saw a post by someone that claims using graphite from a soft artists charcoal works on game controllers and remotes. They scraped it off into a fine powder, then used a small paint brush to apply it to the surface - no adhesive of any kind. I cannot recommend this. Even if it works, you run the risk of loose graphite flying around inside your electronics - never a good idea.

The easiest and cheapest way is to simply replace the rubber contact pad entirely. However, it is possible to restore full contact on the up direction with a keypad repair kit.

Related to the title question...

What components or methods exist for the conductive push-button (assumed)? The
general theory question is related. A practical whitepaper on how similar circuits are designed would be appreciated.

How are the circuits completed with the flexible push-button membrane? What is the conductive material, if that's how it works, on the membrane? How can it be designed into a product?

Related post: identifying_this_conductive_material

It could be conductive carbon: amazon.com/Keypad-Restore-Conductivity-Carbon-Copper/dp/B0026PRMVM

1. wikipedia.org/wiki/Remote_control
2. Phase Control Using Thyristors application notes
3. Thyristor Power Control by IR Remote article
4. howstuffworks.com/remote-control.htm/printable

> conductive material

Related post: identifying_this_conductive_material

It could be conductive carbon: amazon.com/Keypad-Restore-Conductivity-Carbon-Copper/dp/B0026PRMVM

https://www.google.com/search?q=rubber+dome+switches+repair

https://www.amazon.com/Keypad-Restore-Conductivity-Carbon-Copper/dp/B0026PRMVM

https://dengarden.com/appliances/How-to-Repair-a-Keypad-or-Remote-Control-With-Kitchen-Foil

Are the pads made of copper though?

Normally there is a type of graphite paint deposited on the board where the pads make contact. The pads themselves have a special graphite coating too.

Alcohol has been known to dissolve the graphite, making the problem worse.

couple of links I made before realising my pads were fine

https://www.keypadrepairkit.net/

https://www.amazon.co.uk/Keypad-Restore-Conductivity-Carbon-Copper/dp/B0026PRMVM/ref=pd_sbs_229_1/260-8246162-2565719?_encoding=UTF8&pd_rd_i=B0026PRMVM&pd_rd_r=883b14d5-26e3-4110-98a1-d8e65586899f&pd_rd_w=aUKiG&pd_rd_wg=m22fo&p...

so just be aware the problem really is dirty pads before going at them with solvents as you might end up making them worse.

Keypad Fix, Clean and Restore Conductivity to the Carbon on the Keys and the Copper PC Board Pads https://www.amazon.com/dp/B0026PRMVM/ref=cm_sw_r_cp_tai_wqjIFbXGDVFVK

https://www.amazon.com/Keypad-Restore-Conductivity-Carbon-Copper/dp/B0026PRMVM

Here is a compound that restores connectivity, so I assume it to be a conductive carbon