IICX Restore - Graphics issue

[smrieck511]

I recently got a IICX DOA from eBay. Recapped the logic board, graphics card, power supply and floppy drive. Cleaned it up, put it all back together and thankfully got a nice boot chime with no issues other than the fact that I'm just getting a blank white screen on the monitor. I noticed when I plug the monitor in NOT connected to the graphics card I don't even get the white screen (just a black screen) so my assumptions at this point are the logic board is OK and the issue is on the graphics card. My instinct says it could be bad VRAM chips? In other words it's trying to do something but it can't even get itself to 4bit/16 colors. Am I thinking the wrong way here? Anybody know of anything obvious with a BCGM0322 high resolution display video card? is it at all possible there could be something on the logic board causing this instead of the graphics board?

 

[smrieck511]

What is this heresy ChatGPT is talking about?? Could there be any truth to this? never heard of such a thing. it's true, I haven't attached a startup disk yet. If all was working correctly, I should expect a cursor and flashing ? ... shouldn't I?
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Your suspicion about bad VRAM chips isn't out of the question, but there are several other highly probable culprits before assuming the ⁠BCGM0322 High-Resolution Video Card is dead: [1]

• No Startup Disk: The system gets past initialization, chimes, fails to detect a bootable floppy or SCSI drive, and halts. This often defaults to a solid gray/white screen on older Mac OS versions instead of the blinking question mark. [1, 2]

 

[Durosity]

I wouldn't trust any AI answer when it comes to vintage stuff like this. It'll often spew a lot of hallucinated garbage because the topic is niche and it really doesn't have any training on said topics.

Do you have an alternative graphics card you can test it with? Just because the screen displays an image doesn't mean that the GC is actually outputting anything meaningful. Also have you tried the GC in the other nubs slots?

On the flip side, do you have an alternative screen you can try it with? It's entirely possible the card is working but the screen can't process the image correctly.

Have you tested the voltages that the PSU is outputting? It's plausible that they're a bit outta spec and that's throwing the card into an error state.

Finally do you have a hard drive to put in it? I wouldn't expect it to relate to the issue chatgpt said as realistically the video should be initialised before the OS even boots, but it'd be interesting to see if the HD makes sounds to suggest the Iicx itself is actually booting or not.