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. If your laptop isn't powering on, these are the first points to check with a multimeter to see where the power sequence is failing. Component Identification
. Finding the exact circuit schematic for this board typically requires identifying its "Compal" or "Wistron" board number, such as the Troubleshooting & Repair with the X8J6L Schematic
Product Identifiers. BrandHP. MPNX8J6L. eBay Product ID (ePID)5058771398. HP ProBook 450 G6 Core i5-8265U Motherboard (X8J-6L)