Having problems with your Acer Aspire 5100 Notebook ?

No Backlight on an ACER 4620

\015 I have an Acer Extensa 4620z where the screen had cracked. So I ordered a new screen and replaced it - but the backlight never came on. I tried the original and other good screens to test, but no light so it appeared the inverter had gone as well. Got two replacement inverters on priority mail - two just in case one was DOA. Neither successfully powered the backlight. I ended up coming across a laptop that used the exact same inverter so I swapped out parts and turns out the original inverter as well as the two replacements work perfectly fine in the other laptop. even tested the screen, hooking up only the inverter, and it is good. So I thought it MUST be the cable... but when I replaced it with a brand new and ridiculously expensive cable I still got no light. I suppose the mainboard has been screwed up and isn't putting out the right ammount of power to light the backlight...Some other things worth mentioning: I check the little switch that detects when the lid is closed - its not stuck down and pressing it down or keeping it up untriggered does nothing.I removed all hardware - not sure how this would effect it. Also tested with the battery+A/C, battery alone and A/C alone.There is a faint image on the screen and using an alternative monitor works.Messed with the brightness controls - nada.I did test the leads on different inverters when attached - power is getting through, all less than aboout 7V (with both old and new cable).I'm %#@$%$# stumped.\015

Answers :

I don't have an exact answer, but some thoughts & ideas.
\015\012It really does sound like an inverter. Is the screen the EXACT model as the other one you replaced, and is the inverter the EXACT one. One that is similar may not work.
\015\012The faint image is either a bad bulb or inverter. If that screen has never powered up and lit up, you might have a screen with a bad bulb.
\015\012I would leave the blame to the motherboard last. Your symptoms seem more like the inverter or bulb in my experiences.
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