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#1
Laptop shuts down after few minutes
Hi,
first sorry for my english but i'll try to explain my problem anyway:
i got friends laptop (HP G61-410SA) which was completely dead.The battery for this laptop was dead before.Suddenly he unpluged power source from the socket while laptop was runing and after that he was unable to switch it on again.I checked first power adapter by multimeter,it shows correct voltage (14vdc-inner and 19vdc-middle), so i've decided to change motherboard (HP spare 577997-001).Got used one on ebay,changed it,checked vents/heatsink if it has any dust inside,cleaned,applied thermal grease as should be,assembled,switched laptop on,everything seemed goes well but after few minutes (3/5min) laptop shuts down.On every next try to switch on,time it keeps on,goes shorter and shorter.Seems like owerheat but vent is spinning normaly,without load,just normal,for start it spins faster after some short time goes to normal silent state but not stops at all,so it seems ok,tried to reseat heatsink and so on,just to ensure.Next what i did are i've removed componnents one by one,hard disk drive,cd-rom,one ram modules,tried to swap ram modules,got another one ddr2,reset cmos,set bios to safe defaults,nothing helped.Then got another power adaptor,same thing,even changed cpu,no way.Even if i will go to BIOS and leaving laptop in that state for a while it does the same thing,after 3/5 minutes goes off.What is very strange,i can't switch laptop on at all with battery removed,only on dc power cord,never had laptop before that i couldn't use it without battery.Is this normal?All those steps i have done with laptop assembled and with almost all componnets on the desk.Still confused,is there some known issue for this or just i got bad motherboard with some temperature sensor broken or something like that.Any help,ideas,is much appreciated.