Sir i have hp520 note book. screen display not work if i connect moniter then display ok . can you help me?

Check with the moniter by connecting the VGA Cable. is there any display on moniter if yes then laptop;s screen faulty otherwise motherboard issue.

this problem can occur cause of two cases 1 problem with LCD panel (replacement can solve) 2 power failure in side moniter (repairing moniter can solve)
thanx PLZ vote

You might have a faulty inverter board. generally can be bought for about 40 dollars

sir, your problem is your monitor, just go to the nearest service center.,

Thanks!

hey. there is a inverter in LCD that makes view brightly shinely so you can see everything on LCD. anyway. if the inverter breaks down you get black screen. even inverter is working you get blanc screen you need to check LCD DATA CABLE that it not possible to reach it for you. i advise you to get the Service if you have warranty

have a good day.

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Take the post (power on self test) disconnect vga cable and connect power cable if monitor shows no signal check signal cable massage then monitor is ok fault is in cpu. open it and clean the dust
by vaccum cleaner you will get the display again

1. cpu problem. why because of there is no signal output from cpu to monitor. the led blinking means there is no vertical, horizontal signals from cpu to monitor.

2. your monitor connected to another system.

3. neck board dry points.

4. cheak the display cable. 13&14 pins are horizontal, vertical signals.1, 2, 3 pins , R G B , 6 ,7, 8 pins R G B ground ( coaxiler cable used , meshed wire is ground )

monitor is making sound when on

Sir,
I hve read all above statement which shown as above. but in my case monitor take time to ON and display the screen, its take at least 45 minutes to start up and display the window screen. So please to send me solution about my Query.
Thank's

you need to change the setting in your power manager, as your laptop is trying to conserve power, you can change the settings, however you may affect your battery life.