OK

acer aspire v5-572g has a shorted onboard RAM

i have removed pq9 chip and injected 3v 0.5A inside of the board, RAM (onboard) started to warm up.
i have injected 5v 1.75A inside and they got even warmer.

when the charger is attached i only get 2V inside.

could the ram be shorted? can i somehow fix this? can the ram be disabled?

http://elektrotanya.com/acer_aspire_v5_ ... nload.html

ofc, you will have my thanks and a little donation ;)

Greetings from ur serbian brother

No offence, but it`s foolish act - if high-side mosfet broken, high voltages get to low-voltage rails...
check +1.5VSUS and the other rails

after remove all memory banks
board_id1 R162 -> R151 disable onboard memory

>as i understand, p mosfet will work if the current on the gate is lower then the one on the source?
...voltage on the gate is lower...
, but I think there is very low resistance on VIN line (after PQ9) - need to check

>> (checked, it is little more then 200ohm resistance to ground)

>i did not go above 5v so i do not burn something in the board.
RAM 1.5VSUS, if PQ45 shorted (check it), your 5V go to 1.5V. There are also lots of capacitors 2.5V (see the scheme)... Don`t do that )

>> thanks for the tip :)

Remove Pl13 and measure resistance in both points ( i have did that already and had over 0.45kOhm on one side, and on other side pc156 pc165 i had only 94 Ohm to ground...

so now, should i remove every single capacitor next to ram and check them ? or is the ram chips shorted?


thanks for the advice


ps. i think pq45 is shorted. im going to remove it to test,...