Ga door naar hoofdinhoud

Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

611 Vragen Bekijk alle

No Video on LCD

Hello, I have a A1224/EMC 2133 Core2 Duo 20" iMac that will not produce video on the LCD. I bought this system with a known no video issue with the intent to fix it. I am a computer repair tech with over 15 years of experience, just looking for some second opinions on how to proceed. When I originally purchased the system it would not produce video at all on LCD or external monitor, but the chime could be heard. I replaced the video card with a used x2600 card from eBay. the original card was a 2400XT. Now it outputs external video but no video on LCD. Below are the troubleshooting steps I have performed so far.

-System will produce video to an external monitor and boot to a setup disk

-Resetting PRAM had no effect

-There is no video on LCD at all. Using a flashlight, there is no ghosted image to indicate there is simply a backlight failure

-The backlight does not appear to be turning on

- Diagnostics LEDs 1,2 and 3 light up right away and stay lit up. LED 4 never comes on.

- Voltages on the power harness going into the LCD inverter are Pin1:3.3v, Pin2:0v, Pin3:-.03v, Pin4:12v. I may have the pins listed in the reverse order.

Beantwoord! View the answer Dit probleem heb ik ook

Is dit een goede vraag?

Score 0
Een opmerking toevoegen

2 Antwoorden

Gekozen oplossing

After replacing the LVDS cable the screen comes on with backlight.

Was dit antwoord nuttig?

Score 0
Een opmerking toevoegen
Het nuttigste antwoord

See if it's the inverter: iMac Intel 20" EMC 2133 and 2210 Inverter Replacement

Was dit antwoord nuttig?

Score 1


Would a faulty inverter cause an image to not be displayed on the LCD? Since the inverter only powers the CCFLs I would expect to still get an image on the LCD that could be seen with a flashlight.


Can you see a faint desktop. If so replace the inverter.


No, I see no image in the LCD. I also tried with a flashlight up to the screen, and no image is on the LCD at all.


Since I'm not getting any image on the LCD panel I decided to order an LVDS cable first. I figure my steps in order of importance are get an image on the LCD, then look into the backlight not lighting up.


Een opmerking toevoegen

Voeg je antwoord toe

Joe zal eeuwig dankbaar zijn.

Afgelopen 24 Uren: 0

Afgelopen 7 Dagen: 1

Afgelopen 30 Dagen: 2

Altijd: 258