hjalfi
Experienced Member
My gut feeling, based on lots of very very similar reports, is that the PSU circuitry in these things is trash.
At this point I'd be very much inclined, if I could find enough schematics to identify where the PSU circuitry is connected to the power bus, to just cut the lines and replace the whole module with a modern, very small power conditioning board. But the whole thing is such a maze that I haven't found where to do that. Finding the +5V line is fairly simple as it's routed to all the ICs but there are some other, odder voltages used by the LCD.
At this point I'd be very much inclined, if I could find enough schematics to identify where the PSU circuitry is connected to the power bus, to just cut the lines and replace the whole module with a modern, very small power conditioning board. But the whole thing is such a maze that I haven't found where to do that. Finding the +5V line is fairly simple as it's routed to all the ICs but there are some other, odder voltages used by the LCD.