820-3787 : Random Shutdowns

baker_jeff

New member
Replaced all 3 6708 chips with new from Mouser.

System is still crashing after replacing all 3. This is a DG model...

Further information:

This unit will freeze, fans spin up to 100%, and then it will turn off completely. It will turn on right away again via the power button, and has no errors/kernel panic messages on startup. It just boots right up as if nothing is wrong.
It will crash, consistently within 5-10 minutes if I fire up Runescape.

It will not boot up to my external drive running High Sierra, it turns off before reaching the login screen (wtf!).

It passes ASD.

If I disconnect the battery and run on the charger only, it does NOT crash.

It does crash with the original battery, or with a brand new battery connected.
 
Last edited:

2informaticos

Administrator
Staff member
FDMF6708 chips are correctly soldered, if you get 1.8V at VCORE.
Did you find any original FDMF6808 chip shorted?
 

baker_jeff

New member
Ah, I didn't bother to check, in another thread I just followed a recommendation to replace one by one and test. Is there a common line to check for a short?

The unit I have crashes after about 10 mins of running Runescape (that's the surefire way to make it turn off). The system locks up, fans ramp up for about 5 seconds, and then it turns off completely. No messages or kernel panic reports upon restart.
 

baker_jeff

New member
From Mouser hehe. Today, I couldn't get it to boot to an OS. It turns on, sits on the boot option menu forever, will show the Apple logo and load all the up, but then immediately shuts off. It does this with internal drive, external drive, and my bootable Catalina USB. again, wtf.
 

2informaticos

Administrator
Staff member
Maybe internal CPU problem.
Some scripts available on Internet to disable CPU sleep states.

Check if can run Windows, or Linux correctly.
 

baker_jeff

New member
Further information:

This unit will freeze, fans spin up to 100%, and then it will turn off completely. It will turn on right away again via the power button, and has no errors/kernel panic messages on startup. It just boots right up as if nothing is wrong.
It will crash, consistently within 5-10 minutes if I fire up Runescape.

It will not boot up to my external drive running High Sierra, it turns off before reaching the login screen (wtf!).

It passes ASD.

If I disconnect the battery and run on the charger only, it does NOT crash.

It does crash with the original battery, or with a brand new battery connected.
 

baker_jeff

New member
It doesn't crash during the switch.

I just forced integrated, and it crashed within 5 mins of Runescape.

I then forced discreet, and it crashed within 5 mins.
 

2informaticos

Administrator
Staff member
If you start a graphics stress test, be sure stays on Intel graphics.
Usually switchws to discrete, in such case.
Compare the board behaviour playing YouTube videos on both graphics.
 

baker_jeff

New member
Here's the other strange thing:
- It boots consistently using the customers internal SSD (Mojave)
- It turns off before it will load into a Catalina bootable USB
- It turns off before it will load into a High Sierra fresh external HDD
- It boots to my own fresh install Catalina SSD
 

baker_jeff

New member
I'm going to mark this one an unsolved mystery. With a fresh drive, and fresh install of Catalina, no issues. With the customer's original drive/install, I was also able to cause it to crash simply by closing the lid and waiting 10 seconds. Every time on the customer drive/install, this would crash it. With my new drive/isntall, no crashing. Gave it back to the customer with a fresh install.

Hard to say if it was the software... his drive in one of my units would not crash. Very strange.
 
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