Laptop User Manual

Dual-Core Intel Xeon processor LV / E7520 Chipset / 6300ESB ICH
Dual-Core Intel
®
Xeon
®
processor LV with Intel
®
E7520 Chipset and Intel
®
6300ESB ICH
User’s Manual April 2007
58 Order Number: 311274-009
8.3 Level 3 Debug (Voltage References)
Table 25 includes the first items to look at when debugging a board that is not booting.
Table 25. Level 3 Debug (Voltage Reference)
Step Test Pass/Fail Criteria Cause of Failure
1 MCH DDR2 Channel A Vref 0.9 V Vref incorrect: check resistor values
2 MCH DDR2 Channel B Vref 0.9 V Vref incorrect: check resistor values
3 MCH Hublink Vref 0.354V Vref incorrect: check resistor values
4 MCH Hublink Vswing 0.804V Vswing incorrect: check resistor values
5 ICH Hublink Vref 0.347V Vref incorrect: check resistor values
6 ICH Hublink Vswing 0.696V Vswing incorrect: check resistor values
7
CPU0 VTT Vref
(back side of board)
0.775V Vref incorrect: check resistor values
8
CPU1 VTT Vref
(back side of board)
0.754V Vref incorrect: check resistor values
9 MCH VTT Vref 0.775V Vref incorrect: check resistor values