> -----Original Message-----
> From: PowerBooks [mailto:[EMAIL PROTECTED]]On
> Behalf Of Gary
> Lauterback
> Sent: Tuesday, May 07, 2002 2:38 PM
> To: PowerBooks
> Subject: PB 5300cs Screen Backlight
>
>
> Hello.
>
> I'm new to the list.
>
> I've got a 5300cs that boots up etc. . . . But the screen
> is dark. I've
> adjusted the brighten & contrast buttons (on the front of
> the screen) to no
> avail. I can shine a bright desk top lamp (light bulb)
> onto the screen, and
> I can see that the screen is functioning, just not back lit.
>
> I've changed out the PRAM battery (Just in case it was at
> fault) no change.
> My guess is that the backlight (duh) needs replacing.
>
> Anyone got one of these for a reasonalbe price? Instructions?
>
> Thanks for your help & consideration.
>
> Gary
>
I do not know specifically about the 5300, however I used to do
notebook repairs (PC mostly) and in this situation it was usually the
inverter that supplies the HV to the tube (caution 3-400V!)often it
was no more than the supply fuse on the inverter board, other times it
was the driver transistor or even the transformer (shorted turns).
As you will have to take the screen apart anyway, you can check the
backlight tube, if it is not physically broken then look for other
faults. (as long as it is intact it will light up if the inverter is
functioning, but maybe not to full brightness if it is old.)
Ben.
NB another thought, check the switch that indicates the screen is
closed, on a lot of notebooks that turns off the inverter, if it is
stuck or broken that may be your problem.
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