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If it's booting and just has no video, I'd check the Molex plug that's on the logic board, specifically continuity of video signals that go to the AB. I have found a break there which resulted in the exact thing you show.

I don't have one yet, but am strongly considering it. Troubleshooting boards would be much easier!

Is this what you're looking for? https://androda.work/product/vga-adapter-for-macintosh-portable/

Wow... great catch. I just confirmed by looking at an original photo and decoding the color bands. I have parts to build a neckboard of my own but haven't started yet. Guess it's time for another DigiKey order!

The board itself is clean (no corrosion), and I did insert/remove the headphone plug a few times to see if that might clear things up. No luck. I guess next step is break out the multimeter and see if the contacts are closing inside the connector when headphones aren't connected. This is where...

So "no sound" might be a stretch - there's no sound coming from the internal speaker. Headphones play just fine. I have tested the speaker itself, and even tried installing a different version of Mac OS hoping it was a software issue. What's weird is that there isn't even a startup chime, so I...

C6 looks a little funky... I'd check it out to make sure it isn't shorted. Wouldn't want to have anything blow up the first time you try things out.

Nice work diagnosing the RAM issues! If it were me, I'd remove the accelerator and make sure the logic board will get you to a flashing floppy disk. That way you know the majority of the logic board is in a working state.

You bring up a good point here. I've done some serial diagnostic work on a Portable but didn't even think to try the IIsi. I know it's supported - just need to figure out syntax for the right tests to run. Unfortunately a lot of this isn't super well documented. I'll post back though when I have...

When you say "video controller chip" you're talking about the RBV chip at UA3?

Checked this as well - good continuity just missing some solder mask is all.

Yup, all toned out just fine. I did just purchase an interposer SIMM from zigzagjoe. I might try it on the IIsi for giggles and see what the bus is doing upon power up.

Agreed - don't open up an otherwise working machine! Not worth the risk, and I don't think that would give us any more good information. I have verified that a working 5300c display will show a legible image with either the VGA or sVGA display cable. Maybe if you aren't willing to sell the...

I have tried both the 821-0083-02 / 632-0069-02 VGA cTFT cable and the 821-0085-02 / 632-070-02 SVGA cTFT cable. Part number on the LCD is LTM10C036, which should be correct for the 800x600 ce model. I do have a working 640x480 active matrix panel from a 5300c, and it works with both my cables...

I've been trying to source a replacement panel for my 5300ce for around 6 months now. I've tried five (no joke) panels from China, and they all display horizontal lines like I have pictured. No discernable image ever appears. The panels themselves are a little questionable looking, but I find it...

Nothing yet. I got too frustrated and had to walk away from it for a while. I should revisit it again - just need to come to terms that whatever is wrong probably won't be "easy" to diagnose!

Nice! I’ll give this a shot for making new images.

Well, here’s one way that works (as long as you have a good CD to start with). Using the copy command in Toast 5, I was able to make a bootable disc. Unfortunately I’m still unsuccessful at burning my own image or an image of a disc, but I guess that’s a problem for another time. One of these...

I did actually try that, but Disk Utility didn’t want to make an image from the device. However, if I select the volume itself, I’m able to create the image (See screenshots). Maybe I need a different version of Disk Utility?