T500 Display Problem

[JC8686]

I recently upgraded the display on my T500 from the 1280x800 panel to the 1680x1050 panel however when i installed the display and booted the machine the backlight stopped working but I could make out the faint lenovo logo. When I went to reseat the ribbon cable and inverter it stopped displaying an image and the status LEDS also stopped working and when I connected to an externel monitor it only recognised the monitor.

I have tried two different ribbon cables and two inverters however they all produce the result above. I know that this could be an issue with the fuses being blown however I dont think this happened as the battery was disconncted during the process and there was no flash from to the screen to indicate a blown fuse. It is also not an issue with the panel as I swapped back in the old display but it produced the same problem.

I am creating this posts to see if anyone has a solution or has encountered the same problem and would be able to share their thoughts as to how they resolved the issue.

[RealBlackStuff]

Maybe you changed from a CCFL screen to a LED screen.
In that case you also need to change from an inverter card to a LED control card.
See the HMM for details/part numbers.

[JC8686]

I'm not sure I dont think that is the case as they only made the 1280x800 in LED and mine was not.

[RealBlackStuff]

Your reply makes no sense...

[TPFanatic]

In my opinion it seems most likely something on the board failed, could be fuses. Fuses are replaceable. I agree it should not have happened because power was disconnected, I have no belief against your due diligence. I blew up a T540p once even tho the power was disconnected, the caps were still charged, I thought I’d drained them but I guess not

Things happen, unfortunately.

[JC8686]

Tested the fuses with a multimeter today and they seem all good. I'm just going to order a new inverter board and hope for the best.

[teamde78]

Tested the fuses with a multimeter today and they seem all good. I'm just going to order a new inverter board and hope for the best.

Yes agreed, I would try a new inverter board.