Hi,

The behavior of the diodes on the chessboard (if I understood correctly) is perhaps due to bad contacts.
Either the connector of the module or the wiring on the chessboard.
It is also possible that one of the drivers on the chessboard is defective.
Then, you have to check the power supply.
At the output of the HG5001, then the output of the voltage regulator.
If you can't test the RAM (with arduino or other), change the capacitors (especially electrochemical).

Cordially.