Replaced the cable. Now, the screen does not work. What could be?

The cable coming out of the back of my monitor Apple Thunderbolt Display is fraying. I decided that rather than risk a short at a certain point, I preemptively replace the cable. On iFixit teardown photos, I decided to replace the cable coming out of the back of the screen myself instead of paying almost $200 to get an Apple service provider to do that here in Bangkok. Bought the cable on AliExpress for $12. It replaced. And... no dice. Screen has not come.

My setup

[MacBook Air]-[Thunderbolt Display]-[drive Thunderbolt]-[Cinema Display]

with a key USB drive and Ethernet connected to the back of the Thunderbolt display

Already tried this

  • First impressions were that the cable was defective. But then I noticed Ethernet came the USB has been mounted, Thunderbolt was mounted drive and after a reboot, the movie screen come also. Obviously, the cable has been working very well.
  • Second thought was that I'd neglected to plug some cables that connect the LCD to the main logic board. I checked. Seemed fine.
  • Third was maybe the serial number of the cable was somehow connected to the main logic board. So I put the old cable. Still no screen.
  • Tried to connect the screen with a Thunderbolt external cable, everything worked as well but still no image on the screen.
  • Tried more than 30 seconds and 3 hours disconnected as a "reset" of the screen. No change.
  • Restarted my laptop. No change.
  • Thunderbolt Display well plugged the drive and then into the MacBook, so change the sequence of the devices. No change.
  • Information reports under "Thunderbolt" the entire chain of devices, but under "Graphics/displays" system displays only the internal screen and Cinema Display.
  • Using the newly purchased cable as a Thunderbolt external cable works fine too.

Question

Does anyone have suggestions on what to try next?

The logic card goes into a sort of locked mode when you replace the cable?

Is there more than 3 flat cables connection + connection to the land between the Panel and main Board?

Although there is no reason to think that this has been, how to test LCD screen still work given all these flat cable connectors?


Note: There is no Apple here store.  Apple authorized service providers are without help. He suggested to replace the cable and the Panel at a cost that is almost the same as the purchase of a new screen.

Some of the cables that connect the LCD to the main logic board, are very short. Careful lifting the LCD, because it will go away with strength cables once that raise you it more than 2 to 3 inches on the side of the camera module.

The shorter cable of all is the LVDS cable. A short cable with gold plated connector. Although I have had reconnected the cable on the side of the logic board, I had wrongly assumed that the other end of the cable was stayed connected because all the band used on. Someone with experience of fixing these things said of his town for this cable to unravel by force and to be sure to check both ends of the cable. When I peeled back the tape, I found that he had indeed been disconnected. Reconnect, fiddling with the tiny workspace to get the logical side of Board of Directors of what properly fixed cable again and we were back in business.

Apple authorized service providers here in Bangkok have quoted me $200 to replace the cable. I ordered the replacement cable Thunderbolt Display off AliExpress for $12.50. It was really simple to replace the cable, just to keep an eye on this darn LVDS cable opening to the top of the screen!

Tags: Peripherals

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