Toshiba satellite l500d amd series

So hello to eeveryone i am new here so i don't know if this is the right section to ask for this...

I took a laptop TOSHIBA SATELLITE L500D AMD SERIES from a friend that didn't need it any longer, the laptop didn't start to be excact the screen staying black the lights are turning on but the screen not, i give it to an expert to fix it he told me tha the problem was the motherboard so we changed it then still didn't start the screen again he told me that the prossesor has problem too so we changed it , after that i was sure that it will be ok but not the laptop still didn't start the screen on and the problem told me that was the ram so we changed but again nothing... after that i took the laptop i payed him 200 $ and the laptop still cant start the screen on.. i connect it with my tv to see if there is a fried screen but nothing... i sure that he changed ram - motherboard and prossesor but still nothing...
Please let me know your thouhts about that cause i gave 200$ and i am not gonna throw it now.. i have no clow what the heck is the problem after all that..
Thank..

 

So there is 160 views and no answer..??? That's quite odd I think...please there isn't there someone that can help me..??

 

I am currently looking into this problem & if i find a solution i will let you know.