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1.83 GHz Core Duo or 1.83, 2, or 2.16 GHz Core 2 Duo A1208 (EMC 2104/2110/2114/2124)

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Anyone know what the power supply output voltages should be?

The first LED lights up, the second seems a little dim; (both fans start slowly,) the third never lights, (with display & inverter cables plugged back in.)

Of the five wires from the power supply to what I think is the inverter board? brn, blk, blk, brn, brn, only the last two browns show 5.0 Vdc, nothing on the rest. Anyone know if there should be 12V maybe on that first brown wire? Don't most computers need both 12V & 5V?

Checked PS caps carefully, no obvious signs of overheating or leakage.

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dentoni, what are the last four digits of your computers serial number? this will help us to properly identify your computer and its hardware.

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Hi, oldturkey03;

It's a 17" intel 2.0 Ghz iMac, last four s/n digits are: YVUX. The EMC No. is 2114.

The main power light comes on, fans run slowly, and first LED is brighter than the second one.

No start-up chime, and no sound or video.

I'm pretty sure it's the power supply, (but may be an inverter board? or this ambient light sensor? or something else I don't know about, and troubleshooting guides for this thing seem to be like hen's teeth...

Thanks for any help.

~Den

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2.0 GHz Core 2 Duo (T7200)

Intro Date: September 6, 2006 Disc Date: August 7, 2007

Order No: MA590LL Model No: A1208 (EMC 2114)

Subfamily: Late 2006 Model ID: iMac5,1

Std RAM: 1 GB Std VRAM: 128 MB

Std Storage: 160 GB (7200 RPM) Std Optical: 8X DL "SuperDrive"

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Android 维修工具包

一个新的屏幕或电池就在一个套件之内。

现在开始购物

Android 维修工具包

一个新的屏幕或电池就在一个套件之内。

现在开始购物

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dentoni, startw ith this from the service manual:"

LED #1

• Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power source is disconnected or the power supply is faulty.

LED #2

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

LED #3

• Indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.

Front LED

• Indicates that the computer has power but no video signal (e.g., the computer is starting up or the display has entered Sleep mode, turning off the video signal). This LED will pulse when the entire system has entered Energy Saver mode.

The iMac (17-inch Late 2006) will not turn on. The display remains black and there are no sounds from the fans or drives.

1. Verify the power outlet is good. Plug a different device into the socket to ensure there is power, or plug the iMac into another outlet. Does the iMac power on now?

Yes: Resolved. Bad outlet.

No: Go on to the next step.

2. Check the power cord. Use a known good power cord. Does the iMac power on now?

Yes: Your power cord has failed. Replace the AC power cord.

No: Go on to the next step.

3. Check the connection of the power cord on both ends. Verify that the power cord is securely plugged into both the AC outlet and back of the computer. Does the iMac power on now?

Yes: You may have a loose fit to your power cord. Replace the AC power cord and test.

No: Go on to the next step.

4. Follow instructions in the General Information chapter to reset the SMC. Does the iMac power on now?

Yes: Issue resolved.

No: Go on to the next step.

5. Remove and reinstall the SO-DIMM memory modules, located in the bottom of the computer. Does the iMac power on now?

Yes: Issue resolved.

No: Go on to the next step.

6. Remove the RAM access door, front bezel, and lower EMI shield to gain access to the three diagnostic LEDs. See “Diagnostic LEDs” in the General Information chapter for complete instructions on this procedure.

7. Plug the power cord into the iMac and the power cord into the AC outlet. Check to see if LED

#1 is On or Off.

LED #1 is On: This indicates that the power supply is getting good power from the AC outlet.

Go on to the next step.

LED #1 is Off: This indicates that either the power inlet assembly or the power supply should be replaced.

8 Press the power button. Check to see if LED # 2 comes On, comes on momentarily, or stays Off.

LED # 2 is On: The Power Supply is functioning. Go on to the next step.

LED # 2 comes on momentarily or stays Off: Replace the Power Supply.

9. At this point in the Power On process, you should hear a boot chime and see the front LED on the computer light up. When the main logic board and LCD panel communicate to deliver video, the front LED should go off, and LED # 3 should be on. Does the Front LED go off?

Yes: The LCD and main logic board have communicated. If there is no picture on the display,

follow “No Video” troubleshooting.

No: Your logic board is not communicating with LCD panel. Go on to the next step.

10. Check to see if LED # 3 is On or Off.

LED # 3 is On: The logic board is communicating with LCD panel. Follow “No Video” troubleshooting.

LED # 3 is Off: The logic board is not communicating with LCD panel. Reseat the LVDS cable and test again. If the issue persists, replace the main logic board." Hope this helps, good luck.

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