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Modell A1311 / Mitte 2010 / 3,06 & 3,2 GHz Core i3 oder 3,6 GHz Core i5 Prozessor

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Display black screen but backlight works, replacement LCD also OK

I have read posts about iMac 21.5” A1311 black screens, and none of the posts describes the issue I am facing. My iMac is a EMC 2389, but the issues here could I think affect any A1311.

After replacing the hard disk in the iMac and putting the screen back on the iMac, the screen backlight works, but no image at all is shown. Even examining the screen with a torch shows no image. All 4 diagnostic LEDs are on.

So it’s a loose cable?

No. I have even replaced the LVDS cable, AND even borrowed the LCD panel from a friend’s iMac and that works just fine. External monitors work just fine as well.

This leads me to conclude that there is something faulty with the LCD panel itself - it is a LM215WF3 (SD)(B1). Is there some fuse in the panel that could have blown? Or any other way to diagnose a panel fault?

Please note my problem is not After HD changed, fuse (wall) tripped, no internal video, but external, or Why is screen black after replacing hard drive?, as using a replacement LCD panel is fine.

Any assistance would be most welcome!

EDIT

In light of Dan’s answer below, here are some pictures of the T-CON board. There is no obvious sign of any burnout. The darkening on the plastic above the main chip is I assume simply due to heat over the years?

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Hilfreichste Antwort

The display it’s self has a logic board which converts the LVDS signal to the rasterize signal the LCD needs to paint the image onto the screen (T-CON board), this is likely your issue. If you carefully remove th metal shielding where the LVDS cable enters you’ll find it. You might see a burnt component or cold solder joint which might be repairable. Otherwise you’ll need a new screen assembly.

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Hi Dan - thank you! I have added some pictures of the T-CON board to the original post. There is no obvious sign of burn out. Looks like I am going to need a new panel :-/

von

Yep, sounds like the best answer ;-{

von

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Jon Worth wird auf ewig dankbar sein.
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