I have picked up a 130 XE but I am not getting any video output (from the monitor socket).
Luckily most of the key ICs are socketed and the CPU has been tested and is working. I have dropped in a new ANTIC and GTIA but still getting no video output.
Have checked that there is 5v across Capacitor 2 and 5V also seems ok on the chips.
Unfortunately the memory chips are not socketed - would the computer still boot up if memory chips were faulty - would be surprised if they are all faulty. Using the on board memory test would identify problem chips.
Any suggestions on tracking down the culprit part(s) - capacitors look ok from a visual check. I know the keyboard isn't 100% but my other 130XE boots up without keyboard connected (alas its components are not socketed so cannot swap parts to eliminate the good from the bad).