IICX Restore - Graphics Issue

[Steve Rieck]

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?

 

[Steve Rieck]

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]

 

[Garrett]

Has that video card been inspected after the capacitors were replaced? They leak in a terrible way and prevent proper functionality. You likely have a few broken traces which are preventing proper video output. Please post a picture of the card itself to help in diagnosing.

 

[Steve Rieck]

Has that video card been inspected after the capacitors were replaced? They leak in a terrible way and prevent proper functionality. You likely have a few broken traces which are preventing proper video output. Please post a picture of the card itself to help in diagnosing.

Good point. it looks ok at a glance but I'll check it under the microscope. Will upload pictures this evening. Thanks.