Question about Compaq Presario CQ40 Series Laptop Charger (1300679LMD0015542)

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My keyboard and touch pad compaq presario cq40 not working i try to reinstall keyboard and touch pad but it still not working ,and then i remove to put new keyboard but it still not working at all..... so please help me....thank before na!!!

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  • Compaq Master
  • 7,627 Answers

You tried to reinstall the keyboard and touchpad hardware parts? Have you had ANY damage? Spill? OS upgrade? If you replaced the hardware is the ribbon cables connect properly?

Posted on Apr 27, 2013

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Posted on Jan 02, 2017

  • 38 Answers

SOURCE: touchpad of my laptop compaq presario cq40

If you have searched for the driver and it is still not working then it is most likely a hardware failure and will need to be replaced. I recommend contacting compaq.

Posted on Mar 06, 2011

  • 2567 Answers

SOURCE: I haveMy compaq presario CQ40

This is usually a sign of either a bad LCD screen cable, a bad LCD screen, or a bad display adapter.
If you connect an external monitor & you get a picture without these red horizontal lines, then your display adapter is OK.
Diagnosing a bad LCD screen cable or a bad LCD screen requires that you disassemble the LCD screen panel, & swap them one at a time with a matching part. This way you can identify which part is causing the problem & replace it.

Posted on Sep 02, 2011

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