Acer R720 Series manual Diagnostic LED Decoder, Checkpoint, Description, Chipset, Memory, PCI Bus

150					5 Troubleshooting
	Diagnostic LED Decoder
Checkpoint	G=Green, R=Red, A=Amber				Description
code
	MSB			LSB
0x13h	OFF	OFF	G	A	SMM initialization
Chipset
0x21h	OFF	OFF	R	G	Initializing a chipset component
Memory
0x22h	OFF	OFF	A	OFF	Reading configuration data from
					memory (SPD on DIMM)
0x23h	OFF	OFF	A	G	Detecting presence of memory
0x24h	OFF	G	R	OFF	Programming timing parameters in
					the memory controller
0x25h	OFF	G	R	G	Configuring memory parameters in
					the memory controller
0x26h	OFF	G	A	OFF	Optimizing memory controller
					settings
0x27h	OFF	G	A	G	Initializing memory, such as ECC init
0x28h	G	OFF	R	OFF	Testing memory
PCI Bus
0x50h	OFF	R	OFF	R	Enumerating PCI busses
0x51h	OFF	R	OFF	A	Allocating resources to PCI busses
0x52h	OFF	R	G	R	Hot Plug PCI controller
					initialization
0x53h	OFF	R	G	A	Reserved for PCI bus
0x54h	OFF	A	OFF	R	Reserved for PCI bus
0x55h	OFF	A	OFF	A	Reserved for PCI bus
0x56h	OFF	A	G	R	Reserved for PCI bus
0x57h	OFF	A	G	A	Reserved for PCI bus
USB
0x58h	G	R	OFF	R	Resetting USB bus
0x59h	G	R	OFF	A	Reserved for USB devices