Ben wrote:
Hi ,

Having a laptop with a suspected bad backlight or Inverter.

I had changed the BL but still no display. Can see the image on the screen
with a flashlight but the BL doesn't lit.

How can I confirm if the Inverter is OK ?

What is the voltage that I should read at the BL input ?

I have a scope if required.

Tks...


If you changed the backlight, what's left besides the inverter?
I'm gonna guess that the liklihood of an inverter failure is
MUCH greater than the liklihood of failed logic driving it.
Unless you have access to a high voltage probe, the backlight
voltage will be well in excess of the rating on most normal scope
probes. And if the new backlight is not lit, you can suspect that
the voltage ain't present. You can wave your scope probe around
over the backlight inverter transformer and tell if it's running.
There's often a cap in series with the backlight that can go open.
There's sometimes a fuse on the inverter board. Sometimes, they
go open for no reason.
mike

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