Cannot detect MAX V cpld and Cyclonne 5GX in the same jtag chain

Hi @ak6dn I have isolated the MAXV in the chain and still no luck I would like to send the cards back to the board assembler and get the part changed but they have no stock - long lead time issues everywhere ! Perhaps I'll send it back anyway and get them to remove, recheck the central gnd pad connection and then reflow the same device. But is there anything else that I can try first ? I have read that 2nd hand parts already programmed may have the jtag interface disabled but the supplier is adamant that the parts are brand new. Is there anything else that causes an inactive TDO ? Thanks