Laptop dell inspirion 5558(motherboard failure)

Everything is soldered to the board. See the service manual for what you can replace-- https://topics-cdn.dell.com/pdf/inspiron-15-5558-laptop_service-manual_en-us.pdf When the board dies on a laptop it is probably time for a new computer. It is not worth spending $150- $250 dollars for a refurbished board IMO. The $250 board has the Nvidia card but it is Out of Stock . https://www.parts-people.com/index.php?action=category&id=141&subid=525&refine=motherboard Did you try replacing the coin cell battery? Directions in the service manual. Cheap fix if it works.