IBM Thinkpad/Lenovo R500 Power Problems

[jsmoke]

I have an Ibm Lenovo R500 that will post and work fine for days if it has not been powered on for awhile. However if you try to reboot after it has been powered on it will not post and will not post again until the system has drained it charge I'm guessing(usually around a day).

This leads me to believe it has something to do with bad mosfets as problem started after wrong charger was plugged in. I am still looking for a schematic for this laptop but have yet to find one. I have located some mosfets on the board witch I believe could be the culprit to my problem. The 3 mosfets shown with K039 markings on them I read 16 ohms from source to drain.

Could anyone with more knowledge than me chime in to let me know if I am on the right track? Also would anyone know what I could get for a replacement for those mosfets.

Thanks for looking

[retiredcaps]

Re: IBM Thinkpad/Lenovo R500 Power Problems

Also would anyone know what I could get for a replacement for those mosfets.

I have 0% laptop expertise, but findchips.com shows

http://www.findchips.com/avail?part=k0349

[jsmoke]

Re: IBM Thinkpad/Lenovo R500 Power Problems

Thanks retiredcaps I was just looking at ones from digikey. I will order them soon and post back with my results.

[jsmoke]

Re: IBM Thinkpad/Lenovo R500 Power Problems

Just an update I got it working after replacing the 3 mentioned mosfets

[mrwhiteis1]

Re: IBM Thinkpad/Lenovo R500 Power Problems

Does any one have this schematic or know where. to get it.I really need one.thanks