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24" display; Built-in iSight Camera, Microphone, and Speakers; 1920x1200 resolution. Released October 2008, identified by model number A1267.

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similar issue (image without backlight)

Hi, I have a very similar issue (image without backlight) but with a difference.

I checked the test points i n the logic board as per the manual, and there is something very interedting happening.

When I test them within 30 seconds from connecting the power to the plug, everything seems fine

After 30 seconds, the PSU fan seems to slow down, and the voltages change in the logic board:

DC in

TP11 =14.7 instead of 24.5

TP12= 0 instead of 24.5

TP13= 0 instead 12

LED backlight

TP81=0 instead of 25

TP82= 1.02 (OK)

TP61= 3.3 (OK)

I also check the voltage at the PSU (there is a cable in the board gettinh to the logic board with a 24v written on it)

Again, the first 30sec 24v , after drops (I dont remember how much)

Now, the interesting thing is, that when i connect the screem to my laptop, for the first less than a second ot flashes (i can see something) after that no backlight at all.

Im a bit confused, not sure what is wrong, and cannot spend money in changing everything. Im not sure if it is the psu, logic board or panel.

anyone help?

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1 solution

I would guess that if the display is not connected to the laptop video output the display shutsdown/ power save mode => switch off the LCD voltages => I havent checked the TP11 but I guess it goes to the LCD or LEDs.

if you read the issue:

What components need replacing on the Logic board?

You will find an an extensive description on the LED background not lighting. If you have any questions just ask and I ll see what I can find out but please read the thread carefully, I think you ll find your answer there.

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nodaus sera éternellement reconnaissant.
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