Dell Chromebook won’t charge or power on after DC jack wires ripped — LED flashes while pressing power

My Dell Chromebook is an older model I got from a friend. The DC power jack (where the charger plugs in) has always been a bit loose because of a missing screw, but it worked fine for months.
Yesterday, the jack became looser, and when I tried to plug in the charger, I pressed too hard. The DC jack moved inside the laptop, and later I found that two red wires were cut.
A repair technician soldered the wires back and checked the DC jack — it looks fine physically and should deliver power.
Current symptoms:
Plugging in the charger with the battery removed → no LED at all
Battery inserted → LED flashes white once briefly (but laptop does not charge)
Holding the power button → white LED flashes continuously, whether the charger is plugged in or not
Laptop will not turn on from the charger alone
Not sure if the battery is actually functional, but LED reacts when the charger is plugged in
Before this happened, the charging LED worked normally: red when low, white while charging, off when fully charged.
I suspect the DC input fuse may be blown or there could be a wiring issue. I want to identify the fuse location or figure out what else to check. Any guidance is appreciated