Compaq Portable II Maintenance And Service Manual page 77

To remove either system board, complete the following steps:
1. Remove the power supply subassembly chassis (see Section 7.6).
2. Remove the board slots access plate (see Section 7.10).
3. Remove all controller and option boards installed (see Sections 7.14
through 7.16).
4. Using Figure 7-42 as a reference, disconnect the mass storage
device power cable.