820-2879 LCD connector shorted now won't power up

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MacBook Pro 13" Unibody Early 2011

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

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Hi, I have an 820-2879 where the LCD connector locking arm shorted out the connector.

I have a green light on charger but no power up. I am trying to learn board repairs so thought a good one to start on.

PP3v42_G3H is at 3.48v but

I'm finding PPBus_G3h on the output of F7040 to be going from 12.8 - 2.8 pause then starts again at 12-8volts and goes down.

I am trying to learn so presume U7000 is what helps produces PPBus_g3h is that correct?

Q7030 has the same irregular voltage on pin 4.

Am I looking down the right line, can I have some help/advice please on where to go next?

Could it also maybe be something trying to turn on then can't hence why it goes back through the voltage cycle.

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2 Comments:

@mccltd this is of course after you changed the connector? Best person to let you know would be either @reecee or @tcrs_circuit

Resistance between pins 17/18 and 27/28 of U7000?

@mccltd this is of course after you changed the connector? Best person to let you know would be either @reecee or @tcrs_circuit — oldturkey03

Truckguy @thatonetruckguy Rep: 750 11 11 1 · Answer 1 · 2017-12-15T19:05:44-07:00

Rep: 750

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You could have shorted something out.

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