[DuoList] 2400c problem

[Tom and Lisa P]

>Hi listers,
>
>I recently received two 2400c  laptops in a trade; both have problems.
>
>#1
>Once chimes & starts  running the hard drive when powered, but the LCD screen
>does not come on. I  tried switching LCDs with another one that I know works,
>but the result is the  same. Also, the reset switch does not restart the
>laptop. I also switched the  swtich from a known working 2400c.
>
>Other than some motherboard problem,  could the LCD not working be from some
>other source?

Did you try an external monitor ?  Also, shine a light on the LCD 
while attached, maybe the backlight power is out and the rest is fine.

A guess at this point would be the video chipset or VRAM chips.

>#2
>The other  2400c does not do the startup chime when powered, ever, but when
>powered it  starts up the hard drive and the LCD comes on. But only a white
>screen is  displayed, and I never see a cursor. Tried using an external source
>for the OS,  but no change.
>
>I am appreciative in advance of any  help,

Hmmm... that sounds similar to several 3400 I had which had blown 
FETs.  Inspect the boards for small 8 pins square units (~0.75x0.75 
cm chips) for bulges or distortions.  Also try swapping power and CPU 
boards to see if swaps make the difference.

Mad Dog