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Basically, they usually switch on when you put a battery in (provided the battery isn’t flat). If it switches on when you insert a new battery, but not when you press the on button, it suggests the switch has broken. If it appears completely dead even with a working battery I’m not sure what it could be! The scales are easy enough to dismantle with a Phillips screwdriver and a set of mini screwdrivers. Having a look at the circuit board might give you an indication as to what the problem is. Look for discolouration or corrosion. It’s harder to tell if a switch is knackered without destructively dismantling it.
Replacing the switch is a simple enough affair. Remove the solder on the switch using a soldering iron and a solder sucker of some sort, then bang a new momentary switch on.
I used these, 6x6x4.3mm
https://www.ebay.co.uk/itm/231957884472
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Nef
Battery change does nothing - do you have any more info on the solder fix? I've no experience soldering but my step dad might be able to help...