A1708 820-00840-A 5V 80-100mA

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

If you remove them you will get nothing, maybe try to remove R7020 and D6905 first and see if it is still cycling. If still most likely the CD3215, if not the probably an ISL related issue

I try to reflow the 2 cd3215. Now my amp meter is cycling too and i have PP1V1_UPC_XB_LDO_BMC back and cycling like the other rails. Bad cd3215?

[Win Me]

Re: A1708 820-00840-A 5V 80-100mA

Yes, now 99% bad CD3215. But still could be the thunderbolt ROM, but it is pretty rare for it to fail when no corosion.

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

Post the resistance to ground readings for the attached D6950 device.

Remove all power. Meter in resistance mode (2k scale).

Red meter probe on point to test; Black to ground (shield is ok).

Also, with all power removed, meter in DIODE mode.

Check & post the measurements for each CC1/CC2 line. Red meter probe to GROUND; Black meter probe to point to test in DIODE mode.

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

Yes, now 99% bad CD3215. But still could be the thunderbolt ROM, but it is pretty rare for it to fail when no corosion.

Ok! When the new cd3215 arrive i will post again adding some information. Thanks for your help
Im going to open a new thread about another board like this one. I hope you can help me too!

[Win Me]

Re: A1708 820-00840-A 5V 80-100mA

It's always nice to try to help people!

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

Post the resistance to ground readings for the attached D6950 device.

Remove all power. Meter in resistance mode (2k scale).

Red meter probe on point to test; Black to ground (shield is ok).

Also, with all power removed, meter in DIODE mode.

Check & post the measurements for each CC1/CC2 line. Red meter probe to GROUND; Black meter probe to point to test in DIODE mode.

This are the measuresment:
D6950 in resistance mode: Pin1: 3,3Mohm / Pin2: 878Kohm / Pin3: 2,6Mohm
D6950 in diode mode: Pin1: 0,440V / Pin2: 0,555V / Pin3: 0,552V

U3200 diode mode: CC1: 0,599V / CC2:0,604V
U3100 diode mode: CC1: 0,604V / CC2:0,614V

Thank you for helping me too!

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

Can you check your measurements again ?

Remove all power. Meter in 2k scale.

D6950 in resistance mode: Pin1: 3,3Mohm / Pin2: 878Kohm / Pin3: 2,6Mohm
D6950 in diode mode: Pin1: 0,440V / Pin2: 0,555V / Pin3: 0,552V

Red meter probe to pin to test; Black meter probe to GROUND.

If done properly, Pin # 3 should have been 0 ohms.

Then place meter in DIODE mode.

RED METER probe to GROUND (yes Ground); Black meter probe to pin to test.

If done properly, pin # 3 should be 0V.

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

Sorry mon2! My fault! i measured D6905...
This are the measuresment:
D6950 in resistance mode: Pin1: 102Kohm / Pin2: 120Kohm / Pin3: 0,3ohm
D6950 in diode mode: Pin1: 0,430V / Pin2: 0,430V / Pin3: 0,009V

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

Ok. So D6905 is not at fault.

You mentioned that PPBUS_G3H is not working - is this still correct ?

If yes, remove F7000 fuse (for now). Test again.

Do you see PPBUS_G3H working from the ISL side of the design ?

Respectively, remove all power - meter in 2k scale mode - check the resistance to ground on both, pad #1 on F7000 and then again for pad #2 on F7000.

The ISL is a buck / boost regulator and it should be working before we can move forward. The 20V is a separate issue.

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

Yes, PPBUS_G3H is not working. I removed the fuse and still nothing. Resistance to ground in Pin1: 2,5 Mohm and in Pin2: 940Kohm

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

Post the voltage (with adapter) for:

TBA_AUX_DET

TBA_CSIR_P

TBA_CSIR_N

These are tiny parts so proceed with care.


C7025 (can be any point on the capacitor cluster)

Are these voltages stable or also pulsing ?

Next, remove all power -> meter in resistance mode again (2k scale).

Post the resistance to ground for C7025 capacitor cluster.

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

TBA_AUX_DET: 1,3V pulsing

TBA_CSIR_P: 5,2V pulsing

TBA_CSIR_N: 5,2V pulsing

C7025: 5,2V pulsing / 3Mohm

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

Voltage reading for SMC_RESET_L?

Remove the battery. Using only the power adapter, post the voltages of the power rails for each CD3215.

U3100 and U3200

Pin 2 PP1V8_UPC_XB_LDOD
Pin 10 PPDCIN_G3H
Pin 11 PP5V_S4
Pin 12 PP3V3_UPC_XB_LDO
Pin 35 PP1V1_UPC_XB_LDO_BMC
Pin 70 PP20V_USBC_XB_VBUS
Pin 75 PP1V8_UPC_XB_LDOA

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

SMC_RESET_L: 3,4V pulsing

I connect the power adapter to the farthest usb-c port from trackpad

U3200:
Pin 2 PP1V8_UPC_XB_LDOD: 1,79V pulsing
Pin 10 PPDCIN_G3H: 5,2V pulsing
Pin 11 PP5V_S4: 0V
Pin 12 PP3V3_UPC_XB_LDO: 3,37V pulsing
Pin 35 PP1V1_UPC_XB_LDO_BMC: 1,1V pulsing
Pin 70 PP20V_USBC_XB_VBUS: 5,2V pulsing
Pin 75 PP1V8_UPC_XB_LDOA: 1,79V pulsing

U3100:
Pin 2 PP1V8_UPC_XB_LDOD: 1,785V pulsing
Pin 10 PPDCIN_G3H: 5,2V pulsing
Pin 11 PP5V_S4: 0V
Pin 12 PP3V3_UPC_XB_LDO: 3,37V pulsing
Pin 35 PP1V1_UPC_XB_LDO_BMC: 0V
Pin 70 PP20V_USBC_XB_VBUS: 0V
Pin 75 PP1V8_UPC_XB_LDOA: 1,79V pulsing

Now, I connect the power adapter to the closest usb-c port from trackpad

U3200:
Pin 2 PP1V8_UPC_XB_LDOD: 1,79V pulsing
Pin 10 PPDCIN_G3H: 5,2V pulsing
Pin 11 PP5V_S4: 0V
Pin 12 PP3V3_UPC_XB_LDO: 3,37V pulsing
Pin 35 PP1V1_UPC_XB_LDO_BMC: 1V pulsing
Pin 70 PP20V_USBC_XB_VBUS: 0V
Pin 75 PP1V8_UPC_XB_LDOA: 1,8V pulsing

U3100:
Pin 2 PP1V8_UPC_XB_LDOD: 1,785V pulsing
Pin 10 PPDCIN_G3H: 5,2V pulsing
Pin 11 PP5V_S4: 0V
Pin 12 PP3V3_UPC_XB_LDO: 3,37V pulsing
Pin 35 PP1V1_UPC_XB_LDO_BMC: 1,1V pulsing
Pin 70 PP20V_USBC_XB_VBUS: 5,2V pulsing
Pin 75 PP1V8_UPC_XB_LDOA: 1,79V pulsing

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

Flux and remove D6950. Test again.

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

When i reconnect the battery in pin 1 of the of F7000 i have 10,1V (i don´t have the fuse solder in place), thats the voltage of the battery, am i right? so ppbus_g3h is created.

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

See attached.

When you connect the battery - the battery mosfet @ Q7065 is enabled and allows for the flowing of measured voltage onto pad # 1 of F7000.

When you mate the battery - post the voltage on pin # 4 of Q7065 mosfet.

It does seem to indicate that the ISL is supplying the charge voltage to ENABLE this mosfet (unless the mosfet is shorted and is just allowing this to pass through).

After this test, remove all power / no battery.

Meter in resistance mode (2k scale) -> measure & post:

resistance between

source & drain
source (1-2-3) & gate (4)
gate(4) & drain (5-6-7-8)

for Q7065.

Post the voltage @ PP3V3_G3H.


Still interested to hear about your testing after D6950 is removed.

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

i removed D6950. Still no PPBUS_G3H.
I reconnect the battery and in Pin 4 of Q7065 mosfet i have 9,6V.

Resistance measuresment:

source & drain: Open Line
source (1-2-3) & gate (4): 10,53Mohm
gate(4) & drain (5-6-7-8): 6,12Mohm

PP3V3_G3H voltage with only battery connected is 0V. With only the adapter is 3,4V

[mon2]

Re: A1708 820-00840-A 5V 80-100mA

For these tests, the fuse @ F7000 is removed ?

Is PP3V3_G3H pulsing with the adapter (only) connected ?

[Aitorflores7]

Re: A1708 820-00840-A 5V 80-100mA

Yes, the fuse F700 is removed.

Yes, with adapter only all rails are pulsing. When the amp meter cycle, the rails go down and the back up again. With the battery no PP3V3_G3H.