820-02773 MacBook Pro 13'' M2 A2338 get 5V 0A does not boot

[slimmy182]

Following @farfan14 post on diode mode to ground compare with good board


good board farfan14 measurement / my faulty board format:


PPBUS_AON 12.28v 480/ 588 12.32V

PP3v8_AON 3.8v 157/ 374 3.77V

PP3v3_S2 0v 402/ 470 0V

P3V3S2_SW 0v 402/ 470 0V

P3v3S2_EN 0v 703/ 950 0V

PP1V8_S2 0V 336/ 392 0V

P3V3S2_DSCHG_EN_RC 3.45V 523/ 578 3.40V

PP5v_S2 0v 435/ 518 0V

PP1v25_S2 0V 243/ 272 0V

PP3V3_S2
USBLS1_ISNS 0V 445/ 485 0V

PP3V3_S2SW_SNS 0v 493/ 599 0V

PP3V3_S2_LDO 0v 445/ 484 0V

PP3V3_S2_WLBT_ISNS 0v 402/ 465 0V


QC410
1 GND
2 P3V3_S2_PWR_EN_R 0V
3 P3V3S2_DSCHG 0V
4 GND
5 P3V3S2_DSCHG_EN_RC 3.4V
6 P3V3S2_DSCHG_EN_RC 3.4V

 

[2informaticos]

I see big differences for some readings.
You can accept 484 instead of 445 (484/445), 272/243, even 392/336.
However, 588/480, 599/493, 518/435, or 374/157 don't look good at all.

Higher values than normal should be caused by bad solders, broken/corroded traces.

 

[slimmy182]

Unfortunately i'm not able to sop any bad solder or broken traces. There is any advice how to do that? really thank you.

Anyway I post also that measures, is everything right with U5700?

U5700

1 P3V8AON_DRVL1 0v
2 P3V8AON_SW1 3.77v
3 P3V8AON_DRVH1 3.68v
4 P3V8AON_BST1 4.50v
5 P3V8AON_PVCC 5.02v
6 PP5V_S2_P3V8AON_VDRV 0v
7 PP5V_AON 5.01
8 PPBUS_VMAIN_VIN_ISNS 12.32v
9 GND
10 GND
11 P3V8AON_GPIO 0v
12 P3V8AON_PWR_EN_R 0.07/0.77v then 0v and again
13 P3V8AON_LPM_R 0v
14 P3V8AON_FAULT_L 4.80v
15 P3V8AON_VSENSE 3.77
16 P3V8AON_VRTN 0v
17 P3V8AON_SS 4.86
18 P3V8AON_IMON_P3V8AON 0.02v
19 P3V8AON_ISEN1_P 3.77V
20 P3V8AON_ISEN1_N 3.77V
21 P3V8AON_ISEN2_P 3.77V
22 P3V8AON_ISEN2_N 3.77V
23 P3V8AON_ISEN3_P 3.77V
24 P3V8AON_ISEN3_N 3.77V
25 P3V8AON_DRVL3 0v
26 P3V8AON_SW3 3.77
27 P3V8AON_DRVH3 3.77v
28 P3V8AON_BST3 8.71v
29 P3V8AON_BST2 8.73v
30 P3V8AON_DRVH2 3.77
31 P3V8AON_SW2 3.77
32 P3V8AON_DRVL2 0v
33 GND

 

[2informaticos]

Don't waste time with U5700, if you get correct 3V8_AON voltage.

 

[slimmy182]

Right. Is worth to force DFU mode? How I can do it in this board?
Thank you!

 

[slimmy182]

I was not able to access DFU mode. Anyway JT400 (trackpad connector) it's water damaged. When the flex cable is connected i got short to ground on PPBUS_AON.

 

[2informaticos]

Change the connector and clean the board pads as best as possible.
Check diode mode to ground on the pads, before soldering new connector.

 

[slimmy182]

Connector changed. Here it is diode mode to ground on the pads.

 

[2informaticos]

I don't have another board for comparison.
If nothing strange there, connect trackpad.
Find convenient test points and check again, just in case trackpad board/flex may have corrosion.
If all good, apply power...

 

[slimmy182]

All seems to be good, PPBUS_AON 12.30V now. Anyway the board itself is in the same condition as before.

 

[2informaticos]

Try again DFU.
Be aware, M1 and T2 have different manner to access DFU...

 

[slimmy182]

Forcing DFU need to be done bridging these pads? Or you mean by standard way?

 

[2informaticos]

Forcing DFU with dedicated pads is the fastest way.
However, try first in normal way, with keyboard.

 

[slimmy182]

Yes, this is M2 but the process is the same for M1 MacBook Pro 13". Anyway no luck on getting DFU whit keyboard thing. Maybe I need to try DFU force using jumper? Wich pads I have to bridge with SOC_FORCE_DFU ? thank you.

 

[2informaticos]

SV004, or SV005.
You must cut the wire, once machine is detected.

 

[slimmy182]

Unfortunately both bridge mode and keyboard one don't let me DFU the board

 

[2informaticos]

Solder RV005, if is not there...

 

[slimmy182]

Tried with RV005, but no luck. The fact is that I don’t have any voltage in PP1V25_S2. Additionally, PP3V3_AON is at 0.35V.

 

[2informaticos]

Check all U8110 LDOs, page 37.
Don't bother with the onse marked "NC".
If any missing, check diode mode to ground.

Also check RD570 and its traces.