T400 LCD screen is very dim, but icon lights for HDD, etc. are working

Hi - I'm wondering if anyone knows what the issue with my T-400 would be if the LCD screen is very dim. Details include:
- When I boot up, there's a faint outline of what is going on, but barely noticeable since the whole screen is very, very dim
- Video card is working okay, because I can operate the laptop when I plug in an external monitor
- The icon lights for HDD, power, battery, etc. are still working
Thanks so much for the help.

First a question: Is it a CCFL backlight or LED? If it is a CCFL, it could be just the inverter, which is a lot cheaper than the panel. If the CCFL bulb goes out, usually (but not always) there is a red tint to the screen for a while first. The LED backlights are less likely to blow and there is no inverter. (The LED backlight is DC and the inverter convers the DC to AC to drive the CCFL bulb) Do you know which kind of backlight you have? If you don't know, send me your full model and serial in a pm and I'll look it up. Don't post it in the open forum. Also, what were you doing when it went out? Were you doing anything except normal work, like taking something apart or hooking something up?

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Having issues with the apparent brightness of my Lenovo W500 (suspected Samsung display) in reasonable ambient light levels, I thought I'd try measuring the lux with a tool I found at ->http://www.tuug.fi/~toni/serendipity/index.php?/archives/12-Luxus-light-meter-desktop-widget-for-N90...  -- just for a more objective, albeit uncalibrated view on brightness.
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The dell 2005fp is rated at 300 yet I score 150 above (though this is NOT on max, just normal)
The dell studio 17 is rated around 317 on full -- and the score above shows this as close
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The W500 is on full brightness & using the appropriate monitor.inf under win 7
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The "spec" of the W500 panel is 180-200 I believe - it's clearly not fair to use the numbers literally, but something is very very wrong.
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Anyone else fancy measuring a "current" laptop for comparison -- especially any other W500 owners (some of which have samsung panels, some have LG panels)

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Hi gurus:
This concerns replacement of LCD Screen on my 14" T400 Laptop, which i'd purchased on Jan 14 2009.
>> This is a LED backlit WXGA+ Screen.
Usage:
** Very light usage; 2-3 hrs/week;
** Used this as a standby for my work laptop.
** Sparingly used for pretty much anything.
** I am very disappointed with this laptop and all through its performance and battery life has been very sluggish. (1 hr battery at the most).
>> Runs very slow even with Vista/XP downgrade
Problem:
>> 1.5 yrs later, the LCD screen on this laptop doesn't turn on.
>> I have tried the LCD Troubleshooting Guide @:
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-4YQHUC
** The screen is just plain dead. No startup blink. Nothing.
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44C1347
SBB 14.1"WXGA+LEDB/L BTCAMWWAN
FRU Part#
Mfg part# FRU part # Description Serviceable?
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** What are my options in getting going with this laptop?
>> The LCD screen conking out in this manner with minimal use is unacceptable, according to me.
>> I had checked the price online for the Retail replacement part, and it brings it to a total of $400 approx.
Is there any extended warranty for the LCD screens? Any advise over where to buy from?
Regards,
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Hi Rich:
Thanks for your reply.
* I tried connecting the VGA cable to my LCD Monitor/TV, but i do not see any output after selecting the Secondary Display.
* When i boot up the Machine, the LCD does not blink/flicker e.t.c, but i can see that the regular bootup is happening as i look at the Hard Drive light and it keeps flickering.
* How do i check the LCD sub card? I am assuming its the panel because the LED Light on top of the Screen seems to turn on.
* Yes i have only the 1 year warranty.
>> My previous Dell Inspiron which had the same warranty term lasted about 4 years and only gave up because of the Motherboard.
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regards,
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T400 LCD screen black after replecement

History - T400 (2767-31U), Win 7.
LCD screen broken due to a drop. Laptop still worked with an external monitor via VGA slot and I ordered a replacement LCD.
The replacement finally (used-off ebay) arrived and I followed the HMM manual and replaced the LCD. But it still does not work. I can continue to use the ext monitor without any issues. The replacement LCD was the full assembly not just the LCD screen.
Here is what I noticed:
1. When booting up, I see the Thinkpad logo very very faintly before it goes fully black again.
2. All the LCD panel lights work fine - Wireless, BT, HDD, Battery, Power etc etc including the reading light.
3. The laptop recognizes when I open and close the lid and switches on the ext monitor accordingly.
Here is what I did (I followed the HMM to the detail):
4. When I replaced the LCD, I noticed that the original LCD had 2 black wires insulated at the ends originating from the bottom left area of the LCD that were not actually plugged into any area of the MB. I did the same on the replacement LCD and left them as it is. I don't even know what these are.
5. I connected the other 3 wires(white, grey and black) and the main connector as the original LCD/HMM.
6. I uninstalled the display drivers and restarted and Win 7 automatically installed the drivers again.
7. The Most important part - The original LCD when powered on, DID have backlight showing me the mangled area of the screen so I know it worked before replacement.
I have read quite a bit of posts regarding T400 black screen issues, pointing me towards a faulty MB, blown fuse or faulty inverter. I know the replacement is an exact replica of the original LCD.
Could it be that I didn't connect the wires correctly to their respective slots on the MB?
Any inputs would be highly appreciated.
Edit:
Solved!
Go to Solution.

Welcome to the forum!
Do I understand correctly that you bought a complete new LCD Assembly? Do you have proof from the seller that it was working properly before you bought it?
Can you see a picture if you use a torchlight over the panel?
A faint dark picture could be a defective LCD cable, inverter/LED card or a defective LCD backlight. Since you see a picture I would rule out a motherboard fuse problem.
Edit: Richk was faster!
/L40SX/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E/A20p/A22p
A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T4x0x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/10*X2xx/2*X200T/4*X30x/Z60m/3*Z61x
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T400 LCD Screen flickers or blinks every 5 seconds

T400 with Win XP Pro and Integrated Graphics, all the latest updates. Even did a Rescue to original factory.
I have read numerous issues with Thinkpad screen flickering, but have not found a solution for my laptop.
My T400 just started doing the following: Every 5 seconds, the screen will flicker one time looking like an old CRT screen rolling over once. Every 5 seconds. Oddly, this occurs only at the 60Hz rate. When I set the rate at 50Hz, the problem appears to get fixed. I have disable the Graphics Battery power option.
The flicker occurs during boot up even on the initial black / white screen, narrowing it down to hardware or bios.
Given the number of LCD issues I've read about on this era of machine (2009), I called Lenovo to see if there was a recall - they said no. I'm a Thinkpad fan, but I am beginning to wonder if Lenovo is not acknowledging a known defect.
I just want to know what to fix. Is this a defective LCD screen, or a motherboard chip issue?
Any thoughts out there??

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This isn't a widespread defect AFAIK.
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