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
Any help?
LED1 is ON, LED2 is blinking
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Last edited by Pragmatiko; 07-26-2016, 05:23 AM. -
Re: Apple A1311 won't turn on.
try check with a charged battery -
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.Last edited by cyberhack; 07-26-2016, 09:09 AM.Comment
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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 voltsComment
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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 itemComment
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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 offComment
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Re: Apple A1311 won't turn on.
ok then inject 12 volts on pin 2Comment
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Re: Apple A1311 won't turn on.
Done and try to turn on but nothingComment
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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_OKLast edited by cyberhack; 07-27-2016, 07:59 AM.Comment
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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.Comment
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Re: Apple A1311 won't turn on.
When i put 12volt on pin 2 turn on and fan go to maxComment
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Re: Apple A1311 won't turn on.
Looks like power supply,have a look at this see if it helpsAttached FilesLast edited by cyberhack; 07-28-2016, 03:25 AM.Comment
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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).Comment
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Hi there,
I'm looking for anyone who might have information on Apple's embedded Apple Watch charging daughterboard, ID 820-02601. This is currently used by Anker in their Apple Watch charging products, but likely by other Apple partner brands as well.
You can see the board referenced in ChargerLab's teardown of the Anker Y1811 3-in-1 MagSafe cube - they discuss the "Apple Watch wireless charging circuit" about 2/3rds down the page. It's not pictured, but the board ID reads 820-02601-A, which sure sounds like Apple.
This daughterboard uses an interesting...04-21-2025, 11:41 PM -
Hi guys, I have this 2011 iMac A1311 with a strange problem.
Most of the time, when I plug in the power cord, the first of the 4 LED's turn on, but when I press the power switch the LED turns off and iMac won't boot up.
Sometimes, when I unplug and plug the power cord back in, iMac starts up correctly by turning on the 4 LEDs in sequence.
I have already tried a new power supply, but the result does not change. Do you have any suggestions?
Motherboard 820-3126-A -
Hello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited... -
Main board : 820-3126-A
Power : OT8043-290H R03BE9-0008I- apple P/N: 614-0444
EMC 2428
Problema , alla pressione del tasto power(S5010) tutto spento , led 501acceso .
Sui pin dell'alimentatore sono presenti :
Pin 6 4v6
Pin2 12v
Sul pulsante power sono presenti 3v3 , che alla pressione si genera il segnale SMC_ONOFF_L , il quale va al pin 104 di U4900 = H8S2117 LFBGA
ho difficoltà nel capire quale sequenza , quando arriva il segnale SMC_ONOFF_L, deve
eseguire U4900 per attivare l'alimentatore
... -
Hello guys, I need to remove password from this bios dump. Thanks in advance...
Comment