iMac Intel 27" EMC 2429 Power Supply voltage values?
Where can I find the pin diagram with voltage values so that I may test the power supply? thank you
Is PIN 1 the bottom left?
좋은 질문입니까?
Where can I find the pin diagram with voltage values so that I may test the power supply? thank you
Is PIN 1 the bottom left?
좋은 질문입니까?
Here’s the info on the pinouts: Won't power up and only 1 diagnostic LED
Give @oldturkey03 an upvote if it helps.
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Thank you Dan, much appreciated!
Pin 1 Ground
Pin 3 5V power for Hard Drive(s). Note: If present, the 12V power will come directly from the Power Supply to the Hard Drive thru the power harness cable.
Pin 4 Standby 12V power (permanent power coming from power supply and present as long as AC cable is connected, even if computer is off); corresponds to LED #1
Pin 6 Backlight Control pulse width modulated signal (from logic board to LED backlight board, to adjust the backlight level setting according to user setup)
Pin 11 12V Run-Mode power to logic board (coming from power supply, present as long as system is on or asleep); corresponds to LED #2
Pin12 Power On Request signal (from logic board to power supply when power button is pressed)
Pin 13 Backlight Enable (signal from logic board to Backlight Controller board, to enable backlight
"Press power button and Verify if system turns ON. You may alternately check for presence of a 12V DC signal between pin 11 and pin 1 of logic board when power button is pressed."
Just connect the power supply and then measure it on the logic board side. That way you know that the logic board gets all the voltages from the power supply. Use the image from the answer on here Won't power up and only 1 diagnostic LED
You can also trace the wire from the connector to the logic board to detrmine the pins on the power supply, by using the same image
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Hi,
I success to use the originals PSU and inverter with the Chinese controller (I put also a 3,5 HDD inside to make backup). I use à Arduino Nano to control the brightness.
You need to buy a 12v->5V converter for the Arduino. I have make a little code to convert the 5-0V(low to hight) signal of the Chinese controller to a correct signal PWM (5V, 13kHz) for the inverter. It'a now possible to use the native brightness control of the Chinese controller.
With the code I make, yon have to connect the BLO of the controller to the pin 1 of the inverter, and the ADJ to the pin 3 of the inverter.
Sorry for the syntax, I'm French.
#include <TimerOne.h>
int var=0;
void setup()
{
pinMode(9,OUTPUT);
Timer1.initialize(86); //100us = 10khz
Timer1.pwm(9,800); // 50% DC
pinMode(A2, INPUT); // déclarer la broche 2 comme entrée
Serial.begin(9600);
}
void loop()
{
var = 1023-analogRead(2);
Timer1.pwm(9,var);
delay(1000);
}
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Thanks for the tips. I am trying to do the same thing that you just did. I saw you left the iMac speakers in the housing. are you using them for the HDMI audio?
Hello Frédéric. Could you share in more detail, how you connected the Arduino nano and how you power up the inverter and the PSU? I would be very grateful.
Bonjour Frédéric.
Je suis en train de faire la même chose que toi sur un iMac 27" mid-2011 A1312 EMC 2429 et je pense proposer un tuto complet prochainement.
J'ai bien noté que tu connectais :
- BLO du contrôleur chinois à la broche 1 (BL_ON) de l'inverter de l'iMac
- ADJ du contrôleur chinois à la broche 3 (PWM) de l'inverter de l'iMac
Mais je ne vois pas l'Arduino entre les deux dans tes explications ?
Donc, pour moi c'est ADJ du contrôleur sur la broche A2 de l'Arduino et sortie 9 de l'Arduino sur la broche 3 (PWM) de l'inverter de l'iMac, si je ne me trompe pas.
Pourrais-tu me donner quelques explications complémentaires ou confirmation ?
Merci beaucoup.
Any sucess on this, I want to make this but it has little information
Bravo pour cette réalisation, je serais moi aussi preneur d'explications plus détaillées. Merci d'avance
Après plus d'un an de travail, voici le tutorial complet pour transformer son ancien iMac Intel 27″ A1312 en moniteur pour Mac ou PC en 2560×1440 60HZ :
https://stephane-chevassu.fr/modifier-un...
After more than one year of work, here is the complete tutorial to transform your old iMac Intel 27″ A1312 into a monitor for Mac or PC in 2560×1440 60HZ :https://stephane-chevassu.fr/en/convert-...
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Thanks for that info. I have one of the many 27” iMacs with blown GPUs, and I’m converting it into a monitor with a cheap driver board off eBay. But I want to use the original PSU and inverter, not the cheap one (which, based on reviews, doesn’t drive the backlight with original brightness).
I have a pinout that's probably right, but I'm not sure what some of these abbreviations mean:
http://hqlaptoprepair.co.uk/imac-a1312-p...
Can you give me a description of the non-obvious ones? Thanks!
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I'm also converting a 27" mid 2011 imac into a monitor and was wondering what did you end up doing? Because I would love to reuse the original psu and the inverter to achieve maximum brightness.
Pleaselet me know
Kind regards
Any luck with this? Want to do the same with the original PSU and inverter!
Me too! Have a controller board for the lcd but would love to use the original inverter and psu!!
I'm also in the middle of this. I don't know what you mean by "except the obvious". But I think that the SMB ones, (pint 10, 2 and 3) 5V connector for the Hard drive and optical driver. Let's keep us posted on this project !
I am also trying to use the APPLE Backlight Inverter Bd instead of the CHINA Backlight Inverter bd to solve the BRIGHTNESS issue.
on PWM signal, I just used 3v DCin (I ordered a PWM generator to supply 13kHz, 3V)
not sure why I am only getting 12.51 Vout when using the APPLE Backlight inverter bd.
LCD - NO BACKLIGHT
3.) iMac with Apple Inverter, no PSU and no LogicBoard
INVERTER VOLTAGES
Vout 12.51V (CN2.1)
Vin 12.58v (CN1.2)
ENA 3.22v (CN1.1)
PWM 3.02v (CN1.3)
LCD - BRIGHTNESS LOW (iMac as MONITOR using China Inverter/Driver/Controller)
CA-255 China Inverter board
2.) iMac with China inverter, no PSU and no LogicBoard
INVERTER VOLTAGES
Vout 32.5v (CN4.1)
Vout 87.6v (CN4.1) with LCD disconnected
Vin 11.93v (CN1.1)
ENA 4.64v (CN1.3)
PWM 0v (CN1.4)
LCD -BRIGHTNESS EXCELLENT (Normal 2011 iMac EMC2429)
1). iMac with Apple inverter, PSU and LogicBoard (normal 2011 iMac EMC2429)
INVERTER VOLTAGES
Vout 36.5v (CN2.1)
Vin 11.8v (CN1.2)
ENA 3.22v (CN1.1)
PWM 3.08v (CN1.3)
PSU
Pin 16 GND >> SATA pin 10,11,12 GND_12V
Pin 15 VIN 12V >> INV pin 2 if ON
Pin 14 12V >> MB pin 12 if ON
Pin 13 VIN 12V >> INV pin 5 if ON
Pin 12 12V >> SATA pin 13,14,15 12V if ON
Pin 11 12V >> MB pin 11 if ON
Pin 10 3,3V >> MB pin 13 thin cable if ON
Pin 9 GND? >> MB pin 5
Pin 1 GND? >> MB pin 14
Pin 2 GND_12V >> INV pin 6
Pin 3 >> MB pin 10 half dun 4v when OFF
Pin 4 GND_12V >> INV pin 4
Pin 5 12V >> MB pin 4 always ON
Pin 6 GND? >> MB pin 7
Pin 7 3,3V >> MB pin 2 thin cable if ON
Pin 8 GND >> MB pin 1
Connect pin 3
to pin 2 to power up pin 11, 12,13,14,15
Seems like the photo from oldturkey03 is completely wrong….. correct?
INVERTER
Pin 1 ENA / BL_ON
Pin 2 VIN
Pin 3 PWM
Pin 4 GND
Pin 5 VIN
Pin 6 GND
Seems that pin 1 needs 5V to turn the Blacklight ON.
Has some of you already got it to work with the original inverter? And with or without the original power supply (PSU)?
Please share diagram etc. Thanks!!
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Pinout from oldturkey03 doesn’t seems right to me.
I have done some investigation myself, see picture.
Would like to hear if i’m correct?
Anyone already got it working with the original inverter?
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I am working on this project (iMac 27" A1312 EMC2429) and I will publish a complete tutorial early. Be patient.
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@triniti46340 whenever you are getting to it, publish it as a guide Create a new Guide - iFixit That way the whole community get's to see it.
@triniti46340 I will wait for your help with some sort of guide. Can you right now describe what are you doing with the iMac(ie: using the original PSU or 3rd party PSU with original inverter) many many thanks in advance
Done. Complete tutorial for iMac 27" here :
Hi, is 3.3V on if mb plugged in and pc turned on? From psu only i 'm getting oscillating voltage on pins 7, 10 from 1.2-2.4v. Trying to rule out power supply. Any help appreciated
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I am also trying to use the APPLE Backlight Inverter Bd instead of the CHINA Backlight Inverter bd to solve the BRIGHTNESS issue.
still working on it.
on PWM signal, I just used 3v DCin (I ordered a PWM generator to supply 13kHz, 3V, but not received yet.
not sure why I am only getting 12.51 Vout when using the APPLE Backlight inverter bd.
Here are Voltage measurement I took.
Be CAREFUL - DANGER HIGH VOLTAGE.
LCD - NO BACKLIGHT
3.) iMac with Apple Inverter, no PSU and no LogicBoard
INVERTER VOLTAGES
Vout 12.51V (CN2.1)
Vin 12.58v (CN1.2)
ENA 3.22v (CN1.1)
PWM 3.02v (CN1.3)
————————————————————————————————————————————————————
LCD - BRIGHTNESS LOW (iMac as MONITOR using China Inverter/Driver/Controller)
CA-255 China Inverter board
2.) iMac with China inverter, no PSU and no LogicBoard
INVERTER VOLTAGES
Vout 32.5v (CN4.1)
Vout 87.6v (CN4.1) with LCD disconnected
Vin 11.93v (CN1.1)
ENA 4.64v (CN1.3)
PWM 0v (CN1.4)
————————————————————————————————————————————————————-
LCD -BRIGHTNESS EXCELLENT (Normal 2011 iMac EMC2429)
1). iMac with Apple inverter, PSU and LogicBoard (normal 2011 iMac EMC2429)
INVERTER VOLTAGES
Vout 36.5v (CN2.1)
Vin 11.8v (CN1.2)
ENA 3.22v (CN1.1)
PWM 3.08v (CN1.3)
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Has anyone managed to run the original backlight board with the power supply in the meantime? I managed to run the china controller with 12V from the original power supply and cut the inverter cable and soldered it to the apple inverter cable but that didn't work with the original inverter. Somehow the controller also only draws 0.6A both from the apple power supply and from an external 12v 3A power supply. i'm not that savvy in electronics, maybe you could power the inverter board separately with an external 12v power supply, just the 12V and GND cables but i don't want to fry anything. please share any successes here
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Can you give any information about the pins from original power supply that you have used to give power to the controller board? Thanks in advance
Guys any update on this project?
All of you should come and see and share some info about 2009/2010 models at: https://forums.macrumors.com/threads/dis...
Progress are being made, i think :-)
"
Take a penny. Leave a penny.
I managed to use the original apple inverter board for full brightness control together with the chinese control board.
In this scenario the chinese inverter which comes with the controll board is not used.
The pins are basically described on both boards.
From the China control board the ADJ goes to PWN and the BL_ON to the BL_ON of the Apple inverter. Furthermore, the 12 V pins and the GND pins are connected to the respective 12 V pins and the GND pins on the Apple inverter.
The brigthness can also be regulated via the menu of the Chinese Controller board. However, the adjustment bar in the menu is now strangely inverted. So that the maximum screen brightness corresponds to 0% at the adjustment bar of the brightness in the menu.
The maximum brightness should be a voltage of 3.25 V. I was also able to measure this with the multimeter.
Everything works for now. Let's see if it stays stable when the screen is on for several hours.
I have used a iMac 2010 with a LG LM270wq1 SDC2 Screen. I orderd the Control Board Version with Display Port and HDMI
| DP_HDMI Zu EDP Stick bord LM270WQ1-SDC2/LM270WQ1-SDA2/LM270WQ1-SDE3 Control board Kit für 2560X1440 LCD LED Screen
"
Some advancements are being made for the 2011 27" imac https://forums.macrumors.com/threads/dis...
the user SubDriver is making a great tutorial how to solve the brightness issue.
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I'm about to receive the controller board and want to use the original PSU+INVERTER too 😃 in the future I will use the camera, SD card reader, de drive, microphone, and off course the 4 USB ports with a 7 port USB 3.1 hub
Hi, is there any progress or final success on this project? I also got an old iMac and try to give some parts a second life. Right now I have the eBay Controller Board with Inverter running. Setup is working but with unsatisfying backlight and fading brightness from left to right. I would be happy if someone developed a final concept. Unfortunately I am to uneducated in electronics to trust myself getting it done alone. But would be happy to help in whatever way.
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I have the original Apple inverter from 2011, which doesn’t have the BLO pin but instead has the ENA pin.
I’ve connected the BLO pin from the Chinese board to the ENA pin of the original Apple inverter, but I can’t get the screen to turn on. Any advice on this?
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@jorgehormilla what is the voltage on this BLO pin?
2.32volts in BLO to ENA
지난 24시간: 1
지난 7일: 22
지난 30일: 81
전체 시간: 11,484
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@danj Ideas?
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Hello Aaron, thank you for the response, my iMac will not power on, I am looking for some guide that can point out the voltages for each pin the power supply, that way I can use my multi-meter and check if the power supply is the problem or not.
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