Switch oled USB C port replaced. Charging works both ways but doesn’t dock.

dangbawu · Mar 11, 2025

When docked the green light pops up on the dock but doesn’t port to tv. I tried with another switch and the dock works. Any ideas? Charging works both ways so I’m assuming everything was soldered properly. I tried measuring the p13 for faults but didn’t find no shorts or problems with the filters.

This board before the replacement would kill devices, I.e portable monitor plugged in? Dead. Dock plugged in? Dead.

So I’m assuming a power surge happened somewhere in the ports. Any ideas given the context of how to fix?

jkyoho · Mar 11, 2025

check if all pins from port goes through where they should. i.e A11.A10 OR B2,B3 to pi3usb choke filters

dangbawu · Mar 11, 2025

jkyoho said:
check if all pins from port goes through where they should. i.e A11.A10 OR B2,B3 to pi3usb choke filters

Ok I don’t have one of those usb c output checkers. If I don’t have one would I still be able to check?

l7777 · Mar 11, 2025

dangbawu said:
Ok I don’t have one of those usb c output checkers. If I don’t have one would I still be able to check?

If you want to check, you need one. You need to verify that connections go through the port to the respective locations to try to locate the issue.

dangbawu · Mar 14, 2025

jkyoho said:
check if all pins from port goes through where they should. i.e A11.A10 OR B2,B3 to pi3usb choke filters

So I just did a check in continuity mode and they’re all good according to the schematic. Anything else to check for?

jkyoho · Mar 14, 2025

dangbawu said:
So I just did a check in continuity mode and they’re all good according to the schematic. Anything else to check for?

With the breakout board like in the picture?

l7777 · Mar 14, 2025

dangbawu said:
So I just did a check in continuity mode and they’re all good according to the schematic. Anything else to check for?

Check the diode readings. Positive probe on a ground and negative to the points and record their values.

dangbawu · Mar 19, 2025

jkyoho said:
With the breakout board like in the picture?

Yep with the breakout board. It showed continuity to all point that you mentioned.

Post automatically merged: Mar 19, 2025

l7777 said:
Check the diode readings. Positive probe on a ground and negative to the points and record their values.

I checked and there is an ol on number 17/8 if flipped - all other points check out according to the video. Looks to be the choke filter on the back of the board. I’ll replace that piece off my donor and get back to you guys.

dangbawu · Mar 27, 2025

jkyoho said:
With the breakout board like in the picture?

So I replaced the choke, with one from a donor and it’s still OL on 17 and 8. Do you know what else I should do? There continuity from that point to the choke still

jkyoho · Mar 27, 2025

dangbawu said:
So I replaced the choke, with one from a donor and it’s still OL on 17 and 8. Do you know what else I should do? There continuity from that point to the choke still

you mean SBU1 and SBU2 pins on A8 and B8?

dangbawu · Mar 27, 2025

jkyoho said:
you mean SBU1 and SBU2 pins on A8 and B8?

Based your diagram a5 (17) is OL! I checked again and (b5) 8 isn’t OL.

Post automatically merged: Mar 27, 2025

dangbawu said:
Based your diagram a5 (17) is OL! I checked again and (b5) 8 isn’t OL.

Could it be the p13? There is continuity from a5 to the choke but OL. I replaced the choke already and same thing

jkyoho · Mar 27, 2025

A5/CC1 and B5/CC2 go to those 2 test pads and straight into m92t. Do you see them have beep on yellow test pads from your breakout board?

dangbawu · Mar 27, 2025

jkyoho said:
A5/CC1 and B5/CC2 go to those 2 test pads and straight into m92t. Do you see them have beep on yellow test pads from your breakout board?View attachment 493982

Oh then yes the pins that go into SUSB1 and SUB2 is my assumption. Sorry these letters are confusing me a little.

Post automatically merged: Mar 27, 2025

jkyoho said:
A5/CC1 and B5/CC2 go to those 2 test pads and straight into m92t. Do you see them have beep on yellow test pads from your breakout board?View attachment 493982

From the diagram I have 17 OL other readings are consistent with the video

jkyoho · Mar 27, 2025

OK,. so SBU1 and SBU2 you need to check the choke filter in orange from my picture
It should be same filter from the video

dangbawu · Mar 27, 2025

jkyoho said:
OK,. so SBU1 and SBU2 you need to check the choke filter in orange from my picture
It should be same filter from the video

I replaced that choke and it still is OL, unfortunately do you know what else?

jkyoho · Mar 27, 2025

Do you have diode reading on the choke?

dangbawu · Mar 27, 2025

jkyoho said:
Do you have diode reading on the choke?

How would I check them? Red on ground and black on every pin of the choke?

jkyoho · Mar 27, 2025

yes you should have around 0.7v

dangbawu · Mar 28, 2025

jkyoho said:
yes you should have around 0.7v

The left side (usb c south facing) of the filters are OL, the right ones read .7

l7777 · Mar 28, 2025

dangbawu said:
The left side (usb c south facing) of the filters are OL, the right ones read .7

Sounds like you're getting closer to the problem, if there it is OL from the USB facing side and .7 on the other your problem should be between the choke and the port. Measure resistance between the port and each test thing you can find until you get to the choke. There is a break somewhere. The XZZ boardview should help with tracing it out.

Switch oled USB C port replaced. Charging works both ways but doesn’t dock.

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