Troubleshooting keyboard or trackpad failures. Common Failure Points on LM495 MB 11269-2
Check the DC Jack and the first two MOSFETs near the power input. Without the schematic, you won't know the exact gate voltage required to open these chips.
To ensure you are getting the correct file, look for the following specifications: PDF
Use the schematic to identify which capacitors are on the main B+ line.
