Intel S1200BT - POST Progress Code LED Example; Diagnostic LED POST Code Decoder; Common Problems and Corrective Actions

82 Intel® Server Board S1200BT Service Guide
Table 6. POST Progress Code LED Example
• Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are
concatenated as ACh.
Table 7. Diagnostic LED POST Code Decoder
LEDs
Upper Nibble LEDs Lower Nibble LEDs
MSB LSB
LED #7 LED #6 LED #5 LED #4 LED #3 LED #2 LED #1 LED #0
8h 4h 2h 1h 8h 4h 2h 1h
Status
ON OFF ON OFF ON OFF ON OFF
Results
101011 0 0
Ah Ch
Progress Code
Diagnostic LED Decoder
O = On, X=Off
Upper Nibble Lower Nibble
MSB 8h 4h 2h 1h 8h 4h 2h 1h LSB
#7 #6 #5 #4 #3 #2 #1 #0
Description
SEC Phase
0x01 X X X X X X X O First POST code after CPU reset
0x02 X X X X X X O X CPU Microcode load begin
0x03 X X X X X X O O Cache As RAM initialization begin
0x05 X X X X X O X O SEC Core at Power On Begin.
0x06 X X X X X O O X Early CPU initialization during Sec Phase
0x07 X X X X X O O O Early South Bridge initialization
0x08 X X X X O X X X Early North Bridge initialization
0x09 X X X X O X X O End Of Sec Phase
0x0E X X X X O O O X CPU Microcode Not Found.
0x0F X X X X O O O O CPU Microcode Not Loaded.
PEI Phase
0x10 X X X O X X X X PEI Core Starts