Question about HP COMPAQ 7540 CRT Monitor
My moniter shows black screen but sound comes from external tv tunner card .
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Posted on Jan 02, 2017
Since the laptop works on the external monitor, then it would be safe to assume that it is only the L:CD display part that is the issue. Often LCD display (of laptops) are working but only that you can see the actual display. One way to verify is to shine a flashlight at an oblique angle to the screen, semblance or part of the desktop could be seen. If the desktop could be seen (albeit very very dark background) then it could either be the CCF Lamps (cold cathode florescent) or the inverter that powers the lamps.
Often, the defective component would be the inverter. It is relatively easy to replace the inverted. It is sometimes more difficult and challenging cracking open the casing of the display panel of the laptop than replacing the inverter. Additionally, inverters are readily available online. It is also not surprising that inverters for other brands/models would also be used in your Toshiba.
This would be a good place to start for inverter boards. This is a nice tutorial if you are considering a DIY.
In some worst case scenario, it could be the video interface or even a loose/open flat cable from the laptop's main body towards the LCD display panel.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on May 08, 2008
i 100% agree with you. i found out that my notebook is one of the recall product from HP. I sent it in for service. A week after the repair, the same problem is back again. So I call HP and they said that I have water damage on the board. I am 100% sure the notebook is no where need any liquid at all time. So they tell me if I want, they can fix it for me for $375. I would highly recommend everyone not to buy HP products!!!!!!!!!!!!!!!!!! I always have problem with HP products and I think they have the worst customer service of all. Once again, do not buy HP products!!!!
Posted on Sep 19, 2008
The display properties indicate the hardware is working, so it's likely just a setting.
On HP/Compaq models you will see a picture, usually on the F4 key that looks like a screen with two lines beside it.
You need to hold down the Fn key(bottom left) and then push the F4 key at the same time to cycle between LCD, external or both.
If it is a newer model, a menu will pop up when you do this asking if you want to duplicate the LCD on the external, switch to the external or extend the desktop onto the external. Select the appropriate setting or continue holding down Fn while pressing F4 to cycle between the settings to the one you want.
If you have re-installed the computer at some point with anything other than the factory recovery set this may not work and I will have to give you a longer set of instructions.
If this works please rate this as fixed, if not reply back and indicate what version of windows you're using and I will post the instructions for the "long" way.
Posted on May 26, 2009
i have solve the problem for my hp nx7300. mine used to show everything that should be shown on the screen but had the screen placed in a Conner so small. i solved this by uninstalling the monitor and unknown device drivers. i have then installed the unknown device as a blue-tooth adapter to avoid this problem recurring. hope this sorts out some people's problem. the other half screen with half completely not shown has to do with the cable connecting the monitor and the CPU. remember solving this for my friend by cleaning the connection port.
Posted on Sep 05, 2009
Suggestion- on my toshiba fn-f5 switches display modes, but to remove display connectors, you may have messed up your keyboard ribbon cable connection. it probably has a small sliding lock to hold it in place- if the lock isn't tight, your keyboard may not be recognized, which could mess up your display. Also, make sure your battery is charged and/or your power supply to your laptop is connected. hope this helps!
Posted on Sep 06, 2009
Testimonial: "thanks for the info but now trying to hardwire the laptop to the external monitor...wish me luck!"
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