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The backlight inverter in my laptop blew, so I replaced the screen (by one with a higher resolution). The new screen is properly detected in Windows (8), but remains off, regardless of extend or duplicate settings. I've tested this by connecting another vga monitor. Is the new monitor faulty, or am I missing something obvious?

Laptop model: a52jb, which is effectivly the k52jb. Previous lcd panel: N156B6-L04, replaced with LP156WF1(TL)(A1)

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Sounds like you changed the LCD panel, but didn't actually change the Inverter itself. It's a separate piece from the LCD panel.

Example pic of inverter:

LCD Inverter

More types:

more example inverters

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The inverter is embedded in the lcd panel. – Lg102 May 14 '13 at 18:42
Perhaps you should edit your question to include the notebook model, the LCD panel you used, etc. Also, have you taken it apart again and confirmed all connections are connected and seated correctly? – Ƭᴇcʜιᴇ007 May 14 '13 at 18:48
Ok, I've added the requested data. I've also taken in apart again, yes. – Lg102 May 15 '13 at 5:36

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