New inverter makes screen dim

July 28, 2010 at 12:02:38
Specs: Windows 7
My old inverter started making this hissing noise one morning when I opened up the notebook LCD and the screen started flickering. At first it wasn't as loud, but soon it got to be a pretty noticeable hiss and the flickering was also very noticeable with the screen blacking out after some time. I went and looked up the spare part number for a new inverter and ordered one from online. After installing the new inverter, the flickering and hissing noise stopped but the now screen shows up extremely dim, almost the the point where it is completely black right from when I turn it on. I reinstalled my old inverter just to check the screen out and the brightness returned to normal but the old inverter still has the hiss/flickering. When I hook the notebook to an external monitor, the monitor displays fine. Would anyone be able to help me on what is wrong?

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#1
July 28, 2010 at 15:29:20

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#2
July 28, 2010 at 16:00:53
http://www.laptoprepair101.com/lapt...

I meet all of these prerequisites which leads me to believe that the problem is the inverter. I knew this from before. What baffles me is why the brightness of the laptop is extremely dim when I put in the new inverter but returns to normal when I use the old inverter.


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#3
July 28, 2010 at 16:22:43
That is wierd.

Sounds to me like maybe your "new" inverter could maybe be uncompliant from the specs/hardware/compatibilty point of view. Or it is possible that the inverter you bought is bad as there are many vendors online that ship crap to unsuspecting customers; or went bad inside of the laptop after the repair of an ailing system. There are no guarantees that a new electrical part couldn't be damaged by installing it in a sick computer system. A few months ago, I stuck a power supply on a dead Gigabyte MOBO to see if it would boot in the troubleshooting process, well, it blew out the power supply!

Have to ask, but did you check the Video settings in the BIOS and in Windows?

Just another stupid saying...


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#4
July 28, 2010 at 16:34:00
no, i did not. i bought it from ebay from a reputable seller. i sent it in for a replacement and am awaiting for it to arrive. what did you mean by checking the video settings in bios and in windows?

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#5
July 28, 2010 at 17:31:08
Video settings: You can adjust video brightness settings on battery power and AC, as well as power management settings in the BIOS, but the Windows ACPI usually takes over. There are also video settings in video card control panel applications (Nvidia, ATI, Intel etc) too, depending on what video adapter you have in your laptop.

Strange that the old hissing inverter gives a bright LCD screen and new inverter does not with all other variables staying the same. If I had your system, I'd disassemble both the LCD and pop out the MOBO and look at it closely (capacitors, cables, connections etc).

Just another stupid saying...


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#6
July 28, 2010 at 18:05:11
Hmm, yes. i made sure to check the brightness and other screen acpi related configs when i installed, had no luck. I'm hoping that maybe it was a faulty inverter and the new one will fix things. The mobo thing sounds a little advanced, don't want to mess up wires as I try to get to it.

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