Debug Procedure
6.2Level 2 Debug (Power Sequence)
Check the items in Table 7 below if “SYSTEM PWRGD” is not illuminated.
Table 7. | Level 2 Debug (Power Sequence) |
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Item |
| Test |
| Pass/Fail Criteria | Cause of Failure | |
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| Measure voltage across: |
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| • | C3K2: 3.3 V |
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1 | Primary power supply voltages | • | C3K1: | External power supply failure | ||
• | C4K3: 5 V | |||||
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| • | C4K2: 5 V |
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| • | C4K5: 12 V |
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2 | 1.8 V |
| C9E14: 1.8 V | DDR2 power supply failure | ||
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3 | 1.5 V |
| C5C5: 1.5 V | MCH/PXH/ICH core power supply failure | ||
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4 | 1.8 VSBY | C9G5: 1.8 V | DDR2 standby power supply failure | |||
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5 | CPU VTT power supply | C9H10: 1.2 V | CPU_VTT power supply failure | |||
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6 | CPU0 VRD | L9J2: 1.2 V - 1.4 V | CPU0 VRD Failure | |||
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7 | CPU1 VRD | L5J1: 1.2 V – 1.4 V | CPU1 VRD Failure | |||
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8 | Verify “SYSTEM PWRGD” LED | CR2H1: Green | Power Sequence Failure | |||
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6.3Level 3 Debug (Voltage References)
Table 8 includes the first items to look at when debugging a board that does not boot.
Table 8. | Level 3 Debug (Voltage References) |
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Item |
| Test | Pass/Fail Criteria | Cause of Failure |
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1 |
| MCH DDR2 Channel A Vref | R6D4: 0.9 V | Vref incorrect: check resistor values |
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2 |
| MCHDDR2 Channel B Vref | R6B3: 0.9 V | Vref incorrect: check resistor values |
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3 |
| MCH Hublink Vref | R5F11: 0.354 V | Vref incorrect: check resistor values |
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4 |
| MCH Hublink Vswing | R5F8: 0.804 V | Vswing incorrect: check resistor values |
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5 |
| ICH Hublink Vref | R4G7: 0.347 V | Vref incorrect: check resistor values |
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6 |
| ICH Hublink Vswing | R4G4: 0.696 V | Vswing incorrect: check resistor values |
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7 |
| CPU0 VTT Vref | R2U5: 0.775 V | Vref incorrect: check resistor values |
| (Back side of board) | R2V2: 0.775 V | ||
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8 |
| CPU1 VTT Vref | R4U5: 0.754 | Vref incorrect: check resistor values |
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| (Back side of board) | R5V1: 0.754 |
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9 |
| MCH VTT Vref | R6F2: 0.775 V | Vref incorrect: check resistor values |
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10 |
| DIMM A DDR2 Vref | R3M1: 0.9 V | Vref incorrect: check resistor values |
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11 |
| DIMM B DDR2 Vref | R2M1: 0.9 V | Vref incorrect: check resistor values |
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34Intel® Xeon™ Processor, Intel® E7520 Chipset, Intel® 6300ESB ICH Development Kit User’s Manual
