Re: P71EN0 REV. C no power on
ICH is a master piece on the power sequence. Try to apply a moderate heat in the south bridge for approximately 30 seconds using a heat gun or a SMD rework station. If after the test the laptop works again.....reballing it.
sorry the poor english and good luck
infosquadsn
New Member
Last Activity: 01-18-2025, 10:49 AM
Joined: 11-06-2013
Location: San Nicolas de los Arroyos
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Re: Toshiba A300 turns off after 10 secs
What is the mainboard model ?
Could be a overheat protection circuit issue or even a BGA problem on the southbridge.
Sorry my poor english and good luckLeave a comment:
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Re: Acer aspire 4736z KALG0 LA449P (not turning on)
In normal conditions, when the power button is pressed, the EC controller got the ON/OFF signal and response with EC_ON signal, this one will activate the Q122 and kill the 17V line (51ON#), in that moment you will be permanently 3V on the power button.
Check the U57, change or rewrite it. This flash memory brings the code that is used by Ec controller to work.
sorry my poor english
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