When you use the PC input on a Samsung television, the TV shuts off if no signal is detected.  The only easy way to turn the TV back on, is to turn the PC back on.   The hard way to get the TV to turn back on, is to turn the TV off, then turn it back on and send it a different video input command at a specific time.  

  It is driving me crazy having to explain to customers that they need to switch inputs before the PC fully shuts down, or make sure the PC is on if the TV won't turn on.   My "workaround" so far is to switch to the component input on my shutdown macro.  But that doesnt help if they shut off the PC before shutting down the system.  I guess if I used a control system that could trigger macros from a voltage sensor state change, then I could make a more reliable work around, but most of my installs use Nevo, and they don't have that capability.  

Anyone know if this auto shut off can be disable in a service menu or something inside the Samsung?  The Samsung troubleshooting guide shows this as normal opereration. 

These are the models I've been working with that I can remember:
LNT4671
UN46B6000
PN42B450


Solution:   Break off Pin number 10 on the vga connector that gets plugged into the TV.  If you are worried about damaging the cable, use a short male to female VGA extension, and break the pin off the male end.

Check the CEC setting in the display, then turn them off. Seems like this cause more problems than it fixes...

 isn't that only used with HDMI?  I should have mentioned, the PC Input is a VGA connector.

If you can't find any other alternative maybe you can find a cheap amplified VGA splitter to put inline.

Maybe it will still see something and remain on?

It's a shot in the dark and I have no clue if it will work.

many of our installs already have a vga splitter in line.  sorry to say that doesnt fix it :(

Are you making your own cables or are you usinc premade cables?
When you make your own you do not get the feedback/status from the monitor (your tv) so it will not shut down when the pc does. You also do not get any auto formatting but in most instances that is no big loss.
VGA 15 Pin Connector Pinout


Connector pinout for: VGA 15 Pin
VGA = Video Graphics Adapter or Video Graphics Array
Videotype: Analogue.
VGA (31.5 KHz - 640x480)
SVGA (35-37 KHz - 800x600)

15 PIN HIGHDENSITY D-SUB FEMALE at the videocard

15 PIN HIGHDENSITY D-SUB MALE at the monitor cable

Pin Name Dir Description
1 RED OUT Red Video (75 ohm, 0.7 V p-p)
2 GREEN OUT Green Video (75 ohm, 0.7 V p-p)
3 BLUE OUT Blue Video (75 ohm, 0.7 V p-p)
4 ID2 IN Monitor ID Bit 2
5 GND - Ground
6 RGND - Red Ground
7 GGND - Green Ground
8 BGND - Blue Ground
9 KEY - Key (No pin)
10 SGND - Sync Ground
11 ID0 IN Monitor ID Bit 0
GND=Color; NC=Mono
12 ID1 or SDA IN Monitor ID Bit 1
NC=Color; GND=Mono
Some systems only uses ID0 for monitor ID
13 HSYNC or CSYNC OUT Horizontal Sync (or Composite Sync)
14 VSYNC OUT Vertical Sync
15 ID3 or SCL IN Monitor ID Bit 3
Notes
Direction is Computer relative Monitor

References

Matrox G200 Flat Panel Add-On - User Guide
Monitor Pinouts
Category: Computer Video Connectors



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 so if I were to build my own cable to put inline on the back of each tv, would there be certain pin(s) that don't get connected?  or is just building my own cable, pin for pin, enough to disable the status?  Could I modify a premade male to female cable?

 theres nothing in the menu for energy saving or something like that?/  Thats typically where the auto turn off feature is.  Im sure you went thru the menus already but sometimes things go overlooked..

nope, the energy saving feature doesnt have an effect one way or the other.  

 how about some type of converter to change from vga to component or dare i even joke hdmi?  i know its not ideal but it may make the system work smooth and i'm sure you can get something relatively inexpensive.

Using bulk mini coax and 2 coax to db15c adapters should take caew of your problem. Extron and Liberty make them as well as many others.

that would open up another can of worms with making the resolutions work properly.  I'm already using the single component input on the TVs, and i'm not trying to throw extra parts at the problem.

I do use the HDMI input when possible to avoid the issue, but this current install has this PC distributed to a bunch of zones via VGA.  And some of my other sources that I have used this input for previously have been VGA only (navigation equipment, I work on boats)  

I was hoping that there was something in a service menu that could be changed.

Do you have a control system in place that could monitor the power state of the TV and issue whatever crazy string of events to get it back on properly?

when I do URC it isnt an issue, but Nevo that we do 90% of the time doesnt do externally triggered macros unless I create a widget that would poll the device constantly, but that would cause the remote to run really slow.

as it is, i do monitor the state of the televisions using Xantech current sensors and a nevo voltage adapter.  The problem is, that the TV doesnt totally turn off, it is in a standby state from the PC being off, and that it is still drawing enough current that the current sensor thinks the TV is on.  I wish I could adjust the sensor to tell the difference between Off and Standby, but I have a hard enough time adjusting them to tell the difference between on and off, especially on the LED televisions.  If I did happen to get it adjusted to tell the difference between off and standby, I wouldnt trust it to work reliably over the course of time.

Any reason you cant leave the PC on all the time? Maybe have them only shut it down when the boat isn't being used.