While changed the voltage from 19v to 24v,the display become dark.What can ?

I think PC Tech means "You might HAVE blown the back lights"

Actually, I interpret your statement "While changed the voltage from 19v to 24v,the display become dark" to mean that somehow you tried to run the computer off a supply providing 24V, instead of the correct unit which supplies 19V.

If this is the case, you could have done all sorts of damage.

I just wonder why you did it.

Allan
December 2010

You might of blown the back lights

PC Tech
December 2010