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MBA A1466 820-00165 no green light, no boot

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  • #31
    I can buy these diodes here in Canada, and get them faster than from China of course. Would a 1W diode be appropriate in this application? http://vi.raptor.ebaydesc.com/ws/eBa...=1552801163871

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    • #32
      D7012 has a very low current for its zener voltage
      Bigger diodes could require higher current to enter in zener zone.
      Check datasheet specifications of the one you want to buy.
      0.25-0.5W will work for sure; probably 1W too, just try.

      You can short D7012 to ground and use fake charger, it should work...

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      • #33
        OK so have to admit defeat. I gave up on the board and the zener diodes, just purchased another logic board and just installed it. Still no light on the charger, no boot. Could it be the DC in board which is causing my problem? I also disconnected the keyboard when trying to boot, in order to make sure that no short in the keyboard would interfere. But nada.
        Last edited by jurgenkoppen; 04-10-2019, 10:31 PM.

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        • #34
          Nevermind, she did boot up after all with my new logic board. Appears that the battery is fried and the machine will shut down immediately when I plug it in. The LCD screen was shaky, but stabilized and now is going without flicker....I am getting a new battery and call is a day.

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          • #35
            Just buy a fake charger for the original board.
            It should then work with a simple short instead of D7012.

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            • #36
              OK, I did throw the towel on the old logic board we discussed above, and bought a working one on Ebay. I know it is cheating, but wtf, I am a newbie and got tired of messing with it. Put in the new logic board,: it booted up fine for about 10 min, until I removed some fingerprints smudges on the LCD screen, upon which I lost my backlight. So I did the reseating of the connector, checked the fuse ,which is fine, and then assumed that the screen (which was the original screen in a water damaged machine), might have been compromised when it shorted, and bought another screen. But alas, I still have no backlight. The machine boots, runs well on an external monitor. Now if I could please have some help on finding what else might be the issue...So now I have a new used logic board, a new used screen, and a brand new battery...
              Last edited by jurgenkoppen; 06-25-2019, 04:42 PM. Reason: grammer

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              • #37
                Do you get image on internal screen, only missing backlight?
                The forum is full with information about backlight issues, especially for 00165 boards...

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                • #38
                  Yes, I do have the image, only it is very dark. I can run an external screen, so the machine is fine otherwise.
                  I looked at some of the forum backlight info, and did some measurements. I have nothing on PPVIN_S0SW_LCDBKLT, 0V. So it must be what generates PPVIN_S0SW_LCDBKLT. I 'll keep digging...

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                  • #39
                    OK, I tested Q7706 which has voltage only on p2 ands p5, 3.3V each. Then I looked at C7782 which was corroded enough to nearly fall off....

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                    • #40
                      And now, for something completely different: After I removed C7782, the LCD now is operational.....wtff?

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                      • #41
                        How does the Master Louis say it: Baddabing! Rebooted a few times, seems stabil!!

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