4.2 Validation and handoff

Lesson

Hardware safety: isolate power; never open a PSU.

Before touching hardware

Follow the exact model's service instructions. Shut down, unplug mains and peripherals, and disconnect any internal battery as instructed. Sleep, the PSU switch, or unplugging a laptop charger alone does not fully isolate power.
Let parts cool. Use a clean, dry workspace and approved ESD precautions. Hold boards by their edges, avoid contacts, account for screws, and never force connectors.
Never open a PSU or insert tools through its vents; stored energy can remain after unplugging. Use only modular cables confirmed compatible with the exact PSU model.
Isolate power before every physical change or cleaning. Powered tests are software/external observations with hands and tools out. No live probing, unspecified pin bridging, or damaged-battery servicing.
Stop for damage, swelling, liquid, burning smells, or unclear instructions; consult qualified service. Photos, diagrams, and supplied readings are sufficient for these exercises.

Service and ESD guidance · Example PSU cable chart. Check your exact model.

Practice lab

0 / 1solved

Saved on this device. Practice is ungraded.

Weekly presentation on the required 1080p classroom projector.Stable call with camera, microphone, headphones, and the intended wireless connection.The IDE, browser, and call run together within the agreed responsiveness target.Projects can be recovered after accidental deletion or loss of the internal drive.

Lesson notes

Test the user requirements and preserve a support record before handing off a build.

Validation layers

Validate boot, firmware settings, drivers, storage health, memory stability, CPU and GPU temperatures, display modes, network behavior, audio, sleep or wake behavior, and the user workloads named in the requirements.

Test idle and load temperatures.
Run the actual apps or games the user cares about.
Check ports and wireless behavior.
Record baseline scores or observations.

Handoff package

A useful handoff includes a parts list, serials when appropriate, warranty notes, firmware and driver versions, backup advice, known limitations, and maintenance schedule.