Not powering up, no display on the screen

My grandson dropped the switch, and not powering up , no display even when charger plugged in, no physical damage. I measured the voltage at the charger 15v, and on cpu board is 3.96v

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0