Hi everybody.
I have a problem with my MBP since around 6 weeks ago.
Basically, the LED backlight doesn't work at all, which is quite a pain. I closed the lid once and when I came back to work on it again the screen wouldn't lit up again.
This screen i have right now with this issue is the second one i have on this laptop. The original one got smashed last winter and broke the LCD, so I bought this one thru ebay and replaced it myself. It has been working without trouble until now.
So I started doing some research about what could be the cause of the problem, thinking it could be a faulty graphics card, as reported by apple, some of this NVIDIA GeForce 8600 were faulty, but my external display works fine, so it's not that.
Then, a few days ago, I decided to open the laptop to replace the LED strip that lights up the screen with the one of my old screen and realized how complicated it was, so I started doing several tests with the 2 screens and parts.
Basically, I've tried both screens with both cabling sets, independently and mixing cables from both screens, the 2 LED driver boards, etc... All possible combinations, but none of the LED backlights will light up; neither on my old screen nor the new one.
I would be really surprised if both LEDs are broken, or both LED driver boards are faulty, or all cables are wrong...
So I'm a bit lost right now. The only 2 things I can think of are either the sleep magnet is stuck, but i doubt that's the problem as I'm writing this from the actual laptop with a desk light at the back to be able to see, or something within the logic board and the mains distribution to the actual led board.
So the next thing I want to check is the mains circulation across the whole circuit until the actual LEDs, with a voltmeter, but I don't know what's each pin on each connector and cables to avoid any short circuits are and what figures should I expect on my measurements.
Can anyone help me on this?
Or do you think there might be another cause for this problem?
Thanks in advance.
I have a problem with my MBP since around 6 weeks ago.
Basically, the LED backlight doesn't work at all, which is quite a pain. I closed the lid once and when I came back to work on it again the screen wouldn't lit up again.
This screen i have right now with this issue is the second one i have on this laptop. The original one got smashed last winter and broke the LCD, so I bought this one thru ebay and replaced it myself. It has been working without trouble until now.
So I started doing some research about what could be the cause of the problem, thinking it could be a faulty graphics card, as reported by apple, some of this NVIDIA GeForce 8600 were faulty, but my external display works fine, so it's not that.
Then, a few days ago, I decided to open the laptop to replace the LED strip that lights up the screen with the one of my old screen and realized how complicated it was, so I started doing several tests with the 2 screens and parts.
Basically, I've tried both screens with both cabling sets, independently and mixing cables from both screens, the 2 LED driver boards, etc... All possible combinations, but none of the LED backlights will light up; neither on my old screen nor the new one.
I would be really surprised if both LEDs are broken, or both LED driver boards are faulty, or all cables are wrong...
So I'm a bit lost right now. The only 2 things I can think of are either the sleep magnet is stuck, but i doubt that's the problem as I'm writing this from the actual laptop with a desk light at the back to be able to see, or something within the logic board and the mains distribution to the actual led board.
So the next thing I want to check is the mains circulation across the whole circuit until the actual LEDs, with a voltmeter, but I don't know what's each pin on each connector and cables to avoid any short circuits are and what figures should I expect on my measurements.
Can anyone help me on this?
Or do you think there might be another cause for this problem?
Thanks in advance.