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Laptop issues Backlight or Inverter?


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#1
Tim'A

Tim'A

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I'm working on a Toshiba A75-S209 Laptop. The picture still shows, but the backlight isn't working. It's currently torn apart at my workstation. I took my fluke meter to the inverter outputs, and even with the laptop off, I'm getting a solid 4VAC. Then once on for a second, it jumps around to the low to mid teens. It is also making a higher pitched buzzing noise.

I'm thinking the inverter is my culprit.

I hooked the backlight up to the inverter just to see if it even flashes for a quick second.
Right when the high pitched buzzing begins, it illuminates dimly on about 2" - 3" of a single side. After about 1.5 seconds it goes dark again.

Is the backlight getting worn out? Or is the buzzing, irratic voltage outputting inverter my issue?

THANKS!

--Tim
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#2
SRX660

SRX660

    motto - Just get-er-done

  • Technician
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If you can connect to a external monitor and the picture is good, then the problem is the screen. Have you read this foner article?

http://www.fonerbooks.com/test.htm

Here's another good tutorial.

http://www.inventgee...rts/lcdfix.aspx

good luck
SRX660
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