Read the statement by Michael Teeuw here.
disable NO signal message
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 @bhepler , But when i want to keep my raspberry always online i have to do something about this situation, it is possible to put new firmware on the TV but i can`t find any modding software thats easier then Hexa codes to configure… with an LG tv its possible because u can get the firmware software download on a USB drive from the TV, but i want to use a tv that i don`t use anymore.(Recycle project). 
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 @aboulezz said in disable NO signal message: I faced the same problem with my LG screen but found a work around. Step 1) I used wiringpi.com and modified the simple blink example to send out just one impulse: #include 
 int main (void)
 {
 wiringPiSetup () ;
 pinMode (0, OUTPUT) ;
 digitalWrite (0, HIGH) ; delay (200) ;
 digitalWrite (0, LOW) ;
 return 0 ;
 }Step 2) I modified the PIR modules’ node_helper.js so within the functions activate / deactivate don’t enable/disable the HDMI output but execute my compiled ‘blink’ command. Step 3) I hard - wired the singal pin to the (with resistor / transistor) to the screens power-button. done :-) Can`t i use this instead and make my raspberry a longer time to get the HDMI port visible to the TV, ore do i get the message still when giving the HDMI port a command to show himself. (If u know what i mean). 
