820-3476 - No Power

kronos23

New member
Hi. I am working on a 820-3476 board with no power. All S5 rails are present but missing S4 and below. I found that PM_SLP_S4 is missing so I traced that back to the CPU. Found that PM_PCH_SYS_PWROK is missing. Checked for ALL_SYS_PWRGD is missing as well. Based on schematic, this signal is generated by U8160 but on the board its NC. Now I am lost. Any ideas ?
 

dukefawks

Administrator
Liquid spill? Check SLP_S4 again for pulses, any failure in the power sequence will cause the board to power cycle.
 
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