acer d257 ZE6 power goes off after a new sec.

[rickybucalan]

hello guys. need some help. i got this problem with unknown issue
it goes on and after a new sec or more it goes off. its appears logo on screen.
it has 3.3v and 5v alws.

[rickybucalan]

Re: acer d257 ZE6 power goes off after a new sec.

anyone have this diagram tnx.

[meritosari]

Re: acer d257 ZE6 power goes off after a new sec.

link:

[rickybucalan]

Re: acer d257 ZE6 power goes off after a new sec.

hi guy i found something that gets hot on the mother board.
its transistor K72 under nit of CPU. i replace it but it does the same issue it get hot also.

K72 test

pin1 0v
pin2 0v
pin3 6.1v

and i also test AS393 near this transistor

here is my test

pin
1.0v
2.4v
3. 2.3
4. gnd
5.0v
6. 0v
7. .5v
8. 19v

[meritosari]

Re: acer d257 ZE6 power goes off after a new sec.

-check PQ3, PQ5, PQ6.
-pin#2 PU2 (AS393) should be low (0v) after pressing power button due s5_on signal pull voltage VL to ground
-usually i've found ao3409 (PQ3) was leaked or broken

[rickybucalan]

Re: acer d257 ZE6 power goes off after a new sec.

[QUOTE=meritosari;599638]-check PQ3, PQ5, PQ6.
-pin#2 PU2 (AS393) should be low (0v) after pressing power button due s5_on signal pull voltage VL to ground
-usually i've found ao3409 (PQ3) was leaked or broken[/Q

tnx but i cant find the same ao3409 on my old boards. any replacement that i can use? tnx again

[byulo]

Re: acer d257 ZE6 power goes off after a new sec.

[QUOTE=rickybucalan;602499]

-check PQ3, PQ5, PQ6.
-pin#2 PU2 (AS393) should be low (0v) after pressing power button due s5_on signal pull voltage VL to ground
-usually i've found ao3409 (PQ3) was leaked or broken[/Q

tnx but i cant find the same ao3409 on my old boards. any replacement that i can use? tnx again

AO3409 is P-Channel Enhancement Mode Field Effect Transistor you can replace it with AO4407 or AO4435.

[rickybucalan]

Re: acer d257 ZE6 power goes off after a new sec.

[QUOTE=byulo;602512]

AO3409 is P-Channel Enhancement Mode Field Effect Transistor you can replace it with AO4407 or AO4435.

salamat byulo. pero hirap humanap 3pin lng kasi sya tapos ung code nya hindi mismo ung hinahanap mo. meron ako ao4407 pero 8pin eh.

[rickybucalan]

Re: acer d257 ZE6 power goes off after a new sec.

here is transistor code A9TV 3PIN anu kaya pwede

[avgjm]

Re: acer d257 ZE6 power goes off after a new sec.

Hello Guys i have the acer aspire one d257 the problem is no display ... what possible problem of this unit ? thanks..