Need help with touchscreen

[Turnarcades]

I've already completed 1 touch-screen project but the other day I bought an ex-POS for the bargain price of £20 delivered. It's a Casio QT-8000 unit, which is essentially a tablet PC as the 1.2Ghz PC is integrated into the rear of the 15" touch-screen monitor. However, I took a chance as it came without any cables so am after a power lead for this unit. From online documentation I've discovered it's got a 110v power supply and requires a 19v power adapter. Simple enough yes, but I'm having difficulty finding one as it has an unusual power jack:




It's a great unit and I'm hoping I can get it up and running. It supports XP and was working when last tested by the seller so hopefully it will work out to be a great bargain. So, does anyone know where I can get an appropriate substitute power adapter in the UK or will ship to the UK?

[Franco B]

Can you open the unit up to see where the terminals go to? You may be able to wire directly to the back of the jack from a suitable PSU if you can't find the correct male jack.

I guess you will need a 230v PSU rated at 19v, if you found an original 110v PSU I guess you would need a stepdown unless it takes 110-230v. My touchscreen needs 60w, do you know what yours requires?

I'm not too hot with electronics so take everything above with a pinch of salt, or even better get an answer from someone who knows what they are on about. 

I just thought I would add my £0.02 in case it helps.

[enskpo]

I had to buy one similar to that for my Elo touchscreen.  Hard to tell from the picture, but is it like this?

http://cgi.ebay.com/New-Power-AC-Adapter-for-4-pin-tip,-19V-4.74A-90W_W0QQitemZ370179776267QQcmdZViewItem?rvr_id=&itemid=370179776267

or this?

http://cgi.ebay.com/Li-Shin-LSE0208A1965-19V-AC-adapter-4-pin-Sanyo-TV-LCD_W0QQitemZ350238940046QQcmdZViewItemQQptZLaptop_Adapters_Chargers?hash=item518bde1b8e

I found those on ebay from this Google search results page (200 more hits):
http://www.google.com/search?q=%224+pin%22+19v+site%3Aebay.com&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Good luck!

[Turnarcades]

Thanks guys. I would do that Franco but when it comes to wiring I don't like dicking around with power supplies and the like, so a hack is out the question this time round.

Enskpo - that's exactly the type I was looking for. After doing a search on ebay uk with your parameters I've found plenty of suppliers who do this, so I will pick one up from there.

[Franco B]

Ah, nice. That was an easy solution

[Hoopz]

I honestly just got a touchscreen via Fedex yesterday that has the same connector.  When I first saw your thread yesterday, I thought that it was an odd connector.  If you need any details off of the power brick that I received, just let me know.  Sounds like you have it figured out, but just in case.

[Turnarcades]

Thanks Hoopz, but I've already ordered one now that I hope will do the trick. It's actually for an Acer Aspire 1800 laptop PC but matches the specs I've looked at. I imagine the adapter specs will be a little different for this to other touch-screens as this is integrated with a PC so may have higher power demands than a touchscreen monitor on it's own.

If however it doesn't work out, I will contact you about the one you had.

[Hoopz]

Thanks Hoopz, but I've already ordered one now that I hope will do the trick. It's actually for an Acer Aspire 1800 laptop PC but matches the specs I've looked at. I imagine the adapter specs will be a little different for this to other touch-screens as this is integrated with a PC so may have higher power demands than a touchscreen monitor on it's own.

If however it doesn't work out, I will contact you about the one you had.

Cool.  I failed to mention that mine is for a POS also.  I wonder if that connector is used more often in those types of terminals?  I had another POS that turned out to be a different kind of POS but it had a regular PC power cord.

[Turnarcades]

So, the power adapter arrived yesterday and as crap luck would have it, it's not working. The power adapter box has an indicator light on to show it's working wen I plug it into the mains, yet the second I plug it into this system, the indicator light on the power adapter box goes off, and sure enough I can't turn the PC or monitor display on.

Is this system I bought just no good? I'd imagine if there was an issue with the power supply inside the PC it would just not turn on, but why would the indicator light on the transformer box of the power lead turn off when plugged in (even though the system power is turned off by the switch on the bottom)? The ac adapter I bought was 7.9A, not 5.5A as I later discovered on a sticker on the unit, but the amp rating being higher shouldn't be an issue should it?

Any help would be appreciated.

[Kevin Mullins]

The amperage wouldn't be a problem.

But I'd verify that the pinout is correct on the new power supply to match the touchscreen unit. Can have the same "connector", but possibly have the + and - crossing up which would cut out the power supply.

[Turnarcades]

Here's a quick diagram of the plug layout:



The top two pins are slightly wider apart than the bottom two (I'm assuming to make sure the plug is inserted correctly, along with the notch at the top of the circular metal rim), but on looking at the plug a moment ago, the two pins on the right (coloured black on the diagram appropriately) look a little scorched on the tips (not the shiny silver like the other two). I didn't notice any burning smell when plugging it in and the adapter does still work on another device I tried so it's still OK, but what can I do about connecting it to this system?

I'm really keen to try and get this system working but I hate messing around with power connections, so hacking a cable I had to order from overseas is not ideal. If no-one can offer a suggestion, are there any members here in the UK who're quite handy with things like this I could send this off to so they could have a look at for me?

[Turnarcades]

Shameless bump.