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Measuring dead short on CPU VCORE on an 820-00165. Any hope?

bjf

bjf

Member
I have an 820-00165 with a 0.000 diode measurement on PPVCC_S0_CPU. I've removed R7310 and R7310 to eliminate some variables. Nothing heats up when I send power through the circuit. I sent around 3amps at 1V for at least 5 minutes. Nothing was heating up. Heatsink was removed.
I've run flux under the CPU and heated it up for an extensive amount of time. After that I did another ultrasonic cleaning. No change. Any ideas what this might be?
 
A

aprendiz

Moderator
Any history?? Resistance on L7310 and L7320 to GND?? Where are you applying voltage after remove R7310 and R7320??
 
bjf

bjf

Member
I don't know the history on this one. It was a spill but I'm not seeing any signs of it. I connected my leads to C1031.
L7310 Resistance to Ground: 305Ω
L7320 Resistance to Ground: 328Ω
 
bjf

bjf

Member
I'm curious what you're thinking is with this. I put the them back on and the short measures 0.000 drop to ground across both resistors.
 
A

aprendiz

Moderator
According to the data you provide the processor is burned, but I do not see a reason to be true if there are no traces of water damage or short on power rail (PPVCC_S0_CPU)
 
bjf

bjf

Member
Yeah, the board was definitely hit by liquid. There just aren't any visible signs. Someone else here cleaned it with an ultrasonic before I got to it.

Thanks for the input, I was assuming the CPU was fried but was just hoping there might be some outside chance it was something else.
 
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