Synca MR320 - LED Function Issues

3.4 Led no function
Replace the main board ( Diagram-M M3)
Is the connector of LED surely connect to the
LCB(figure C)?
Reconnect the connector.
Yes
No
Uninstall the cover of LED(figure A), and
connect a new LED (figure B). Does the new
LED works?
Replace the new LED
Yes
No
Figure B
Figure BFigure A
Figure C