Chosen Solution
Hi Team, I’m hoping someone can help me with the issue with my thunderbolt display. Here is whats happening When I plug it in initially the screen will light up normally. Then after a period anytime from a few seconds to a couple of hours it will go black. things to note: -Everything plugged in to the display still works; webcam, usb ports, cooling fans etc. -I can see the monitor from the system report and the latest firmware is present (26.2) -I can see a faint outline of my desktop on my darkened screen if I hold a light up to it I have taken it to an apple repair shop and after a cursory look they identified the logic board to be at fault. they have quoted $350 to replace it. A bit too much to spend on an old screen. I have looked at reflowing the board in the oven or under a heat gun (hey what have I got to loose right?!) but there are lots of plastic parts and I think I might do more damage than good. Maybe someone might have a better idea? Please help
@alexreid a reflow probably will not work since you have images just not a backlight. I’d start by checking things like C1100 to see if you have 3.3V going to your backlight enable circuitry etc. (also possibly a backlight fuse) to see what the power situation is on that one. Post some good images of your board with your question so we can see what you see. Use this guide Adding images to an existing question for that. We might identify the components in question. Check things like step 12 of this teardown Apple Thunderbolt Display Teardown it shows your LED driver (HV9982) in the black square.
Surprisingly this is an easy fix for someone who has micro soldering skills and access to the SMT parts.
I’m not sure what else you can do, but this is a source for the part although it is currently out of stock. https://beetstech.com/product/thunderbol…
