: This is a common board for the 4520s. You can find the boardview and schematics for this specific version on Geek Dais or through specialized technician archives on Telegram .
Featured a optical drive for burning disc labels Common Repair Tasks RAM Upgrades | ProBook 4520s - max up to 8GB RAM Upgrades | ProBook 4520s - max up to 8GB. www.compuram.biz hp probook 4520s boardview
HP often changes resistor values or moves test points between revisions. You risk misrepair. Find the exact revision. : This is a common board for the 4520s