Re: Toshiba l300 no power
I have checked the power adapter & its fine.
Have replaced the powerjack as this is what initially broke off & i suspect shorted out and damaged something else on the main board.
Thanks for your input
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Re: Toshiba l300 no power
U502 is the battery charge management if i understand datasheet correctly.
So why does it not power from only AC or are the 2 linked?
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Re: Toshiba l300 no power
Pin 12 VCC shows 0.5V
So it seems IC is blown?
Sorry took so long, work had me quite busy.
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Re: Toshiba l300 no power
thanks, will check once at home and post results.
if its not that then im lost.
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Re: Toshiba l300 no power
keep me posted.
I will be replacing the mosfet today and see if anything changes.
All other components seem to be fine so thats all i can think of that could be problem.
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Re: Toshiba l300 no power
Seems like no can help, thanks anyway.
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Re: Toshiba l300 no power
Hi momaka
Here are readings i get with components
Fuses 500/501 = 0
Q500 - 830 / Q502 - 540 / Q506 - 420 / Q507 - 165 (strange is 3 legs across will measure same then last 1 across is higher than 1st 3 reading on all 4 chips) hope u understood that
D500 -148 / D502 - 770 / D508 - 1328 & when reverse multimeter cables on D508 get 165 reading, on all others no reading when reverse cables.
Check all other small components all fine. At least according to me.
Hope you can figure out what ive posted...Last edited by juus; 07-22-2011, 02:49 AM.
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Re: Toshiba l300 no power
Hey there momaka, sorry have been away on work project.
Will get you those results & post in the morning.
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Re: Toshiba l300 no power
Ok so followed instruction:
U502 part #: BQ 24721C TI 83K DTHX G4
FUSE500 & 501 - show no resistance / continuity (LF 15A + LF 8A written on top of fuses)
L500 - shows no resistance / continuity
Q500, 502, 506, 507 - all measure OK
D500 shows no resistance / continuity
R502 measures ok, cannot make out writing looks like 100.
Strange previously fuses showed continuity but i must have done something wrong as i double checked everything again and above are the results.
So from what i...
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Re: New Members - please post your introductions here
juus here. Always been into computers & electronics. Everyday i see as a new learning experience.
Just started my own IT company so more focused on it and repairs now than ever before.
Hope the forum will be a great source of help & making good friends.
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Re: Toshiba l300 no power
here are pics of board top and bottom and area where power is at. Any help would be appreciated....
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Re: Toshiba l300 no power
ok i will disassemble & take pics, although it looks same as the first post.
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Re: Toshiba l300 no power
hi, new here and have same problem. Can you say which caps to check from pics? And where is mosfet located?
I have checked power adapter - works & gets 19v on board at connector. But laptop L300 will not power up or charge. Only battery light will flash 6 times when power button pressed. Any help will be appreciatted.
Thanks
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