Hi, Need boardview and schematic of iMac A1311 EMC 2389 Mid2010
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Answer selected by Melania Ulibarrie at 04-19-2025, 08:30 AM.
Hope this helps -
Find the 820-**** for your logic board. It will be etched on the board somewhere. Use it to search this forum as the requested files may already be posted here.
As an example, see the following variations of logicboard models in my database. Most likely the files are already here.
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Hi! is 820-2784-A, I can't find it on the forumComment
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Hope this helpsComment
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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 everyone,
Some time ago I acquired an imac computer model A1311 that does not boot (motherboard ref. 820-2494-A).
The power supply is working properly (I have two), it delivers the 12V on pin 4 of the power connector (PP12V_S5).
As I have the schematic diagram and the boardview, I have made a series of measurements, obtaining the following results:
PP12V_S5 -> 12V
3V3REG_VCC -> 3.12V (something low?)
PP5V_S5_LDO -> 0.02V
3V3REG_VCC -> 0.0066V
I have also measured the resistance to ground on the coils, and I can't find... -
Hi all.
I have an ongoing issue with a 2010 A1311 21.5" iMac. It starts up, chimes, lights up and boots to the OS, however the screen starts to lightly flicker, steadily getting worse before switching off altogether. Measuring the voltages reveals that the 12v rail drops to around 10.5v once the Mac is switched on.
Until yesterday, I wasn't sure if the problem lay with the PSU, the backlight inverter or the logic board.
Yesterday, however, I borrowed a good PSU and the iMac works fine.
Hence my opening a new thread within this troublshooting... -
DEAR ALL
i have the above board,, when i power on led604 does not come on. i do have PP3V3_S0, which goes across resistor R604.here i have again 3.3v,then does to led604. The lead of the LED that is connected to Q602 D-S i get 1.9v is that correct!
on Gate which is MXM_GOOD i get 0v which is connected to PCH ic.
is my problem the PCH IC!
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Hi all guys, I received this imac in which the usb ports don't work, all of them and if I connect the displayport without the internal monitor, I have nothing on the video output.
If I connect the original internal moditor, the imac turns on and works correctly and hangs on the login screen because the keyboard and mouse do not work to enter the password.
I have 5v on the usb ports, in fact the led lights up on the mouse but it doesn't work. Do you have any advice?...
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