TMC TI5VG User Manual page 33

Hard Disk Drive LED Connector: Pins 10 and 20
This connector connects to the hard drive activity LED on
control panel. This LED will flash when the HDD is being
accessed.
TI5VG Pentium VP3 ATX Motherboard User's Manual
Chapter 5 Installation
J13 Pin # Signal Name
10 Ground
20 5V
29