[Duo2400] Re: Duo 280c Screen "Whiteout"

[George Morris]

Well, now I'm getting the problem every time I power up my 280c.
After a few seconds the screen fades to white.  This is a different 
problem it seems to the subsequent postings on this topic - which 
seem to be diagnosing "blackouts" rather than "whiteouts".

I've checked the ribbon cable connector - that's fine.  I've also 
opened up the screen case but cannot see anything obvious which might 
be causing this fault.  I guess I'm just going to have to get a new 
screen, or probably a machine for spares.

Typical really, as I only just got this machine loaded up with all 
the software I was going to need!!!

G




>  > -----Original Message-----
>>  From: Duo/2400 List
>>  [mailto:DuoList at lists.themacintoshguy.com]On Behalf
>>  Of Jackie Lund
>>  Sent: Monday, December 16, 2002 8:54 PM
>>  To: Duo/2400 List
>>  Subject: [Duo2400] Re: Duo 280c Screen "Whiteout"
>>
>>
>>  Other than the lamp and the inverter board, what other
>>  parts would you
>>  recommend switching, since neither of those replacements
>>  had any effect?
>>
>
>Check the supplies to the inverter board, there should be a constant
>voltage (12V?) and a second input that controls the brightness, this
>second voltage should change as you adjust the brightness, also there
>should be an inhibit line to turn the inverter off when the machine
>sleeps.
>
>This has just reminded me of a common but easily overlooked fault on
>many notebooks, CHECK THE LID SWITCH!!! (sorry for the cap's but it is
>easily overlooked), there is a switch that signals that the lid is
>shut, it switches the inverter off, if it is damaged or stuck then the
>inverter will never power on.
>
>Unfortunately I don't have any schematics, so I cannot tell you which
>line is which, the best thing is if you can borrow a working unit and
>compare the various lines to the inverter board.
>If there is no power to the board then check the motherboard, there is
>probably a fuse in the DC section for the inverter power, other than
>that I cannot offer any more help (unless you are in the UK then I
>could take a look at it for you.)
>Ben.