Getting the rug pattern and it stay on this. The LED is not displaying anything. Checked voltages to RAM, and appear fine. Redid some connectors and headers, but problem still persist. Any ideas what to check?
Check the voltages on the RAM chips. The 4 corners should be +5V, +12V, -5V and ground.
Is the power supply original or has it been replaced with a switcher? If the former, are all three LEDs lit? If the latter, check the voltages both at the barrier strip and at the MPU board. Swithcers tend to drift over time.
It's the original power supply that was rebuilt. I am showing all three LEDS lit. Checked voltages on the RAM and it was low until I replaced some headers and connectors. I was getting 4.84 VDC on the RAM. I didn't check the -5 or +12. I do not own the game, but working on it for a friend. What would be a good "check list" of items to check next time I work on the game?
That is a good start. Always check the voltages at the power input or at some actual chip locations. There can be a lot of reasons why the power is not getting through even though it tests great at the power supply.