Hope you figured it out but if not - your Mac most probably alive.
No the difference in the voltage should not do any harm unless it delivered in spikes of enormous amplitude which should be rare even in Philippines
Could you please precise with what key combo have you tried to restart?
Have you tried Control+Option+Shift+Power button?
If not - try it.
Same key combo as for SMC reset but one quick press.
If it is up and running - great. If not - try to do SMC and PRAM reset and see what’s happening. Normally it should fix your A1708.
If not - I would first check the power supply module whether it is working with something else.
If it is working and your Macbook Pro still show no signs of life then the deeper investigation will be necessary.
Let’s hope it will not be that serious.
Please post your findings and we will proceed from those.