Correct, phones & PCs only support the 38kHz IR frequency everybody(!) else uses.  A (used, now discontinued) Logitech "Harmony Hub", using the old Harmony app, can shoot 455kHz by configuring it for whichever Beovision MX Logitech's website supports.  I used it with an MX5000.  It's annoying tapping on-screen buttons to change channels & volume, but they are there at least.  But the MX5000 had a round red button on the lower right corner, which would power the TV on as well as off -- provided you were satisfied to watch whatever it was last tuned to!  Not on the MX1500? I think you're better off buying a used BeoLink 1000, than a Harmony Hub -- or a Beo4, or even a new Beoremote 1 BT, though that's awfully pricey just to save an old TV that will soon need power supply repairs.

I vaguely recall that pressing the power button slightly causes the TV to turn on. This is some sort of emergency mode in case you have lost the remote. A further slight press gets it to start searching for channels. You could also try applying 5v to SCART pin 8 - this may turn on the SCART input.

Look here under 'Features' 'Emergency Operation'

Location: Warwickshire, UK

My B&O Icons:

BeoCenter-9500.png

Beoremote-Beo4.png

Beovision-10.png

Beotime.png

Beosound.png

Beosound-Explore.png

Beosound-Essence.png

Beoplay-P2.png

Beoplay-M3.png

Beoplay-H4.png

Beoplay-H3.png

Beoplay-Form-2i.png

Beoplay-Earset.png

Beoplay-A2.png

Thank you both for your answers. I've read in different places that some of the MX models should have an extra button to turn it on but sadly this one doesn't seem to have any other than the main button. I've also tried pressing the button gently but it doesn't even feel like the button was designed for being pressed in different manners. So I suppose I'm left with having to buy a replacement remote which don't seem to be awefully expensive anyway. Otherwise, could there be a way to make this work with an Arduino and a IR led? Or do you think I will face the same issue with the frequency being too high for what the Arduino can emit?

Oh interesting. I wish there were more details about this though, because I really can't find any other button on the set.

I had an MX1500 and just to warn you, don't get a Beo4. Mine could not be controlled with a Beo4. Stoobie.