![repair - What is the black stuff on the PCB below remote control buttons? - Electrical Engineering Stack Exchange repair - What is the black stuff on the PCB below remote control buttons? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/mdlX6.jpg)
repair - What is the black stuff on the PCB below remote control buttons? - Electrical Engineering Stack Exchange
![Remote control CB beyond repair? I cleaned all with contact cleaner, no difference: some buttons work, others do not. Worth trying conductive paint on black contacts under the buttons? The closeup shows Remote control CB beyond repair? I cleaned all with contact cleaner, no difference: some buttons work, others do not. Worth trying conductive paint on black contacts under the buttons? The closeup shows](https://preview.redd.it/ffx6vbqrzbp71.jpg?width=640&crop=smart&auto=webp&s=a45c1ccf7077816193582c87bb646b27a3525364)
Remote control CB beyond repair? I cleaned all with contact cleaner, no difference: some buttons work, others do not. Worth trying conductive paint on black contacts under the buttons? The closeup shows
![Keypad Fix, Clean and Restore Conductivity to the Carbon on the Keys and the Copper PC Board Pads - Keypad Repair Kit - Amazon.com Keypad Fix, Clean and Restore Conductivity to the Carbon on the Keys and the Copper PC Board Pads - Keypad Repair Kit - Amazon.com](https://m.media-amazon.com/images/I/81TA6A2s0vL.jpg)