Toshiba Satellite L305D-S5934

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I have a friends Toshiba Satellite L305D-S5934 and he is having LCD
The computer is on but the screen is dark. You can see an
image on the screen,
its just not lit up like it should be. I'm not sure
if it could be the backlight
or maybe the power inverter. I had a
similar problem on a Gateway and ended up
replacing the LCD, the power
inverter and the LCD harness and still coundnt get
it to work. Could
anyone make a suggestion as to which one might be the culprit?

Thanks in advance,

Re: Toshiba Satellite L305D-S5934

nick2498 typed on Sat, 16 May 2009 23:12:02 -0500:
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Hi Nick! Well these symptoms are almost always either the lamp or the
inverter. To determine which one requires measuring voltages as high as
2,000 volts. And it is pulsed, so a cheap voltmeter will not give an
accurate reading, but a scope will. But they cost like $500 and up. So
it is often just cheaper to either guess or to just replace both.

I had never seen a bad cable yet, but so many others have found that a
bad cable can cause this too. So I don't believe anybody can tell you
why the lamp isn't lighting, but it is one of the three is a pretty sure

Oops! I almost forgot. Also check the reed switch for the lid. As this
turns off the lamp too for most models. You can verify the lid switch is
working by telling Windows to go into Hibernation or Standby mode when
the lid is closed (Power Options in the Control Panel).

Gateway MX6124 - Windows XP SP2

Re: Toshiba Satellite L305D-S5934

Normally, a dark LCD is the inverter or the lamp.  The lamp is inside
the LCD panel, and while technically replaceable, it is difficult to
actually replace it (sometimes essentially impossible, other times only
difficult).  The inverters are easy to replace and not too expensive
($10 to $40) so that's where most people start.  [It is not easy to
determine if the lap or the inverter is the problem with any simple
diagnostic tests.]

RARELY, the problem is the cable harness from the base to the lid, or
the motherboard and/or video card.

nick2498 wrote:
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