Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance
Flight Crew Overcame Equipment Problem; Flight Crew Took Evasive Action; Flight Crew Returned To Clearance
Aircraft
I was the PF (Pilot Flying) doing CA (Captain) upgrade line check. Coming on the left downwind for runway 19L in ZZZ at 3000 ft. IMC we got a TA/RA and the TCAS was showing a traffic about 3 miles 12 o'clock same altitude; I disconnected the A/P (Auto-Pilot) and A/T (Auto-Throttles) and initiated the TCAS maneuver following the guidance which directed us to climb; PM (Pilot Monitoring) advised ATC and ATC informed us that there were no traffic in the vicinity of the airport and advised us to get back to 3000 ft. and vectored us for the ILS approach 19L and while we're descending back to 3000 ft. the FO (First Officer) side inbound DU (Display Unit) went blank; few seconds later the same display unit on my side went blank as well at this time we were already turning final and I saw the runway and decided to continue to land meanwhile the PM called the ATC and advised them that we had multiple display failures; 2 minutes later we got the displays back and we continued the visual approach to landing.False TCAS TA/RA and multiple display failures.
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B737-800 Captain reported TCAS warning on approach.