lenovo g50-70 nm-a272

[abbas_govani]

hey guys,
i have aclu1/aclu2 nm-a272 board.
with no power. i check with board step by step. there was a heating part which is SY8206B PU904.
I replace but same problem. then i saw there is 2 ohm resistence on PJ304 WHICH IS +3VLP. after removing that jumper there was no short on +3vlp side but it is on +3VL side. i tried to find the trace but couldnt.
if any one can please help.

[subroto]

Re: lenovo g50-70 nm-a272

Add the jumper and pick up the audio chip. I found this problem earlier. Some times it may be the card reader controller.

[abbas_govani]

Re: lenovo g50-70 nm-a272

hi subroto bro.
thanks for advice.

lifted sound ic but same problem.
and memory card reader and its ic is on daughter card. so no concern.

[mielta]

Re: lenovo g50-70 nm-a272

Hi
you must remove the jumper and than connect an lap powersupply with 3v on +3vl
and than you must check of heating components.
it can be an cap or SIO Chip.

[subroto]

Re: lenovo g50-70 nm-a272

Then start with SIO.

[abbas_govani]

Re: lenovo g50-70 nm-a272

with pj304 jumper ON pu904 heating and without jumper noting heating.
on sio chip pin 109 there is 10k resister. one side connected to pj304 which is short and other side to sio whic is ok.