A1708 820-00840-A 5V 400ma

[briancomputerdoctor]

You can't get K/M ohm values in diode mode.
Multimeter will show "V" when switched to diode mode.
However, do not post the "V" for diode mode readings; avoid misunderstoods.

Ah, okay. My mistake. I'll send the correct readings.

One USB port is damaged.
You should compare (proper) diode mode readings between both ports (on the same pins).

Could you elaborate on this, please.

 

[briancomputerdoctor]

Diode mode to ground

C7023 is showing 0.520

C7020 is showing 0.397

 

[briancomputerdoctor]

Diode mode to ground

C7030 is showing 0.380

 

[briancomputerdoctor]

Diode mode to ground

PP1V8_UPC_XA_LDOA shows 0.485
PP3V3_UPC_XA_LDO shows 0.478
PP1V1_UPC_XA_LDO_BMC shows 0.461
PP1V8_UPC_XA_LDOD 0.453

 

[briancomputerdoctor]

Diode mode to ground

PP1V8_UPC_XB_LDOA shows 0.482
PP3V3_UPC_XB_LDO shows 0.481
PP1V1_UPC_XB_LDO_BMC shows 0.458
PP1V8_UPC_XB_LDOD shows 0.449

 

[2informaticos]

LDO lines look good; as you already got correct voltages.

I said to check diode mode on the USB pins; showed on your photos.
Compare the values between both ports, on both sides.

 

[briancomputerdoctor]

USB-C pins check diode mode to ground


CD3215 side

0
OL
OL
0.132
OL
OL
OL
OL
0.132
0.331
0.329
0

0
OL
OL
0.132
OL
OL
OL
OL
0.131
0.333
0.333
0


Opposite CD3215

0
OL
OL
0.131
0.600
OL
OL
OL
0.130
0.333
0.332
0

0
OL
OL
0.130
0.596
OL
OL
OL
0.128
0.331
0.330
0

 

[2informaticos]

Do you have similar board for comparison?

 

[briancomputerdoctor]

Yes. The two damaged pins (which are on the same side of the board (CD3215 side) but different socket) are the only ones that give a different result. Those pins give OL on the damaged board and 0.600 on the working.

 

[2informaticos]

Must have broken trace...

 

[briancomputerdoctor]

What do you think I could do?

Anything I can do to confirm the problem?

 

[2informaticos]

Try to identify the corresponding traces.
The working board can help you.

You may need to change the USB-C board.
Should practice in scrap board first...

 

[briancomputerdoctor]

Try to identify the corresponding traces.
The working board can help you.

Can you explain this in detail, please.

 

[2informaticos]

Find corresponding trace, or test points on the MLB.

 

[briancomputerdoctor]

You may need to change the USB-C board.
Should practice in scrap board first...

I saw a video where Louis said that this was very complex. I don't think this is a solution at the moment. Also, I want to be sure that this is absolutely necessary.

 

[briancomputerdoctor]

Find corresponding trace, or test points on the MLB.

Sorry. I am still learning. Can I use FlexBV to find a trace and, if so, what can I determine with this?

 

[2informaticos]

Boardview and schematic don't show USB-C port terminals.
You must find corresponding points in the MLB, checking continuity from J3300 to USB-C terminals.
You will need good board to find the traces; the bad one doesn't have continuity.
If broken traces are not in MLB (or bad solders at J3300), then need to change the USB port...

 

[briancomputerdoctor]

At this point do you think there is any problem with the CD3215 chips?

 

[2informaticos]

You have broken trace for sure.
You must get the same readings on diode mode at USB-C terminals like good board.

 

[briancomputerdoctor]

To do that I take off the usbc plate from the opposite of CD3215 side?