Repareer je spullen Gemeenschap Winkel

Early 2011 Model: A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor

782 Vragen Bekijk alle

Opties

Backlight failed, only shows with hard light please help :)

Hi guys I have,

Macbook pro 2011 late 13" laptop.

I can only see the screen with hard light from the back of the screen.

Tried resetting pram SMC, deleting PLIST login file, still no joy.

Im thinking of changing the Backlight fuse & WLED driver.

Where are they located on the 820-2936 B motherboard ?

There also seems to be a little bit of burning on the LVCDS connector ?

Have a look at my pictures theres a crack on a chip and I dont know if it will be causing a short as I dont know which component it is.

Any help is appreciated. I have SMD re work station and know a fair level of electronics.

Block Image

Block Image

Block Image

Update (03/13/2017)

Block Image

I have this for the logic board now so will be easier to locate chips etc.

Update (03/14/2017)

Block Image

updated multi meter resistance reading.

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

Is dit een goede vraag?

Ja Nee
Score 1
Voeg een opmerking toe

4 Antwoorden

Filteren op:
Meest nuttige Nieuwste Oudste
Gekozen oplossing

Opties

Firstly, don't change stuff without taking readings beforehand, you will likely just be wasting your time.

Measure the side of the capacitor I have pointed to in your picture, and tell me the voltage. If you are not getting a voltage at all, check for a short to ground. This is for the backlight voltage. The LCD connector looks slightly melted above this capacitor (might just be the picture), check the cable to make sure the pins are not bent, and there is no missing plastic. Shine a light inside the LCD connector too, if it looks a bit melted/burnt, the connector is shorted and will need to be replaced.

The chip with the cracked casing nearly always cracks, it is for ethernet and will be fine. Let me know how this goes.

Block Image

Was dit antwoord nuttig?

Ja Nee
Score 4

17 opmerkingen:

Ive measured the resisitor you pointed out mate. My multimeter is fairly old and is giving ( .609v with red probe to ground & black probe touching the left side of resistor ) Working on diode mode auto range. Right side of that resistor give beep.

Looked inside the LVDS it visually looks ok.

door

I did this with no power to board.

door

You need to measure the side pointed out in the picture with voltage running through it. If it has .6V with voltage running through (and the screen plugged in), check for a short on this side. The right side will beep since it is ground.

door

Will this be a safe voltage with charger connected to MagSafe while taking readings off board ?

door

Yes, as long as you are not measuring continuity across one component, or short different components together. You need to run voltage through it to measure the voltage

door

12 commentaren meer tonen

Voeg een opmerking toe

Opties

If you are talking about the big chip directly below the lvds connector, that is something for ethernet. Test the fuse for continuity and if it gives the correct voltage on one line but not the other.

Was dit antwoord nuttig?

Ja Nee
Score 2
Voeg een opmerking toe

Opties

Here is a video we did for reworking the LCD circuit, this is a MacBook Air but it will give you an idea of what your looking at.

Was dit antwoord nuttig?

Ja Nee
Score 1

1 Opmerking:

@kaykay another 500. A real asset to the site ;-)

door

Voeg een opmerking toe

Opties

I'm not sure about the connector, but the "burning" you are talking about looks like water damage/corrosion.

Try getting rubbing alcohol pads or just plain alcohol and rubbing it on the motherboard. If that doesn't work, sorry Hope that helps!

Was dit antwoord nuttig?

Ja Nee
Score 0

3 opmerkingen:

Where? all i see is some flux and isoproyl residue.

door

On the area where corrosion/water damage/burning is present. It may take some effort, but if it is corrosion, it should come off.

door

Actually, on second thought, Reece has a pretty good answer for you. Sorry I couldn't help o much.

door

Voeg een opmerking toe

Voeg je antwoord toe

Nathan Pelling zal eeuwig dankbaar zijn.
Weergavestatistieken:

Afgelopen 24 uren: 0

Afgelopen 7 dagen: 0

Afgelopen 30 dagen: 1

Altijd: 384