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[SOLVED]820-00165 - Brain dead.

gcain

gcain

New member
Doesn't perform an RTC reset, fan turns on to about 50% throttle, after a short while it goes to 100%.


CPU Stays cold, checked for PPVCOMP_S0_CPU and it's 0.2V.
 
J

JohnB8812

New member
There is no possible way the fans are spinning if CPU VCore is missing....resistance to ground on VCore? Any other rails missing?
 
gcain

gcain

New member
The board seems to be dead now.

Will go back to basics and measure on all the rails.

Something seems to be warm around the SSD jack, but I can't find exactly where it is.
 
J

JohnB8812

New member
"CPU Vcore is NOT needed for the fan to spin!" -My Bad did not know that. Question would be any history on this? Liquid, drop, random death etc?
 
gcain

gcain

New member
dukefawks said:
What the hell is an RTC reset?
Click to expand...

The three fan spin it does when you first connect power again.
If you call it something different, let me know.


There is no history with this board. Customer said he was using it and it died mid session.
 
P

phuketmymac

New member
Hey gcain,

It seems you haven't worked on a 820-00165 yet... these boards don't "Fan spins 3 times" like a 820-3437 would. Only once.
Plug a battery and check for Vcore again.

If no vcore, check resistance to ground on vcore and report.

Do you get the screen to light up at least when the span is spinning?
 
gcain

gcain

New member
Thanks, I hadn't noticed that before.

Board behaviour has changed a little over night.


Screen does not light up, USB mouse doesn't light up. The fan spins for a few seconds then it dies for a few seconds, then repeats.

PPBus : 8.58v
PP3v3_s0 = 3.3 (when it's running, drops to 0v)
PP3v3_s4 = 3.3 (when running)
PP3v3_s5 = 3.29 steady.
 
D

dukefawks

Administrator
And we still don't know if CPU Vcore is present. I bet it is as they usually do not power cycle otherwise. If CPU Vcore is present and this was a out of the blue failure the only thing I can advice is to try a known good BIOS.
 
gcain

gcain

New member
CPU VCore at L7310 & L7320 is fluctuating but mostly at 0v.

Would't it simply be a symptom of the other power rails fluctuating?
 
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gcain

gcain

New member
So I swapped the bios with a donor, and I get a flashing folder.

Can you explain what happened? Corrupt firmware? And how can I detect that in the future?

Do I need to clean the ME now?

I could read the firmware off the other chip, but if it's damaged, what's the point. I know the serial number.
 
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gcain

gcain

New member
Is anyone else able to clean the ME region on this please?

The customer is starting to become a little painful.
 
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