Hello everyone.
My own macbook pro from 2012 just decided it had enough. There is no image on the screen (screen dead, no backlight, no image whatsoever even with a torch behind the apple logo), there is no image on external via thunderbolt/DP adapter.
There is chime though, there is also all the controls from the keyboard, so it is possible to control the backlighting of the keys.
I had problems for the past year or two with the display, showing a green line (single pixel) or two, maybe three. But nothing that I took seriously as I had always used an external display.
The computer is mine since new, I got it with the optional "hires" matte screen.
Never seen water, always took good care of. A few scratches on the case, no dents, no serious damage.
So as I was probing the motherboard for voltages it happened that the display got turned up, showing the logo and I got the folder icon (because I removed the SSD), tried to turn off and on a few times, the display lit up like new most of times, the fourth time then it went dead again.
So the board is not to throw away yet.
I checked the LVDS connector and i got on the following pins:
1 - GND
2+3 - PP3v3_SW_LCD - 0volt (expected 3.3volt)
4 - PP3v3_S0 - 3.3volt
5 - NC
6 - LVDS_DDC_CLK - 3.3volt
7 - LVDS_DDC_DATA - 3.3volt
8+9 - LVDS_CON_A_DATA - 0.3volt
...
21 - LVDS_CON_B_DATA - 0.3volt
...
31 to 36 - LED_RET - 0volt (expected 0.5volt)
...
38 to 40 - PPVOut_S0_LCDBKLT - 0v
I also checked on the U9000 and got this on the following pins:
1 - 0volt (expected 3.3volt)
2+3 - 3.3volt
4+5 - 0volt (expected 3.3volt)
6+7 - GND
What should I check next? Can you give me any hint? I really don't want to give up on this machine, it served me well and I am sure it could serve me for at least for another two or three years.
Thanks in advance...
Martin
My own macbook pro from 2012 just decided it had enough. There is no image on the screen (screen dead, no backlight, no image whatsoever even with a torch behind the apple logo), there is no image on external via thunderbolt/DP adapter.
There is chime though, there is also all the controls from the keyboard, so it is possible to control the backlighting of the keys.
I had problems for the past year or two with the display, showing a green line (single pixel) or two, maybe three. But nothing that I took seriously as I had always used an external display.
The computer is mine since new, I got it with the optional "hires" matte screen.
Never seen water, always took good care of. A few scratches on the case, no dents, no serious damage.
So as I was probing the motherboard for voltages it happened that the display got turned up, showing the logo and I got the folder icon (because I removed the SSD), tried to turn off and on a few times, the display lit up like new most of times, the fourth time then it went dead again.
So the board is not to throw away yet.
I checked the LVDS connector and i got on the following pins:
1 - GND
2+3 - PP3v3_SW_LCD - 0volt (expected 3.3volt)
4 - PP3v3_S0 - 3.3volt
5 - NC
6 - LVDS_DDC_CLK - 3.3volt
7 - LVDS_DDC_DATA - 3.3volt
8+9 - LVDS_CON_A_DATA - 0.3volt
...
21 - LVDS_CON_B_DATA - 0.3volt
...
31 to 36 - LED_RET - 0volt (expected 0.5volt)
...
38 to 40 - PPVOut_S0_LCDBKLT - 0v
I also checked on the U9000 and got this on the following pins:
1 - 0volt (expected 3.3volt)
2+3 - 3.3volt
4+5 - 0volt (expected 3.3volt)
6+7 - GND
What should I check next? Can you give me any hint? I really don't want to give up on this machine, it served me well and I am sure it could serve me for at least for another two or three years.
Thanks in advance...
Martin
Comment