Hi!
It did work! So I think what I have to come find out is that I can blank the display using the LCD setting. Since this conservation, I have also switched to the CHDK 1.4, and the camer model to a powershot D20.
I am now trying to experiment with the time setting, such at start at 17:00 and then end at 7:10. The reset hour is at 2 by the way. The test started and the odd parts are: it took its first shot an hour late (18:00), it took the last shot at 22:00 which is before 6:00, and the LCD didnt turn back off sometime around 18:00. does it stop taking picture because its a new day and then the reboot causes the script to restart? here is the log:
Sat Apr 11 08:23:36 2015; === Started: 08:23 ===
Sat Apr 11 08:23:36 2015; CHDK 1.4.0 d20 100b Mar 18 2015
Sat Apr 11 08:23:36 2015; CHDK version 140 okay
Sat Apr 11 08:23:39 2015; starting a new day
Sat Apr 11 08:23:39 2015; start time : 17:00 stop time : 07:10
Sat Apr 11 08:23:39 2015; switching to night mode
Sat Apr 11 08:24:54 2015; set LCD off
Sat Apr 11 10:00:00 2015; No Shot; tv:0.6; t72; a387; s795; b-432; V3963; T27
Sat Apr 11 12:00:00 2015; No Shot; tv:0.6; t72; a387; s795; b-432; V3991; T27
Sat Apr 11 14:00:00 2015; No Shot; tv:0.6; t72; a387; s795; b-432; V4004; T28
Sat Apr 11 16:00:00 2015; No Shot; tv:0.6; t72; a387; s795; b-432; V3995; T29
Sat Apr 11 17:00:09 2015; set LCD on
Sat Apr 11 17:00:09 2015; switching to day mode
Sat Apr 11 17:00:24 2015; set LCD off
Sat Apr 11 18:00:03 2015; Shot; 1; tv:0.6; t72; a387; s795; b-432; V3963; T27
Sat Apr 11 20:00:05 2015; Shot; 2; tv:0.6; t72; a387; s795; b-432; V3958; T31
Sat Apr 11 22:00:07 2015; Shot; 3; tv:0.6; t72; a387; s795; b-432; V3944; T34
Sun Apr 12 00:00:00 2015; starting a new day
Sun Apr 12 00:00:00 2015; start time : 17:00 stop time : 07:10
Sun Apr 12 01:50:01 2015; set LCD on
Sun Apr 12 01:50:01 2015; switching to playback mode
Sun Apr 12 01:50:01 2015; === Scheduled reboot ===
What I am looking for is just for the camera to turn off the LCD between shots at a 2 hour interval, from about 17:00 to 7 the next day for as many days as possible, while keeping the LCD off when not taking pictures in that interval. I am also using an external battery to elongate the battery life.
Thanks so much for your help, sorry to be a bother.