its cheaper an easier to get a replacement then burning or shocking your self
Low Voltage Circuit! If it were a power supply with 120VAC input, then yes, but 12VDC = NO unless you plan on using your tongue...LOL The only high voltage circuit may be the backlight with a ballast circuit, but just dont have it powered and touch circuitry. Within about 5 seconds after its unplugged of 12VDC power the ballast should be drained. If it were a Flash Circuit for a Camera you'd have to worry about a 400VDC CAP storing power, but not with displays which quickly drain.
Cheaper and Easier to replace... yes if the funds are there to do so and you don't want a project.
Depending on application of Capacitor, you can use different values and get by. If you know what you are doing (do the math ) and cant find the correct replacement ( odd microfarad value for example and has to be exact almost an impossibility these days with parts so easy to get ) you can connect 2 capacitors together to make the desired value similar to resistors to take 2 and make a different value that is desired for the application. Biggest importance with capacitors are their rated voltages and polarity if electrolytic or tantalum etc. If it calls for a 50VDC Capacitor, dont use a lesser voltage unless you are positive the voltage will never exceed its maximum operating value or POP, Smoke, and Stench! Tantalum capacitors like to burn like magnesium when they fail.