Short SMC

MDY

New member
This board is not liquide damage. I found short smc that I replaced and now I have green light and ppbus at 12.54V
3V estables but 5V pulsing each 6 seg. CPU core pulsing too. Could be bad donor-SMC or something else?
 
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smiba

New member
Check all S0 lines for a short to ground.

With short SMC I assume you meant PP3V42_G3H? Is the voltage of this stable?
 

MDY

New member
820-3115
Customer says that one day it just dont power anymore. No short on coils.
 
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MDY

New member
Cpu vcore also pulsing. Now told me that fan run fast last time and opened the laptop to replace the cpu compound and clean the fan.
 

MDY

New member
History:
Other guy replaced the isl6259 but he burnt both mosfets someway. So, I think in some time ppbus recived 20V directly from ac adapter if upper mosfet was burnt firstly.
Can that burn some component on ppbus?
 

MDY

New member
Ok, told me he power the board without isl6259
This damaged both mosfets, low and upper. But this can damage more things?
 
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