macbook pro a1989 macbook started But no screen on extern or intern display.

[SaYHell0]

Hello i guess i have another logic board as the usual a1989?
Iam new into smd fixing but i want to learn That because that makes so much fun

I guess i Found my Problem?



Problem was: macbook started But no screen on extern or intern display.
Cpu/gpu was very Hot after trying a few commands with reboot

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

i could not find any brd file for my logic board...

after replacing the thermal paste of the cpu and gpu the macbook starts with full rpm of both fans...

Anyone any clues?

[SMDFlea]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Schematc & Boardview -> https://www.badcaps.net/forum/showthread.php?t=76497

.

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Edit: On Windows i can see everything
Thank you!

The "burned" part on my logic board is missing on the schematic... Could that be from the U5710?

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Where do you guys gets the parts?

[dellxps15]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Where do you guys gets the parts?

depends on what part u need. for resistor i got that sample book with the most common resistor and capacitor values.

for different unique type i get from donor board, or make order from digikey or mouser.

for ic and so on i go to aliexpress or china in general or digikey or mouser.

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

depends on what part u need. for resistor i got that sample book with the most common resistor and capacitor values.

for different unique type i get from donor board, or make order from digikey or mouser.

for ic and so on i go to aliexpress or china in general or digikey or mouser.

Thank you so much!

and special like that, how or where can i find that?:
or what is the name of that? how can i find the name?

[mon2]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Each logic board from Apple / Foxconn has a 820-**** part number etched onto the PCB itself. Using this as a guide, you may be able to locate the schematic on this forum.

For example, A1989 = 820-00850 and the schematic is posted here in post # 33:

https://www.badcaps.net/forum/showth...0-00850&page=2

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Thank you so much guys. I love to do that. But i rly cant find the "destroyed" parts to buy.
Do you have anywhere a guide to find the name of the parts? like transistor etc.

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Each logic board from Apple / Foxconn has a 820-**** part number etched onto the PCB itself. Using this as a guide, you may be able to locate the schematic on this forum.

For example, A1989 = 820-00850 and the schematic is posted here in post # 33:

https://www.badcaps.net/forum/showth...0-00850&page=2

if i got the part number in the schematic, where can i search for that to buy?

[mon2]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

The vendors / stores will vary.

For simple passive parts like resistors / capacitors - suggest Digikey or Mouser or Arrow Electronics. They are international firms.

For rare parts that are often on these logic boards by Apple / HP / Dell - suggest AliExpress.

Apple will often have parts custom made to their specs to make it more difficult for techs to repair these units but they magically appear in Asia on AliExpress.

[Stephen]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Donor Boards are your friend. Always keep them and never throw them out. You’ll come to a point where you need them. All sizes 13” 15” 16” keep them. We have over 200 in stock. Just repaired a dead board that had a bad diode that was blown, (clean board) had a failed u7000, resistor as well and blown cap. One board we had didn’t have all the parts but we had 3 boards left with all the parts and got the board repaired.

[SaYHell0]

Re: macbook pro a1989 macbook started But no screen on extern or intern display.

Thank you so much guys!
You have some agenda or something to see what the parts looks like? I mean how the resistor or something looks like?

What do you guys do, if your part is obvisouly burned but not on the schematic?
Macbook starts but doesnt show anything on screen with hdmi adapter either...