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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Having a LCD Backlight problem iMac 21.5" late 2013 820-3302-A

Hi techs

One of my costumers brought this iMac for repair, it was working fine while watching NetFlix and then, the screen went dark but voice still working.

I put the light on the LCD and I was able to see the apps, I plugged it to TV screen and it works just fine. Any help with that please?

Is there any fuse or a component for the backlight I need to check ( similar to the filter of iPad mayber ) ???

I've tested the outputs at the logic board feeding the flex cable which goes to the leds and found there's 0 volt on each!!!

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Update (02/24/2017)

Ahhhh!

Gotcha

It's FB9708

Many thanks for all

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Une réponse ! View the answer J'ai le même problème

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@iphix what is the 820-XXXX number on your Logic board?

par

oldturkey03

820-3302-A

Thank you

par

Hi dear,

Do you tell us what do you have done? Thanks.

par

Hi there

I have at problem that might be in the same kategory, the screen at my imac 2013 is flickering random, shutting of picture- turning it on after 1/2 second or so.

Turning down brightness(light) is reducing the problem dramaticly.

Sometimes, the screen stay of, an comes first on again when the maskine reboots og goes into st-by.

External screen has no problems, neigher when main screen is constant off.

Anyone have an idea ?

Greetings /Jesper

par

I`d test it with another new LCD this issue must be from LCD not from backlight circuit keep me up to date with your results please.

thank you

par

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Solution retenue

@iphix start by checking the backlight fuse F9700 for continuity. It is a 5A 32V fuse in a 0603 package. If you have conitinuity, then you do want to check it for 12V on either end of the fuse. Black to ground and Red to the contact on the fuse. You do of course need to power up the board.

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Update (02/24/2017)

Since you have power on the fuse, use the schematic to check the next components for power. test until you find the component that no longer shows power. Also, do not forget to check the backlight connector J9700

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Thank you

I have got 12.14v on both sides

par

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Justin sera éternellement reconnaissant.
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