A little HELP!!

[aerostar]

With no incoming video you should have the NTSC the RPM and the NO SYNCHS DETECTED.

With a video signal coming in you should have NTSC and the RPM only on the screen and overlaying the incoming video picture.

I had reconverted by boards back to PAL, but have just changed just 1 back to NTSC and was using a PAL input for an incoming signal for test input.

I have got hold of a Raspberry PI which can be set to output NTSC so will try that some time tomorrow to see if it works as it should.

I wonder if you have your board correctly wired especially vin to vout pin 1 and 28 and no connection on vout2 pin 26, pins 20 to 23 grounded, pin 24 to 25 connected