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laptopul Lenovo Think pad R61 nu porneste

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Buna ziua, sunt incepator la reparatiile placilor de baza ale laptopurilor, as dori sa repar un laptop Lenovo Think pad R61, atunci cand conectez incarcatorul, fara ca bateria sa fie conectata, se aprinde ledul de incarcare baterie si ledul de power 220V, dar apoi se sting imediat.

 

Am incercat sa masor sursa de alimentare si am gasit pe 2 sigurante 3,25V iar pe alta 5V, insa la conectorul bateriei nu am tensiune. Incarcatorul de baterie mentine tensiunea de 20V nu se protejeaza.

 

Ce as putea sa masor, sau care ar fi punctele cheie  de  masura,?

 

Va multumesc anticipat! 

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Buna ziua, m-am uitat pe ce imi ati dat dar nu ma ajuta foarte mult, nu mi dau seama ce sa masor si unde, apoi la pornire sursa de alimentare ce verifica si ce alimenteaza, am si o memorie P24C0-8 care nu se alimenteaza

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