MSI U100 Plus No power after using for 30 mins - Schematic Request

[bappies7]

I have a MSI U100 Plus notebook, after using it for like 30 mins it just black out.
I can smell something burn coming from the netbook.

It cannot be powered on now.

Upon opening up the netbook, all components near the power jack seems ok to me.

Using a meter to measure for short but none can be found.
Measuring the voltage (20VDC) in at the power jack seems not stable. it fluctuate between 5 to 1 volts.

The board area near to the power jack feel warm after 2 mins after plugging in.

Mainboard model is MS-N0111 ver 1.0

I have the schematics for this board model.
I 'm lost as to how to continue to troubleshoot next.

Anybody have the boardview for this model?


Anybody have this similar issue with me before can share how you resolve it.


Thanks.

Attached photos of board.

[Francisco.s]

Re: MSI U100 Plus No power after using for 30 mins.

Measuring the voltage (20VDC) in at the power jack seems not stable. it fluctuate between 5 to 1 volts.

I think there is a short-circuit in 20v. line, probably a ceramic capacitor.
Share the schematic in order to help you better.

[bappies7]

Re: MSI U100 Plus No power after using for 30 mins.

OK.

Here the schematics..


The mosfet Q40 AO4413 feel hot, when the 20VDC plug in to the jack.

[Francisco.s]

Re: MSI U100 Plus No power after using for 30 mins.

The mosfet Q40 AO4413 feel hot, when the 20VDC plug in to the jack

Please post resistance between DC_IN+ and GND.

[bappies7]

Re: MSI U100 Plus No power after using for 30 mins.

Please post resistance between DC_IN+ and GND.

Red Lead at DC_IN+
Black Lead at GND
Reading 4.4K Ohms.

Black Lead at DC_IN+
Red Lead at GND
Reading 4.8k Ohms.

[Francisco.s]

Re: MSI U100 Plus No power after using for 30 mins.

Red Lead at DC_IN+
Black Lead at GND
Reading 4.4K Ohms.

I'm afraid you have to get a laboratory power supply, and inject a low voltage to DC_IN+, and increment it in low steps until consumption gets one or two amperes, then locate the component that is getting hot.

Regards.

[bappies7]

Re: MSI U100 Plus No power after using for 30 mins.

Anybody have the boardview for this model?

[bappies7]

Re: MSI U100 Plus No power after using for 30 mins.

The mosfet Q40 AO4413 feel hot, when the 20VDC plug in to the jack.
What could be faulty?

How to test mosfet Q40 if it working good...

[ktmmotocross]

Re: MSI U100 Plus No power after using for 30 mins.

check for short to ground on DC_IN+

[bappies7]

Re: MSI U100 Plus No power after using for 30 mins.

check for short to ground on DC_IN+

There no short...

[Agent24]

Re: MSI U100 Plus No power after using for 30 mins.

Do you get correct voltage from the power adapter when it is NOT plugged into the laptop?

[bappies7]

Re: MSI U100 Plus No power after using for 30 mins.

Anybody have the boardview for this model?

[Compute]

Re: MSI U100 Plus No power after using for 30 mins.

i have

[Compute]

Re: MSI U100 Plus No power after using for 30 mins.

MSI MS-N0111 Boardview

[Ramee]

Re: MSI U100 Plus No power after using for 30 mins.

Thanks compute!

[siroos_tz]

Re: MSI U100 Plus No power after using for 30 mins.

OK.

Here the schematics..


The mosfet Q40 AO4413 feel hot, when the 20VDC plug in to the jack.

Thank you very much.