Schneider Modicon Premium TSX P57203Controller issue

[AG_PK]

All of suddenly, CPU went into error mode.
Case 1: with one power supply module CPU's ERR and TER LEDs lit up.
Case 2: after changing power supply module - CPU's ERR and I/O LEDs lit up.

In both case i can't connect with PLC and even can't download. The same situation persists even after resetting the PLC.

[MatthewM]

Test with no other cards on the backplane, just PSU and CPU, in case it is faulty card that is preventing the CPU from booting.

I also have had issues with the backplanes on a couple of old Premiums.  If possible, try a different backplane and test again with both power supplies.

[AG_PK]

Excuse me for being late...

I tried every possible solution, even changing racks, but the issue still persists. I hope it's a CPU hardware issue.