Chosen Solution
Hi have acquired a laptop to repair and it has shown some signs of life with a solid white light and reading the battery voltage and the voltage coming into the board it seems fine but will not power on. Have noticed the power button is shorted to ground even not when pushed. cheers Update (09/07/2021)
here you go … I can check other things for voltage too .. just let me know .. cheers
Hi @capsitup , Have you checked that the power button is not actually short circuit? Pin 2 of the power button is always connected to earth. When operated the button connects the earth through on pins 1 & 3 to the IO chipset. Here’s the LENOVO YOGA 510 14IKB COMPAL BIUS4S5 CIUY0Y1 LA E221P REV 1.0 schematic that may help. (verify that the model number matches your motherboard’s model number) Go to p.32 to view the Power button for Yoga circuit. It connects the earth to pin 114 of the motherboard I/O chip (southbridge) - see p.34. Hopefully a start.
