Recent content by GibLP

Thanks @nathall for the reply - Apologies for the late response, I missed the notification in my email. Will poke around a bit more. Thanks

Hi All, Bumping this back up again. Well I've had some more time to debug my Color Classic Mystic (575 + VGA Mod). 1. Audio works perfectly through the speakers and headphone jack, but there is a high pitched background hum/noise present through speakers. 2. The background noise/hum goes...

Thanks, this is very helpful. I kind of wish the issue was with the AB as that only has a handful of components... Where would you start troubleshooting on this board? Replace the main caps? I've heard of removing the DFAC, cleaning around and re-soldering. Thanks again.

Thank you, that makes sense to exclude the amplifier section on the AB. What would be the most promising culprit on the LB: resistors, capacitors associate with the sound circuit or the sound chip itself? Thanks again

Hi All, Last year I converted a Color Classic into a Mystic (575 + VGA Mod) and there is this high pitched squeal coming from the machine. I originally thought it was the flyback transformer, but it's actually the sound circuit. When I unplug the speaker or plug headphones in the noise goes...

Hi All. Anyone know what pin 21 does? I by mistake severed it while trying isolate pin 20. Is it a simple signal wire that I could use a bodge wire to fix or is it something more important that requires a thicker wire? Thanks in advance.

Thanks @olePigeon, I saw that thread but that method is quite a bit more involved than the one I’m trying. Besides, I have a Rev D board and its not totally clear what changes need to be made for that.

I found another site listing a very similar mod: https://www.micromac.com/instructions/CC_Video_upgrade/index.html which keeps the diode intact. Only difference with this version is that it connects pin 20 and pin 3 instead of 20 and 24. Any idea on which is "correct"? Thanks.

Hi All, I'm about to perform the VGA mod (Option 1) on a color classic analog board and ran across a discrepancy with my boards revision: My board doesn't have J78 so the instructions say I have to disconnect (isolate) pin 20. However, at DD1, there appears to be a diode (M5C) where in the...

I just tried 7.1 on a Zip disk with the system enabler and it booted just fine. So I’m assuming something up with 7.5.3?

Hi All, I picked up an LC575 motherboard to go with my color classic. I've done the software mod, using ResEdit modifying the boot process from 21->10 for gestalt id 99. This seems to have no effect as I'm always getting a bus error. I can probably rule out hardware error, since I've tried...

Oh yes of course, I meant either to part it out or sell it as is. Thanks

For some reason, I'm not seeing a whole lot of junker CCs on eBay...

Thanks All… at this point I may just cut my losses and dump it as I’m not seeing that characteristic trinitron line. 😞

Thanks! I’ll give that a shot. Any idea what these horizontal lines every ~ inch are?