Check for 19V at the adapter connector and trace it through the first two MOSFETs. If the gate voltage is missing, the charging IC might be faulty.
To ensure you are using the correct diagram, confirm your motherboard part number. Most HP ProBook 4430s units use the platform. Board Number: 6050A2465101-MB-A02. Chipset: Mobile Intel HM65 Express. Processor Support: 2nd Gen Intel Core i3/i5/i7. Essential Repair Tools & Resources
Real-world measurements for critical power rails (like the 3.3V and 5V standby rails). hp probook 4430s schematic diagram patched
Professional-grade schematics for the 4430s are typically shared in technician forums. You can look for downloads on:
Necessary for tracing voltage through the EC/KBC chip (U2701) and checking the adapter enable signal. Step-by-Step Troubleshooting with the Schematic Check for 19V at the adapter connector and
Suggestions for jumping damaged traces or bypassing faulty ICs where direct replacement isn't feasible. Core Specifications for HP ProBook 4430s Motherboard
Unlike a schematic, which shows circuit flow, a Boardview shows the physical location of every component on the PCB. You can find these for the 4430s on sites like Dr-Bios . Most HP ProBook 4430s units use the platform
Trace the signal from the power button to the KBC chip . The schematic will show you exactly which pin should drop to 0V when the button is pressed. Where to Download