Toshiba L510 no power at all

[john76b]

hi, i have toshiba L510 ,laptop totally no power no signal, even AC plug in and battery installed, before it become so serious damage,it will auto shut down often by itself, ad later totally gone on the next day,
cpu checked ok, Ram ok, hard disk ok, NEc 128 tokin been replace, AC adaptr 19V ok,but still no power and no signal at all.
i believe there is motherboard problem ,but dont know which part of component is faulty.kindly advise if someone know how to resolve it,

[RobRocks]

Re: Toshiba L510 no power at all

Hello, use a regulated power supply with display and check if the laptop draws any current, while on charger with no battery and powered off. If any higher current than 0.01A flowing there might be a short somewhere, you should feel some heat around the faulty part. If not check if 19v reaches all the power ic and mosfets, then check 3.3v and 5v. If everything ok, check pins ouf the bios and the kbc acording to schematics, maybe replace bios ic. No power on if voltages are ok mostly bios ic - kbc or southbridge. you can also try and reflow the southbridge, but its possible that kbc or southbridge is gone.

[ben7]

Re: Toshiba L510 no power at all

Sounds like it was overheating! Was the heatsink clogged with dust?

[aspire550z]

Re: Toshiba L510 no power at all

in my laptop..i change u803(bq24721c) and q6002(fdmc8884)=shorted......but i think if 3v and 5v are present...this is not an issue....

[klangsotan]

Re: Toshiba L510 no power at all

hi all ,
i'm newbie and i need schematics toshiba L510 with board view lay out please

thank's alot before