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T42 - no LED lights along the bar above the keyboard

T4x series specific matters only
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DenverBrian
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T42 - no LED lights along the bar above the keyboard

#1 Post by DenverBrian » Sun Sep 17, 2006 6:06 pm

Hi gang - first post.

My 2379-DXU had a cracked screen, which I had replaced. However, now the LED strip won't light up - disk drive light, NumLock, CapsLock, power, etc. The only LED that's lighting is the wireless icon.

These LEDs appear to be part of the inverter card, so I bought a replacement inverter card and installed it, but no joy.

Any ideas?

tfflivemb2
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#2 Post by tfflivemb2 » Sun Sep 17, 2006 6:17 pm

Does the system still work and the lights just don't come on...or are you saying that nothing happens, including the lights?

DenverBrian
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#3 Post by DenverBrian » Sun Sep 17, 2006 6:24 pm

The system works perfectly - I'm sending these posts on it - but none of the LEDs are activating.

agarza
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#4 Post by agarza » Sun Sep 17, 2006 9:56 pm

The leds on my t42p doesn't light up (the ones that you see when you close the lid). Mine has Battery, Power & BT. Any suggestions?
Current
T440p:
Core i7-4710MQ|16GB RAM|Intel 200GB SSD| 14.1" AUO IPS FHD|Win 7 Pro|T450 Trackpad|Backlit keyboard|2nd Caddy

T460p:
Core i5-6300HQ|16GB RAM|lPNY 256GB SSD| 14.1" Panasonic IPS WQHD|Win 7 Pro
Past: T420 HD+, X61s XGA, T61 14" SXGA+, T42p 14.1 SXGA+, T30, A22e

mitchellst
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#5 Post by mitchellst » Fri Jul 20, 2007 10:35 am

I've got the same issue after an LCD replacement. I'm pretty sure that it has to do with the LCD. I've replaced the inverter just to see, but no luck. Everything works fine, but the lights don't come on.

SHoTTa35
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#6 Post by SHoTTa35 » Fri Jul 20, 2007 10:50 am

did you upgrade the LCD or just change to another of the same. Maybe all the cables aren't connected properly. I haven't removed a T4x series LCD in a while so i forgot what it entails but if you upgraded the LCD i know you should at least need a different LCD cable (XGA to SXGA+)
Current - Thinkpad T410si - Core i3 330m, 4GB, 250GB 5400RPM, WXGA+, FPR, BT, Camera, DVDRW, Gobi2000, Win7 Pro x32
Past - Thinkpad T410 - T400 - T61 - T60 - T43 - T42 - T41 - T40 - T23 - 600X

mitchellst
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#7 Post by mitchellst » Fri Jul 20, 2007 1:17 pm

That's the strange part. It wasn't an upgrade or a downgrade. The screen works fine, but the LED lights aren't on.

I removed part 92P6761, and replaced it with part 92P6680.

Part Number: 92P6680
Description: LCD PANEL, 15" SXGA+



Part Number: 92P6761
Description: LCD PANEL, 15.0" SXGA+



The strange part is that they don't appear to be sub parts of each other, even though they're both 15" SXGA+. Both are used in this model as well (2373).


I guess I need to see if I can get another LCD shipped to me.

Stargate199
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#8 Post by Stargate199 » Fri Jul 20, 2007 3:04 pm

I think the LEDs are controlled via the LCD cable. Try replacing that and see if the LEDs work again.
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Previous ThinkPads: T41, T21, 600E

mitchellst
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#9 Post by mitchellst » Fri Jul 20, 2007 3:07 pm

I'll give that a shot. I think I have another good cable sitting around here somewhere. I hope that's what it is.

mitchellst
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#10 Post by mitchellst » Fri Jul 20, 2007 3:25 pm

Nope. Still no lights.

aphex4k
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#11 Post by aphex4k » Wed Aug 08, 2007 8:43 am

Hello everyone!! I registered for this forum just so I could post a reply to this problem as it had frustrated me for a while as well.

I ran into the same problem when I replaced the panel on my T42. It turned out to be some pins that were pushed in on the LCD connector on the motherboard. How do I know? I tried the newly repaired lid on a second T42 and all of the indicators worked without a problem. Additionally, the indicators on the lid of the second t42 did not work on the first T42. I chalked it up to rough handling when attaching the ribbon cable to the motherboard.

The fix? I used a very, very fine needle to pry the pins back out and that resolved the issue. (This took a good half hour...and several needle pricks)

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