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Acer Aspire V3-571G (LA-7912P) Not power on
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kandyan [ 23 апр 2014, 22:15 ]
Заголовок сообщения:  Acer Aspire V3-571G (LA-7912P) Not power on
I have Acer Aspire V3-571G (LA-7912P) which is not functioning properly.

01. There is 3.3v and 5v present
02. No SUSP# and SYSON

When i pressed power button laptop power on for few seconds and turn off.

Since there is no SUSP#, I suspect there might be a problem in both ROMs U42 and U36.
Still I am not re program BIOS and could you please tell me which ROM chip i must re-program?
kandyan [ 24 апр 2014, 08:33 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
help me plz...anyone?
kandyan [ 24 апр 2014, 22:19 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
I reprogrammed the BIOS but problem exist? any ideas?
jurmala [ 24 апр 2014, 23:03 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
plz :-) http://vlab.pp.ru/viewtopic.php?p=59795#p59795

In English:

0. When BIOS & EC-firmware 100% are working
1. When EC power is present, his quartz working and EC reading the bios data (look data exchange on BIOS chip an oscilloscope)
2. When ACIN = 3.3V
3. When LID_SW# = 3.3V
4. When EC drop RESET from SouthBridge, т.е. EC_RSMRST# = 3.3V
5. When by pressing of the power button the signal ON/OFFBTN# falls to zero and the same signal is broadcast in PBTN_OUT#
6. When from the SouthBridge signals PM_SLP_S3# and SLP_S5# are drop, i.e. voltage on them will be 3.3V
Under these conditions EC should give command for start.
orbit [ 25 апр 2014, 01:28 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
kandyan писал(а):
I reprogrammed the BIOS

Что именно и в какие микросхемы вы программировали?
Там есть несколько вариантов.
kandyan [ 25 апр 2014, 12:27 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
jurmala писал(а):
plz :-) http://vlab.pp.ru/viewtopic.php?p=59795#p59795

In English:

0. When BIOS & EC-firmware 100% are working
1. When EC power is present, his quartz working and EC reading the bios data (look data exchange on BIOS chip an oscilloscope)
2. When ACIN = 3.3V
3. When LID_SW# = 3.3V
4. When EC drop RESET from SouthBridge, т.е. EC_RSMRST# = 3.3V
5. When by pressing of the power button the signal ON/OFFBTN# falls to zero and the same signal is broadcast in PBTN_OUT#
6. When from the SouthBridge signals PM_SLP_S3# and SLP_S5# are drop, i.e. voltage on them will be 3.3V
Under these conditions EC should give command for start.

Good point I checked some of these voltages but i missed few. I'll let you know the results.thnx
kandyan [ 29 апр 2014, 16:01 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
BIOS and EC flashed but no success. I suspect EC is bad but i dont have the chip right now for testing.
orbit [ 30 апр 2014, 00:28 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on
Озвучте напряжения на cpu в момент включения и сопротивление на шинах питания cpu и gpu.
Так может быть как при не исправном cpu и его цепей питания, так и при не исправном gpu.
В любом случае EC предпочитает отключить ноутбук.
kandyan [ 07 дек 2014, 11:52 ]
Заголовок сообщения:  Re: Acer Aspire V3-571G (LA-7912P) Not power on  [РЕШЕНО]
After I reballed the PCH SUSP# and SYSON signals are back and laptop turned on. I think dry contacts on PCH is the problem. I use this methode to repair dead laptops such as Acer V3,E1 , Dell 3521, HP 15n.
Thanks for helping me.
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