Figure 3-7 Examples Of Post Led Coding - Sun Microsystems Sun Fire V60x Manual

Figure 3-7 shows examples of how the POST LEDs are coded.
POST LEDs (as viewed from back of server)
= upper nibble bits
= lower nibble bits
RED
GREEN
1 0 0 1
high bits
(on left)
AMBER
RED GREEN
1 1 1 0 0
high bits
(on left)
Examples of POST LED Coding
FIGURE 3-7
During the POST process, each light sequence represents a specific Port-80 POST
code. If a system should hang during POST, the diagnostic LEDs present the last test
executed before the hang. When you read the LEDs, observe them from the back of
the system. The most significant bit (MSB) is the leftmost LED, and the least
significant bit (LSB) is the rightmost LED.
Note – When comparing a diagnostic LED color sequence from the server Main
Board to those listed in the diagnostic LED decoder in the following tables, the LEDs
on the Main Board should be referenced when viewed by looking into the system
from the back. Reading the LEDs from left to right, the most-significant bit is located
on the left.
POST Code = 95h
AMBER
OFF
upper nibble = 1001 = 9h
0 0 1 1
lower nibble = 0101 = 5h
low bits
(on right)
POST Code = CAh
OFF
upper nibble = 1100 = Ch
1 0 0
lower nibble = 1010 = Ah
low bits
(on right)
Chapter 3 Troubleshooting the Server Using Built-In Tools 3-23