Apple A1311 won't turn on.

[Pragmatiko]

When i plug ac cable fan seem turn on but after 2 seconds turn off and start again. Screen remain black.

Any help?

LED1 is ON, LED2 is blinking

[alihomee]

Re: Apple A1311 won't turn on.

try check with a charged battery

[Pragmatiko]

Re: Apple A1311 won't turn on.

try check with a charged battery

it's an all in one computer

[cyberhack]

Re: Apple A1311 won't turn on.

Here is where i would start go to page 1 i would look at PP12V_G3H

LED #2

• Indicates that logic board has detected power from power supply when computer is
turned on. This LED will be ON when computer is turned on and power supply and voltage
regulators are working correctly.

got that from the manuel.

[Pragmatiko]

Re: Apple A1311 won't turn on.

Have 12 volt on pin 1 of J600 and incostant voltages on pin 2 and 3 of J600 about 2 volts

[cyberhack]

Re: Apple A1311 won't turn on.

Have you removed the hdd ,screen to test.on page 6 the voltage goes to a number of things.Check for bown item

[Pragmatiko]

Re: Apple A1311 won't turn on.

Yes removed all,just power supply and logicboard. I have checked all, no short, reflashed bios and removed GPU card. Seem want turn on,fan start for 1 second and then go off

[cyberhack]

Re: Apple A1311 won't turn on.

ok then inject 12 volts on pin 2

[Pragmatiko]

Re: Apple A1311 won't turn on.

Done and try to turn on but nothing

[cyberhack]

Re: Apple A1311 won't turn on.

What voltage do you get @ pin2 is it 12volts or goes low when injected
and can you check that you have PP12V_S0_VG_OK

[Pragmatiko]

Re: Apple A1311 won't turn on.

What voltage do you get @ pin2 is it 12volts or goes low when injected
and can you check that you have PP12V_S0_VG_OK

you mean pin2 of J600?

on pin2 i dont have 12v but 0,7 to 2V variable

[cyberhack]

Re: Apple A1311 won't turn on.

ok then when you inject 12volts on pin 2 what happens does thte voltage stay up or go down ie we are looking to see if there is a short on that rail.

[Pragmatiko]

Re: Apple A1311 won't turn on.

When i put 12volt on pin 2 turn on and fan go to max

[cyberhack]

Re: Apple A1311 won't turn on.

Looks like power supply,have a look at this see if it helps

[Pragmatiko]

Re: Apple A1311 won't turn on.

UPDATE: i have replaced logic board and work, then also if can see a power block issue the problem is logic board. (i dont know what).