Troubleshooting new Screen and waterlogging

Hi all,

I'm trying to troubleshoot what could be wrong so I'll spell it out step by step.

My partner has a series 3 42mm GPS only watch. She cracked the screen, I replaced it with a part bought in China. The new seal was a fraction too small over one corner and I told her not to get it wet.

Later, she jumped in a pool without realising and the watch stopped working straight away.

I lifted the screen up and there was water inside. I disconnected the battery, sprayed isopropyl alcohol inside, later hit it with a hair dryer for a while and left it with the screen open for 2 days. After that I rebooted it and it came back to life, unbelievable!

It stayed on the charger, working properly for 2 days until yesterday when I disconnected the screen to put a new seal on. I connected the screen back on and nothing, no sign of life. At one point it vibrated when I held down the button for a few seconds but it hasn't responded to any button pressing or rebooting since then. I've tried recharging, nothing.

I'm at a loss what to try next. Any ideas on what it could be?

I was pretty careful disconnecting and reconnecting the screen, could it be a broken cable maybe? Or is it possible the battery just upped and died due to the water coincidentally when I was doing the work?

Any pointers would be most appreciated.

Cheers, Ben

So an update - After 3 days of nothing, just sitting on the charger unresponsive, we get home from an outing and the watch is beeping away, I guess like the find my watch function?

Except we haven't touched the watch app at all on the iPhone it's paired to. Still no screen though. I pressed the button and the beep stopped. I tried a hard reset and after a couple of minutes the beeping started again.

Is this indicative of anything, other than the watch is royally screwed?