ok and ill try to pic up a sd card for my microscope so i can take a pic of U7200 for you it looks bad and so does everything around it.. this logic board was shutting off and on when i got it but was running had water damage around the U7200 so i ultrasonic cleaned it .. yes i have a good one and i have cleaned lots of boards but this is the first one that was running before i cleaned it and now its not
ok and ill try to pic up a sd card for my microscope so i can take a pic of U7200 for you it looks bad and so does everything around it.. this logic board was shutting off and on when i got it but was running had water damage around the U7200 so i ultrasonic cleaned it .. yes i have a good one and i have cleaned lots of boards but this is the first one that was running before i cleaned it and now its not
dycc, it's so very nice of you to help with this. I have the same symptom and will follow your instructions carefully to see if I can locate the issue.
Thank you!!
OK so I'm looking into that last one. Looks like my model is the K90i MLB variant.
PP3V3_S4 is controlled by Q7800 and Q7802 FETs - those both check out.
BUT Q7802 gate is being held low, making it inactive. The signal that controls that is P3V3_S4_EN
P3V3_S4_EN is controlled by PM_SLP_S5_L. This is low but it needs to be high for the system to run. That signal is controlled by the giant U1800 Cougar Point CPU.
ah looks like PM_SLP_S3_L, PM_SLP_S4_L, and PM_SLP_S5_L are all low. So I really suspect Intel Cougar U1800 is not working right.
I got low on PM_PCH_PWRGD, and also on SML_PCH_0_CLK
also I hear a faint clicking sound and green light only happens 1 out of 3 times...tried 2 different chargers and same thing. It seems like the green light is finicky :/
Comment