820-00165 Missing PM_SLP_S3_L

tlough75

Member
Got a sick LB from a customer. They foolishly bought it broken from ebay thinking they could save money and have me fix it. After inspecting it through the MS I saw that R1623, R1451, R1583 & R1462 were toast so had to replace and run a couple wires. Board is drawing 30 mA and not turning on. After testing all the power aliases page I am missing my S0 enables which looks like I need PM_SLP_S3_L, but I do not have, I have PM_SLP_S4_L. not sure where to check next. I checked if I have a short on my missing S0 rails but didn't find anything. could use a hand with this one.
 

2informaticos

Administrator
Staff member
Missing PM_SLP_S3_L, or PM_SLP_S3_BUF_L?
Maybe both, we need to know.
Remove R8178 and check if PM_SLP_S3_L goes high.
 

2informaticos

Administrator
Staff member
Post diode mode to ground at PM_SLP_S3_L.
Do you have steady 3V at PM_SLP_S4_L?

These signals are pulled-high inside PCH, so the problem is on its side.
Could be a problem caused by accumulated crap under PCH.
Heat it with quality flux until 180-200 degrees.
 
Top