devo 7e not working

hello everybody, i have a problem of my devo 7e it's not working at all, when i push the power button it just click but there's nothing on the screen, what should i do? i have new battery on it. please help. thanks

Did it work ever before? Which firmware is installed - stock Walkera or Deviation? If second: which version?

yes it's working before for the last 20 days then died when i switch on i can see a very dim backlight on the screen like shadow of it, i can hear also the click sound when switch on, i believe it's deviation already 3.0, hope you could help, TY

Just to find out little more could you try connecting usb lead then power Tx while hold 'Ent' key, so can see if deviation is running it should show Flash drive.

just right now sir i try it and nothing happen i can't see either the icon in my computer as will as the icon in the devo 7e tx nothing. help please

the backlight of the screen i can see a dim light

sir vlad_vy if the hardware problem, what should i do, do you any procedure to do?

That's unfortunate.
Lets start with detailed picture of the internals. And hope you have a multi meter.
Oh did you use lipos to power Tx and 2 or 3s if so?

i use 4 AA rechargeable batteries energize 6.40v and i try normal 4 AA energizer that's new and i can hear the click and very dim backlight on the TX

thank you guys i'm working on it