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820-2879, Not Starting


This board does not start when we short any of the “Debug power button” resistors.
Board has 3v on pm_slp_s3 L, which means is on s0 state but doesn’t power on…there’s no fan spin.
R7820 has 3.3v on pin 1 and 0v on pin 2.
After removing, R7828 has voltage on pin1 and 0v on pin2.
Voltages around u7710 seem alright.
Checking around u7500 circuit I noticed that pin17 didn’t have correct voltage.
I decided to replace c7564 and that fixed the issue. Board now starts and works normally.

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April 17, 2015