Everything is together now.
The background static over the pro speakers is still annoying, but far quieter than before the BRIX was grounded.
The screen artifacts are pretty much gone, but still there on certain shades of grey/black, not a problem as they're so rare!
I've just set...
Sadly I'm going to have to call this project a failure for now.
I've spent days trying to get everything to work, but to no avail.
The arduino will now just switch the audio output from 3.5mm to the internal amp. Nothing else.
The BRIX board is grounded and the audio ground lifted via a...
Thanks MacTester, I'll get your fix implemented tomorrow.
I've mostly finished the acrylic board that will hold all the new components. Most things are attached via small 6mm standoffs, which are in turn screwed into M7 nuts melted into the acrylic.
I found there wasn't enough...
The original 3.5mm headphone is now working with jack detect, switching the audio from the internal amp via the relay pictured. I picked up the 4.5v versions as someone was selling them substantially cheaper than the 5v versions, I don't see why running it at 5V should...
Took the iMac LCD apart as a last ditch attempt to see what was wrong, more for interest than any hope of revival.
It turns out there's a fast acting SMD fuse just after the 3.3v line in on the LCD PCB. Checked it, and there was no continuity.
Jumped it with a thin piece of wire, and the...
Thanks Kiwi, your help, as always, is much appreciated!
I've managed to source a 17" from a friend that I'll be collecting sometime this week, so the project is back on, and better!
The extra time has allowed me to finish the Tarkus speakers
Just need fully routing and...
Everything was soldered up and complete, connected it all up, and without setting the downconverter correctly, I sent 12V to the LCD panel accidentally for a minute or so (expects 3.3)
Can't get an image to display at the moment, but the display still reports as 'iMac' in System Preferences...
All your mods are fantastic, it's really good of you (all) to share and document everything so well. I'd be clueless without it all.
I do have a question or two for you though!
On the PSU connector, am I right in thinking that the PNP simply inverts what an NPN would do...
I've soldered up the 2.5mm Pro Speaker connector to the TA2024 (same chip as original iMac) amplifier (eBay special). All works, but soldering isn't fantastic. I nabbed a fine tip temperature controlled iron for the rest of the mod.
Sound quality isn't as rich as via the original...
Thanks Kiwi, that makes sense, a much neater implementation.
Code is coming along nicely, I've got some ideas for automatic speaker/line out switching using the arduino; just waiting on some relays to arrive now
Looks like I'll have to scrap the internal DVD drive if I wish to reuse the original PSU
There just isn't the space for the BRIX
Or I could buy a new 12V supply like this: 12V 6A Amazon
On another note, I've written the code to detect the LED status. It works OK for the moment...
Hi Kiwi, thanks for the reply!
Sadly the BRIX is very basic - no headers, and only a single blue LED. I'm stuck with the current behaviour.
This is the first time I've used an Arduino, so I'm still trying to get my head around the excellent sketches yourself and Mactester have written. I'll...
They're the original standoffs the G5 used for its' own motherboard; you can snap then off, then reglue to match up with an mATX board.
It's far, far easier just to get some pre-cut trays from The Laser Hive! I can't praise them enough.
SMC is now soldered up, just a few more headers to add. This is identical to MacTester's SMC, albeit with 1 fan header and no tach feedback. So of course, thanks to MacTester & Kiwi
Now the backlight won't start, it just occasionally flashes ... I'm hoping a switch to proper dupont...
It lives! ... Well, it says "Grub." on the screen ...
Apologies for the photo quality but I left my camera at a family member's house ...
4 hours to work out that the 3.3V line to the screen required me to hold it tightly against the ATX connector to work ... I'll have to come up with...
The DVI Molex connector arrived - I've stripped the iMac only to find a completely different wiring colour scheme to before. The black LCD cable data channels are the same as the 17" 1/1.25GHz models, as are the Clock-EDID, Data-EDID and VEDID from the grey LCD cable.
The others, I...
With some form of high-side drive transistor, see here around half way down for an explanation.
All the below use P-Channel Mosfets
So switchmode is ideal, but I can't find enough documentation to comfortably build something.
When the arduino...