Common Faults (Amiga 500)

4min
Below are some quick tips on where to typically look if you encounter specific bugs or issues.
These are not definitive answers, and you can use the other articles on how the system works to more accurately diagnose problems, but still, this is a great first place to look.
Sync Signal then Black or no screen
If you experience the console locking on and detecting a sync signal (so the TV realises there is a signal) and then either going to solid black screen or no signal (losing sync) it could be the CIA chips.
Black screen then Pink, then Green
This is typically bad U12 or traces between it and 68k/Gary/Agnus
Black screen then no signal
This is typically a bad U10 or traces between it and 68k/Gary/Agnus.
However black screen could be almost anything on the en
Green, Yellow then Yellow / Bright Yellow screen
If using the diagnostics ROM, you will set of screens typically with a bad U10 or traces between it and 68k/Gary/Agnus.
Flicking Csync / No signal

This is typically a bad U11 or traces between it and 68k/Gary/Agnus
Green screen

Often meaning the lower RAM is bad, it can also be anything on the data path, such as a bad U13 or traces between it and 68k/Gary/Agnus
Flickering Red then solid Blue, then red/black line screen with flashing green border

If using the diagnostics ROM, you will see this set of screens if you have a bad Paula.
Jumpers (Amiga 500)
Basic Usage (Amiga 600)