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Current version by: HER Zygiel (Herzygiel) ,

Title:

LCD Backlight problem I mac27 late 2013

Text:

Hi All,
I have received the above imac for FREE : ) with the below issues and trying to figure out if it is worth to fix it. I hope you'll be able to help me out :)
Internal Dispaly is not working - external OK
Diagnostic LED's - 1,2,3 OK - 4 is off
Replaced LCD cable ( 2 pins were bent and sticked to each other )
I did a SMC/PVRAM Reset
A faint image is not visible ( checked in dark room and flashed the light on )
Run hardware test : may be an issue with System Management Controller PFM006 and with the display VFD001
The visual check showns blown part - as on the attached link( not shure if it has been caused by connecting a faulty cable and have not found logic board schematic to figure out what is it - fuse / capacitor etc....
Is there any way to test LCD panel it self ?
[image|1473466]
https://s33.postimg.cc/vk0hkmpvj/de29ee7d-b8aa-4d96-8db6-5d0e04ff25f7.jpg
Cheers
Pete
+
+=== Update (06/05/2018) ===
+
+The L4400 has now been replaced and the 4th LED is on !!! There is only a lot of stripes on my LCD unfortunetelly ....
+
+[image|1475969]
+
+What do you think guys ? is it dead display or something else ? - when I touch the LCD connector on the logic board the stripes are changing.......

Device:

iMac Intel 27" EMC 2639

Status:

open

Accepted Answer:

490396

Edit by: HER Zygiel (Herzygiel) ,

Title:

LCD Backlight problem I mac27 late 2013

Text:

Hi All,
I have received the above imac for FREE : ) with the below issues and trying to figure out if it is worth to fix it. I hope you'll be able to help me out :)
Internal Dispaly is not working - external OK
Diagnostic LED's - 1,2,3 OK - 4 is off
Replaced LCD cable ( 2 pins were bent and sticked to each other )
I did a SMC/PVRAM Reset
A faint image is not visible ( checked in dark room and flashed the light on )
Run hardware test : may be an issue with System Management Controller PFM006 and with the display VFD001
The visual check showns blown part - as on the attached link( not shure if it has been caused by connecting a faulty cable and have not found logic board schematic to figure out what is it - fuse / capacitor etc....
Is there any way to test LCD panel it self ?
-[image|1473466]https://s33.postimg.cc/vk0hkmpvj/de29ee7d-b8aa-4d96-8db6-5d0e04ff25f7.jpg
+[image|1473466]
+
+https://s33.postimg.cc/vk0hkmpvj/de29ee7d-b8aa-4d96-8db6-5d0e04ff25f7.jpg
Cheers
Pete

Device:

iMac Intel 27" EMC 2639

Status:

open

Accepted Answer:

+490396

Edit by: oldturkey03 ,

Title:

LCD Backlight problem I mac27 late 2013

Text:

Hi All,
I have received the above imac for FREE : ) with the below issues and trying to figure out if it is worth to fix it. I hope you'll be able to help me out :)
Internal Dispaly is not working - external OK
Diagnostic LED's - 1,2,3 OK - 4 is off
Replaced LCD cable ( 2 pins were bent and sticked to each other )
I did a SMC/PVRAM Reset
A faint image is not visible ( checked in dark room and flashed the light on )
Run hardware test : may be an issue with System Management Controller PFM006 and with the display VFD001
The visual check showns blown part - as on the attached link( not shure if it has been caused by connecting a faulty cable and have not found logic board schematic to figure out what is it - fuse / capacitor etc....
Is there any way to test LCD panel it self ?
-https://s33.postimg.cc/vk0hkmpvj/de29ee7d-b8aa-4d96-8db6-5d0e04ff25f7.jpg
+[image|1473466]https://s33.postimg.cc/vk0hkmpvj/de29ee7d-b8aa-4d96-8db6-5d0e04ff25f7.jpg
Cheers
Pete

Device:

iMac Intel 27" EMC 2639

Status:

open

Original post by: HER Zygiel (Herzygiel) ,

Title:

LCD Backlight problem I mac27 late 2013

Text:

Hi All,

I have received the above imac for FREE : ) with the below issues and trying to figure out if it is worth to fix it. I hope you'll be able to help me out :)

Internal Dispaly is not working - external OK

Diagnostic LED's - 1,2,3 OK -   4 is off

Replaced LCD cable ( 2 pins were bent and sticked to each other )

I did a SMC/PVRAM Reset

A faint image is not visible ( checked in dark room and flashed the light on )

Run hardware test : may be an issue with System Management Controller PFM006 and with the display VFD001

The visual check showns blown part  - as on the attached link( not shure if it has been caused by connecting a faulty cable and have not found logic board schematic to figure out what is it - fuse / capacitor etc....

Is there any way to test LCD panel it self ?

https://s33.postimg.cc/vk0hkmpvj/de29ee7d-b8aa-4d96-8db6-5d0e04ff25f7.jpg

Cheers

Pete

Device:

iMac Intel 27" EMC 2639

Status:

open