Question about HP Pavilion zv5235us PC Notebook

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HP notebook screen/hibernate switch

Hi,
System starts normally then lcd blakccs out. works fine with external monitor and 'blinks' when I push 'sleep mode' button.
Is there a fix?

Thanks.

Posted by on

  • bluespirit Apr 23, 2008

    Hi,

    Thanks, but I've been told that it is the button that puts the system into sleep mode. the lcd works for a few seconds when I push the button, then goes black again.

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  • 103 Answers

You may have a bad inverter or LCD backlight CCFL tube. This is definitely hardware related.

Posted on Apr 23, 2008

  • Richard Wilbur Apr 23, 2008

    Well, if it truly was the button that puts the system into sleep mode, then it would not work with an external monitor. Your computer would most likely not even come out of sleep mode or if it did, when you fiddle with it, it would go right back to sleep and windows would give you a message telling you that.

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Hp g60t went into hibernation last friday it wouldn't come out of hibernation so i had to hold in the power button and shut down. laptop turns on but no video now the screen stays black. i tried a reset...


This issue could be due to presence of static charges or internal hardware malfunction of the notebook. To isolate the exact cause of the issue, perform the steps provided below.

Step 1: Hard Reset

To perform a hard reset, please follow the steps listed below:

1. Unplug the AC adapter from the notebook PC and remove from any port replicator or docking station.
2. Remove the battery from the notebook battery compartment.
3. Press and hold down the power button for about 20 seconds.
4. Insert the battery and plug the AC adapter back into the notebook PC.
5. Press the power button to turn the notebook PC back on.


This will discharge the static charges from the notebook. Now turn on the notebook and check for the issue. If the issue persists, then remove and reseat the memory modules of the notebook and check for the issue.

Step 2: Remove and Reseat the Memory Modules

You can refer the service manual provided below for information to remove and reseat the memory modules of the notebook.

http://h10032.www1.hp.com/ctg/Manual/c01602064.pdf

Refer page no: 52 & 53
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Further, if the issue persists after performing the above steps, then the issue could be due to hardware malfunction of the video card or defective LCD display screen of the notebook. Hence, I recommend you to connect an external monitor to the notebook and then check whether the display works fine on external monitor or not.

Step 3: External Monitor

You can follow the steps listed below to connect an external monitor to the notebook.

1. Turn off the notebook.
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4. Press the Power button to turn on the computer.

At this time, please follow the instructions mentioned below for switching the display to the external monitor:

The notebook's video card supports three modes. Built-in screen only; external video only; and both on simultaneously (mirrored). If you're not seeing the image on the desired device(s), the notebook's video card is probably in another mode. Press FN + F4 to cycle through the display options: Notebook display, External monitor, both.

If you press FN + F4 once, the external monitor will display & there will be no Notebook LCD display.
If you press FN + F4 twice, the external monitor will display & there will be some shading on the Notebook LCD.
If you press FN + F4 thrice, both Notebook LCD & external monitor will display.

If the issue persists on the external monitor, then this could be due to defective video card on the notebook. However, if the display on the external monitor is fine, then the issue is with the LCD display panel of the notebook. In either cases, the notebook requires a detailed onsite diagnosis by a service technician.

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First we need to test if the problem should be the LCD screen. The easiest and most foolproof method for testing your lcd screen is to hook up the laptop to an external monitor. If the video output on the external monitor looks fine, this means that the problem is with the video connector, with your LCD panel itself, or with the circuitry that turns on the LCD.

Second we need to disassemble the laptop and find the video connector
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Disassembling the laptop to unstick this switch is an option, but sometimes you can get away with not taking it apart. Try lightly hitting that plastic switch. But wait, this isn't the only possible cause, unfortunately. Re-seat the other connectors and cables that are present around the LCD panel and the video on board (including the inverter)

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Let me know if you can access bios?

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