J13 Front Bezel Connector; Speaker: Pins; Power Led And Keylock: Pins - TMC TI5VGF User Manual

Chapter 5 Installation

5.13 J13 Front Bezel Connector

The front bezel of the case has a control panel which provides light
indication of the computer activities and switches to change the computer
status. J13 is a 20-pin header that provides interfaces for the following
functions.
Hard Disk Drive LED
Turbo LED Connector
CPU Overheat LED
Speaker

Speaker: Pins 1 - 4

This connector provides an interface to a speaker for audio
tone generation. An 8-ohm speaker is recommended.

Power LED and Keylock: Pins 11 - 15

The power LED indicates the status of the main power
switch. The keylock switch, when closed, will disable the
keyboard function.
30 TI5VGF Pentium MVP3 ATX Motherboard User's Manual
Reset Switch
ATX Power On Switch
Power LED and Keylock
J13 Pin # Signal Name
1 Speaker out
2 No connect
3 Ground
4 +5V
J13 Pin # Signal Name
11 Power LED
12 No connect
13 Ground
14 Keylock
15 Ground