Toshiba U920T dead, water damage

[dj_ricoh]

Re: Toshiba U920T dead, water damage

My guess is that the mosfet that output the voltage foe battery recieve only 8v on gate and result it output 8v . To find the problem i thing you nees to find why is 8v to gate

[grahamw01]

Re: Toshiba U920T dead, water damage

Hi, thank you, I may be wrong about the 8V, I checked all the fets and there is no voltage on any pins on all 4 when the orange LED is on to say charging. Do you know what the attached chip is? it says 39A303B but I cant find anything on google for this. Pin 1 of this is heavily corroded which is 19V. Most the pins do have a few voltages on them, around 2V to 5V. Could this be the charge controller?

Thanks

[dj_ricoh]

Re: Toshiba U920T dead, water damage

do you see that the pin1 has no pin and leg

[grahamw01]

Re: Toshiba U920T dead, water damage

yea, this chip has no pins though, it has pads that go underneath. Is this chip for charging control, like U6000 on the L855? I would assume if this was broken then the laptop would not work at all, but it works fine just not charing

[dj_ricoh]

Re: Toshiba U920T dead, water damage

yea, this chip has no pins though, it has pads that go underneath. Is this chip for charging control, like U6000 on the L855? I would assume if this was broken then the laptop would not work at all, but it works fine just not charing

you got problems there!

i know its a QFN chip but it needs to go to that cap!
if its pin maybe its 19v what voltage do you got on the cap?

[grahamw01]

Re: Toshiba U920T dead, water damage

you got problems there!

i know its a QFN chip but it needs to go to that cap!
if its pin maybe its 19v what voltage do you got on the cap?

yes the cap is 19V. I thought maybe the 19V is connecting because lots of the other pins have 2V-5V on them

[dj_ricoh]

Re: Toshiba U920T dead, water damage

you need to be 100% sure you got 19 v there.
For this type of repair i suggest a microscope.
Cheap one.
You need to see the solder near qfn chip.
The pin1 its not the only one with problem what i saw in the pic.

[grahamw01]

Re: Toshiba U920T dead, water damage

I am going to remove it and try to resolder it, but I am not sure if this is even to do with charging. If it isn't for charging then it must be okay all ready since the laptop works fine otherwise. I wish I could find out what "39A303B" does

[dj_ricoh]

Re: Toshiba U920T dead, water damage

I am going to remove it and try to resolder it, but I am not sure if this is even to do with charging. If it isn't for charging then it must be okay all ready since the laptop works fine otherwise. I wish I could find out what "39A303B" does

then don`t touch it!
if you can re solder it much better go for it

[grahamw01]

Re: Toshiba U920T dead, water damage

Hi again,

Recently I removed this chip, cleaned the pads and put it back on and it seemed to work. 13V going to the battery and it was charging, but after 1 hour the chip over heated a died, I guess it shorted. I was wrong about the model of this chip, it is a Fujitsu 39A404B (MB39A404B) I can find on ebay 39A404 and 39A404A but no 39A404B anywhere, will one of these be compatible?

thanks!

[m_anwar_55]

Re: Toshiba U920T dead, water damage

hello
I have the same problem with my U920T it's dead and require this ship and I can't find it also . is there any advise please