I have the same issue on my 27 LED cinema display, it stays dark when reconnecting, sometimes i can reactivate it by switching power off and disconnect the video cable, than powering on and connecting it again. But this trick is working worse and worse over time. Today it didn’t work at all.
I already tried:
* checking cables, reseated them. No luck at all.
* replacing the power supply board. no difference.
* replacing the Logicboard. nothing.
* replacing the LED stripes (with supposed new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
-
*
'''UPDATE 1:'''
It turned out that the Backlight LED stripes I ordered from aliexpress were not new ones, but used ones! (I overlooked it when i bought them!) So I’ll finally try to resolder the outer connectors on my old ones (as suggested by John) and see if this brings light back into the dark. (I’ll post another update when done.)[br]
'''UPDATE 2 (FIXED!):'''
-
I finally resoldered the two connectors of the LED backlight stripes and put them back into the Panel… and what do you know… it seems to work perfect again. No Black screen, full brightness. I have to admit that changing the LED backlights of this panel is a nightmare. I didnt remove every Layer from front to back to get access because i wanted to avoid dust getting between the layers, so I layed the panel on its front and lifted the backplate (not completely!) to access the backlight. Be prepared, this will take some hours and lots of patience!
+
I finally resoldered the two connectors of the LED backlight stripes and put them back into the Panel… It seems to work perfect again. No Black screen, full brightness. I have to admit that changing the LED backlights of this panel is a nightmare. I didn’t remove every Layer from front to back to get access because I wanted to avoid dust getting between the layers, so I layed the panel on its front and lifted the backplate (not completely!) to access the backlight.
'''In conclusion:'''
-
The Problem in most cases is definitely the LED Backlight connectors. The solder seems to be corroding or something over the years which will result in a shutdown of the backlight driver. Also, if you consider buying some replacement backlight strips from aliexpress, be awere that most of them are USED, not new! You might end up with faulty ones (like I did).[br]
+
I guess the Problem in most cases are the LED Backlight connectors. The solder seems to be corroding or something over the years which eventually will result in a shutdown of the backlight driver. Also, if you consider buying some replacement backlight strips from aliexpress, be aware that most of them are used, not new! You might end up with faulty ones (like I did).[br]
I have the same issue on my 27 LED cinema display, it stays dark when reconnecting, sometimes i can reactivate it by switching power off and disconnect the video cable, than powering on and connecting it again. But this trick is working worse and worse over time. Today it didn’t work at all.
I already tried:
+
* checking cables, reseated them. No luck at all.
* replacing the power supply board. no difference.
-
* replacing the LED stripes (with new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
-
* i checked cables, reseated them. No luck at all.
+
* replacing the Logicboard. nothing.
+
* replacing the LED stripes (with supposed new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
+
*
'''UPDATE 1:'''
It turned out that the Backlight LED stripes I ordered from aliexpress were not new ones, but used ones! (I overlooked it when i bought them!) So I’ll finally try to resolder the outer connectors on my old ones (as suggested by John) and see if this brings light back into the dark. (I’ll post another update when done.)[br]
'''UPDATE 2 (FIXED!):'''
I finally resoldered the two connectors of the LED backlight stripes and put them back into the Panel… and what do you know… it seems to work perfect again. No Black screen, full brightness. I have to admit that changing the LED backlights of this panel is a nightmare. I didnt remove every Layer from front to back to get access because i wanted to avoid dust getting between the layers, so I layed the panel on its front and lifted the backplate (not completely!) to access the backlight. Be prepared, this will take some hours and lots of patience!
-
-
'''In conclusion:'''
The Problem in most cases is definitely the LED Backlight connectors. The solder seems to be corroding or something over the years which will result in a shutdown of the backlight driver. Also, if you consider buying some replacement backlight strips from aliexpress, be awere that most of them are USED, not new! You might end up with faulty ones (like I did).[br]
I have the same issue on my 27 LED cinema display, it stays dark when reconnecting, sometimes i can reactivate it by switching power off and disconnect the video cable, than powering on and connecting it again. But this trick is working worse and worse over time. Today it didn’t work at all.
I already tried:
* replacing the power supply board. no difference.
* replacing the LED stripes (with new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
* i checked cables, reseated them. No luck at all.
'''UPDATE 1:'''
-
It turned out that the Backlight LED stripes I ordered from aliexpress were not new ones, but used ones! (I overlooked it when i bought them!) So I’ll finally try to resolder the outer connectors on my old ones (as suggested by John) and see if this brings light back into the dark. (I’ll post another update when done.)
+
It turned out that the Backlight LED stripes I ordered from aliexpress were not new ones, but used ones! (I overlooked it when i bought them!) So I’ll finally try to resolder the outer connectors on my old ones (as suggested by John) and see if this brings light back into the dark. (I’ll post another update when done.)[br]
-
[br]
+
'''UPDATE 2 (FIXED!):'''
I finally resoldered the two connectors of the LED backlight stripes and put them back into the Panel… and what do you know… it seems to work perfect again. No Black screen, full brightness. I have to admit that changing the LED backlights of this panel is a nightmare. I didnt remove every Layer from front to back to get access because i wanted to avoid dust getting between the layers, so I layed the panel on its front and lifted the backplate (not completely!) to access the backlight. Be prepared, this will take some hours and lots of patience!
-
[br]
+
+
+
'''In conclusion:'''
+
+
The Problem in most cases is definitely the LED Backlight connectors. The solder seems to be corroding or something over the years which will result in a shutdown of the backlight driver. Also, if you consider buying some replacement backlight strips from aliexpress, be awere that most of them are USED, not new! You might end up with faulty ones (like I did).[br]
I have the same issue on my 27 LED cinema display, it stays dark when reconnecting, sometimes i can reactivate it by switching power off and disconnect the video cable, than powering on and connecting it again. But this trick is working worse and worse over time. Today it didn’t work at all.
I already tried:
* replacing the power supply board. no difference.
* replacing the LED stripes (with new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
* i checked cables, reseated them. No luck at all.
-
-
'''UPDATE 1:'''
It turned out that the Backlight LED stripes I ordered from aliexpress were not new ones, but used ones! (I overlooked it when i bought them!) So I’ll finally try to resolder the outer connectors on my old ones (as suggested by John) and see if this brings light back into the dark. (I’ll post another update when done.)
+
+
[br]
+
'''UPDATE 2 (FIXED!):'''
+
+
I finally resoldered the two connectors of the LED backlight stripes and put them back into the Panel… and what do you know… it seems to work perfect again. No Black screen, full brightness. I have to admit that changing the LED backlights of this panel is a nightmare. I didnt remove every Layer from front to back to get access because i wanted to avoid dust getting between the layers, so I layed the panel on its front and lifted the backplate (not completely!) to access the backlight. Be prepared, this will take some hours and lots of patience!
I have the same issue on my 27 LED cinema display, it stays dark when reconnecting, sometimes i can reactivate it by switching power off and disconnect the video cable, than powering on and connecting it again. But this trick is working worse and worse over time. Today it didn’t work at all.
I already tried:
* replacing the power supply board. no difference.
* replacing the LED stripes (with new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
* i checked cables, reseated them. No luck at all.
+
+
+
'''UPDATE 1:'''
+
+
It turned out that the Backlight LED stripes I ordered from aliexpress were not new ones, but used ones! (I overlooked it when i bought them!) So I’ll finally try to resolder the outer connectors on my old ones (as suggested by John) and see if this brings light back into the dark. (I’ll post another update when done.)
I have the same issue on my 27 LED cinema display, it stays dark when reconnecting, sometimes i can reactivate it by switching power off and disconnect the video cable, than powering on and connecting it again. But this trick is working worse and worse over time. Today it didn’t work at all.
I already tried:
* replacing the power supply board. no difference.
* replacing the LED stripes (with new ones). This operation was NO FUN at all. And it didn´t help, too. (See UPDATE 1)
* i checked cables, reseated them. No luck at all.