Question about IBM ThinkPad T42 Notebook

1 Answer

There is a delay when pressing the keys on my thinkpad T42

When i type normally no letters show up on my screen. but if i hold a key down there is a several second delay before it shows up on the screen. i was told to replace the keyboard and i did with a new one but its still the same. my laptop is a IBM think pad t42, model # r4u, machine type 2378 s/n l3bhh60, windows xp-pro sp2. can you help me. thank you.

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  • 17 more comments 
  • scottzilla1 Dec 16, 2008

    when it is on with no other programs other then whats needed for the laptop cpu is at 1%, pm is at 52318 and available is 301188 and cache is 205792. but when i am running my isp and spy ware and paltalk programs the cpu jumps up and down between 35 to 100 and the pm 523184 total and available is 90365 and cache is 206192. and all programs on the laptop work great with no slow down. its just my keyboard delay that seems to be the problem. scott

  • scottzilla1 Dec 16, 2008

    but it lags when the cpu is at 5% or 10%. why would it lag then. what do you think i should do. scott

  • scottzilla1 Dec 16, 2008

    all my programs don't lag. it only lags when i type. i have spy sweeper for my spy ware. but if you think i have spy ware on the lap top i would appreciate knowing what program to get . and i defragged yesterday. scott

  • scottzilla1 Dec 16, 2008

    ok i will do that right now give me about a half hour to an hour. and thank so much for your help i really appreciate it.

  • scottzilla1 Dec 16, 2008

    ok i have installed and ran both spybot and ad-aware. and then i checked to see if it fix it but it did not. there is still a delay when i type. what do you want me to try next. scott

  • scottzilla1 Dec 17, 2008

    it is consistent. it is not intermittent.

  • scottzilla1 Dec 17, 2008

    yes it is consistent. not intermittent.

  • scottzilla1 Dec 17, 2008

    ok the repeat rate was already set at the fastest setting . so i set it slower and hit apply. and the rate did not change . then i set it at its fastest again and hit apply. and the rate still stayed the same. also i tried resetting repeat delay and hit apply and no change either. it seem i canot effect the rate it wont do it . i noticed the driver tab. and button that says update driver. should i try that. also i did run the troubelshoot for it and it say the keayboard is fine. so what should i do . scott

  • scottzilla1 Dec 17, 2008

    ok no its not a fancy keyboard. ok it is going to restart. then what do i do

  • scottzilla1 Dec 17, 2008

    ok it rebooted but it still has the delay

  • scottzilla1 Dec 17, 2008

    ok i will give me about 15 to30 minutes this may take some time. i will let know asap

  • scottzilla1 Dec 17, 2008

    i typed in the search keyboard optimizer but no mach. do you know how to find it

  • scottzilla1 Dec 17, 2008

    ok i downloaded it and rebooting the computer but i ran it and it just went to a location on the computer. look like there is nothing to configure. should i download the read me file too. and it has rebooted and still not working

  • scottzilla1 Dec 17, 2008

    i found it and i will work on configuring it . i hope i did not get you to frustrated if i did i am sorry. i will let you know how it worked out thank you for all your help. scott

  • scottzilla1 Dec 17, 2008

    ok bro thank you and really appreciate your help.have a good night .scott

  • scottzilla1 Dec 18, 2008

    hey robert just wanted to let you know xp sp 3 is trying to download on my laptop and spybot keeped messing up the download so i had to temperately remove it. no sp 3 is downloading witch just might fix my problem. i did not want you to think i gave up. i will let you know if it works out. so i talk to you later bro. thanks and i really do appriciate your help. scott

  • scottzilla1 Dec 18, 2008

    hey robert i have tried many things that is not working so i am thinking it may be not enough ram. i have 512 mb ram so it just may be as simple as upgrading my ram. i have found a great deal at fry's corsair ddr 2700 1 gb modgual for 12.99 after mail in rebate. i am going to buy 2. its a great deal. i will let you know if it worked. i know it may be a long shot because it seems that my laptop runs fine with out lag. but i just dont know what else to do. so i will let you know how it worked out in a few days. thanks so much bro. scott

  • scottzilla1 Dec 18, 2008

    right sp3 has been trying to install but when it gets close to being done i get a notice that it cant install. witch may support the idea that i don't have enough memory. and no i have not added you i don't use msn. and yes i will definitely let you know how it works out. take care bro talk to you in a few days. ps. i will keep checking back in on the fourm until i get the new ram just incase you think of something i can try. thank you scott

  • scottzilla1 Dec 19, 2008

    hey robert well it is fixed it was a memory issue.i bought 2, 1, gig corsair sticks. and it only cost me 12.99 plus tax and s/h witch was 8.50. fry's online is ware i bought them. i installed them and the keyboard worked just fine. and i was finally able to get the sp3 to download. anyways i just wanted to tell you. thank you for all help. i know volunteering can be a pain when the person you are trying to help are jerks. so i really appriciate your help . ps. i will sacrifice beer in your name. lol thank you scott



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  • 5,158 Answers

You haven't mentioned how other programs behave. i would suggest it is spyware slowing your computer down or one program that is using up to my cpu usage. hitting control-alt-delete will bring up your task manager... at the bottom it shows cpu and memory usage as a percent.... what are the amounts ?


Posted on Dec 16, 2008

  • 11 more comments 
  • Roberta Smith
    Roberta Smith Dec 16, 2008

    at times when the cpu hits 100% i can guarentee you the keyboard will be lagged... consider running msconfig and removing some of the programs that run at startup.


  • Roberta Smith
    Roberta Smith Dec 16, 2008

    what program are you using when it lags.... or where are you typing ?


    and i'm suspecting spyware... a few free programs to remove them... when was the last time you defragged your computer as well ?

  • Roberta Smith
    Roberta Smith Dec 16, 2008

    spybot s&d and adaware.... get them both as they are freeware... i'll post some other programs to use after you have installed them... updated them and run a scan.


  • Roberta Smith
    Roberta Smith Dec 17, 2008

    something did just occur to me... is it a consistant delay or just occasionally ?

  • Roberta Smith
    Roberta Smith Dec 17, 2008

    guess i misunderstood you the first time then... go to start... control panel.... keyboard double click on that... when the window pops up you can change the repeat rate on the keyboard.

    Let me know how you make out with that

  • Roberta Smith
    Roberta Smith Dec 17, 2008

    ok... frustrating.... go into the start menu.... right click on my computer.... click on device manager... it's been awhile since i've used xp but i believe there is a hardware tab ... then it will be one of the buttons.... if not hardware click on each tab till you find the device manager button.... when you click on that a window will pop up... go to the keyboard thing and click on the plus sign to expand the window... i presume you only see one keyboard there.

    right click on it and select uninstall... yes uninstall... then you will get an ominous warning... click ok .... it should immediately reinstall the keyboard... if not go to the menu tabs and the top and select scan for hardware changes from one of the pop down menus

    see how it works then

    oh and is this some kind of fancy keyboard ???

  • Roberta Smith
    Roberta Smith Dec 17, 2008

    if you mean restart as in reboot.... then reboot it... it will detect and install the keyboard as it reboots


  • Roberta Smith
    Roberta Smith Dec 17, 2008

    one more thing to try

    go to that website and download the keyboard optimizer for the operating system you have... perhaps you can make changes there.


  • Roberta Smith
    Roberta Smith Dec 17, 2008

    i provided the link in my last comment to you... scroll down it's near the bottom of the page.


  • Roberta Smith
    Roberta Smith Dec 17, 2008

    try this... also when you went into the control panel.. did you make the keyboard repeat rate faster ? and this is it for me for tonite.. take care

  • Roberta Smith
    Roberta Smith Dec 17, 2008

    scott it's ok... i love a challenge... i just wish people realized that we are indeed volunteering our time and of course i always think to myself... it may frustrate me ... but it frustrates you to have the problem in the first place.. at least you are pleasant ... i've got lots of abuse on here too

    Take care


    and let me know if that does infact sort out the problem... if not i'll be around again tomorrow sometime.

  • Roberta Smith
    Roberta Smith Dec 18, 2008

    I was going to ask you why you still had sp2 and not 3 lol... yes ram is very cheap at the moment... i may be buying a few 1 gig for my desktops. not sure if you added me to your msn... i've been spammed so much lately i might have missed it.

    let me know how you make out.


  • Roberta Smith
    Roberta Smith Dec 19, 2008

    i imagine you are in the states... but in canada i like a beer called black ice... or maximum ice.... anyways that is excellent news ... i'm pleased to hear it.... i'll check out that company you mentioned... do you know if they take paypal.... almost bout a bunch of stuff from tigerdirect.... but i'm going to wait till after christmas and catch some sales... take care



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T42p display lights for a couple of minutes through startup then goes dark

But fan still runs, and it sounds like the harddrive is spinning?


Do you have a VGA monitor available?
You can use a CRT type, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

1) Laptop OFF, monitor OFF, connect the VGA monitor cable to the left side of the ThinkPad T42. (DisplayPort)

2) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By factory default, the display should show on the external VGA monitor.
If not;

There are at least three display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY.

Press, and hold down on the Fn key, and at the same time tap once on the F7 key. The F7 key is the Display Toggle-Over key.

3) Good display on external monitor?
Problem is the video cable, or inside the Display Assembly.

Since the display goes dark after a couple of minutes, I can tell you the problem is the screen Inverter, or Backlight.
(Inside the Display Assembly)

90 PERCENT OF THE TIME the fault is a bad screen Inverter.

An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED's.
(Light Emitting Diode)

The Lenovo ThinkPad T42 series of Notebook PC's, uses a single CCFL for a Backlight,

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

[Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height ]

A screen Inverter converts the power from the laptop, for the LCD screen, and Backlight.

(Older versions of backlighting that used a series of LED's, used a screen Inverter. Newer versions do not. For these replace the LCD screen)

A screen Inverter and an LCD screen are a MATCHED unit. Make sure you get the correct screen Inverter, or LCD screen, when buying.

Primer over.

One example of a screen Inverter for the T42's,

Pictorial guide for replacing a screen Inverter, in a ThinkPad T42 series of Notebook PC,

Lenovo Support link to the Hardware Maintenance Manual, for the ThinkPad T42 series of Notebook PC's,
(HMM. It is a Service Manual),

Click on the bold black subheading -
Hardware maintenance manuals
Then click on the blue -> [+] Click for files

It is a PDF file.
It may take up to 30 seconds before the first page comes up.

For additional questions please post in a Comment.

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Rim Blackberry 7 Quick Keyboard Shortcuts

  1. To change profile from normal to vibrate hold down on # from the home screen
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The fn key is the function key. I am sure that helps a ton. The fn key works like a shift key, changing the buttons marked fn, like volume, screen brightness, etc. The use is that you press and hold the function key, and press teh function button and then release both.
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You can increase the brightness by holding down the Fn key and then press the Home key, if you press the End key it will dim the back light.

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1) Boot your system in Safe Mode (if Windows is your OS) by pressing F8 after the usual "beep" provided by the BIOS after it detects all is fine. If it boots up, which takes a little longer than usual, then your system is probably Ok, although it may have a configuration problem.
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