acer aspire 6920g power problem

[lhock98]

Dear fellows,

i got a acer aspire 6920g having power problem when using ac adaptor or battery my laptop show nothing, no led light totally showing no power to the mainboard, does anyone here have this idea how to fix it?all reply are welcome...thank you

[lhock98]

Re: acer aspire 6920g power problem

after changed the NEC Oe97 cap to 4*330uf cap my laptop still unable to power up, anyone know why??

[leopold1112]

Re: acer aspire 6920g power problem

Measure tension on Q507.

[lhock98]

Re: acer aspire 6920g power problem

thanks for your reply, i can't find the fuse for this board. do you have any idea where is the fuse located at?

Measure tension on Q507.

[leopold1112]

Re: acer aspire 6920g power problem

Safety locks aren't present. Keys on mosfets are applied, cope controlers.

[lhock98]

Re: acer aspire 6920g power problem

my board Q506, Q507, Q508 all using same IC 4825p. Q508 4 legs measure 19v other 4 legs showing 0v. Q506 and Q507 only 1 legs showing 19v the rest of the legs showing 0v. it is normal?

Safety locks aren't present. Keys on mosfets are applied, cope controlers.

[twotimes]

Re: acer aspire 6920g power problem

after changed the NEC Oe97 cap to 4*330uf cap my laptop still unable to power up, anyone know why??

my 6920g the led will light up but won't boot. only flashing on/off the power led indicator. no display at all, total black screen.

btw where is this NEC Oe97 cap located?

[degutji]

Re: acer aspire 6920g power problem

after changed the NEC Oe97 cap to 4*330uf cap my laptop still unable to power up, anyone know why??

OE97 = 900uF ( mod caps 2 * 470uF 2.5v )
OE128 = 1200uF ( mod caps 4 * 330uF 2.5 )

So , are you sure Nec OE097 can be use with 4 * 330 caps ?

[parthiz]

Re: acer aspire 6920g power problem

hi my acer aspire 5740 laptop is no power and no light how to find the problem in my lap
how to chck the companant and ic plz ..

[Francisco.s]

Re: acer aspire 6920g power problem

my board Q506, Q507, Q508 all using same IC 4825p. Q508 4 legs measure 19v other 4 legs showing 0v. Q506 and Q507 only 1 legs showing 19v the rest of the legs showing 0v. it is normal?

Q508 is a mosfet with an internal diode properly polarized to conduct. So if you have 19v. applied to pins 5,6,7,8 and have nothing in pins 1,2 and 3; this mosfet is bad. you have to replace it.

[ryogadan]

Re: acer aspire 6920g power problem

Hi to all.
I have a 6920g with power issues.
When i plug the AC power adaptor i can see the light of two blue led near the power button, but when i press the button nothing else happens.
I have tried with several power adaptors and i have tried with only the battery...when i press the power button nothing else happens.
I have read the precedent posts and i have tested the voltage on Q508 and Q507: i have 19V on 1,2,3 pins, i have 19V on 5,6,7,8 pins and 13V on pin 4.
On Q506 i have only 19V on pin 1,2,3,4.
Do you have some ideas?
Thanks.

[Tuomo]

Re: acer aspire 6920g power problem

Hi to all.
I have a 6920g with power issues.
When i plug the AC power adaptor i can see the light of two blue led near the power button, but when i press the button nothing else happens.
I have tried with several power adaptors and i have tried with only the battery...when i press the power button nothing else happens.
I have read the precedent posts and i have tested the voltage on Q508 and Q507: i have 19V on 1,2,3 pins, i have 19V on 5,6,7,8 pins and 13V on pin 4.
On Q506 i have only 19V on pin 1,2,3,4.
Do you have some ideas?
Thanks.

This looks ok, so next check 5V and 3V always.

[tatpcit]

Re: acer aspire 6920g power problem

Measure tension on Q507.

Thank you.