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But with the same probes and on the same pin, i have 5V when no lcd is connected when the macbook is chiming.

Is there a reason why i have only 4.4V on Pins 28-30 when lcd is connected and working? At the same time i have 5V on L8300 on both pins.

5V without display, but it´s working now again. I put the wires back between C8326 <-> R8318 and C8326 <-> R8317 and now it´s working with only lcd and board. I put tonight everything together in the housing and will report. Thank you.

FL8303 pads are lost, so the last parts in this data lines are C8327 and C8326. I try to figure out why the backlight is not present anymore. After that i´ll solder the the wires back to bridge the FL8303. On J8300 i pin 28-30 i have 4.4V and on Pin 9 only 1.8V.

I already disconnected the wires which i soldered on the board to restore the state when backlight was working. I measured with connected LCD.

That was the main failure. I placed some tiny wires on it and it worked for when i tested it. Then i want to resolder the wires because i was not happy with it. Now i have no backlight. I measured on the C7715-C7717 and i have 0V on it. Edit: On F7700 i have my 12V Edit: On Q7706 Pin 1 - 0V...

I searched for the FL830x coils. And I think I found the problem. FL8303 is not there. Its cracked in the middle on both lines. Does anyone can give the part number of it to order or a comparable coil.

No success.

first, thanks for your fast reply. screen is completly black, apple logo is shining so backlight is on. capslock and usb activity working. i measure when i´m at home:)

Hello community, i read a lot of interesting threads the last days here and i decided to register myself and i hope someone can help me with a Macbook Pro 15" mid 2014. From one day to the other the macbook wont start. I unplugged the battery, ssd and pressed the power button for 15 seconds...