Error code
pc-Er
Meaning
Display board and main control board cannot communicate
Moderate
What to do
Why this happens
The issue may stem from a loose or damaged communication cable between the Main and Panel PCBs, a defective Main PCB, or a defective Panel PCB.
How to fix it
Reseat or replace the communication cable; if that does not resolve it, This one needs a professional technician to replace the PCB boards.
SourceSamsung service manual