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OLD 820-2978 No PM_SLP_S4_L

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  • Bouba148
    replied
    Removed R5385 for SMC_PBUS_VSENSE: NOK
    with R5385 still removed I've also removed R5309 for SMC_CPU_VSENSE still :NOK

    Next step will be to remove all the resistors that bringing all the I and V sense rails to the SMC, if still not OK so in that case I would suspect the SMC.......
    What do you think?

    Leave a comment:


  • Bouba148
    replied
    removed R2598, and tryied to start the board in normal mode: NOK
    On the board the pin1 ( SMC_N_FOLLOW ) is still 2.5V but as removed R2598: 0V on pin 2.

    Something is still preventing the SMC to turn ON the board:
    I will double check SMC_PBUS_VSENSE and SMC_CPU_VSENSE as they're higher that the other rails.....

    Leave a comment:


  • Bouba148
    replied
    On Charger:

    SMC_CPU_ISENSE: 0V
    SMC_CPU_VSENSE: 0V
    SMC_DCIN_ISENSE: 0.039V
    SMC_PBUS_VSENSE: 0V
    SMC_BATT_ISENSE: 0.069V
    SMC_NB_MISC_ISENSE: 0V
    SMC_MCP_VSENSE: 0V
    SMC_CPU_FSB_ISENSE: 0.610V
    SMC_MCP_CORE_ISENSE: 0V
    SMC_MCP_DDR_ISENSE: 0V

    SMC BYPASS:
    SMC_CPU_ISENSE: 0.380V
    SMC_CPU_VSENSE: 1.162V
    SMC_DCIN_ISENSE: 0.454V
    SMC_PBUS_VSENSE: 2.073V
    SMC_BATT_ISENSE: 0.068V
    SMC_NB_MISC_ISENSE: 2.495V
    SMC_MCP_VSENSE: 1.225V
    SMC_CPU_FSB_ISENSE: 0.738V
    SMC_MCP_CORE_ISENSE: 0.610V
    SMC_MCP_DDR_ISENSE: 0.303V

    On Battery

    OFF:
    SMC_CPU_ISENSE: 0V
    SMC_CPU_VSENSE: 0V
    SMC_DCIN_ISENSE: 0V
    SMC_PBUS_VSENSE: 0V
    SMC_BATT_ISENSE: 0V
    SMC_NB_MISC_ISENSE: 0V
    SMC_MCP_VSENSE: 0V
    SMC_CPU_FSB_ISENSE: 0.599V
    SMC_MCP_CORE_ISENSE: 0V
    SMC_MCP_DDR_ISENSE: 0V

    ON:
    SMC_CPU_ISENSE: 0.370V
    SMC_CPU_VSENSE: 1.162V
    SMC_DCIN_ISENSE: 0.454V
    SMC_PBUS_VSENSE: 1.727V
    SMC_BATT_ISENSE: 0.658V
    SMC_NB_MISC_ISENSE: 2.495V
    SMC_MCP_VSENSE: 0.950V
    SMC_CPU_FSB_ISENSE: 0.540V
    SMC_MCP_CORE_ISENSE: 0.322V
    SMC_MCP_DDR_ISENSE: 0.008V
    Last edited by Bouba148; 08-16-2019, 06:55 PM.

    Leave a comment:


  • Bouba148
    replied
    On Charger:

    OFF SMC BYPASS:
    SMC_CPU_ISENSE: 0V 0.380V
    SMC_CPU_VSENSE: 0V 1.162V
    SMC_DCIN_ISENSE: 0.039V 0.454V
    SMC_PBUS_VSENSE: 0V 2.073V
    SMC_BATT_ISENSE: 0.069V 0.068V
    SMC_NB_MISC_ISENSE: 0V 2.495V ?
    SMC_MCP_VSENSE: 0V 1.225V
    SMC_CPU_FSB_ISENSE: 0.610V 0.738V
    SMC_MCP_CORE_ISENSE: 0V 0.610V
    SMC_MCP_DDR_ISENSE: 0V 0.303V

    On Battery:

    OFF: ON:
    SMC_CPU_ISENSE: 0V 0.370V
    SMC_CPU_VSENSE: 0V 1.162V
    SMC_DCIN_ISENSE: 0V 0.454V
    SMC_PBUS_VSENSE: 0V 1.727V
    SMC_BATT_ISENSE: 0V 0.658V
    SMC_NB_MISC_ISENSE: 0V 2.495V ?
    SMC_MCP_VSENSE: 0V 0.950V
    SMC_CPU_FSB_ISENSE: 0.599V 0.540V
    SMC_MCP_CORE_ISENSE: 0V 0.322V
    SMC_MCP_DDR_ISENSE: 0V 0.008V


    Last edited by Bouba148; 08-16-2019, 06:44 PM.

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  • Bouba148
    replied
    yes

    PP3V3_S5_AVREF_SMC: 3.299V

    You wrote: "If board always starts in SMC bypass mode, should be an I/VSENSE sensor issue."

    So I'll check all the I/V sense signals at page 39 , 43 , 44, 51 etc....
    In the mean time I've noticed that it is not charging the battery as it's pulling only 30 mA, which could make sense as for security: I/V sense issue ---> STOP CHARGING Am I right?
    Last edited by Bouba148; 08-15-2019, 07:49 PM.

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  • 2informaticos
    replied
    Looks good...

    If board always starts in SMC bypass mode, should be an I/VSENSE sensor issue.
    Do you get AVREF_SMC?

    Leave a comment:


  • Bouba148
    replied
    SMC_PBUS_VSENSE is 0V with the charger and 1.8V when ON with the battery......

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  • 2informaticos
    replied
    Check SMC_PBUS_VSENSE level.

    Leave a comment:


  • Bouba148
    replied
    I'm mesuring 2.9Ohms directly on pins 17/18 of the ISL, if you remove around 1 Ohm of the fluke probes it's OK.

    Triple Checked the soldering there shoud be OK , what do you think?

    ISL R17_18.jpg

    Leave a comment:


  • JohnB8812
    replied
    Check 17/18 and 27/28 again on the PINS of the ISL. I bet there’s still an issue with 17/18

    Leave a comment:


  • Bouba148
    replied
    I came back to that board and noticed that I've lost the ppbus with the charger (0.7V) so I decided to check with the battery only: the U7000 fried!
    Replaced,checked R17/18 and R27/28 before putting back under power: R17/18 too high: 174Ohms checked my soldering job around ISL, found out R7051 too high, replaced it.
    Then PPBUS 12.67V with official 85W charger but slowly dropping down then pulsing in loop.
    Reflowed U7200.
    Now PPBUS 12.67V solid and stable.
    Machine turning ON with charger only in SMC bypass mode or with battery.

    with charger only (board not turning ON ):CHGR_BMON : 0.07V
    with charger only in SMC bypass mode CHGR_BMON: 0.069V
    with the battery only, board OFF: CHGR_BMON: 0.07V
    with the battery board ON: around 0.600V

    Exact same values in same configuration for SMC_BATT_ISENSE

    Leave a comment:


  • 2informaticos
    replied
    Then R5431 is soldered.

    "Already checked R17/18: 3 Ohms"
    Did you check directly between pins?

    "CHGR_BMON: 0.068V with charger only"
    "SMC_BATT_ISENSE: 0.598V with both battery and charger: 0.6V"
    Please confirm values.
    High CHGR_BMON can block SMC.
    This will explain starting on SMC bypass...

    Leave a comment:


  • Bouba148
    replied
    Hi 2Informaticos,

    I'm surprised to notice that there no U5413 on that 820-2879 Board........interesting no?.................hummmmm!
    I should maybe work with some other board schematic or think about U7000?

    Model Number.jpgU5413.jpg
    Attached Files
    Last edited by Bouba148; 07-13-2019, 06:16 AM.

    Leave a comment:


  • 2informaticos
    replied
    Check for corrosion around U5413; may need to change it.

    Leave a comment:


  • Bouba148
    replied
    CHGR_AMON: 0.031V with charger only
    CHGR_BMON: 0.068V with charger only

    Leave a comment:

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