Yeah, see I don't think that's what the error code means. What exactly is "chip 3"? Looking at both the chart on that site (and others) and Larry Pina's book, RAM chips are identified by grid: rows F & G, 5-12. You'll note that there is no "0003" on that table.
The fact that you have lines on your display sounds more like an analogue board problem where a leaky capacitor could cause all kinds of problems. And from what I know about them, they can simply start leaking from age alone or from a warm storage area (remember if it was in a box then it had zero airflow).
The thing that bothers me, is why would a RAM chip just go bad sitting there for 5 years? It is far more likely there is a problem on the analogue board. Of all the old Macs I've ever gotten, both dead and eventually failed, none of the problems have involved the logic board.
I would definitely give your analogue board the once over before I started tinkering with the logic board too much or taking a soldering iron to the RAM. In fact, looking at your collection posted on your website, I would swap logic boards with one of your working 512K Macs or Plus ... they are all interchangeable for testing purposes. If the 128K board works with another working analogue board and another logic board exhibits the same or different symptoms in your 128K then you know for sure.
The fact that you have lines on your display sounds more like an analogue board problem where a leaky capacitor could cause all kinds of problems. And from what I know about them, they can simply start leaking from age alone or from a warm storage area (remember if it was in a box then it had zero airflow).
The thing that bothers me, is why would a RAM chip just go bad sitting there for 5 years? It is far more likely there is a problem on the analogue board. Of all the old Macs I've ever gotten, both dead and eventually failed, none of the problems have involved the logic board.
I would definitely give your analogue board the once over before I started tinkering with the logic board too much or taking a soldering iron to the RAM. In fact, looking at your collection posted on your website, I would swap logic boards with one of your working 512K Macs or Plus ... they are all interchangeable for testing purposes. If the 128K board works with another working analogue board and another logic board exhibits the same or different symptoms in your 128K then you know for sure.