briancomputerdoctor
Member
Diode mode to ground
C7023 is showing 0.520
C7020 is showing 0.397
C7023 is showing 0.520
C7020 is showing 0.397
-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
A1708 820-00840-A 5V 400ma
- Thread starter briancomputerdoctor
- Start date
briancomputerdoctor
Member
Diode mode to ground
C7030 is showing 0.380
C7030 is showing 0.380
briancomputerdoctor
Member
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
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
Member
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
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
briancomputerdoctor
Member
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
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
Attachments
Do you have similar board for comparison?
briancomputerdoctor
Member
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.
Must have broken trace...
briancomputerdoctor
Member
What do you think I could do?
Anything I can do to confirm the problem?
Anything I can do to confirm the problem?
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...
The working board can help you.
You may need to change the USB-C board.
Should practice in scrap board first...
briancomputerdoctor
Member
Find corresponding trace, or test points on the MLB.
briancomputerdoctor
Member
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
Member
Sorry. I am still learning. Can I use FlexBV to find a trace and, if so, what can I determine with this?
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...
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...
Last edited:
briancomputerdoctor
Member
At this point do you think there is any problem with the CD3215 chips?
You have broken trace for sure.
You must get the same readings on diode mode at USB-C terminals like good board.
You must get the same readings on diode mode at USB-C terminals like good board.
briancomputerdoctor
Member
To do that I take off the usbc plate from the opposite of CD3215 side?