t43p don't charge battery

[SMA]

As I have said earlier, I do have a little more information. Here it is link

[AdaSch]

As I have said earlier, I do have a little more information. Here it is link

WOW!,

thx, now i can check where i loose power or maybe stering signal is wrong


after shortcut second from left TPC8014 charge starts thanks, but problem is - no steering signal on G LEG

do you know what steering this?

cheers

[SMA]

I realize now, that I should have assigned some numbers or names to those mosfet's. To make it easier to refer to them.
But if I am not misunderstanding it, then the mosfet that you have been shorting is actually supposed to be closed.
Shorting that one will provide a direct current flow from the DC-IN to the battery pole. Not a good thing for the battery to be charged at 16V. You may have harmed your battery already by doing so.

Shorting mosfet's is not a good idea. Measuring voltages is much safer. That said, of course you can do what you like, it is your ThinkPad.

In trying to understand these mosfet's it might help to think of them as switches or relays. They will be either on or off.

Note that the 'System DC' is supplying power to run the ThinkPad.

Except for a few, I do not know where all the Gate signals are coming from, but I will expect them to be derived from signals coming from the TB62501F chip, which can be found at the top side of the board, below the mPCI card.

[AdaSch]

Hi,

i found 2 errors

1. first leg (vcc) ADP3806 is connected by 10ohm 0402 resistor do main power (16v) my resistor don't have 10ohm but many kohm (i think, is burned after overload)

2 after replace resistor charge still don't work because 23 leg don't give good signal (is 1,4v; should be near 15v) to mosfet gate. After short 24 and 23 legs (battery voltage and mosfet gate) charge is starting. Tomorrow i try replace adp3806.

digram be very useful but i lost many time when search why on 1 leg is only 12v. diagram don't have 10ohm resistor. i found him on typical application (from analog website)

V large thanks!

p.s.
when replace adp i give info on forum


edit

hi,

i relace resistor, adp3806 and mosfet after adp. now all work

thx

[supersebas]

Hi... just a question, after you replace f3, the system boot up with the new sxga screen?
I'm asking you because i have the same problem, when trying to exchange the xga to sxga f3 blew up.

[AdaSch]

yes, system start without problems.