820-00923 5v Stuck

[DaveDD]

Hi All!
Got this board stuck on 5v - 0,34 amp not switching to 20v.
Replaced U3200 because it gets very hot when charger is connected.
Now the board is freezed at 5v - 0.03 amp.
All the CD3215 seems to work fine, all the LDO lines are stable at 1,80v
PPDCIN_G3H_CHGR =5v
PP3V3_G3H=3,4

Missing PPBUS_G3H
Q7030 not switched on.
TBA_GATE_Q1=0v
TBA_GATE_Q2=0v
L7030 Pin 1=0V

So the problem in ISL 9239 am I right?
I don't have a donor and i don't have the ic right now, so while i'm buying it and wait for delivery there's something that i can do to sort out the problem?
Thank you.

 

[2informaticos]

"all the LDO lines are stable at 1,80v"
Should start clarifying this; there are 1V1 and 3V3 LDOs too!

Post U7000 basic voltages; P_IN, AUX_DET, VDDA/P, SMC_RST*, AUX_OK.
Check diode mode to ground at F7000.

What about PPBUS_G3H and USB-C inputs when battery and charger are both connected?

 

[DaveDD]

diode mode to ground at F7000= 0.434
P_IN=5,18v
AUX_DET=1,29v
VDDA=4,99v
VDDP=4,99v
SMC_RST=3,4v
AUX_OK=3,4v

When battery+Charger connected.
PPBUS_G3H come up at 12,50v
And USB-C goes 20v but 0amp

 

[2informaticos]

So you have a problem on USB-C areas; don't switch to 20V without battery.
All USB-C ports have the same behavior (without battery)?
Check each one on both connection ways.

When battery is connected, any reaction pressing power button?

 

[DaveDD]

OK so let's do a RECAP because I'm really confused right now.

WITHOUT BATTERY CONNECTED:
All 4 USB ports in all position drain 5v , 0,03 amp.

WITH BATTERY CONNECTED:
Macbook powers on when I open lid. Power button is unresponsive, touch id works.
USB-C on the left side report 20v, 0 amp in all positions.
USB-C on the other side doesn't even light up the USB meter.
No way to charge macbook.

 

[2informaticos]

So your problem is USB-C related; rest of the board works.

Check ALL LDOs of CD3215 chips.
Be aware, 1V1 LDO appears ONLY on the powered port at time.
Also compare diode mode to ground readings between all ports.

 

[DaveDD]

For the LDO's measurements I assume with battery disconnected , right?

 

[DaveDD]

U3200
PP3V3_UPC_XB_LDO 0,517 3,36v
PP1V8_UPC_XB_LDOA 0,518 1,79
PP1V8_UPC_XB_LDOD 0,484 1,79
PP1V1_UPC_XB_LDO_BMC 0,51 0v
NO CHANGES even with adapter connected

U3100
PP3V3_UPC_XA_LDO 0,508 3,37
PP1V8_UPC_XA_LDOA 0,497 1,8v
PP1V8_UPC_XA_LDOD 0,463 1,79v
PP1V1_UPC_XA_LDO_BMC 0,488 0v
NO CHANGES even with adapter connected

UB300
PP3V3_UPC_TA_LDO 0,509 3,35v
PP1V8_UPC_TA_LDOA 0,496 1,79v
PP1V8_UPC_TA_LDOD 0,463 1,78v
PP1V1_UPC_TA_LDO_BMC 0,484 0v
Switch to 1,1v when adapter is connected

UB400
PP3V3_UPC_TB_LDO 0,509 3,35v
PP1V8_UPC_TB_LDOA 0,487 1,79v
PP1V8_UPC_TB_LDOD 0,453 1,79v
PP1V1_UPC_TB_LDO_BMC 0,478 0v
Switch to 1,1v when adapter is connected

 

[2informaticos]

Then you have a problem on U3100/200 area.
Did you replace U3200 with correct CD3215 version?
Inspect U2890 traces and resistors for corrosion.

 

[DaveDD]

CD3215C00 that comes from a store, Not donor.I have 3 more and i can pull one from a donor 820-00840.
U2890 seems fine. All resistor are Ok ohm value.
Get 3,3v on pin 8.

 

[DaveDD]

I've also checked J3300 and JB500 diode mode reading, everything is OK according to logikiwi EXCEPT pin 23 on J3300
USBC_XB_USB_BOT_N measure 1.010 in diode mode instead of OL.

Edit: fixed by changing diode.

 

[DaveDD]

Back again on this board after a busy week.
so LDO_BMC on U3200 and U3100 did not get to 1,1v when adapter is connected.
U2890 is missing clock. I don't have an oscilloscope but the measurement on Pin 1 of R3095 stays stable at 0,2v.

On the other side, on pin 1 of RB280 i have 1,1v but I see "movement" on the lower bar of multimeter and it looks more similar to a "working" clock signal.

Why I don't get proper clock on U2890? Looking at schematics seems that clock is generated from U3200 pin 3 right? Not from U2800...
I've already replaced U3200 twice and I checked trace between pin 3 of U3200 and pin 2 of R3095.. my measure is 1,8ohm.. is this acceptable or i need pure 0ohm?

Thank you in advance!

 

[2informaticos]

Multimeter leads resistance enters there too; 1-2 ohm is good reading.

There must be a problem with U3100/200, or surrounding components.
Compare diode mode readings around U3100/200 with UB300/400 area.
There may be bad resistor, broken trace...

 

[DaveDD]

Late post for an already solved board issue. I forgot to reply last time...
Just to share my experience with the forum, maybe can help someone in the future.

Issue was simple.
Fake/not working CD321500C chips.
Bought them from a thrusted seller, i've already bought those in the past from this guy. Never had issues before.

After spending days wondering why LDO_BMC stays 0v even with charger connected.... I replaced both CD3215 left side from donor board and voilà...
motherboard now works flawlessy.

With the crappy chips all others LDO voltage were fine, and also diode mode readings ... That's why I get caught up.
I tried 5 of them , same problem. Throw directly to the bin.

Thanks anyway for your time.