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Old 05-21-2020, 04:34 AM   #1
mnciks11
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Default Pin 8 on the bios is shorted to ground

Fellow brothers

Kindly assist with the Following:
MSI Gaming Laptop
Model number: MS-1799
Motherboard no:MS - 16J91
VER: 1.0

The bios chip is shorted, i removed the bios chip from the board but short is still there, pin 8 of the bios chip which I believe it 3.3v it shorted to ground, pin 1 and pin 2 are shorted to ground as well, pin 5 and 6 as well

I injected 3.3v on pin 8, nothing is getting hot on the board, i even limited the current to 4 Amps but still nothing is getting hot

Again there is coil which is shorted straight to ground, I believe it 3.3v output, still when i inject 1v there nothing is getting hot yet the board is taking 4 Amps

Im totally confused

Can someone help me please .

Last edited by SMDFlea; 05-21-2020 at 05:10 AM..
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Old 05-21-2020, 05:11 AM   #2
piernov
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Default Re: Pin 8 on the bios is shorted to ground

Check if PCH die warms up when injecting on 3.3V rail.
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Old 05-21-2020, 07:34 AM   #3
whaldsz
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Default Re: Pin 8 on the bios is shorted to ground

You should observe a warming up of component at least, unless the short is below 1 ohms. Also replace the wire you use for injecting 3.3v. You need a larger diameter wire or else, nothing will heat up.

Last edited by whaldsz; 05-21-2020 at 07:58 AM.. Reason: correction
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Old 05-21-2020, 03:20 PM   #4
mnciks11
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Default Re: Pin 8 on the bios is shorted to ground

Quote:
Originally Posted by whaldsz View Post
You should observe a warming up of component at least, unless the short is below 1 ohms. Also replace the wire you use for injecting 3.3v. You need a larger diameter wire or else, nothing will heat up.
highly agreed, im gonna use a larger wire, it 000, straight to ground and my wire is getting hot instead, im gonna change my wire tomorrow and update you guys
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Old 05-21-2020, 03:22 PM   #5
mnciks11
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Default Re: Pin 8 on the bios is shorted to ground

Quote:
Originally Posted by piernov View Post
Check if PCH die warms up when injecting on 3.3V rail.
thank you so much my brother, i did that, i even removed the heat sink and poured alcohol, no movement and nothing heating up
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Old 05-21-2020, 04:43 PM   #6
whaldsz
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Default Re: Pin 8 on the bios is shorted to ground

Check again if your wire is heating up. Shorten your wire if possible. Inspect using microscope if you have, could be a shorted large cap or the PCH is busted. You might need to leave it for 5-15 min and get back to it to check which area is warming up.
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Old 05-21-2020, 10:52 PM   #7
mcplslg123
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Default Re: Pin 8 on the bios is shorted to ground

Agreed with others opinion-very likely its shorted PCH.
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