IBM T40 Display Problem

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My dad has an IBM T40 which is having a strange display issue.  It
usually boots fine, loads Windows (Vista), and then after a few
seconds the display goes black, as if it is turned off.  The lights on
the keyboard and power light are still on.  I thought it was a short
in the LCD cable so I set it on a desk and turned it on, not touching
it at all, and it did the same thing after a few seconds.  Once in a
while it will not come up at all from boot-up, and gives error beeps
(1 long 2 short I think - I looked them up and it said 'display
failure').  I tried connecting an external monitor but it won't come
up at all.  I rebooted a few times and pressed the function key to
switch LCD->monitor but no luck.  The monitor reads as if the cable is
disconnected.  I have disassembled it and blown dust out of the LCD
cable connector, but still no luck.  I don't know if I should bother
trying to buy another LCD cable, as it won't even display on the
external monitor.  Does that mean it's a board problem or could it be
anything else?

FWIW, I tried swapping out the hard drive with one from my T40, to
rule out software problems.  Didn't make a difference, still the same

Thanks for the help.

Re: IBM T40 Display Problem

In typed on Tue, 5 May 2009 11:35:44 -0700 (PDT):
Quoted text here. Click to load it

Sure sounds like the LCD, cables and the light is fine to me. But just
to make sure, shine a bright light on the display and make sure there is
nothing displaying very dimly. Which would mean the lamp isn't lighting
and the display is fine. If nothing, sure sounds like the video card
(probably integrated on the motherboard) is bad or the power regulators
are bad (probably on the motherboard too). <sigh>

Asus EEE PC 701G4 ~ 2GB RAM ~ 16GB-SDHC
Windows XP SP2

Re: IBM T40 Display Problem

BillW50 wrote:
Quoted text here. Click to load it
Very common failure of t40/t41, of the graphics chip separating from its
socket. There are really no fixes for it.
Attach a regular monitor to the laptop to see if you get the same results.

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