No video sync found on LCD monitors composite input.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Connecting video output to composite video input on LCD monitors results in 
no video (no video sync found).
2. Connected to CRT TV/Monitors works fine.
3.

What is the expected output? What do you see instead?
Expected to see the DemoNTSC sketch output. Instead there is no video sync 
signal found.

What version of the product are you using? On what operating system?
TVOutBeta1
DemoNTSC sketch
ATMega328p @ 16MHz
Arduino IDE v1 on linux.

Please provide any additional information below.
The TVout library works great on every CRT TV or CRT monitor with composite 
video input I have tried it on.  The challenge I am having is with modern LCD 
monitors.  Every LCD I have plugged into has resulted in no video sync signal 
found.  Any input you may have would be useful.  I have seen some articles 
describing the use of diodes to the video tip and also the use of 75ohm 
resistors grounding the signal input.  I am not sure if these would apply to my 
situation. Thanks for your time.

Original issue reported on code.google.com by woo...@gmail.com on 23 Apr 2012 at 12:27

[GoogleCodeExporter]

Hi, you did something about modern LCD monitors? the diodes works fine?

Original comment by macnad...@gmail.com on 5 Aug 2015 at 3:22