i see the problem 3v is missing on PL402...PU401 pin number 11 read 4.34v and pin 12 read nothing...please help how to diagnos this
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Re: acer aspire es1-420 no power
What is the voltage to ground of pin #17?
That is the 3v LDO rail.
Next, remove all power. Meter in resistance mode. Measure the resistance to ground of the missing 3v switching power rail at the inductor / coil (PL402). -
Re: acer aspire es1-420 no power
So the output of this rail is not shorted but is not being enabled.
With no power, measure the resistance to ground of pin #12.
Can you link or post the schematic for this laptop model?
Who is driving pin #12?Comment
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Re: acer aspire es1-420 no power
Check the charger IC at PU301,
REGN pin
ACDRV pin
ACOK pin
VCC pin
Measure the voltage to ground of each pin as a confirmation.
Does this laptop work with only a pre-charged battery?Comment
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Re: acer aspire es1-420 no power
4 (ACDRV) - 25V
5 (ACOK) - 3.2V
16 (REGN) - 5.9V
20 (VCC) - 19V
i dont know if this laptop work with only battery, i dont have any extra battery for this model....but my customer said this laptop woking normally before...problem happen after he replace hdd to SSD and adding ram 4gb...but before got no power, my customer said this laptop can turn on and power indicator all working but no display on screen...after that laptop suddenly turn off it self and cannot turn on at allComment
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Re: acer aspire es1-420 no power
Pin12 of PU401 is enabled by EC_ON released from SIO. So the focus should be on SIO's basic requirements check like VCC/AC_IN/RSMRST#/EC_RST#/LID SW# etc. Unless and otherwise SIO's requirements are fullfilled, it wont release EC_ON.Comment
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Dear All,
Please really2 need Help on this Acer A515-52G Motherboard Compal EH5AW LA-G521P Rev: 1A.
At first this laptop can on, keyboard light on but no display. Open the motherboard, found out the PQZ3 Mosfet and PUZ3 ic near it burn. Refer picture below. Then I replaced both. All the power rail 3.3,5,1.2, 1.35, 0.8V have power back after i turn on the laptop except for the VCC_GT rail. Voltage at Power Supply showing 0.000A before turn on, after turn on it became 0.5 0.6A. Seem cannot boot and still no display. Then I replaced the PUG1 and mosfet, but the VCC_GT still no power....
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