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Thanks. How can I test chip 1B and 1F? If I understood it right, the test command would look the same for both, wouldn't it? *S *A *4 *0 00000000 *1 0000FFFF *T 000600010000 *R Edit: And more importantly: How could I distinguish which one might be defective?

@SuperSVGA Would you have any insights on how to identify the bad RAM chips?

So my Portable was re-capped and now boots with this sad Mac error: 00000003 0000FF00 Following the instructions in this thread I followed the diagnostics checks by connecting the Portable's modem port to another Mac and ran Zterm with the following commands and results in an attempt to...

Thanks, that worked. I'm attaching a picture of the set-up for future generations :-)

Where and how did you connect Ground and PA0 (Pin 2 of the VIA)? I‘m trying to get the diagnostics mode working and am stuck at this point. Also, did you take a standard serial cable to connect the two Macs? I have one that works fine for a Mac-to-Mac LocalTalk connection and will take that one.

Congrats to finding and fixing the issue. I get a similar error, though it's 0000FF00 in the second row. Which RAM chip could that be?

Thanks both for your responses. I might have found it. It’s R6 and the via connecting to it is just above the defective cap‘s pad.

The + pad of the C6 capacitor came off. I checked the logic board schematics and noticed it would connect to a resistor. However, that resistor does not have a lable. Does anyone know where the pad would connect to?