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  1. R

    820-2850. Video problem after short on PPBus

    Hi. This board had a short on PPBUS from Q7530. I have replaced it and computer now turns on but with this little problem. https://goo.gl/photos/Zqmf2aU3hzkwQ3C7A Thanks. Have a good one.
  2. R

    [SOLVED]820-2850 no backlight

    Hi,Thanks. 2.8V both ways.Also, I lose BKLT_EN when its not working. (no pressure applied)
  3. R

    [SOLVED]820-2850 no backlight

    I have 3.2 V on both 2 and 5 of Q9807. I have found that it wasn't me taking measurements on Q9807 that was causing the backlight circuit to activate, but from the pressure of the probes. So what is happening is when ever I flex the board from any point from CPU area left to the backlight area...
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    [SOLVED]820-2850 no backlight

    Hi. Board has an Image but no Backlight. This board started as an lcd connector replacement to regain backlight because when old connector was tapped the backlight would go in and out. Tried known good working LCD. So I changed the connector and it seemed to work fine for a bit. Then backlight...
  5. R

    820-2850 Yellowish Whites

    I haven't. Reason is, I have swapped three different LCD's in the total time working with this board. All known working. One of the three is a "matte" finish LCD which seems to be working fine with it. All colors are normal. I have retested the other two "glossy" with different working boards to...
  6. R

    820-2850 Yellowish Whites

    no change when pushing/tapping on U9600.
  7. R

    820-2850 Yellowish Whites

    pn6 .478 pn7 .478 pn8 .593 pn9 .593 pn10 0 pn11 .593 pn12 .593 pn13 0 pn14 .593 pn15 .593 pn16 0 pn17 .593 pn18 .593 pn19 0 pn20 .593 pn21 .593 pn22 0 pn23 .593 pn24 .593 pn25 0 pn26 .593 pn27 .593 pn28 0 pn29 .593 pn30 .593 Thanks
  8. R

    820-2850 Yellowish Whites

    Tried known working display assemblies. Is this GPU or ??? Thank you. https://photos.app.goo.gl/Ou7kBYFEadwOaW3v1
  9. R

    820-2850 No PPBUS_G3H

    This is the charger I use https://photos.app.goo.gl/v9veklOqdGKpoAZV2 . Maybe its messed up. Thanks Duke and everyone for the help. Take care.
  10. R

    820-2850 No PPBUS_G3H

    Hey Duke... SMC_Reset goes from 3.4 V to 0 then back to 3.4 V when I press the power button. Checked around U5703, where pin 5 was actually missing! I did replaced it, and SMC_RESET now holds steady 3.4 V when pressing power. Only thing is now the WHORE wont turn on... LOL... PPBUS is 11.94 with...
  11. R

    820-2850 No PPBUS_G3H

    Light on charger still does that. Although, fans didnt twitch this time. Thanks.
  12. R

    820-2850 No PPBUS_G3H

    Hi. No... I can not turn it on with power button. I have tried the board in two different cases both known working also outside of case jumping power pads. Only turns on when I attach charge to magsafe. Thank you.
  13. R

    820-2850 No PPBUS_G3H

    Maybe this will help explain better than I am. In order to get it to turn back on I have to remove battery and magsafe. I do get ppbus from battery. Thanks.
  14. R

    820-2850 No PPBUS_G3H

    Will not power on from battery at all. Will power on by itself when I plug in the magsafe. This occurs with battery or without battery. Once I cut the power from power button, it will not turn back on from power button. When I press the power button the light on the charger goes from amber to...
  15. R

    820-2850 No PPBUS_G3H

    HI. Replaced ISL 6259. I have 2.9 Ohm between 17/18 and 20.1 between 27/28. Same outcome. Thank you.
  16. R

    A1398 Display Problems 820-3787

    Hi. I have this machine that a shop technician forced the LCD cable in crooked and broke a piece off in the LCD connector. I have change the LCD connector and tried with known working LCD/cable with the same result. Sorry for not leaving any measurements. I had to leave early and wanted to ask...
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    [SOLVED]820-3115 30 seconds after boot screen scrambles

    No... Tapping on board and RAM slot didn't make a difference. It would boot up, get to OS for like 30 seconds. Then the screen would go white with full spectrum of color static, then go black. After that happened a couple times that computer would just not POST anymore, just turn on with fans at...
  18. R

    [SOLVED]820-3115 30 seconds after boot screen scrambles

    Hi. I have an A1278 that after 30 seconds the screen scrambles. At first, my thought was that it was going to be an LCD/cable replacement. I removed the board to look it it over and found that U2600 and the area around it was liquid damaged. I have already replaced the damaged components and...
  19. R

    820-2850 No PPBUS_G3H

    Tried reflow on SMC. No go. Still same issue. I also notice when I press the power button to turn on computer the fans twitch very slightly. Thanks.
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