Acer aspire 5742z no power / dead

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

what do you mean take it down??mean remove it??

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

can you help me how to test the mosfet in mode?and which pin should i connect the tester in diode mode thanks..

[cephei328]

Re: Acer aspire 5742z no power / dead

can you help me how to test the mosfet in mode?and which pin should i connect the tester in diode mode thanks..

Hi mate, are you still struck with this Acer or did you manage to fix it?

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

help me pls

the board is already shows charging the led is in orange mode but has no power...

[cephei328]

Re: Acer aspire 5742z no power / dead

help me pls

the board is already shows charging the led is in orange mode but has no power...

Hi mate,

If the Motherboard charging LED is orange (Please check current pull up - it should be more than 1 amps) then charging circuit is good. The next thing you need to check Coil PL46 and PL47 for 3.3 and 5 Volts respectively - If yes go to U16 (EC / SIO chip) Check pin 117 :PBTN OUT# it should read 3.3 Volts. If yes press the power button and check Pin 13 (PLT RST) it should give 3.3 volts output for turn ON. If no voltage from pin 13 check SPI bios (re-flash) first and then replaced SIO chip.

Cheers

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

thanks i will check it now i will post the results

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

i think the power button circuit has a problem how can i check it??

[cephei328]

Re: Acer aspire 5742z no power / dead

Check voltage 3.3 Volts on the power button - If yes : press the power button and see the voltage drops to 0 volts - If yes the power button circuit is OK. Check the bios and EC.

Cheers

[cris_carriaga]

Re: Acer aspire 5742z no power / dead





this the diagram of circuit of switch

there is 3v in the r409 and 3v in the ec_on but in the button there is no volts

[cyberhack]

Re: Acer aspire 5742z no power / dead

the button will be short remove button and chq.

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

i already remove the power button..the button is ok i check the voltage in terminal of switch without switch still no voltage

the switch is connected to diode and resistor

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

is there any posibility to power it on without using power button?or is there any terminal to power it ??

[whaldsz]

Re: Acer aspire 5742z no power / dead

in JLED1 connector, momentarily short pin 7 and pin 8.

[cris_carriaga]

Re: Acer aspire 5742z no power / dead

i already short the pin 7 and 8 of jled1 still no power..can i ask which pin should im going to meausre the voltage of power in the jled1,because only pin 1 and 2 shows 3v..

[whaldsz]

Re: Acer aspire 5742z no power / dead

pin 7 should have 3.3v or 17v. if no voltage is found, you probably don't have +3VALW.

[kingchristo]

Re: Acer aspire 5742z no power / dead

I am also having the same problem I'm getting voltage on pin 7 so know power going to the motherboard but the laptop is still dead don't know what to check next

[raajkumar]

Re: Acer aspire 5742z no power / dead

Hi I am having a problem on this same board. 19V input connector shows 19V ok. Led 3 is blinking. On PL42 it show power fluctuation. its going down from 19V to 16V, 13V, 10V, 9V. I found a cap PC1011 is short circuited and i replaced it. but the problem still. I replaced PU17, PU1000 also but problem not solved. anyone having any idea ?

[kobejunior]

Re: Acer aspire 5742z no power / dead

Hello1 I HAVE A PROBLEM WITH ACER ASPIRE 5742 ZG. POWER UP JUST FOR BATERY, PLUG IN AC POWER ADAPTER, NOT POWER UP. POWE BUTTON VOLTAGE IS 20V. ANYOANE CAN HELP ME?