Pluged by mistake a 110V HS50M on a 220V, obviosly not working any longer. Is there a fuse inside that could be replaced or the whole thing burnt out?

fuses only protect against excess current flow and are not affected by voltage
take it in for a proper diagnosis and quote

There is an over-voltage protection fuse, but, it is inside the transformer. It can be replaced by experienced service technician. Contact any one such.

Tech guys only.. Remove rare,side,top covers, rare metal sheet cover, you can see the Low vol power supply, check input 220V/110V(depends power standards) fuse. If fuse burnt check primary section is there any component failed? replace same rated fuse the try it.. if successful no issue, if fuse burnt repeats replace "Power Supply".
If fuse burnt after fuser drive starts, replace another fuser then try it. (faulty fuser also one of the cause to fuse burnt)

If you want to fry your electronics or appliances that's it's a sure way to accomplish that.
While appliance working ONLY at 220v will just not work or under perform (like a hair drier) when plugging electronic equipment that runds ONLY at 110v then that item will be "fried" as all its electric components will be burnt as it will receive twice the power that it was build to receive. Should that happen the safety switch on the 220v circuit where the item was MISTAKENLY plugged will be triggered (hopefully or there will be risk of fire and serious injuries, even death) and the power will be shut off. That's a major but possible mistake.
If traveling abroad those who come to US will unlikely damage their appliances (like electric razors) as they will receive less power (110v vs 220v) and usually these items are protected against these mistakes by the specifications of their own design. The opposite is not true of course as just mentioned above.
So do not play around with dangerous items please! ;) On a positive note though: Nowadays most appliances have dual power and should work whether plugged in a 110v, 60Hz (most common in US) or 220v 50Hz (most common in Europe). So nothing really happens... it just works as long as you have the proper adapters to plug the appliance to the different receptacles.
Note: One of the differences is that (without going into the math of it all), an appliance working at 110v will draw x2 times the power than it draws when working on 220v so if an appliance was drawing 3A at 110v it will only draw 1.5A when working at 220v.
Best.

The moment you plugged it in and tripped the fuse bad things happend, so most likely it won't hurt it anymore to plug it back into 220, although it could over volt and catch on fire. I would check the back of the screen to find out what it's operating range is. Many electronics are designed for a range of voltages to deal with other countries and power sources. I would guess something failed inside the system, most likely the Power Control Board (PCB) Why it held up for the night I have no idea.

no heat usually means your only getting110 volts into your dryer.....you need the full 220volts to run heaters....with voltage meter you checkwires on the plug OUTLET...or inside back cover REDwire to WHITEwire =110v.........BLACKwire to WHITEwire =110v.....REDwire to BLACKwire =220v. you probably have aBAD 220V. 30 amp circut breaker..or if still using FUSES one is burnt out (In house electric panel) or burnt off RED or BLACKwire in back of dryer.....

You have damaged the system beyond economical repair. There are so many components inside that have fried that it is impossible to repair. Sorry. That's what happens when you overvolt an electronic circuit.

scrap the trimmer...
probablly damaged beyond cost of new one

a step down transformer would have been a better choice than a voltage converter ( not trying to be a wise guy here)..

The Fuse for these model is 110V - 250V, so definitely the machine will still light up for a moment then black out. So if you accidentally plugged it to 220V (if it is 110V) you have to change the whole PCB. Electric current are distributed by PCB which only handles 110V.

I suggest when you change the PCB try to change also the Fuse to 110V only so that next time if by accident it was plugged to 220V you just have to change the Fuse not the PCB.

I

I don't know for sure, but I suspect that if you open it up, there should be a fuse near the power supply portion of the unit. It may have taken the hit for you and can perhaps be replaced easily. (As a disclaimer... be sure the unit is not plugged in when you open the case! And only replace the fuse with another of equal rating.) If it's not a fuse, then you probably smoked the primary winding of the transformer. If it got past that, you may have popped the rectifier and/or capacitor(s) in the power supply.