PDF schematic for the Lenovo ThinkPad E440 motherboard, board number NM-A151, 1.79 MB. The NM-A numbering follows the Compal/LCFC scheme used for many Lenovo laptops. Repair technicians use these pages to follow the main power rails, the charger circuit and the standby supplies, to check signal names between the PCH, embedded controller and connectors, and to work out which component a short sits on. Open it in any PDF viewer and search by net name. Make sure the board number etched on your PCB reads NM-A151 before relying on values or part placement noted here.
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