540c LCD help

#1 Sat, 16 Apr 2011 - 05:38

The LCD inside my PowerBook 540c is a "Toshiba LTM09C017"...and I believe it's dead. I've swapped it out with

A greyscale LCD from my 540 (which works) and therefore I don't think the boards are the problem.

The Toshiba faded to blank white and it seems permanent...are there any retrofit LCD screens that might work? I found the same Toshiba on the web for $33 but I wanted to see if there were options. Thanks

#2 Sat, 16 Apr 2011 - 15:15

yup, its got a blank white display because your missing your control voltage. either from a popped SMD fuse on the panel itself, or other issue.

#3 Sat, 16 Apr 2011 - 15:38

Wow - thanks. Sounds like you know alot about these.

What I lack in knowledge, I make up for with a steady soldering hand. Is there any chance of repairing this fuse ?

#4 Sat, 16 Apr 2011 - 22:45

You have to find it first. It should be a small white SMD type fuse. some are different colors. hard to explain, must follow the VCC wire to panel.

And then you test with a meter to see if its open or not. if its still good, then something else is bad, maybe an IC or such.

Then if the fuse is bad, you have to find out what caused it. sometimes simply replacing it may work, sometimes not.

#5 Sat, 16 Apr 2011 - 22:57

Thanks techknight! Strangely this CRT came back to life today in all it's color glory....then promptly died again back to a solid white screen.

Could that still be symptomatic of a fuse ?

#6 Sun, 17 Apr 2011 - 00:33

If you're getting intermittant video, I'd suspect a damaged cable somewhere along the line, or a faulty connector/plug - test these out to see.

#7 Sun, 17 Apr 2011 - 05:36

If it comes back to life and goes away, its definately a cabling issue.