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How to use SCART for our hobby
lettuce:
The Toshiba Tv im using only goes into standby when you turn it on via the plug
Zebidee:
--- Quote from: lettuce on May 23, 2008, 05:42:46 am ---The Toshiba Tv im using only goes into standby when you turn it on via the plug
--- End quote ---
OK, sorry for my short response earlier, but strictly speaking NO is the correct answer to your original question. Single power switches for cabs are covered in many other threads on this forum and there are several different approaches, for which a dual-post single-throw switch (as Level42 suggests) is a possible option in some cases. However, I won't go into that here.
Get ready for a long post here - sorry.
Different TVs are, well, different. So you have to work out what works for your TV .... which is easier said than done. Here are some things to try.
1) If you can figure out how to access the service mode of your TV, you *might* be able to set it so that it can automatically come on when you apply power. Service mode, as the name suggests, is designed so that only technicians can get to it. Generally you need the original remote, and instructions from the service manual (the one techs get, NOT the user manual supplied with the TV). To further complicate this, service manuals are generally not made available publicly, only to registered techs. The reason for this is because you can completely screw the TV up through making wrong settings in the service mode, so be careful.
2) If you have the remote, try turning the TV off with the remote and then cycling the power off/on. Then, when you turn it on, it might come on 'fully' (if you are lucky). Some variation of this theme might work for your TV.
3) Some SCART TVs will come on into AUX mode if you have 12v applied to pin 8 (as Level42 suggests).
4) If all else fails, you should be able to get the TV to come out of standby by pressing a channel button and/or the AUX button (perhaps labelled TV/AV). A pain in the bum if you want to have a single power switch for your cab, but there you go. If this is the case, and you are handy with a soldering iron, you could connect the button up to a momentary switch (eg standard arcade button) near your power switch, and press it just after you apply power to the cab.
Some power switches (including most standard TV power-on switches) include both a momentary switch (for signal voltages) as well as an always-on switch (for the mains voltage). If you rig up an external power switch to your cab using one of these combined switches, then you *might* be able to use it to send a momentary signal through to your channel and/or AV button as you power the cab on. I say *might* because you may actually have to wait for a second or two for the TV to power on before sending through the momentary signal to switch channel/AV mode, in which case you'll have to find another solution, perhaps involving a small capacitor (takes time to build up charge and therefore creates a delay before passing voltage through) or a relay.
lettuce:
Thanks for the indepth info. I do have the service code for the service menu, but i dont recall seeing anything to do with 'auto power on' etc. I have one of those power safe power strips, so when i turn the PC on it powers up all the other compliances that are connect to the power strip. as said when using this it just puts the TV into standby and not actually turn it on, but it does automatically go to the AUX channel which is a help. Is their a chance of blowing my TV up if i do try connecting a 12v current to pin 8 on the scart plug?
Zebidee:
--- Quote from: lettuce on May 23, 2008, 01:02:39 pm ---Is their a chance of blowing my TV up if i do try connecting a 12v current to pin 8 on the scart plug?
--- End quote ---
No - it is designed for this. But you should also ground the 12v to pin 18, as shown in the diagram Level42's original post.
--- Quote from: lettuce on May 23, 2008, 01:02:39 pm ---... it does automatically go to the AUX channel which is a help.
--- End quote ---
However, it looks like you don't actually need to bother with it.
lettuce:
Hmm, just took my scartlead apart ( i didnt mod it, i bought it) and pin 8 on the scart plug seems to be already soldered up to a yellow wire from the vga plug, which also has a resistor soldered from pin 8 to pin 16??. Does this mean its already having a 12volt supply to pin 8??
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