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Voltage attenuation due to high impedance on U7G1 for VCCIN power supply.

Pablo4
Novice
928 Views

The unit is not able to boot up, we can see the problem is isolated to voltage sensors when CPU is powered.
Marking

Debug and analysis:
By measuring U7G1 Power supplies, we noticed VCCIN is attenuated from 1.8v to 1.65v:

By confirming with curve tracer with different configurations, there are no big differences when comparing them with a good one:

 

Additional information:
1. BGA was not previously repaired.
2. There were no repairs around BGA that could cause this problem.
3. Voltage circuit on pcba was validated, no problem was found that could cause this problem.
4. The unit showed the boot up problem from the beginning.
5. BGA reflowed in order to verify if it fixes the high impedance and voltage problem.
6. By isolating the VCCIN PS from U7G1, the high impedance was still present on BGA end.

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JeanetteC_Intel
Moderator
855 Views

Hello Pablo4,

 

Thank you for posting in Intel Communities.

 

Based on the document you attached, can you confirm the product in question is an intel Xeon XEON D-1649N? I may have to transfer this thread if this is indeed a server CPU.


I'll wait for your reply.

 


Best regards,

JeanetteC.

Intel® Customer Support Technician


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Pablo4
Novice
832 Views

Hi, the CPU Part number is  GG8068204237401S RG0D, (IC, PROC, XEON D-1649N, 8 CORE, 45W,2.3GHZ,1667-FCBGA,ESD CDM 200V,NON-COMPLIANT TO CPS REQUIREMENTS). 

 

Pls help me to open the case and send to me the RMA, to determinate the root cause of the failur reported. 

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JeanetteC_Intel
Moderator
795 Views

Hello Pablo4,

 

Thank you for your confirmation. I want to let you know that we have a dedicated forum for this product and request type where you can get faster answers. I am moving this to the "Server" Forum for you.

 


Best regards,

JeanetteC.

Intel® Customer Support Technician


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Poojitha
Employee
756 Views

Hi Pablo4,


Good day!


Thank you for your patience as we work to address your query. For a quicker response, we recommend posting your question in the Embedded Community Forum. This dedicated platform is frequently monitored and provide detailed assistance.


https://community.intel.com/t5/Embedded-Products/ct-p/embedded-products


Thank you for your understanding!


Regards,

Poojitha N


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