T420s i7 with backlight but no image - bad cable or LCD?

[ji2o0k]

Hi all, hoping you can help out.

I just picked up a T420s i7 that has backlight but no image. Any thoughts on what it could be?

I am hoping it is just a bad LCD cable (I have an extra one) or possibly even a bad LCD screen?

I think this will be a great candidate for the IPS WQHD screen mod when the kit becomes available....hopefully soon right RMSmajestic?

Any advice is appreciated - i'll attempt the dissemble this weekend (time permitting)

[TPFanatic]

I had a similar predicament with a T410. Disassembling the lid and reseating the LCD cable where it connects to the screen fixed the issue. I had already tried reseating the cable at the motherboard connector and that didn't work.

If you can get the computer into an OS, helpful to have an external monitor, does anything display at all?

[ji2o0k]

I had a similar predicament with a T410. Disassembling the lid and reseating the LCD cable where it connects to the screen fixed the issue. I had already tried reseating the cable at the motherboard connector and that didn't work.

If you can get the computer into an OS, helpful to have an external monitor, does anything display at all?

Yes, I hooked it up via vga cable to an external monitor and everything boots up properly (I was able to get into bios etc)....


Ok, I'll try reseating the LCd cable...

[ji2o0k]

quick update on this issue....

I took apart the T420s this past weekend.....pretty much full dissemble so I could clean out the chasis as well as re-apply some new Arctic Silver 5 thermal paste on the heatsink.....

Took apart the screen\bezel etc....cleaned it with all the dust (compressed air) and swapped out the LCD cable with a confirmed working one.....same issue....backlight works, the brightness can be adjusted using Fn + Home or End but no clear image.

I am thinking it is the LCD screen (not the inverter or a blown fuse) because the brightness works...thoughts?

Purchased the FHD IPS mod kit from RMSMajestic and will do the screen swap, hopefully everything works after the swap!