Re: HP W22 lights up then goes dark.
This link may help.
http://www.elexp.com/t_test.htm
But the hissing problem needs sorting first,if its coming from the conector it must be a bad conection problem, if you have something that is burnt then you will be able to see it, if it is not conector, search all components on front and back of board for signs of burning or bad heat damage, or it possible it could be damage to wire or conector to lamp inside screen,
Once you sort that out, go to page 9 of this thread, DAVMAX gives you every thing you need to know, good luck.
This link may help.
http://www.elexp.com/t_test.htm
But the hissing problem needs sorting first,if its coming from the conector it must be a bad conection problem, if you have something that is burnt then you will be able to see it, if it is not conector, search all components on front and back of board for signs of burning or bad heat damage, or it possible it could be damage to wire or conector to lamp inside screen,
Once you sort that out, go to page 9 of this thread, DAVMAX gives you every thing you need to know, good luck.
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