Lenovo T410 No Power

[dj_ricoh]

hy guys!
maybe this experience what i have encountered yesterday will help someone and won`t lose time on it.

i got this t410 with i5 cpu and this guy told me he got no power on the notebook; nada, nothing , 0 ,null.
like he said he was right because from yesterday lenovo/ ibm its my new enemy.
hp its nr2 :P
i open the lenovo and started with basic stuff try new keyboard , cpu, ram cord(adapter); NOTHING
taking out the dmm ; searching for power to keyboard cuz there is the power button 0 V on all pins :-s whaaaaat?
searching for fuses all good , mosfets all good, it was like the power entered the pin in laptop but it got lost somewhere i could not read any value on the F1 its like the voltage was lost in the case(ground) or something, the adapter still provided 20v on the pin but after the pins on the board it was lost.
NVM after i lost half a day to find something wrong i told the guy to prepare to buy another MOBO cuz i did find a little moisture on the chipset. i don`t have a big ultrasonic bath so i can clean the mobo just in case it was water dmg.
long story short (: i clean the whole mobo with isopropyl alcohol and did a reflow just in case i won`t miss anything.
What do you think happen that little f****r pw up like a champ :O
So never knew that Lenovo will downgrade the quality of the notebooks and come in the same category like all the cheap Q notebooks. pfff
now if i get a notebook with no power at all i`ll start with a reflow

have a good day all and fast repair , i hope this crap info will help someone

[tomodachi]

Re: Lenovo T410 No Power

Yeah, just like you informed that trick worked multiple times when I run out of solutions,
worth to try, at worst case mobo becomes scrap :P

[dycc]

Re: Lenovo T410 No Power

got the same computer and the same fault . will try reflowing all the board and let you know.

looking also for diagram NZM1E-7 .

according to the typical system shematic of the charger(BQ24741) the input mosfets are drive by HOST CONTROLLER .this host perhaps lose connectivity with those mosfet that could explain why reflowing the board is the solution to this issue .

[artois7]

Re: Lenovo T410 No Power

Are you confident enough with a reflow in a situation like this to deem it "fixed" and return it to the customer? All the debate with reflow vs reball is really putting me off reflowing things for customers..!

[dj_ricoh]

Re: Lenovo T410 No Power

you can talk in this case for hours and days but there is one case that you can be sure.
IF the crack on the solder balls manage to give you a problem but the big problems that you need to reball or change the chip, yes you can.

IF it was a isolated case because he overheated the board(GPU,CPU) and he did not care and there was no work done on the board , YES YOU CAN.

[kasimxp]

Re: Lenovo T410 No Power

Other possibility on why this method working is the bios battery was pulled out and left for 1/2 day resulting bios value change to default.

[mrkaushal]

Re: Lenovo T410 No Power

Hi, i have also got to repair lenovo t410 laptop and what i find is Q9 mosfet's does not out drain voltage while source got 20 volt gate voltage is zero .. so, what should i check further pls guide me ...