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after eplacing LED it never give display

February 2, 2013 7:39:11 PM

Good Evening, Couple of days ago, I was replacing broken LED from Acer Aspire 5742 core i3 series. In broken LED it was giving display. But after eplacing LED it never give display. We tested external display is not showing, RAMs, Processor, and VGA chipset is been tested, all things are working fine. Replaced LED connecting Cable didn\'t work, replaced another working and tested LED didn\'t work, When we turns laptop on, it gives power to fans, then no beep nothing happens, looks like some problem on board, what can be the problem