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Hello, I have a motherboard 820-00165 where I have the keyboard and mouse that no longer work on Mac OS X. What's odd though is that the keyboard works fine when booting, I can do an Alt + Cmd + P + R or a Cmd + D or Cmd + R without worries. So I suddenly made several PRAM reset but nothing. In...

If I understand correctly, I have to put the multimeter in diode mode, the red (+) on the mass, and with the black (-) I test each point of U7701? I should have what value if good / bad solder on the multimeter?

I have tested all U7701 pins to earth, except the GND pins, no other is grounded, no resistance to the multimeter (infinite resistance). I also took the opportunity to note all the tensions of U7701 with a monitor plug: 1: GND 2: GND 3: 2.5V 4: 2.81V 5: 8.54V 6: 8.55V 7: 8.55V 8: 0V 9: 0V 10...

Hello, yes the pin 2 is GND. I tested the pins of U7701, no worries, I tested the continuity, see if there were no tracks cut, I did not test the continuity to the ground for all the pins. I sold a new brand new chip bought on Farnell. Still no backlight. I still have 8.5V on XW7720.

On R7731, I have 8.5V on pin 1 and 2.5V on pin 2. On R7715, I have 2.5V on pin 1, but nothing on pin 2.

On BKL_EN I have 2.5 / 2.6V. On BKL_PWM I have 2.8V. Yes, I reset the PRAM several times.

The screen works, it does not worry when I test with other motherboards.

Good evening, I retest and in the end I have 8.5V well on XW7720, I had trouble testing or a bug. But still no backlight.

When all assembled, the same, I have an image but no backlight. I only have 8.5V in the backlight circuit. I have nothing on XW7720, but I have 8.5V on D7701.

On R7715 I have 2.5V. C7704, 2.80V. I have continuity between A5 U7701 and D7701. I also realized that I have nothing, 0V, on XW7720, but I have 8.5V on the components around. I have rechanged U7701.

Hello, I bought a dozen Q7706 and Q7707, so I'll have in stock. Now with a new Q7707, I have 8.5V at XW7720 instead of 0V. Have advance.

Q7706: I have 8.5V on pin 4, so I get the power of F7700. I have 8.3V on pin 3. And I have nothing, 0V, on others. Q7707: I have 2.45V on 6 and 4 out of 5 I have 3.29V. On 3 I have 5,12V, 2 I have 3.29V and on 1 (GND) I have 0V. For BKL_EN and BKL_PWM I have 0V. Sometimes I get to have a voltage...

Yes, I have an image. I just miss the backlight.

Good evening, I saw that it was actually a pad. It is present on the motherboard, and it is not oxidized. I tested with a functional motherboard and connected screen, I must have 25V at this place. But on the motherboard with HS backlight, I have nothing in this place, and even the surrounding...

Yes, I saw the XW7720 on the diagram (thanks for that). But on the motherboard, between the coil and the diode, I have nothing. I saw after that I could test it differently by measuring on the capacitors, I would do that. Motherboard : 820-00165-A.

Thanks for the reference of the components. I just need it because they miss me for a motherboard. I have a client who passes my 5 motherboards 820-00165, I have already repaired 3 (including one where I miss the Q7707). One HS (the BCM15700A2 chip overheating and the motherboard that starts...

Good evening, I need these 2 small IC (see photo) for a motherboard MacBook Air 13 "A1466 820-00165. It's 2 small ICs (mosfets normally) are for backlighting. I do not know where to order them. I also have another 820-00165 that starts, but no backlight. The 2 IC are OK, the chip on the back of...