Solved laptop southbridge overheating (boot loop)

Gigabyte / Ga-ma790gp-ds4h
August 29, 2013 at 03:32:23
Specs: Windows 64, 3.616 GHz / 4094 MB
got a friends advent c900 roma to look at. it wont even get to the log on screen before it reboots. then continues in a boot loop.took it apart and with in seconds the southbridge is really hot.god knows how hot it is but i licked my finger and dabbed it on. a hiss and it dissapeared straight a hot i guess thats the problem??.
at the moment the mobos on my bench##( not in its case)## with just the screen and ac adaper plugged in. everythings cool. when i power it up the southbridge is more or less instantly overheated...with in 4/5 seconds
before i bin the mobo has anybody any ideas what i could try ??

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August 29, 2013 at 13:53:18
✔ Best Answer
I think it may be a waste of time trying to replace a surface mounted many pronged IC like your southbridge probably is. If you still want to check it for curiosity's sake you could try a cold spray like . I'm not recommending this particular brand. I'm sure any local electronics store will have something similar. You may be able to keep it cool long enough to boot but that gets you no closer to a usable laptop. Be careful in that these sprays can be VERY cold and super cooling some components can be bad, also going from super hot to super cold is almost always a bad thing. Keeping it cool is the trick. Also, If the component is not fried already it may be worth your time to test the output voltages on your PS as higher than expected voltages (and over clocking) will cause heat problems.

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August 29, 2013 at 14:11:33
One more thing I should say is that from the little searching I did it seems that these laptops are primarily sold in the UK and Europe. If you are there then this is a non-issue but if you are in the USA you should make sure that the PS is able to work in our 60 hz A/C environment as well as the 50 Hz A/C common to most European power grids.

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August 29, 2013 at 14:30:20
thank you for your suggestions. btw im in the uk.
i think i will look for a used mobo.

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August 29, 2013 at 20:06:50
Two things come to mind:

First, the heat sink for the chipset may have been removed and needs to be reset with a surface cleaning and a new application of thermal compound since it sounds like there is little of no heat transfer from the chipset to the heat sink so the heat builds very fast.

Second, the laptop may have been through getting wet or having something spilled on it (touch and look, sticky areas or film/discoloration on surfaces) that could let higher voltages jump from one part of the circuit board to an area that should only have lower voltages, causing the excess heat.

You have to be a little bit crazy to keep you from going insane.

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