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Could definitely do that too, just that the last time I looked at AEK I/II prices on eBay, I remember the prices of trashed units not being that much better than those of nice working ones (assuming it's because these models are a favorite of keyboard hobbyists too, who frequently salvage all...

AEK II should work just fine on the Mac SE; used that setup myself for a few years. I would try another ADB cable just to make sure that's not the problem, although I already have a feeling that's not going to change anything. I have an AEK II with the exact same symptoms (all LEDs come on, and...

Almost certain the big Lucent chip on earlier G4s, such as the Cube, is the KeyLargo IC... :(

My 9600 has a similar issue and the buzzing/whining sound comes from the power supply without a doubt, happens even when the speakers/fans/drives are all unplugged. Clicking the mouse, navigating through menus, etc. change the pitch of the noise. Same thing is much more noticeable in super cheap...

Yay! Probably wouldn't hurt to reflow the joints on other stressed components too just to avoid future headaches... connectors, transformers, anything with a heatsink. Same conventional wisdom you hear for Compact Macs. Agreed, since this seems to be a surprisingly common issue.

From the photos it seems like some of the solder joints on the power supply->motherboard connector have annular cracks. Couldn't hurt to reflow/add more solder to those just to rule them out, although both Torbar and Unknown_K reported that they'd reflowed solder joints to no avail. Failing...

That's great to hear! So we know the root cause of this nightmare now. Not really sure why it would be positive either. If you get a chance, it would be great to have a few pictures of the power supply board (mostly of the back) so as to figure out what might've gone wrong on it.

Multimeter should be in voltage mode, with the black/negative probe touching any of the pins labelled "GND" in the diagram Torbar sent, and the red/positive probe touching Pin 12. Make sure the probe tips are actually touching the metal parts of the pins rather than the rubber insulation on the...

Going back to this too just to rule it out: looking at photos of the Whisper card, it appears there's an EL2386 triple op-amp IC just below the AIO video connector. Given its location and the fact that it has a fairly high bandwidth, it's safe to assume it's what's driving the R/G/B inputs to...

Shooting in the dark here but based on this, I almost wonder if there's a grounding issue with the tray holding the motherboard. Are there any obvious grounding spring tabs or similar on the tray that could've gotten bent out of place? With the machine unplugged from the wall and the RGB cable...

Glad to hear that it seems to be a corrosion problem rather than a RAMDAC one!! Yes, a NuBus card would also bypass the on-board VRAM.

Found a photo I took of that problem, sorry about the moire. Note the blue dots on Doomguy's face and the yellow lines/dots surrounding all the icons. Also, since I know you have a deadline, the easiest solution may just be to find the NuBus riser for the 610 if you don't have one already...

Just to rule out anything easy: if there's any added VRAM in the slots, try testing the Mac without it. In the Q700 I mentioned in the other thread: the 68040 writes to the VRAM with the help of the DAFB (framebuffer controller IC). The VRAM is actually a special dual-port DRAM -- there are two...

G2/focus shouldn't be an issue. As long as they aren't arcing out at the splices I'd say you're good there.

Do you have another monitor you can test with? Judging by how the area of the screen outside the raster is also too green, I wonder if the green drive/cutoff controls on the monitor are out of whack. Not sure if you can adjust those in the on-screen menu on a relatively late CRT like that...

Checking 9 & 17 would be a good idea. Probably not much to gather taking DC measurements of the inputs. Yep! The MC13282 appears to just be the video pre-amp. On the AIO neck board, it actually seems that the video amp that drives the CRT cathodes is implemented discretely rather than being a...

Apologies if I missed something again but I haven't seen where bsteckler reported that a new PRAM battery resolved this. Since you have +12V at the molex connectors, if you feel comfortable doing so, you may be able to rule out power to the video amp IC by taking the shield off the CRT neck...

Will be interested to hear how the cabling in the chassis is laid out. If the rest of the system still seems to function, just without sound or clear video, I think the VRM module on the motherboard can also be ruled out. Flyback transformer should have no bearing on the sound either. I also...

Glanced over the G3 AIO service manual and what I've gathered is that the speaker cables connect to the personality card through the system's main wiring harness. Looking through some low-res photos of the Wings personality card online, it looks like the audio side of it consists of the main...

Since they both appear to be pull-down resistors for TTL inputs I think you're right that it would only stop those specific circuits from working (and the one around the sound circuit seems to be for the paddles only, so not much to worry about there). At the very least it won't damage anything...