One of my avalons simply wont turn on... At first i thought ihe power supply had it, but I replaced it, and still the same. Anyone had a similar problem ?
as you have obviously opened it, you should check all the cables from the control unit to the modules and back to the TP-Link WR703N board.
It's possible the TP-Link is dead, you can replace it with either a replacement off ebay or a Raspberry Pi.
Or your Control Unit board is dead (is your power supply switching on when you switch on the power button?)
If you have other working Avalon units, it's possible to hook one or more modules of the dead Avalon to the working system via USB (but it requires you to modify the software settings to scan for the additional modules)