a1707 820-00281 no power stuck at 5v

[lordgeny]

Re: a1707 820-00281 no power stuck at 5v

first time after the replecement i got 200ma 5v ..... getting crazy.....

[mon2]

Re: a1707 820-00281 no power stuck at 5v

1) What is the voltage of PP3V3_G3H @ L6900, pin #2 ?

2) What is the voltage of PPBUS_G3H @ fuse F7000 ?

[lordgeny]

Re: a1707 820-00281 no power stuck at 5v

1) What is the voltage of PP3V3_G3H @ L6900, pin #2 ? 3.4

2) What is the voltage of PPBUS_G3H @ fuse F7000 ?

f7000 0.90v

[mon2]

Re: a1707 820-00281 no power stuck at 5v

1) What is the voltage of PP3V3_G3H @ L6900, pin #2 ?

2) remove the fuse @ F7000. Test the voltage of ppbus_g3h at the pcb pad of F7000, pin #1. Post the reading.

[lordgeny]

Re: a1707 820-00281 no power stuck at 5v

l6900 pin 2 3.40v

f7000 pin 1 no voltage

[mon2]

Re: a1707 820-00281 no power stuck at 5v

What is the voltage at R7060 ?

[lordgeny]

Re: a1707 820-00281 no power stuck at 5v

r7060 no voltage

[mon2]

Re: a1707 820-00281 no power stuck at 5v

Meter in DIODE mode. No power to the board.

Check the diode readings to ground of F7000, pin #1 in both directions.

Post the readings.

[lordgeny]

Re: a1707 820-00281 no power stuck at 5v

0.380

[lordgeny]

Re: a1707 820-00281 no power stuck at 5v

without fuse i have pin 2 0.380 pin 1 0.480

[Arshad alam4659]

i have 820-00928-A stuck at 5v on USB. I measured some volt
PP20V_USBC_XB_VBUS = 5v
PP3V3_UPC_XB_LDO = 3.3v
PP1V8_UPC_XB_LDOA = 1.8v
PP1V8_UPC_XB_LDOD = 1.8v
PP1V1_UPC_XB_LDO_BMC = 1.1v , sometime fluctuate to 0.6v no sorting
PPDCIN_G3H = 5v
i change cd3215 but nothing change anyone suggest me the solution

[mon2]

The ldo voltage for the bmc should be stable. Check the CCx contacts. Check their measurements in diode mode. No power. Meter in diode mode. Red probe to ground. Black probe to the CCx line. Test each cd3215 this way. The CCx lines communicate the power delivery contracts where default is 5 volts on power up.

[Arshad alam4659]

one cd3215 is bad i removed cd3215 but 20v not generate what next step

[Arshad alam4659]

The ldo voltage for the bmc should be stable. Check the CCx contacts. Check their measurements in diode mode. No power. Meter in diode mode. Red probe to ground. Black probe to the CCx line. Test each cd3215 this way. The CCx lines communicate the power delivery contracts where default is 5 volts on power up.

can you suggest me

[mon2]

Which cd3215 was bad on the board?

Has this bad cd3215 been replaced with a known good part?

which exact cd3215 was used for the replacement?

soldering ok?

Each cd3215 must be onboard as they function in a master & slave relationship.

what is the voltage to ground now of ppbus_g3h?

see this article here:

https://logi.wiki/index.php/CD3215_Bootup_Sequence

[Arshad alam4659]

Which cd3215 was bad on the board?

Has this bad cd3215 been replaced with a known good part?

which exact cd3215 was used for the replacement?

soldering ok?

Each cd3215 must be onboard as they function in a master & slave relationship.

what is the voltage to ground now of ppbus_g3h?

see this article here:

https://logi.wiki/index.php/CD3215_Bootup_Sequence

PPBUS_G3H =0v
i read this artical and 1 to 11 sequence all ok but 12 sequence is 20v but 20v not generate
i dont understand what missing volt
if i injected 5v on ppbus_g34 ampare is 0.0065

[mon2]

PPBUS_G3H =0v

Remove all power. Meter in resistance mode. Measure the resistance to ground of PPBUS_G3H.

Post the measurement.

[Arshad alam4659]

Remove all power. Meter in resistance mode. Measure the resistance to ground of PPBUS_G3H.

Post the measurement.

PPBUS_G3H = OL

[Arshad alam4659]

Remove all power. Meter in resistance mode. Measure the resistance to ground of PPBUS_G3H.

Post the measurement.

left side 2 cd3215 and right side 2 cd 3215 if i soldered one side 2 cd 3215 all ldo ok but i soldered seacond side cd 3215
ldo flactuate 2.5 to 3.3v and PP1V1_UPC_XB_LDO_BMC = 0.6 to 1.1 and also flactute PPDCIN_G3H =3.1 to 5v but one side no flactuate volt in stable
but 20v not generate