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A1398 820-3662-A Not powering on
- Thread starter dam1inc
- Start date
Not powering on and all power rails are present, impossible at same time!
Please explain correctly.
Does the board stay on, but no video, nor USB activity present???
Please explain correctly.
Does the board stay on, but no video, nor USB activity present???
dam1inc
Member
Oh sorry, here is the read outs from just the board plugged into the magsafe. I just tested again and there are two rails no voltage. But when assembled, No power, no video, no usb activity
PPBUS_G3H = 12.6
PPVIN_S5_HS_COMPUTING_ISNS = 12.6
PPVIN_S5_HS_OTHER3V3_ISNS = 12.6
PPDCIN_G3H = 18.5
PPDCIN_G3H_ISOL = 18.5
PP3V42_G3H = 3.42
PPVRTC_G3H = 3.3
PP5V_S5 = 5
PP5V_S4 = 5
PP5V_S3 = 5
PP5V_S0 = 5
PP3V3_S5 = 3.3
PP3V3_S4 = 3.3
PP3V3_SUS = 3.3
PP3V3_S3 = 3.3
PP3V3_S0 = 3.3
PP3V3_S3RS0_CAMERA = 3.3
PP1V35_S3 = 1.35
PP1V35_S3_MEM = 1.35
PP1V35_S3RS0_CPUDDR = 1.35
PP1V35_S3RS0_FET = 1.35
PP1V5_S0 = 1.5
PPVCC_S0_CPU = 1.8
*PPBUS_SW_BKL = 0
PP3V3_TBTLC = 3.3
*PP15V_TBT = 0
PPBUS_G3H = 12.6
PPVIN_S5_HS_COMPUTING_ISNS = 12.6
PPVIN_S5_HS_OTHER3V3_ISNS = 12.6
PPDCIN_G3H = 18.5
PPDCIN_G3H_ISOL = 18.5
PP3V42_G3H = 3.42
PPVRTC_G3H = 3.3
PP5V_S5 = 5
PP5V_S4 = 5
PP5V_S3 = 5
PP5V_S0 = 5
PP3V3_S5 = 3.3
PP3V3_S4 = 3.3
PP3V3_SUS = 3.3
PP3V3_S3 = 3.3
PP3V3_S0 = 3.3
PP3V3_S3RS0_CAMERA = 3.3
PP1V35_S3 = 1.35
PP1V35_S3_MEM = 1.35
PP1V35_S3RS0_CPUDDR = 1.35
PP1V35_S3RS0_FET = 1.35
PP1V5_S0 = 1.5
PPVCC_S0_CPU = 1.8
*PPBUS_SW_BKL = 0
PP3V3_TBTLC = 3.3
*PP15V_TBT = 0
Test the board alone on the desk; disconnect any other cable, keep only charger.
Use a macOS pendrive (with Link LED) attached to onboard USB port.
If LED flashes, there is USB activity for sure.
Do not waste time measuring same power rail in different points.
You will get the same voltage; unless trace is broken.
Do not expect a Thunderbolt related voltage, until a device is connected.
Do not search backlight voltages/signals for a board without internal image, nor USB activity.
Battery is charging?
Do you have original 60/85W Magsafe 2 charger?
Just in case, try known good working BIOS.
Use a macOS pendrive (with Link LED) attached to onboard USB port.
If LED flashes, there is USB activity for sure.
Do not waste time measuring same power rail in different points.
You will get the same voltage; unless trace is broken.
Do not expect a Thunderbolt related voltage, until a device is connected.
Do not search backlight voltages/signals for a board without internal image, nor USB activity.
Battery is charging?
Do you have original 60/85W Magsafe 2 charger?
Just in case, try known good working BIOS.
"how to test if battery is charging if laptop has no power?"
Monitor PPBUS_G3H with charger and battery, both connected.
Monitor PPBUS_G3H with charger and battery, both connected.
Of course...
PPBUS_G3H should slightly increase, according with battery level.
PPBUS_G3H should slightly increase, according with battery level.
These boards are from worst Apple series.
In theory, should start without battery; with proper charger, original 60/85W Magsafe 2.
Post exact PPBUS_G3H voltage with charger; w/ and w/o battery connected.
In theory, should start without battery; with proper charger, original 60/85W Magsafe 2.
Post exact PPBUS_G3H voltage with charger; w/ and w/o battery connected.
Looks like battery is not recognized.
The value is a bit high, I recommend you to change your multimeter battery.
The value is a bit high, I recommend you to change your multimeter battery.
In fact, looking at posted volatges, board turned on; but not working.
May be damaged CPU because of FDMF6808 chips.
May be damaged CPU because of FDMF6808 chips.
That is sign of charging battery.
Still not working then?
Tested USB activity on USB onboard port?
Still not working then?
Tested USB activity on USB onboard port?
Probably CPU issue...