Help>Replaced broken LCD but cant get an image to appear!

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djThinkbad · #1 Post by **djThinkbad** » Thu Mar 13, 2008 8:14 am

Hi I replaced the lcd on my T43p (sxga), booted up the laptop and the LCD comes on (its bright), but for some reason there is no picture (no images are displayed)...

What could be causing this, since when connected to an external display the images appear ?

Troels · #2 Post by **Troels** » Thu Mar 13, 2008 3:49 pm

Hi,
well it's typically just white because it is the default state for TN screens, when no power is applied to the transistors. I tak it it's a 14.1" LCD?

With that in mind, i don't think the pinout of the replacements screen is correct, i.e. not the same as your old lcd.
The cable could also have come off the lcd again.
Was the LCD an original IBM replacement part?
If it wasn't - what is the model number and manufacturer of the LCD?

#3 Post by **carbon_unit** » Thu Mar 13, 2008 4:43 pm

Did you replace it with the exact same LCD or a different one. If it is a different one you may need to get the correct LCD cable for the new display. They are not all wired the same.

#4 Post by **richk** » Thu Mar 13, 2008 6:10 pm

Did you replace the panel or the assembly?

Phazer · #5 Post by **Phazer** » Thu Mar 13, 2008 6:33 pm

If you replaced an SXGA with an XGA, I'm about 99.9% sure you HAVE to change the cable also. If it was an SXGA for an SXGA swap, it sounds like a compatability problem. I wouldn't keep trying it, I'd look for another panel. You might do other damage.

djThinkbad · #6 Post by **djThinkbad** » Fri Mar 14, 2008 9:10 pm

Hi everyone and thanks for replying!!!

I replaced a 14.1" SXGA screen with a new SXGA 14.1" SXGA screen bought from ebay. The screen is actually like new since it was pulled out of a T43p with a bad motherboard.

If I connect the laptop to an external display/monitor, everything works and images show up on the monitor.

Can someone please tell me if the screen could be bad, if it lights up but no images display?

joester · #7 Post by **joester** » Fri Mar 14, 2008 9:28 pm

I suppose the display could be bad, but I would verify/compare the P/N's on the two LCD's, and look very closely for a cable or connector that has slipped.

Joe

#8 Post by **Harryc** » Fri Mar 14, 2008 9:37 pm

If you replaced just the screen, it could be a loose connector at the back ot the LCD or the one that connects to the system board. Reseat both of those. If that's not it, assuming that your old LCD signal cable is still around, swap cables.

djThinkbad · #9 Post by **djThinkbad** » Fri Mar 14, 2008 9:50 pm

Thanks joe and harry, I tried using both, the old and the new cables with the same results.
Actually my old cracked screen displays images with both cables.
I think there is something loose inside the LCD or something, but for some reason its not totally dead since it lights up

The cable is providing it with the information/signal for the images but for some reason it doesn't wanna display them.
I am not sure what to do at this point

#10 Post by **Harryc** » Fri Mar 14, 2008 9:53 pm

If the old LCD lights up with the same cable and the new one does not, the new LCD itself is defective. Return it if you can.

Help>Replaced broken LCD but cant get an image to appear!

Help>Replaced broken LCD but cant get an image to appear!

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