Question about IBM ThinkPad T40 2373 Notebook

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Why does my thinkpad blink on and then go black once I turn it on? The model is T40 2373

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Contact the Thinkline Technical Support in Atlanta GA

here is the number

THINKLINE: 1800-4267378

Posted on Jul 25, 2010

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To troubleshoot:
1) connect a video cable to an external display and use keys to switch to external.
2) If the display is visible on external but not on laptop shine a flashlight into the display from the front. If you see dim data but it is not back lit: it is the inverter or the ccl (backlight). If that is the case and yopu have a scope check signals and replace the defective part.
If no equipment change the inverter first, it is cheap and easy to replace.
If it is the backlight tradeoff a repacement used screen versus buying a ccl (not to expensive) but changing the ccl not very easy.

If there is no display externally and you do not see any data with a flashlight - then remove memory reboot and check post codes.

good luck

Posted on Jul 22, 2010

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Its having problem posting. You might need to have a replacement of the motherboard and power supply. you can contact IBM if system still within warranty

Posted on Jul 21, 2010

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Posted on Jan 02, 2017

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Program the code in:
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Re-lock the CBL button:
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