If the system suffered liquid damage, look for green or dull gray oxidation around tiny surface-mount components.
The alphanumeric string is not a Dell part number, nor is it the model number of your motherboard. dell e93839 motherboard schematic link
This specific number points to Foxconn (Hon Hai Precision Industry Co., Ltd.), the massive contract manufacturer that builds motherboards for Dell, HP, Apple, and other major brands. If the system suffered liquid damage, look for
: Always ground yourself by touching an unpainted metal surface before handling components to prevent electrostatic discharge (ESD) damage. Never work on a board while it's plugged into power. If the system suffered liquid damage