KC Micro Tronix
Member
820-00165-A "H2O Basket Case" Pulls 0.165 mA Is in a S0 state does not boot
I have been digging through my trash pile to learn today. Now i am working on a 820-00165-A that had water damage all over. Luckily I have not had to do trace repair. I know the back light section trashed. I don't want to waste time on the back light unless I get it to boot. I have had to replace a few shorted caps. Now I have a MagSafe light and all my rails are up!
Now the board is in a S0 State with (All S0 rails up!)
Normally during a boot cycle when watching thermal imaging U3900 fires up followed shortly by the memory modules and CPU. I am not getting the normal memory module warming or CPU warming. The CPU does warm slightly but obviously it is doing nothing.
Looking around on the memory "I did check all the voltages on the modules and all test good!" I noticed that MEM_B_CLK_N<1> is not present. I then checked the CPU SUS clocks. Nice square waves. Bios has power. I went directly to all the clocks. All are present.
It kind of looks like a bios issue. The voltages are present and clocks are present.
I would appreciate some guidance on what I should check. Seems like I am in a digital side of the house and just not sure what to look at.
I have been digging through my trash pile to learn today. Now i am working on a 820-00165-A that had water damage all over. Luckily I have not had to do trace repair. I know the back light section trashed. I don't want to waste time on the back light unless I get it to boot. I have had to replace a few shorted caps. Now I have a MagSafe light and all my rails are up!
Now the board is in a S0 State with (All S0 rails up!)
Normally during a boot cycle when watching thermal imaging U3900 fires up followed shortly by the memory modules and CPU. I am not getting the normal memory module warming or CPU warming. The CPU does warm slightly but obviously it is doing nothing.
Looking around on the memory "I did check all the voltages on the modules and all test good!" I noticed that MEM_B_CLK_N<1> is not present. I then checked the CPU SUS clocks. Nice square waves. Bios has power. I went directly to all the clocks. All are present.
It kind of looks like a bios issue. The voltages are present and clocks are present.
I would appreciate some guidance on what I should check. Seems like I am in a digital side of the house and just not sure what to look at.
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