Hi. Thank you for purchasing an adapter. As we already spoke on the phone, I'll just answer here as well so that others can see..
Because of the way the MPU board was designed, when the it is powered up the two LEDs come on automatically. The CPU has to execute a section of code to turn them off. So if they're on and stay on right from the start, it means the CPU is not shutting them off.
In the case of the 01a-LEDs test, the code simply alternates them to show activity.
If they don't alternate, then you need to find out why the code is not being executed. Possible reasons here are:
Inadequate power. You should have 5.1-5.3 volts going into the MPU board at the power connector, and at least 12v going in on the same connector.
--> 5v power runs the CPU and logic chips. Unsteady or inadequate power here will make your board fail intermittently and cause confusion generally everywhere.
--> 12v power is used for the reset circuit. Typically it's actually 18v coming in from the power supply, and that's okay. 12 is the minimum. Without this the reset circuit will prevent the CPU from booting up and the LEDs will both stay lit.
Another reason for a boot failure is because the communication from the CPU to the adapter (or installed ROM chip) is failing. For this to work the address bus and data bus lines, along with the handshaking lines must be working properly. Typical causes of failure here are transceiver chips (if installed) or other chips connected to those lines. PIA, RAM, ROM, or CMOS chips could be failing and tying down one or more of the required lines. Since the 01a-LEDs test doesn't use any of those chips except PIA1, IC17, and the CPU chip itself, you can remove the possible obstructing chips and run the LEDs test to see if it passes.
Sometimes it's bad traces on the board, cracked solder joints, bad chip sockets, or doubled up solder points (two pins soldered together where they shouldn't be).
I've also seen boards that run fine on the bench, and fail to boot when installed in the game. This can happen when the board is shorting out on the metal mounting brackets. In this case, cover the point on the mounting bracket with electrical tape and ensure nothing on the board pokes through it. The board does not need to be grounded via the mounting plate.
Of course, a board could fail to boot if the CPU chip was bad, but you have already tried another known good chip so it's not likely that.
Hope this helps, keep us posted