Here’s a step-by-step tutorial on how to replace the power button (on/off switch) board in a HP ProBook (450 G4 455 G4 470 G4) using compatible part numbers like:
🔧 How to Replace the Power Button in HP ProBook
⚠️ Disclaimer
This repair involves opening your laptop and handling small ribbon cables. Proceed carefully, as forcing the connectors may cause permanent damage.
🧰 Tools and Materials Needed
Phillips screwdriver (PH0 or PH1)
Plastic spudger or pry tool (optional)
Replacement power button board: 905754-001 DA0X83PB6D0
Anti-static wrist strap (recommended)
🔌 1. Power Off and Unplug
Shut down the laptop completely.
Disconnect the charger and all external devices.
Hold the power button for 5–10 seconds to discharge remaining power.
📦 2. Remove the Bottom Cover
Place the laptop upside down on a soft surface.
Remove all screws securing the bottom panel.
Carefully lift off the bottom cover.
🔋 3. Disconnect the Battery
Locate the internal battery connector on the motherboard.
Carefully disconnect it to avoid short-circuits.
🔘 4. Locate the Power Button Board
The power button board is usually located near the top edge of the chassis (close to the hinge).
It is connected to the motherboard with a flat ribbon cable.
🖱️ 5. Remove the Old Power Button Board
Gently lift the locking tab on the ZIF (Zero Insertion Force) connector and disconnect the ribbon cable from the motherboard.
Unscrew or unclip the small board holding the power button in place.
Carefully lift the board out.
🔁 6. Install the New Power Button Board
Place the new board into the same position.
Screw or clip it securely into place.
Reinsert the ribbon cable into the motherboard connector and lock the latch.
🧩 7. Reassemble the Laptop
Reconnect the battery.
Reattach the bottom cover and secure it with screws.
⚙️ 8. Test the System
Plug in the charger.
Press the new power button to turn on the laptop.
Verify that the system powers on normally.
🎉 Done!
You’ve successfully replaced the power button (on/off switch) board in your HP ProBook. This should resolve issues where the laptop was not turning on due to a faulty button or connection.