Lenovo T430 doesn't power on with battery

[Andreasbest]

Hello
I have a Lenovo t430 that charges the battery, works fine with adapter BUT doesn't work with battery only.
Tried 3 batteries (that work fine in other Lenovo t430) and 2 chargers so i guess i have problem in motherboard.
I strip off the whole laptop and now i have the motherboard with heatsink in bench ready for repair.
I have power in F12 (11,5v) but after that it gets a little complicated for me (page 73 has the whole battery input circuit)
Schematic attached
Thank you in advance!

[Techtiger]

Re: Lenovo T430 doesn't power on with battery

Check pin 3/4 data clk 3.3V , what Voltage you get L5 Coil? U7 pin 6 7 8 5 15 Voltage with battery insert ?

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

in which part?

[Techtiger]

Re: Lenovo T430 doesn't power on with battery

in which part?

Page 73 battery connector

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

What i don't understand is the "Check pin 3/4 data clk 3.3V"
You want to check pin3 and pin 4 on battery connector?
Also what is the data clk 3.3v?
L5 has 0v in both pins
U7 has 0v in pins 5 6 7 8 15
All measurements with battery only, fully charged.

[digitalpc]

Re: Lenovo T430 doesn't power on with battery

Check mosfet output of battery connector

i think is Q8 page 73

[piernov]

Re: Lenovo T430 doesn't power on with battery

Is battery percentage reported correctly under Windows?

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

Q8 has
pin1: 11.6
pin2: 11.6
pin3: 11.6
pin4: 0v
pin5: 11.6
pin6: 11.6
pin7: 11.6
pin8: 11.6

I also measure the Q 34 and i got:
pin1:10,7
pin2: 11,2
pin3: 11,2
pin4: 11,2
pin5: 0
pin6: 0
pin7: 0
pin8: 0

[mcplslg123]

Re: Lenovo T430 doesn't power on with battery

What i don't understand is the "Check pin 3/4 data clk 3.3V"
You want to check pin3 and pin 4 on battery connector?
Also what is the data clk 3.3v?
L5 has 0v in both pins
U7 has 0v in pins 5 6 7 8 15
All measurements with battery only, fully charged.

Pin 3/4 of battery connector are data/clock pins which is part of smbus and is connected to kbc/sio chip. Btw, i think they are fine as battery is charging correctly.

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

Actually pin 3 and 4 have no voltage at all.0v.
i repeat all measurements with battery only.

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

Any advise? Please!

[Techtiger]

Re: Lenovo T430 doesn't power on with battery

Any advise? Please!

check the supply in pic

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

I think i found the problem.
The F9 fuse is blown, now the question is why blowned
Also i see that the P/N is ERBRD0R50X how many mA is this?

[mcplslg123]

Re: Lenovo T430 doesn't power on with battery

Erbrd0r50x=0.5a

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

I have some thread 0.5A @ 220V
May i use this?

[mcplslg123]

Re: Lenovo T430 doesn't power on with battery

yes but its risky if anything is wrong in the circuit. Make sure to measure resistance on both ends of the fuse.

[Andreasbest]

Re: Lenovo T430 doesn't power on with battery

Yes i already did it, no shortcircuit to the ground so i applied some 500mA thread over the fuse and everything worked like a charm.
Charges battery, working with battery and with charger.
Thank you all for you help, i own beer when you visit Greece!!!