Lenovo E535 blank display but works with external VGA

I have a Lenovo E535 where the LCD display is completely blank. It works with an external screen connected to the VGA port. Using the F6 key to toggle between displays makes no difference. The AMD Vision Engine Control Centre only detects the external display. The Lenovo hardward tests do not detect any problems with graphics.
So I thought it must be a problem with the LCD panel itself and I have replaced it. The new one does not work either (so that was a waste of money!)
Does anyone have any ideas on what to try next?

Welcome to the Lenovo Community !
Have you tried booting the computer into the BIOS Setup to see if there is a screen display? That would circumvent any operating system related problems.
Other possibilities...... Bad video cable. A used one on eBay would be a cheap thing to try. Less than $10 (U.S.) Especially if the laptop you are working on had loose hinge problems or is frequently opened and closed.
A bad LCD replacement is another possibility.
Owner & Operator of the following:
● Lenovo Ideapad Z570 w/ Win 7 & Win 8.1 Dual Boot ● Lenovo Yoga 3 Pro w/ Windows 8.1 ● Toshiba A75-S206 w/ Win 7
● IBM Thinkpad T-23 w/ Win XP ● IBM Thinkpad T-22 w/ Win XP • As well as multiple desktops dual/triple booting XP, Vista and Win 7.
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