Hey guys, won't lie, still new to this stuff. I will be making good use of this forum since I have several Macs to fix and only so much time to watch LR vids.
I have an 820-2936-B with no image / video, but works perfectly on an external monitor. History: customer replaced their own screen. I've tested with a known-good, same result.
I did diode mode measurements at the connector pins, and only found that pin 5 is OL (with the screen plugged in).
Here's my measurements:
Also have no backlight, if that helps. Only damage I see is that the bottom left corner of U9000 is barely chipped.
Getting .2v on pin 1 @ R9014 (LCD_IG_PWR_EN). About the same at backlight enable.
Again, on an external monitor the computer works perfectly.
Thanks!
I have an 820-2936-B with no image / video, but works perfectly on an external monitor. History: customer replaced their own screen. I've tested with a known-good, same result.
I did diode mode measurements at the connector pins, and only found that pin 5 is OL (with the screen plugged in).
Here's my measurements:
j9000 | good | bad | difference |
1 | 0 | 0 | 0 |
2 | 535 | 541 | 6 |
3 | 535 | 541 | 6 |
4 | 322 | 317 | -5 |
5 | ol | ol | |
6 | 555 | 555 | 0 |
7 | 555 | 554 | -1 |
8 | 541 | 556 | 15 |
9 | 541 | 555 | 14 |
10 | 0 | 0 | 0 |
11 | 541 | 556 | 15 |
12 | 541 | 556 | 15 |
13 | 0 | 0 | 0 |
14 | 541 | 553 | 12 |
15 | 541 | 553 | 12 |
16 | 0 | 0 | 0 |
17 | 547 | 554 | 7 |
18 | 547 | 555 | 8 |
19 | 0 | 0 | 0 |
20 | ol | ol | |
21 | 551 | 549 | -2 |
22 | 551 | 549 | -2 |
23 | ol | ol | |
24 | 582 | 578 | -4 |
25 | 586 | 579 | -7 |
26 | 585 | 579 | -6 |
27 | 582 | 572 | -10 |
28 | 583 | 575 | -8 |
29 | 568 | 555 | -13 |
30 | ol | ol |
j9000 - lcd connected | good | bad | difference |
1 | 0 | 0 | 0 |
2 | 409 | 543 | 134 |
3 | 409 | 543 | 134 |
4 | 321 | 319 | -2 |
5 | 640 | ol | <---- this? |
6 | 505 | 557 | 52 |
7 | 507 | 556 | 49 |
8 | 523 | 514 | -9 |
9 | 523 | 340 | -183 |
10 | 0 | 0 | 0 |
11 | 523 | 340 | -183 |
12 | 523 | 340 | -183 |
13 | 0 | 0 | 0 |
14 | 521 | 340 | -181 |
15 | 521 | 341 | -180 |
16 | 0 | 0 | 0 |
17 | 530 | 340 | -190 |
18 | 530 | 340 | -190 |
19 | 0 | 0 | 0 |
20 | ol | ol | |
21 | 550 | 551 | 1 |
22 | 550 | 551 | 1 |
23 | ol | ol | |
24 | 580 | 594 | 14 |
25 | 585 | 593 | 8 |
26 | 584 | 594 | 10 |
27 | 580 | 590 | 10 |
28 | 582 | 590 | 8 |
29 | 566 | 590 | 24 |
30 | ol | ol |
Also have no backlight, if that helps. Only damage I see is that the bottom left corner of U9000 is barely chipped.
Getting .2v on pin 1 @ R9014 (LCD_IG_PWR_EN). About the same at backlight enable.
Again, on an external monitor the computer works perfectly.
Thanks!