Hi Mac Support
Here i have updated my problem with a solution A or B.. What do you thing we should do and how much would it cost you to do this fix?
I have made a detailed guide make things easier.
I looking for a price around 100-400chf since a complete new board is 650$ it does not make sense to spend more and i just don’t have more tos pend at the moment. You can get complete 27"late09imacs for 850$ on ricardo & ebay (https://www.ricardo.ch/kaufen/computer-und-netzwerk/apple/imac/imac-27-late-2009/v/an757843516/), so just not make sense to do a super pricy fix.
My ,iMacLate09 i7cpu, Serial is : W80153335RU
SOLUTION A
Need to fix/replace a burned internal cable monitor port as shown on this image:
(The whole board works and i have a powerfull computer that runs via an external monitor, it’s only the internal monitor signal that is dead.
A new board costs 650$ so please to not do this if you are not confident you can do it without killing the entire board = i will have no functioning computer. Please only influence the monitor part of the board, since i assume damaging other parts of the board can be harder to fix and make the computer unusable)
Fixing videos from very experienced experts on youtube about this specific board fix show on a back air, this should be very similar to how you would do on an imac port:
Video is listed in priority of that quality of the information. Number 1 is best 3 is less directly related to this particular problem.
#1
Macbook Air logic board. Detailed Description of monitor port replacement that has been burned:
0.23 (burned parts and what looks healthy)
5.20 ( lpi 55 based board board volt eerything between 0.519 0.546 is usually what you are looking for)
11.10 (single pin connection method some people use)
14.50 (you can’t get solder in there, 15.15 i cannot stress that enough)
16.00 ( see what good flux does, and good tools. 16.18 don’t use kingbalt bullshit)
17.00 (don’t forget how it is to be new at something)
17.38 (pushing really hard to push to the board, nothing between the pin and the pad)
18.25 (tjekking pins moving or not, 1,2,3,4,5,6,7,…..,30)
19.01 even when looking connected it might not be connected.
20.20 explaining where connections go.
21.10 adding small wires
21.34 “random talk about dinner with his friend"
22.55 connecting the wire
25.30 illustrating that the display now works perfectly.
#2
Macbook logic board explaining the board architecture:
5.09 (port goes to controller chip that supplies power to the screen)
#3
2.12 (checking volt output since everything is useless with a dead link)
SOLUTION B
Maybe cheaper alternative solution connect to functioning external port:
Other option would be to add the internal screen to the functioning external display port, might be a cheaper solution even though we have to drill some holes in chassis and get a converter cable, that turn
For more details on my problem see my forum threat on ifixit.com (https://www.ifixit.com/Answers/View/258548/Black+screen+after+SSD+install+%28suspect+is+monitor+cables%29), the damage was after not connecting cable right after adding a new ssd drive to the iMac.