Acer Aspire E5-473 Not Turn On

[dqtech]

5v sometimes present and sometimes not....when 5v present this laptop can turn on normally....any ideas what could be the problem?

[mcplslg123]

Re: Acer Aspire E5-473 Not Turn On

Check pin12 for 5V_EN is present or not when you are not getting 5V on PL404.

[dqtech]

Re: Acer Aspire E5-473 Not Turn On

Check pin12 for 5V_EN is present or not when you are not getting 5V on PL404.

on 5V_EN only got 3.3v sir

[dqtech]

Re: Acer Aspire E5-473 Not Turn On

i just let the laptop turn on normally and after around 30minutes it goes to shutdown itself....and now 5v missing and pin 12 get only 3.3v

[harshana]

Re: Acer Aspire E5-473 Not Turn On

i just let the laptop turn on normally and after around 30minutes it goes to shutdown itself....and now 5v missing and pin 12 get only 3.3v

Pin12 just only need Enable signal. So its okay to have 3.3v on it. what it the resistance of PL404 to ground? (you should test this without power)

[dqtech]

Re: Acer Aspire E5-473 Not Turn On

Pin12 just only need Enable signal. So its okay to have 3.3v on it. what it the resistance of PL404 to ground? (you should test this without power)

red probe on ground read 18K Ohm
black probe on ground read 80K Ohm

is this correct?

[harshana]

Re: Acer Aspire E5-473 Not Turn On

red probe on ground read 18K Ohm
black probe on ground read 80K Ohm

is this correct?

Seems okay. from where you test 5v rail??

test voltages of all the pins on pu402 and post them.

[mcplslg123]

Re: Acer Aspire E5-473 Not Turn On

Since 5V_EN is always present and the resistance on output coil is healthy-There can be two scenario's
01.The PWM ic is bad,corroded,missing track, resistor changed value
02.Feedback is not correct.

[dqtech]

Re: Acer Aspire E5-473 Not Turn On

Since 5V_EN is always present and the resistance on output coil is healthy-There can be two scenario's
01.The PWM ic is bad,corroded,missing track, resistor changed value
02.Feedback is not correct.

ya you are right, PWM ic is bad....im waiting for replacement...order from china

[LeMMino18]

Re: Acer Aspire E5-473 Not Turn On




ya you are right, PWM ic is bad....im waiting for replacement...order from china

Hi did you manage to repair it?

[dqtech]

Hi did you manage to repair it?

yes...replace PWM ic