Go Back   Tech Support Forum > Hardware Support > Laptop Support

Lenovo T400 backlight issue - common solutions not working

This is a discussion on Lenovo T400 backlight issue - common solutions not working within the Laptop Support forums, part of the Tech Support Forum category. Hi all, I have a T400 that had a CCFL backlight go out. Pretty typical symptoms, pinkish hue before death


Reply
 
Thread Tools Search this Thread
Old 12-22-2011, 10:43 PM   #1
Registered Member
 
Join Date: Dec 2011
Posts: 2
OS: windows 7 home sp1



Hi all,
I have a T400 that had a CCFL backlight go out.
Pretty typical symptoms, pinkish hue before death and slow regression.
The thinkpad logo is still visible without the backlight so I know the screen is fine and external monitors will display an image.

I automatically assumed it was the backlight so I went ahead and had it replaced. To my dismay, I powered it up and no dice.

Next I tried the inverter... still nothing.

Thinking that my backlight job wasn't that great I found a new LCD and plugged it in. Still nothing.

I'm kind of at a loss right now. I'm hoping it's not the motherboard but I know for sure that it's not the inverter or the lcd screen.

Any thoughts on what the issue could be?

__________________
kaplac is offline   Reply With Quote
Old 12-22-2011, 11:51 PM   #2
dai
TSF Team, Emeritus
 
Join Date: Jul 2004
Location: west australia
Posts: 74,479
OS: win 7 32x 64x rtm



have you tried increasing the brightness with Fn key

Black Screen Issues and Troubleshooting

if external works it usually indicates b/light/inverter or a faulty cable or connection

__________________
dai is offline   Reply With Quote
Old 12-23-2011, 12:42 AM   #3
Registered Member
 
Join Date: Dec 2011
Posts: 2
OS: windows 7 home sp1



Dai,
I've already tried the procedure in the link and the backlight is completely off so it's not an issue of brightness.

I think I've ruled out any backlight or inverter issues already so I guess I should check the lcd cable.

Any suggestions on where to start?
With the current cable I can tell there is an image going to the screen because there is a faint image of the thinkpad splash screen. The keyboard light and inverter also appear to be receiving power (lights are turning on) the only things that doesn't appear to work is the backlight.

Is it common for ribbon cables to break in this manner?
__________________
kaplac is offline   Reply With Quote
Old 12-23-2011, 03:07 AM   #4
dai
TSF Team, Emeritus
 
Join Date: Jul 2004
Location: west australia
Posts: 74,479
OS: win 7 32x 64x rtm



occasionally there can be a break in the cable

my knowledge on laptops is very limited
__________________
dai is offline   Reply With Quote
Reply
Gear in this thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
External disc folders dispay as shortcuts
I think something must be wrong with my external disc folders and folders on my external HDD. They show up as shortcuts. When I open them a new window is opened and I can access the content. However that seems very strange. Also, I noticed that the update of my Antivir Software does not work...
armbroke Virus/Trojan/Spyware Help 2 08-31-2011 08:25 PM
Startup time from 75 seconds to 165 seconds. What is wrong?
Hello forum. I have a month-old Dell Inspiron N7010 Core i5 460M with 6 gigs of ram running on Windows 7. Until recently, it has been starting up in about 75 seconds. However, out of nowhere, it suddenly began starting up in between 2 and a half minutes to 3 minutes. I am completely baffled,...
SimTmiCro Windows 7 Support, Windows Vista Support 6 05-10-2011 09:01 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is on
Smilies are on
[IMG] code is on
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Post a Question

Gear in this thread


» Site Navigation
 > FAQ
  > 10.0.0.2


All times are GMT -7. The time now is 02:04 AM.


Copyright 2001 - 2014, Tech Support Forum

Windows 7 - Windows XP - Windows Vista - Trojan Removal - Spyware Removal - Virus Removal - Networking - Security - Top Web Hosts