Laptop Screen

klightspeed · 18th March 2007, 3:21 PM

My laptop has suffered some abuse over the past couple of weeks, and so my screen has failed.
I made a video and put it on YouTube.
http://www.youtube.com/watch?v=Bz8SeHXzvUE

The screen is a loss, so I decided to dismantle it and take photos.

The screen is a LP141WX1.

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LVDS Connector

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LCD Controller (KE5M5U2455)

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Contrast? Or LCD Drive?

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Screen without backlight

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I have to flex the screen to get it to work.
I guess some traces in the screen are probably cracked, and flexing the screen makes them connect.

-=Alfonzo=- · 18th March 2007, 4:34 PM

It doesn't appear cracked, if the screen was cracked then it'd resemble something like this. (that one's had a good old drop).

I'd be inclined to track down another screen from that model and see what swapping over the pcb does. I don't know what it'd do about those vertical lines, but the refreshing thing and scrambled image looks like the controller is screwed.

Though after a quick ebay search, given the price of these results I'd probably just end up replacing the screen full stop.

you_is_teh_keke · 18th March 2007, 6:18 PM

yeah judging by that the controller is busted.

klightspeed · 18th March 2007, 7:15 PM

AFAICT, this LCD works like a big analog DRAM, with 800 rows of 3840 analog bits.
It has 6 column drivers and 3 row drivers.
There are something like 150 lines going to the column drivers, but only a handful of lines going to the row drivers.
It would appear that the row drivers act something like programmable shift registers, while the column drivers act as latches.
The vertical lines in the whiteout are probably from charge leaking out the column lines.
The vertical lines at the end are dead columns, from the column lines either detaching or breaking.
It would appear that some of the traces leading to the row drivers are broken.
If the controller were buggered, then I don't think that flexing the screen would help.

Replacing the PCB is not an option, since it is either glued or welded to the strips that the column drivers are on.

From what I've seen, I'd have to order a screen from the US.
The US$165 screens that you quoted are "100% Compatible" third-party screens. From the fact that the signals seem to be the same as the DVI Connector (four LVDS pairs, each with a shield; DDC; Presence detect; Power), I would believe the "100% Compatible" claim. The fact that the shell of the notebook has a mark for a 15.4" screen lends further support for this claim.

A possible project: I might see whether the signal is DVI. My 19" monitor has a DVI connector on the back, so with the right hardware, I might be able to test this.

18th March 2007, 3:21 PM	#1
klightspeed Member Join Date: Mar 2003 Location: Blowin' Bowen Posts: 251	Laptop Screen My laptop has suffered some abuse over the past couple of weeks, and so my screen has failed. I made a video and put it on YouTube. http://www.youtube.com/watch?v=Bz8SeHXzvUE The screen is a loss, so I decided to dismantle it and take photos. The screen is a LP141WX1. Click to view full-sized image! Hosted by UGBox Image Store LVDS Connector Click to view full-sized image! Hosted by UGBox Image Store LCD Controller (KE5M5U2455) Click to view full-sized image! Hosted by UGBox Image Store Contrast? Or LCD Drive? Click to view full-sized image! Hosted by UGBox Image Store Screen without backlight Click to view full-sized image! Hosted by UGBox Image Store I have to flex the screen to get it to work. I guess some traces in the screen are probably cracked, and flexing the screen makes them connect. __________________ Laptop: Tos. Sat. M300 2GHz C2D 2048MB 320GB HD3470 Vista+Gentoo \| Server: J&W 790GX AMD X2 5050e 2048MB 1TB+500GB GF-GTS250 Gentoo Sister's Computer: MSI K9N6SGM-V AMD X2 5050e 2048MB 40GB+250GB GF-GTS250 WinXP Cert. III in ICT

18th March 2007, 4:34 PM	#2
-=Alfonzo=- Member Join Date: Apr 2003 Location: Redland Bay, BrisVegas Posts: 7,191	It doesn't appear cracked, if the screen was cracked then it'd resemble something like this. (that one's had a good old drop). I'd be inclined to track down another screen from that model and see what swapping over the pcb does. I don't know what it'd do about those vertical lines, but the refreshing thing and scrambled image looks like the controller is screwed. Though after a quick ebay search, given the price of these results I'd probably just end up replacing the screen full stop. __________________ successful trades \| car Last edited by -=Alfonzo=-; 18th March 2007 at 6:21 PM. Reason: fixed first link.

18th March 2007, 6:18 PM	#3
you_is_teh_keke Member Join Date: Feb 2007 Posts: 38	yeah judging by that the controller is busted. __________________ http://www.deeko.com/images/articles...neighbors5.jpg

18th March 2007, 7:15 PM	#4
klightspeed Member Join Date: Mar 2003 Location: Blowin' Bowen Posts: 251	AFAICT, this LCD works like a big analog DRAM, with 800 rows of 3840 analog bits. It has 6 column drivers and 3 row drivers. There are something like 150 lines going to the column drivers, but only a handful of lines going to the row drivers. It would appear that the row drivers act something like programmable shift registers, while the column drivers act as latches. The vertical lines in the whiteout are probably from charge leaking out the column lines. The vertical lines at the end are dead columns, from the column lines either detaching or breaking. It would appear that some of the traces leading to the row drivers are broken. If the controller were buggered, then I don't think that flexing the screen would help. Replacing the PCB is not an option, since it is either glued or welded to the strips that the column drivers are on. From what I've seen, I'd have to order a screen from the US. The US$165 screens that you quoted are "100% Compatible" third-party screens. From the fact that the signals seem to be the same as the DVI Connector (four LVDS pairs, each with a shield; DDC; Presence detect; Power), I would believe the "100% Compatible" claim. The fact that the shell of the notebook has a mark for a 15.4" screen lends further support for this claim. A possible project: I might see whether the signal is DVI. My 19" monitor has a DVI connector on the back, so with the right hardware, I might be able to test this. __________________ Laptop: Tos. Sat. M300 2GHz C2D 2048MB 320GB HD3470 Vista+Gentoo \| Server: J&W 790GX AMD X2 5050e 2048MB 1TB+500GB GF-GTS250 Gentoo Sister's Computer: MSI K9N6SGM-V AMD X2 5050e 2048MB 40GB+250GB GF-GTS250 WinXP Cert. III in ICT