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computer powering on but no display

Discussion in 'Windows 7' started by singbah1, Jan 5, 2015.

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  1. singbah1

    singbah1 Thread Starter

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    hi; happy new year to all.
    sorry for bothering you at this time but i have a serious problem that will surely lead me to trouble soon and i need you help.
    i have a HP COMPAQ 6715b laptop that is been running window 7 that was brought to at my repairing shop with a broken screen to be replaced. it could power on at the time the owner brought it to me. i then took a working screen from another HP COMPAQ 6710b that had been working fine with the intention of ordering a new on because the customer needed his computer urgently. at first when i instilled the screen from the HP COMPAQ 6710b, it worked for about 3hrs and i then closed it awaiting the customer to come and pick it up. frustratingly when he came for it, it could no longer display.

    can someone please help me out of this problem


    regards,
     
  2. Phantom010

    Phantom010 Trusted Advisor

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    Maybe the power supply? Is the voltage good?
     
  3. singbah1

    singbah1 Thread Starter

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    Dear Phantom010, the power supply is working fine. i have been using the power supply since i receive the computer. i'm currently using it on another laptop. even if i plug it into the damaged laptop the power led lights up and the fan spanning but no display.

    thanks
     
  4. flavallee

    flavallee Trusted Advisor

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    I wonder if something broke or came loose when you closed the lid and then opened it.

    ---------------------------------------------------------
     
  5. singbah1

    singbah1 Thread Starter

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    Hi flavallee, i currently still have it closed as i did when it worked/Displayed previously.
     
  6. flavallee

    flavallee Trusted Advisor

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    I've never replaced a laptop screen, so I don't know what's involved in doing it.

    My comment was just a thought.

    -------------------------------------------------------
     
  7. geek117

    geek117

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    Are the two screens the same part number / compatible? Did you swap the screen inverter as well, or just the display? You could try swapping out the inverter as well (should be a slim electronic board mounted just below the LCD in the top cover, which the LCD plugs into), and see if that returns the display to operation.
     
  8. geek117

    geek117

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    Possible cause, yes. But seeing as how the display was just swapped I would think this is a highly unlikely scenario.

    Usually in a situation like this, it could be:
    • Power
    • CPU
    • RAM
    • Motherboard

    There are other possible causes, but these are the major ones.
     
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