EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport
Aircraft
After departure from Runway XXL and around 4000 feet the Captains PFD displayed red X; Captains MFD displayed red X; EICAS went blank; RMU (Radio Management Unit) #1 reverted to engine display; autopilot disengaged and the autopilot panel went blank; flight director was lost and all flight mode indications were lost. Being on an RNAV departure I requested a momentary vector from departure and were told to fly present heading. The CA mentioned this looks like a symbol generator #1 failure. I got the QRH out and began looking up the procedure for a SG1 failure. 30 seconds later a strong electrical burning smell filled the cockpit with a light haze of smoke. We [advised ATC] and returned to [departure airport]. CA called the FA and told her that we were returning to [the airport] for smoke in the cockpit.
EMB-145 First Officer reported returning to the departure airport after experiencing smoke in the cockpit probably related to failure of symbol generator #1.