3. Jumpers¶
Jumper Description
A jumper consists of pair conductive pins used to close in or bypass an electronic circuit to set up or configure particular feature using a jumper cap. The jumper cap is a small metal clip covered by plastic. It performs like a connecting bridge to short (connect) the pair of pins. The usual colors of the jumper cap are black/red/blue/white/yellow.
Jumper Setting There are two settings of the jumper pin: Short and Open. The pins are Short when a jumper cap is placed on the pair of pins. The pins are Open when the jumper cap is removed.
In addition, there are jumpers that have three or more pins, and some pins are arranged in series. In case of a jumper with three pins, place the jumper cap on pin 1 and pin 2 or pin 2 and 3 to Short it.
Some jumper size is small or mounted on the crowded location of the board that makes it difficult to access. Therefore, using a long-nose pliers in installing and removing the jumper cap is very helpful.
Figure 1: Jumper settings example
Warning
Make sure to install the jumper cap on the correct pins. Installing it in the wrong pin might cause damage and malfunction.
3.1. 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 PBL_SET1. The jumper settings are shown below.
Figure 2: Backlight power select jumper diagram
Backlight power select jumper settings:
| Settings | Pin 1 | Pin 2 | Pin 3 |
|---|---|---|---|
| 12V (Default) | Short | Short | Open |
| 5V | Open | Short | Short |
3.2. Panel Power Select Jumper¶
The mainboard has a jumper that controls the voltage delivered to the LVDS panel connector. The jumper is labeled as PVDD_SET1. The jumper settings are shown below.
Panel power select jumper settings:
| Settings | Pin 1 | Pin 2 | Pin 3 |
|---|---|---|---|
| 5V | Short | Short | Open |
| 3.3V (Default) | Open | Short | Short |
3.3. 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 jumper is labeled as JM1. The default setting is on pins 1 and 2.
Figure 4: Clear CMOS jumper diagram
Clear CMOS jumper settings:
| Settings | Pin 1 | Pin 2 | Pin 3 |
|---|---|---|---|
| Normal (default) | Short | Short | Open |
| Clear CMOS | Open | Short | Short |
Note
Except when clearing the CMOS RAM, never remove the cap from the JM1 (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.
3.4. Mini PCIe Revision Select Jumper¶
The mainboard has a mini PCIe select jumper that determines the supported revision specification of mini PCIe slot. The jumper is labeled as MPCIE_SET. The jumper settings are shown below.
Figure 5: Mini PCIe revision select jumper diagram
Mini PCIe revision select jumper settings:
| Settings | Pin 1 | Pin 2 | Pin 3 |
|---|---|---|---|
| Support Revision 1.2 (Default) | Short | Short | Open |
| Support Revision 1.1 | Open | Short | Short |
3.5. Miscellaneous Select Jumper¶
The mainboard has a miscellaneous select jumper that is used to enable/disable the SD card write protect, detect the active/inactive audio head phone, and auto power-on function. The jumper is labeled as JM3. The jumper settings are shown below.
Miscellaneous select jumper settings:
| SD Card Write Protect Settings | Pin 1-2 |
|---|---|
| Disable (Default) | Short |
| Enable | Open |
| Reserved | Pin 3-4 |
|---|---|
| (Default) | Short Open |
| Audio Head Phone Detect Settings | Pin 5-6 |
|---|---|
| Active (Default) | Short |
| Inactive | Open |
| USB Bus Selection Settings | Pin 7-8 |
|---|---|
| USB to Mini PCIe (Default) | Short |
| USB to WLAN | Open |
| Auto Power On Function by H/W Settings | Pin 9-10 |
|---|---|
| Enable | Short |
| Disable (Default) | Open |