EVGA Z390 FTW User Manual page 17

EVGA Z390 FTW (123-CS-E397)
19. Debug LED / CPU Temp
This is a two-digit POST code reader, displaying in hexadecimal, which means
the characters available (when working as intended) are 0-9, A-F and has a cap
of 255 characters. The POST codes are listed in the troubleshooting section on
Page 144. After the system boots, it will display the temperature in Celsius.
This temperature is specifically for the CPU socket, which usually reads slightly
higher than a given CPU core. To read this temperature in Fahrenheit, take the
value in Celsius, multiply by 9/5 (or 1.8) and add 32.
20. USB to SPI for BIOS Flash
This USB port is designed to connect directly to the motherboard to allow the
motherboard BIOS to be flashed, even if no CPU is installed. For more
information on how to flash your BIOS using this method, please see Page 136.
21. USB 2.0 Headers
The USB2.0 header is used to connect additional USB interface plugs to the
motherboard; these headers are most often used to connect the motherboard to
the chassis to enable the USB2.0 ports on the chassis. These will function
similarly to the USB2.0 ports found on the motherboard's hardwired I/O hub,
but these can also be used for the chassis' front panel USB, auxiliary ports that
mount in the card slots, and certain devices that directly connect to the header.
USB 2.0 standard is 500ma @ 5V per port (header total is 1000ma) for
unpowered devices. If your USB device requires more power, it is
recommended to attach a powered USB Hub.
22. Front Panel Audio Connector
This motherboard header is used to plug in the audio cable included with most
PC chassis. This connector is required for audio recording and/or playback
via the audio connectors on the chassis. This header has a connector that
looks similar to the USB2.0 header and uses the standard "HD Audio" jack.
Some chassis may provide two headers: one labeled HD Audio, and one
labeled AC'97 – an AC'97 cable is not compatible with this header on the
Z390 FTW.
23. PC Speaker
This is a small mono low-fidelity speaker, which is permanently attached to the
motherboard. Its primary use is for debugging purposes. A POST beep may
indicate a successful POST or various tones for USB initialization, while other
beeps may indicate an issue during the POST process. Please see Page 142 for
more details.
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