Acer aspire one d257 no power

[ry x hunter]

Hi guys! i have a problem with this netbook acer d257.. no lights anjything..cant power on.. i checked the motherboard and it has no mark of liquid spill and burn..
I download the schematic diagram and here are i found and notice..


thanks

[ktmmotocross]

Re: Acer aspire one d257 no power

Check for always power 3.3v, 5v and vin 19v

[ry x hunter]

Re: Acer aspire one d257 no power

Check for always power 3.3v, 5v and vin 19v

vin-19 volts
3.3v and 5v pin - 0-volt

[lezsimply]

Re: Acer aspire one d257 no power

what do you get on pins 8 and 17?

[ktmmotocross]

Re: Acer aspire one d257 no power

Check for short to ground on pl10 and pl11.f

[atsio]

Re: Acer aspire one d257 no power

What is the voltage on pin 4 of PQ33 and PQ35?

[dellxps15]

Re: Acer aspire one d257 no power

if you dont have 3.3valw and 5valw then you are looking in the wrong schematic diagram. these are voltage that comes up when 3.3valw and 5valw are present.

[ktmmotocross]

Re: Acer aspire one d257 no power

what r u talking abou. u try to tell us that always power on voltage rails cannot be bad?
what r u smoking today?

[dellxps15]

Re: Acer aspire one d257 no power

found the schematics now and see it name always voltage different.

i have an aspire one quanta mainboard and name were different.

[mangtomas]

Re: Acer aspire one d257 no power

i also have a aspire one d257,no 3v 5v alw but good in vin,ive checked pl 10 its ok but pl 11 is shorted to ground,can you please help me?

[fddizon]

Re: Acer aspire one d257 no power

mang tomas,

remove pu3 and retest pl11 to grnd. if short gone replace pu3.
if still shorted, remove pl11 and test which pad is shorted to grnd.
if left pad, check pc135 and FETS pq45 pq47.
if right pad is shorted, check pc118 and pc131

[fddizon]

Re: Acer aspire one d257 no power

hunter,

check upper fets if they receive the same vin signal. if ok
check gate voltage. if high, reflow pu3 or replace

[mangtomas]

Re: Acer aspire one d257 no power

i have the same problem,ive fixed the shorted in 3v/5v alw,resistance is good but when i plugged in the charger theres no 3v and 5v when i checked pl11 and pl10,what might be the problem?

[mangtomas]

Re: Acer aspire one d257 no power

mang tomas,

remove pu3 and retest pl11 to grnd. if short gone replace pu3.
if still shorted, remove pl11 and test which pad is shorted to grnd.
if left pad, check pc135 and FETS pq45 pq47.
if right pad is shorted, check pc118 and pc131

ive already done that,ive replaced the parts with new and working ones but same goes as i plugged in the charger it destroys my pu3 and other parts such as u19 and u22,

[mangtomas]

Re: Acer aspire one d257 no power

new problem,shorted in +3v_s5,please help,thanks

[dragon23]

Re: Acer aspire one d257 no power

thanks you for your sharing..