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Most laptop power supplies are made for a particular brand, so the best way to test is in another Dell laptop. The other way is using a voltimeter, first testing the power cord alone, and then testing the tiny connector.
With your laptop producing to much heat, make sure the air vents on your laptop are free of dust, debris, dirt, etc.
Also even though the CPU fan doesn't run all the time, make sure it is at least turning on now and then. If the fan doesn't turn on at all after say like 15 minutes then the cpu fan might be bad and would need to be replaced.
If your fan does turn on and still overheats then its the motherboard that is bad cause its not regulating the voltage that goes thru the board. This can happen when components go bad on the motherboard. I highly doubt its the lcd screen that causes the overheating cause it doesn't produce enough power to heat up hardly at all.