ComputerBooter
New member
Whats up everyone, love you guys over at Rossman Repair Group, I have been working up the courage to start offering logic repairs to my customers (own a small repair shop) and your videos and knowledge have helped me work up to the point where I am actually doing some repairs, and have actually been successful in repairing a few, imagine that!
Anyhow, it is great to be a part of this awesome community, and I can't wait to start helping people get their items fixed at a more affordable rate!
So here is what I got going on! (Please bear with me as I still feel slightly stoopid with schematics and understanding how the board actually works, but I learn quick ;-)
I've got a Macbook Pro 13" Retina 820-4924 a1502 board with no backlight.
The LCD connector was partially melted off so I have already replaced that, hoping that would be it, but of course not.
From what I can tell there is NO PP5V_S0, which I believe based on the schematics that is what goes into the LED Driver and powers the Backlight Enable?
The Q7700 is not enabling if it has 12v on the LCDBKLT_EN pin is that correct?
I am getting the 12v at the PPVIN_S0SW_LCDBKLT but it is not making it to r7742 which is the BKLT_EN Resistor. Hope I am doing ok on this.
I am not sure what to do, and the only other question I have is this, does this board need to be powered on with the keyboard or do I need to power it on with power pads in order for the backlight voltage to appear?? Because if so, I am not doing that, and only have the board plugged in alone without anything else while testing.
I have put the board back in the unit and it still displays an image, but still no backlight!
I really appreciate what everyone does here and I spent about 5 hours yesterday trying to figure this out on my own, with videos/brdview software. I just think I need a little more teaching before I can repair these in a respectable time limit, because I just cant spend this much time on a board haha..
Thanks for reading, and I eagerly await the knowledge!
David Rainer
Computer Booter
Anyhow, it is great to be a part of this awesome community, and I can't wait to start helping people get their items fixed at a more affordable rate!
So here is what I got going on! (Please bear with me as I still feel slightly stoopid with schematics and understanding how the board actually works, but I learn quick ;-)
I've got a Macbook Pro 13" Retina 820-4924 a1502 board with no backlight.
The LCD connector was partially melted off so I have already replaced that, hoping that would be it, but of course not.
From what I can tell there is NO PP5V_S0, which I believe based on the schematics that is what goes into the LED Driver and powers the Backlight Enable?
The Q7700 is not enabling if it has 12v on the LCDBKLT_EN pin is that correct?
I am getting the 12v at the PPVIN_S0SW_LCDBKLT but it is not making it to r7742 which is the BKLT_EN Resistor. Hope I am doing ok on this.
I am not sure what to do, and the only other question I have is this, does this board need to be powered on with the keyboard or do I need to power it on with power pads in order for the backlight voltage to appear?? Because if so, I am not doing that, and only have the board plugged in alone without anything else while testing.
I have put the board back in the unit and it still displays an image, but still no backlight!
I really appreciate what everyone does here and I spent about 5 hours yesterday trying to figure this out on my own, with videos/brdview software. I just think I need a little more teaching before I can repair these in a respectable time limit, because I just cant spend this much time on a board haha..
Thanks for reading, and I eagerly await the knowledge!
David Rainer
Computer Booter