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Repair information for the Asus VivoBook S551LB laptop. First available on Amazon in July of 2013. Model number: V551LB-DB71T.

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Asus S551LN is totally dead. Tracing the failure?

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Ok, her’s the problem. The laptop Asus S551LN doesn’t power up, completely dead. The adapter gives 19 volts as it should. Of course I have tried to remove all the connected hardware and start without any luck. I have tried holding the power button as well.

I don’t seem to find any schematics on this except some pictures of the motherboard. So I measured the continuity at the power on switch. As drawn in the image I get continuity on adjacent legs and I get continuity on opposite legs when switch is pressed. (I assume the switch is working).

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There is this 3 leg mosfet (i think so) next to the powerjack. How to check if it is functioning as it should?

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I couldn’t identify any power IC or diode that could be a reason for this.

Any help here?

Answer this question I have this problem too

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Bonjour, j'ai le même problème, c'était l'un des 2 moffset (8 pins) en haut a droite de l'avant dernière photo du post. Il faut remplacer celui qui est en continuité avec un testeur. Voir video exemple :

https://youtu.be/QvGP2N8_Vb8

Bonne chance

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It could be the CMOS battery.

Right next to the ram shroud.

I was given an a551ln cause it “faulty”

Charge light on but no screen.

There's steps online how to reset the CMOS.

Hope that helps…in 2022

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Paulius will be eternally grateful.
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