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One "On/Off" Switch to Power Them All
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Zebidee:
Oh, if the TV has a momentary switch then the PC will need to be turned on with a momentary switch signal (eg the soft power switch connected to ATX m/board).  But if the TV switch is alternating on/off, then you should also use an alternating switch for the PC power.  In this case, use the alternating "PSON" signal wire from where the ATX Power supply itself connects to the m/board (as I described in my earlier post on this thread).  This way you have a 2-way ("dual gang"?) switch option regardless of how the TV powers on.
advocate:
Instead of Rewiring the Power Supply, Couldn't you Just use the Craftsman Auto Switch Sears item# 00924031000 Mfr. model# 24031

http://www.sears.com/shc/s/p_10153_12605_00924031000P?keyword=power+accessories

You Plug your computer into the main outlet and plug your Monitor and other Cabinet Peripherals in the Accessory outlets (you can add a powerstrip).

I turn on my computer by either hitting the ATX Button or the Keyboard Key programmed in the Bios. When I do that the Switch Turns on All my other Computer Peripherals attached. When I hit Windows  Shut Down in XP, my computer Shuts Down and the Switch then Automatically Shuts off all Peripherals. Power is Maintained to the computer so that the ATX button or Keyboard Key can Turn it on again.

Just Extend your ATX Button or keyboard key  to the outside of your cab.

Your other solutions are ingenious, but I think that this one is easier.

Jacob
Zebidee:
Welcome to the board!

Unfortunately, the "Craftsman" doesn't do anything to address the need for a momentary switch to be pressed at the same time as power is applied.  Good to see another master-slave powerboard available out there though.

Since originally writing to this thread, I've setup a vertical cab with a 26" Loewe TV that needs a momentary switch pressed at the SAME TIME, or within about 1 second, of power being applied.  I addressed this by adding a second TV power switch, on the outside of the cab (at back).  I pulled an appropriate switch off an old TV that I was  throwing out. The cab still has separate power switches for PC & monitor, but I don't have to reach around inside the back of the cab to turn on the monitor now.

 :blowup:           Hey!  I just had an idea


While writing this post, I have realised that I have another possibility.  Use my new TV switch to apply 240v power to the PC instead of the TV, while still using the same switch to send the momentary on/off signal to the TV.  If i set up my PC to come on as power applied, and it is attached to a master-slave powerboard (eg the Smartstrip or the Sears one, or the cheaper & better one I got from Bunnings), then power will also be applied to my TV (the original switch is left ON), and the momentary trigger will turn the TV on!

The whole deal might rely on the person pressing the switch removing their finger at a leisurely pace.  I wonder about the small time delay (PC turning on, drawing current, master/slave relay circuits are closed on powerboard, TV gets power and ONLY THEN looks for a momentary signal on/off).  I know it all happens very quickly, but wonder if it would be quick enough.  Probably  :dunno

On balance, for this particular cabinet, I think I like having the separate power switch for my TV-cum-monitor.  Another feature of this great Loewe TV is that it powers off after a certain time (~5 minutes) without any video signals.  This means that if windows turns the video off after 20 minutes of no activity, the TV will turn itself off and save power/tube/electronics wear. And if that happens,  I can turn it on again with an easily accessible separate power switch for the monitor.

As I run Windows 2000 on this cab's PC, it is nice to be able to turn off the monitor without having to re-boot the machine (which takes about 1.5 minutes +)
BrentRadio:
This is what I use. They also make them with just one button.

http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200206724_200206724
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