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820-00045 keyboard and trackpad not working

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  • ytesfay80
    replied
    Okay could you help me with which component creates the 5v_s4 rails and the 3v3_s5 rails. I'm looking at the schematic but I can't seem to find where they are created.

    I checked all the main power rails and none of them are shorted to ground in diode mode with battery disconnected.
    I checked L7520 where PP5V_S4 should be and it never has any voltage on it even when I initially plug the charger in.

    larossmann If I sent this to you how much would you charge to fix this if I send you the trackpad and cable also?
    Last edited by ytesfay80; 07-20-2017, 03:58 AM.

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  • dukefawks
    replied
    I have no idea man, you could have poked/shorted anything at this point. You fucked it up.....
    15V on E85 is the normal voltage and would indicate SMC and everything is running.

    Leave a comment:


  • ytesfay80
    replied
    I went to the power aliases page and took measurements on the G3Hot, 5v, and 3v3 rails with the charger plugged in.

    All of the "G3Hot" (Always-Present) Rails were present and measured fine except for PPVBUS_E85 which measured 14.9v instead of the 20v the schematic says.
    There was 5v on PP5V_G3H_LDO but no voltage on all the other 5v rails and nothing on any 3v3 rails.
    PP5V1_S4SW was also 0v as well.

    Leave a comment:


  • ytesfay80
    replied
    I haven't done anything to this machine except for try different flex cables. The last time I touched it was about 2days ago and it was turning on. The only thing I've messed with since then was the trackpad cable/connector while leaving the battery connected.

    Also, I measured the trackpad connector with no cables plugged in and I didnt get any voltages except for on SMC_LID, SMC_ONOFF_L and PPBUS_G3H_TPAD_FLT.

    Shouldn't the machine turn on as soon as the charger is plugged in?
    Last edited by ytesfay80; 07-19-2017, 03:11 AM.

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  • ytesfay80
    replied
    Okay could you just help me to get it back working as it was before so I can send it back to the customer working as it was before.
    Now when I plug in the charger the machine doesn't turn on. Before the customer would keep it in sleep mode and I have a usb keyboard that would wake it up from sleep but its not turning on anymore.
    I disconnected the keyboard and trackpad cables and plugged in the charger to see if the screen would turn on but it doesn't.
    I get 3.3v on PP3V3_S0SW_LCD of j8300.
    I also still got 8.2v on F4800 as well as 3.3v on SMC_ONOFF_L on J4801.

    I tried shorting Pin 22(SMC_ONOFF_L) of J4801 to ground but that didn't work either.
    Last edited by ytesfay80; 07-18-2017, 06:13 AM.

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  • ytesfay80
    replied
    I assumed pins 1 and 3 were on the connector that was on the trackpad but from reading the schematic it says its on the bottom side of the logic board which means I would need to disconnect the battery and measure under the board.
    Last edited by ytesfay80; 07-18-2017, 06:06 AM.

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  • dukefawks
    replied
    So 1 and 3 have 8V, did you even compare this to the schematic and how this is impossible.

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  • ytesfay80
    replied
    Originally posted by dukefawks View Post
    Come on man, missing half the pins.......
    I don't understand. I gave the measurements for even pins from 2-40 and I thought the odd numbers from 1-41 where the previous measurements I gave from the connector that is on the trackpad.
    Where are the other half of the pins so I can measure them and do I need to keep the trackpad flex cable plugged in?

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  • dukefawks
    replied
    Come on man, missing half the pins.......

    Leave a comment:


  • ytesfay80
    replied
    Okay I separated the trackpad and took these measurements with both the trackpad flex and keyboard flex plugged in.

    J4801
    Pin 40/38/36 - 7.64v
    Pins 34/32/30/28 - 0v
    Pin 26 - 3.27v
    Pin 24 - 5v
    Pin 22 - 3.3v
    Pins 20/18 - 0v
    Pin 16 - 3.3v
    Pin 14 - 4.98v
    Pin 12 - 0v
    Pin 10 - 3.28v
    Pin 8 - Pulses from around 2v down to as low as 1.8v
    Pin 6 - goes from 0.18v to 0.27v
    Pin 4 - 0v
    Pin 2 - 0v
    Last edited by ytesfay80; 07-15-2017, 03:15 PM.

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  • dukefawks
    replied
    And how would I know what is pin 1 on the trackpad connector and what that pin even is. This is all useless information.....
    Measure on the board without trackpad connected. Or don't be lazy and take a separate trackpad and connect that.

    Leave a comment:


  • ytesfay80
    replied
    The reason I'm saying that is because I have to measure on connector that is on the trackpad since I can't measure the logic board connector and have the cable plugged in at the same time.

    I got these measurements from the connector that is on the trackpad. (J4801)
    Pins 1/3 - 8v
    Pin 5 - 0v
    Pins 7/9/35/37/39/41 - 0v
    Pin 11 - 3.26v
    Pin 13 - 5v
    Pin 15 - 3.3v
    Pin 21 - 3.3v
    Pin 23 - 5v
    I'm not sure why pins 7,35,37,39 & 41 show 0v because when I measure on the other side with the cable disconnected from the trackpad
    Pins 10,36,38,&40 all give me the proper voltages.
    Last edited by ytesfay80; 07-14-2017, 05:58 PM.

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  • dukefawks
    replied
    I have no idea what you measured. Use the board view and compare the pin numbers.
    You can say left to right but how do I know which way you are looking at the machine......

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  • ytesfay80
    replied
    Okay I believe I read the schematic right on J4801 that the side where Pins 1/41 are on can be measured from the connector on the trackpad board.
    If so all the pins gave me correct readings except for Pins 7,9,35,37,39,41 which all gave me 0v.

    I measured from left to right and the first two pins on the left gave me 8v each and the third pin(I assume is Pin 5) gave me 0v.
    Last edited by ytesfay80; 07-13-2017, 10:06 PM.

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  • dukefawks
    replied
    Trackpad should work with a disconnected keyboard. Look up J4801 in the diagram and check all voltages. Check connector for corrosion.
    If you have a adapter from USBC to USB see if the trackpad works in the boot menu.

    Leave a comment:

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