.. _jumpers:

Jumpers
=======

Clear CMOS Jumper
-----------------

The onboard CMOS RAM stores system configuration data and has an onboard
battery power supply. To reset the CMOS settings, set the jumper on pins 2
and 3 while the system is off. Return the jumper to pins 1 and 2 afterwards.
Setting the jumper while the system is on will damage the mainboard. The
default setting is on pins 1 and 2.

.. _figure-clear-cmos:
.. figure:: images/clear_cmos.*
   :align: center
   :alt: CLEAR CMOS jumper

   CLEAR CMOS jumper

CLEAR CMOS jumper settings:

================ ====== ====== ======
Setting          Pin 1  Pin 2  Pin 3
================ ====== ====== ======
Normal (default) On     On     Off
Clear CMOS       Off    On     On
================ ====== ====== ======

.. warning:: Except when clearing the RTC RAM, never remove the cap from the CLEAR_CMOS jumper default
	     position. Removing the cap will cause system boot failure. Avoid clearing the CMOS while the system
	     is on; it will damage the mainboard.

Backlight Power Select Jumper
-----------------------------

The mainboard has a jumper that controls the input voltage delivered to the
LVDS inverter connector. The jumper is labeled as "JM2". The jumper settings
are shown below.

.. _figure-backlight:
.. figure:: images/backlight.*
   :align: center
   :alt: Backlight power select jumper

   Backlight power select jumper

Backlight power select jumper settings:

=============== ====== ====== ======
Setting         Pin 1  Pin 2  Pin 3
=============== ====== ====== ======
+12V (default)  On     On     Off
+5V             Off    On     On
=============== ====== ====== ======

Panel Power Control Jumper
--------------------------

The mainboard has one jumper that control the voltage delivered to the LVDS
panel connector. The jumper is labeled as "JM3". The jumper settings are
shown below.

.. _figure-panel-power:
.. figure:: images/panel_power.*
   :align: center
   :alt: Panel Power Control jumper

   Panel Power Control jumper

Panel Power Control jumper settings:

================ ====== ====== ======
Setting          Pin 1  Pin 2  Pin 3
================ ====== ====== ======
+3.3V (default)  Off    On     On
+5V              On     On     Off
================ ====== ====== ======