How to open LED Cinema Display

Here are the following steps you will need. Let me know if there is anything else i can help with. The glass panel is held in place by magnets in the rear housing. So follow these steps:

Lay display on its back and press clean suction cups in opposite corners on glass panel. I strongly recommends wearing clean, lint-free gloves whenever handling the glass panel, to reduce cleaning required on reassembly.
Lift Glass panel straight up and off.
Remove suction cups and slide glass into protective microfoam bag
Remove 6 T10 screws: 3 on each side of the LCD panel.
Raise bottom edge of LCD a few inches using black mylar tabs.

Careful! There are 4 cables to disconnect.

From Left to right:

Cable 1. Ambient Temp Sensor
Cable 2. AIO Video
Cable 3. LCD Function Interface
Cable 4. LED Driver (Backlight)

Lift LCD panel straight up and off.

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Thanks Stev.... i'm able to open it but wat is the real cause as the is power on board but nothing is displaying..... wat do i need to change (parts)... and what cause it...

evans 의 2010년 6월 25일

Following Steven's test procedure, I was able to get to the point of diagnosing that the LED backlight is the apparent problem. Under bright light, I can see the images in the LCD panel, but no backlighting. Is there some sort of fuse or controller built into the actual panel that can be checked? Seems like if the LED backlighting went bad, there should be a way to check or replace just those parts.

dsnover 의 2010년 9월 9일

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Steven @steven89645 평판: 269 5 3 1 · Answer 2 · 2010-06-26T00:51:23-07:00

Steven @steven89645

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Eveans,

Disconnect power supply cable from logic board. Verify cable voltage at connector between Pin 1 and chassis ground (GND) is 14.3–15.8 VDC. No power or incorrect power to logic board. Most likely:Replace power supply. If the power checks out do the following steps..

Disconnect all connectors from the logic board EXCEPT the power supply cable. Verify voltages on logic board between test points TP61 (3.3VDC) and chassis ground (GND) is 3.1–3.5 VDC, and between TP13 (12VDC) and chassis ground (GND) is 11.4–12.6 VDC. IfPower supply OK.

Suspect possible short, damaged connector, or faulty sensor/ fan/speaker. Reconnect connectors one at a time and retest for 3.3VDC at TP61 and 12VDC at TP13. Replace affected part that causes the 3.3VDC or 12VDC voltages to disappear. If everything checks out ok, Replace logic board.

here is the link to go with the steps. It will have a pic of the logic board and spots to check.

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Jordo @jordo56930 평판: 828 4 1 · Answer 3 · 2010-06-22T10:04:13-07:00

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I think you need suction cups to pop off the glass as in the iMacs. mine had the same problem and i took it to a certified technician as it was under warranty. he fixed the flickering of the display by securely reattaching all (there are few) wires in the interior

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Anthony @anthony90831 평판: 13 1 · Answer 4 · 2010-08-23T15:57:59-07:00

Steven,

Thanks for your detailed info and picture responding to the ACD LED 24" question on the ifixit board.

I'm in a similar situation. I was given a 24" that wouldn't display anything. I'm able to plug the display in and get the speakers to work, charges macbook, camera works, USB works . . . but no image - blackness.

When I go into the display preferences it doesn't recognize the display. So . . . I followed your handy steps and took the beast apart for some testing. I was able to verify 14.7 VDC from the power supply.

Then I disconnected everything but the power connector to the Logic board and was able to verify all of the correct voltages (per your brilliant share of the photo/info). I reconnected everything one by one and still verified correct voltages. The only thing I didn't reconnect/check were the connections going to the LED display - "Cable1. Ambient Temp Sensor,Cable2. AIO Video,Cable3. LCD Function Interface,Cable4. LED Driver (Backlight)".

I reconnected LED just to double check if it was a loose connector - still no love.

If I'm reading your directions correctly - this would seem to indicate it's time to replace the logic board - yeah? Is there anyway to test the LED? Or should I just bite the bullet and order a new logic board?

Thanks so much for taking the time to post and respond. Any insight/tips would be greatly appreciated.

Best,

Anthony

did you ever sort this Antony? I have exactly the same issues and the same results from tests, I'm thinking bad led panel but it could also be the logic board did you have any joy?

Cheers,

Scott. — scottcorbettjoinery