Toshiba C640 no charging

[kaisar]

Hi, all i've got toshiba laptop weird problem, with battery Ok but no charging and no power on with adaptor.

best regard

[tibd]

Re: Toshiba C640 no charging

charger ic, change it. common issue.

[kaisar]

Re: Toshiba C640 no charging

thank you sir

[and555]

Re: Toshiba C640 no charging

Hi, all i've got toshiba laptop weird problem, with battery Ok but no charging and no power on with adaptor.

best regard

Please check Q6005/Q6002

[nggit]

Re: Toshiba C640 no charging

hello all, i have this old laptop c640 and the problem is VTT, VCORE voltage blinking, led ac (plug logo) ok, but led (power logo) blinking. 5 and 3v are present. what shoud i check? any help appreciated. thank you.

[crot69]

Re: Toshiba C640 no charging

I have same problem
Replaced charger ic but mosfet voltage goes 3v-8v, LDO 1.6v then 0v, AC detect is ok it show 1.66v but this laptop can run with battery

[mon2]

Re: Toshiba C640 no charging

1) can you link the schematic?

2) which charger IC is onboard?

3) ACDET is too low.

4) check the usual 2*DCin mosfets. If N-channel mosfets, the gate must be ~25v to enable.

Often the 2nd mosfet gets killed.

5) remove the 4k resistor on ACDRV to confirm if gate voltage is not ~25v. A leaky mosfet will the boosted gate voltage down.

[crot69]

Re: Toshiba C640 no charging

Ic : MAX17435ETG
1st and 2nd mosfet are ok (no short)
DCin: 19v
Idk where is ACDRV pin

[mon2]

Re: Toshiba C640 no charging

Remove the battery.

Attach the proper adapter.

What are the voltage to ground readings for the first dcin mosfet? This is AM4410N.

Source
Gate
Drain

ACDET is ok for this charger IC.

[mon2]

Re: Toshiba C640 no charging

With no power, meter in resistance mode.

Check the resistance to ground of the LDO pin #4.

[crot69]

Re: Toshiba C640 no charging

Maybe bad ic connection, i see it not fully filled with tin
And DLO pin show OL when resistance mode and 0v when plug a charger
I will resolder it again

[crot69]

Re: Toshiba C640 no charging

After resolder charger led on but no charger voltage from inductor (low side charging mosfet gate 0v, resistance 23Mohm and high side charging mosfet gate only 10.43v, resistance 30Mohm and my battery voltage is 10.96v = 0%) also LDO 5.25v but after resistor R6007 only 0.24V