Perhaps you have experienced when your laptop suddenly does not display any existing screen , the screen remains dark and all the indicator lights like a normal  process just that the screen remains blank and does not show anything .
The first one we think is the damage of the screen or LCD , then the failure of Memory , Sometimes  we can reset the memory failure  by releasing it and clean it and put it back or replace it with a new one , but if it does not help and LCD  still not working then there could be damage to other parts .

Here I will share my experience when my BENQ R45 Joybook and LENOVO laptop is not able to display anything on the screen , it was normal boot process but the screen remains dark and still does not show anything even though I have been using my  external screen , until I switched on suspicion VGA chipset that does not work !!.

As you know , VGA chipset and processor are the two parts always work in hot conditions and required cooling or fan to cool it , but the less fortunate for VGA chipset  because not equipped with a fan as the processor , the VGA chipset  cooler mounted just aluminum heatsink . and if the VGA chipset  too hot then it will result in a loosening of the connection of lead that connect to the motherboard and result in no operation till vga chipset can not display anything on the screen .

 If your vga chipset is not burn'  ( like this are rarely found because there is basically boiling point lead that connects to the motherboard chipset vga is lower than the highest point on the ceramic heat shield available on VGA chipset , and motherboard laptops usually have a sensor that makes the motherboard stops working the current state of the processor in the above heat tolerance limits , the motherboard stops working then there is no power that is active , and that in fact the hot section parts will also stop working . ) then you just need to make sure chiset vga perfectly attached and connected to the motherboard , and once again this is not easy to do because the design of the vga chipset that puts lead to connect to the motherboard is located at the bottom , and you need a special soldering to remove or install it .So just make sure you find the chiset vga andd see if there is not burnt or charred

 Here I will show you how to repair it with  candle light ! ! Not remove the vga chipset and put it back ,  ( remove and instal the VGA chipset is called REBALLING,i will show you later )

prepare your equipment , open your laptop , remove the laptop motherboard in order to simplify , and make sure you find the vga chipset , turn on your candle , heat the vga chiset  of a candle flame , make sure you only heat the proper chipset vga on the part of the ceramics in the middle ! ! ! !

make sure you do not burn or heat the parts other parts around it , put the candle on the table and hold the motherboard  upside down and facing down towards the candle flame , and heat vga chipset for about half a minute , do not be too long because you will burn the components  around the  vga chipset .

Then when the chipset  still in hot conditions wipe it,clean it with a cloth and do it with a bit of pressure for a few seconds towards the  motherboard , it makes chipsets pressed.and ensure the lead in the bottom of the vga chipset will be back connected to the motherboard and reassemble your laptop .. you will see the screen now ...you can get back to work.

The HEAT is the biggest enemy of our laptops .. make sure to clean the fan and air ducts as well as parts of the inside of the laptop on a regular basis , and use the extra fan when using a laptop is a very helpful thing for a little cool down the temperature inside the laptop .

before doing this you have to make sure if the memory, processor and all of the cables connected to the LCD in good condition and working

The normal boot process, you can hear the hard drive is work, all the indicator lights normally, but the LCD does not display anything. and remains dark even though you have to connect your laptop with an external LCD .
that is one of the hallmark features that VGA chipset is not working.
make sure you didnt see a shadow image on the LCD, since the LCD does not display anything or just blank it can also be in the causes the death of your LCD backlight.

"As the repair costs the same as buying a new one, I chose'  to fix it ..
because  that will make us a little smarter than before isnt..??
LEARN it could be in any ways and the cost and time that we can always adjusted"

I hope this will help,,my apologize for my bad english.