Acer E1-571G No Power

[boyebaran]

Re: Acer E1-571G No Power

a note:just now customer said me before this problem lop top didn't turn on without battery. but charging was normal.(i replaced PU4 for sure)

[boyebaran]

Re: Acer E1-571G No Power

removed PJ1 and PL6 ohm gone to normal...........

[smali]

Re: Acer E1-571G No Power

the problem is not 800 ohms to ground that is normal. if you have spears in parts FETS then replace PQ16 AND PQ18 just for surety.
the main problem is when you remove PQ21 your should have (3.3v and 5v always) must receiving on both coils.
as i said that maybe one FET ( PQ16 and PQ18) is not working if you have spears in parts replace both FETs and check the Gates voltage and post result.
Note...during the testing you must remove only PQ21 permanently till to the time when you receive 3.3v and 5 v on both coil.

a note:just now customer said me before this problem lop top didn't turn on without battery. but charging was normal.(i replaced PU4 for sure)

This may be problem from PU2( LM393).

[boyebaran]

Re: Acer E1-571G No Power

after removing pj1 ,3.3 &5 volt fixed on coil.all part installed in motherboard

[boyebaran]

Re: Acer E1-571G No Power

the problem is not 800 ohms to ground that is normal. if you have spears in parts FETS then replace PQ16 AND PQ18 just for surety.
the main problem is when you remove PQ21 your should have (3.3v and 5v always) must receiving on both coils.
as i said that maybe one FET ( PQ16 and PQ18) is not working if you have spears in parts replace both FETs and check the Gates voltage and post result.
Note...during the testing you must remove only PQ21 permanently till to the time when you receive 3.3v and 5 v on both coil.


This may be problem from PU2( LM393).

tnx smali for your help.one part in +3VALW line have problem.PJ15,PJ14,.PU16 ,.............&pch.i am worry about PCH

[smali]

Re: Acer E1-571G No Power

after removing pj1 ,3.3 &5 volt fixed on coil.all part installed in motherboard

Thats OK now change PU2 (LM393) and install PJ1 and check.

[boyebaran]

Re: Acer E1-571G No Power

this motherboard dont have PU2.

[boyebaran]

Re: Acer E1-571G No Power

Pj11 and pj14,15 and PQ16 ,PQ18 removed no change

[boyebaran]

Re: Acer E1-571G No Power

i tested Pj1 by connecting 3.3 v external and no short and hitting problem on this line.as you say may PQ16 &PQ18 is faulty (faulty under load).

[boyebaran]

Re: Acer E1-571G No Power

replaced PQ16 and PQ18 no change.

[boyebaran]

Re: Acer E1-571G No Power

please help ..................