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Broken address lines to the ASC are a common issue. I have seen a single broken data line as well but that is way less common. it's not totally impossible that this might as well cause your shutdown woes with 7.5 and above reading back values from the ASC for whatever reason which is going to...

This does already exist: https://github.com/DuPAL-PAL-DUmper Despite the "Dumper" in its name it does not dump anything. If you've just got a PAL and no idea where it was used and don't know what it did in a circuit you'll be having a hard time (that goes for all of the existing PAL "dumping"...

Cap goo leftovers around the sound area of the board. I had the exact same problem on my Portable. As soon as the sound chip was kicked into low power mode by the power manager (aka the 12V supply to the sound chips gets shut down) it started screeching horribly. I desoldered everything from the...

That's because it happens so quickly :P *Sidenote* I did overdo it in the video on purpose, it should be noted this was not going to be a tutorial of any sort. It looked rougher than it actually was. No pad was harmed in the process ;) Someone good at physics should some day calculate how much...

Did someone say twist and push? On topic, it's usually around 300-340C for normal slow everyday soldering. When I am doing assembly and want to do things very quickly I rise the temperature to 350-380C. Both with 60/40 solder.

They're active high logic signals, so it's either 5V or 0V. SV0 is grounded and always inactive. The other 8 volume levels are just formed by counting through all possibilities in binary: Volume Level | SV1 - SV2 -SV3 0 | 0 - 0 - 0 1 | 1 - 0 - 0 2 | 0 - 1 - 0 3 | 1 - 1 - 0 4 | 0 - 0 - 1 5 | 1 -...

Check the volume control signal lines between the ASC and the Sony chips. They'll either be open or you shorted them while replacing the caps in the audio section.