Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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LCD backlight "stagelighting" & intermittent image garbling + whine

Hello all - any help very much appreciated. Have some ever-present "stagelight" or "spotlight" effect at the bottom of my screen, as seen in the first picture. Also, as seen in the second, the display at time locks at fades into garbled lines.

Block Image


Block Image


It works perfectly on external monitor, also the second image is intermittent, and moving the screen or applying pressure to the bezel helps resolve it.

In addition, at anything less than full brightness there's a quiet high-pitched [incredibly annoying!] "whine" that gets quieter as brightness is lowered.

Here's the relevant area on my logic board... looks ok: http://i.imgur.com/f5RRNoP.jpg

Block Image

This a problem with the LCD itself or just the LVDS cable possibly? Works perfectly when connected to an external monitor.

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Is this present on an external monitor?


nope works perfectly on the external monitor


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Chosen Solution

Far M, the stage lighting could be caused by issues with the LED returns. Check the resistors around your LVDS connector. Also check the LED driver. For that you will of course need the logic board schematic, the boardview files and a good multimeter. Looking at your images, it is also conceivable that you need a new display. Might be the best place to start off.

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Thanks - yeah, I guess we sort of have to proceed by process of elimination at this point, huh... how do I find the particular code I need to get the right schematic for my logic board? Will something like this tell me what I need to know? http://www.amazon.com/Etekcity-Digital-M...


Yes it will and if you look on your mother board you should see a 820-XXXX number. Use that to search for the schematic


Hey there! So finally got around to this. It's 820-2530-A. Think I've found the schematic but not a clue what to do with it!


Identify and check the resistors around your LVDS connector.


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Far M will be eternally grateful.
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