Hello guys, I need to remove password from this bios dump. Thanks in advance
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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
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Apple MacBook Pro and iMac Schematic & Board Vie
A2991 2023 820-02935 16 M3
A2780 2023 820-02652 16 M2
A2439 2021 820-02009 iMac 24... -
Hello. Got an iMac after a power surge. The PSU survived, but the motherboard did not. Symptoms - after connecting the power, one LED (the rightmost one) lights up, 3.28-3.3v hangs on all legs of the bios flash drive, except for 4. The PCH is heated, low resistance PP3V3_S5 - 30 ohms, PP1V05_S0_PCH - 10-15 ohms. Powered through laboratory power supply 3V 1A to PP3V3_S5, the hub heats up wildly. USB data lines have the same resistance, not underestimated. There is no response to the power button.
PP12V_S0 - 0.05V (should be 0), PP1V05_S0_PCH - 0.5V (should be 0)
I've checked...10-22-2022, 04:10 AM -
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 -
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
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