Re: Toshiba A300 strange problem and Nec Tokin

i've just maded some test to try to debug this motherboard....i've maded some misure to varius Q and U component end misureted some PAD place....
PAD3 - 0v
PAD4 - 0v
PAD6 - 0v
PAD7 - 0v
PAD8 - 5.09v
PAD9 - 19.2v
PAD10 - 19.2v
PAD11 - 3.39v

Q801
Pin 1-2-3 19.2v
Pin 4 12.8
Pin 5-6-7-8 19.2v

Q802
Pin 1-2-3-4 19.2v
Pin 5-6-7-8 0v

Q803
Pin 1-2-3-4 0.18v
Pin 5-6-7-8 19.2v

Q804 ...

Re: Toshiba A300 strange problem and Nec Tokin

i've made another test...whit no results

i've totaly disassembled the laptop..
i've tried in order
to turn on the motherboard only whitout all component,
whitout cpu there'isnt any led and no sign of life....
insering the cpu, the ac led turn on, but when i press on/off button the sign is the same..... all led flash for a little moment whitout fan start, and after a moment all light turn of immediatly.
i've tested all whit and whitout ram(4 different bank)...no results....same problem........

Re: Toshiba A300 strange problem and Nec Tokin

So... how can i test to indentify shorted caps?

Re: Toshiba A300 strange problem and Nec Tokin

in motherboard or video card?

Re: Toshiba A300 strange problem and Nec Tokin

i've tried to put out video card and start pc, but no result....same problem....

what can i do to identify the short?

hello
my laptop show a strange problem....
when i try to turn on, the laptop start only for half second....
the led blinking for a flashing moment and all turn off....
in this very short time, the fan and the hdd never turn on....
if i plug the adapter to recharge the battery, te recharge work perfectly.
this problem is present whit battery and whit AC adapter, whit battery only, and whit ac adapter only.....
i've tryed to change nec tokin whit normal electrolitic caps to make a test whit no result...
now i've ordered smd cap but o don't...

Re: New Members - please post your introductions here

hello
my name is marco from italy,
i'm here because i've found some information to repair some electronic device,
and now i need help with my toshiba notebook.

thank's to all.