Common symptoms of faulty panel PCB:
If your printer has:

Price:
Price 850.0 INR / Set
Minimum Order Quantity : 2 Sets
Pattern : Original Replacement
Model No : Canon 2900 Full Body
Printer Type : Laser Printer
Size : Original Size
Price 500.0 INR / Piece
Minimum Order Quantity : 2 Pieces
Pattern : Rectangular PCB with soldered ICs and ports
Model No : RM12314, RM28085
Printer Type : Laser Printer
Size : Standard for HP 1020 series
Price 30.0 INR / Piece
Minimum Order Quantity : 10 Pieces
Pattern : OEM Replacement
Model No : 1020 Toner Lever Sensor
Printer Type : Laser Printer
Size : Standard
Price 350.0 INR / Piece
Minimum Order Quantity : 5 Pieces
Pattern : Standard PCB layout
Model No : RM27385
Printer Type : Laser Printer
Size : Original Fit for HP M126/128