2.25 TC-A2025 The Device Cannot Be Powered on Because the SIP Power Module Is Faulty

Publication Date:  2012-07-18 Views:  157 Downloads:  0
Issue Description
Related information about the product and version: the T3500
One device works for a while and then the device is powered off. When the device is powered on again, the screen is black and the system power indicator on the front panel of the chassis is green on.

Check alarm information on the ISM and find that alarms are generated on VDD_1V8_FBD and VTT_0V9. Table 2-4 shows the alarm information.
Table 1-1  Alarm list of power single VDD_1V8_FBD and VTT_0V9
Serial No. Source Type Description Occurrence Time
9 VDD_1V8_FBD Voltage Lower Non-recoverable going low | Asserted 2009-11-01 00:00:13
10 VTT_0V9 Voltage Lower Non-recoverable going low | Asserted 2009-11-01 00:00:12
Alarm Information
None
Handling Process
 Step 1     Switch off the system power switch to power off the device.                               
Step 2    
Replace the chassis (an integrated component of the cabinet) and all memory bars. For details on the replacement of the memory bars, see Replacing a Memory Bar in Oceanspace T3000 Storage Node Troubleshooting-(V100R001C01).

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Root Cause
1.         If the system power indicator on the front panel of the chassis is green on, the device has been powered on.
2.         Check alarm information on the ISM and find that alarms are generated on VDD_1V8_FBD and VTT_0V9. Table 2-4 shows the alarm information.
3.         Check the sensor list on the ISM and find no exceptions except that VDD_1V8_FBD and VTT_0V9 are 0 V.
In conclusion, the SIP power module that is on the mainboard and provides power for the memory is faulty, which leads to memory damage due to overvoltage, VCC12V1 line-to-ground short circuit, and VCC12V1 protective tube fusion.
 
Suggestions
None

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