Testing USB-C Switch Connections

1:16

Project

Schematic

Analyzing user questions.

Following tool usage rules.

Verifying switch connections.

Proposing multimeter tests.

Using Knowledge Base Tool.

Using Schematic Tool.

Confirming multimeter testing steps.

Yes—your switch not being tied to GND is correct for how you wired it. In your schematic, the switch is in series on the 5 V rail:

J6 VBUS (“Net 3”) enters SW1 on pin 2.
The switched 5 V rail (“5V_SW”) leaves SW1 on pin 3 and goes to your loads and bulk caps.
GND is only used by the USB-C CC pull-downs: R1 and R2 are 5.1 kΩ to GND for CC1/CC2, which is also correct.

Quick multimeter checks

Do these with power disconnected first (continuity/ohms), then with power applied (voltage).

Unpowered continuity/ohms

CC resistors:
- Measure between J6 CC1 pad and GND: ≈ 5.1 kΩ (through R1).
- Measure between J6 CC2 pad and GND: ≈ 5.1 kΩ (through R2).
VBUS A/B tie:
- Measure between J6 VBUS_A and VBUS_B pads: ~0 Ω (they’re shorted together on “Net 3”).
Switch continuity:
- Probe SW1 pin 2 to pin 3.
- In the ON position: ~0 Ω (closed). In the OFF position: open (infinite).
- If unsure which position is ON, flip it and watch the reading change.
Short check:
- Measure between 5V_SW (e.g., the positive pad of C1 or Pin 2 of J3/J4) and GND: should NOT be a short (expect high resistance).

Powered voltage checks (use a current-limited USB supply if possible)

Plug in a USB-C source.
- J6 VBUS (either A or B VBUS pad) to GND: about 5.0 V.
With switch OFF:
- 5V_SW (e.g., C1 positive, or J3/J4 Pin 2) to GND: ~0 V (may float slightly).
With switch ON:
- 5V_SW to GND: about 5.0 V.

If any reading deviates:

No 5 V on J6 VBUS with cable plugged: recheck soldering on the USB-C VBUS pins and the CC pull-downs (R1, R2).
5V_SW never gets to 5 V: verify SW1 pin 2 is truly on J6 VBUS (“Net 3”) and pin 3 is on “5V_SW”, and confirm switch continuity in the ON position.
Any short to GND: inspect for solder bridges on J6 VBUS/CC/GND pins and the switch pins.

Want me to mark a few easy probe points on your schematic for these measurements?

17 days

summerexe

with the power on, how to check is sw1 is getting power

17 days

flux

1:45

Chat History

Project

Reviewing power board checks.

Validating connection measurements.

Connecting and measuring components.

Simplifying the instructions.

Using Knowledge Base Tool.

Creating concise steps for checking SW1.

Here’s the quickest way to verify SW1 is receiving power (with the board powered):

Set DMM to DC volts. Put the black probe on a ground pad of J6 (GND_A/B).
Check USB 5 V is present: red probe on J6 VBUS pad to ground. Expect about 5.0 V.
Check SW1 input (pin 2): red probe on SW1 pin 2 to ground. Expect about 5.0 V if the switch is getting power from VBUS.

To confirm SW1 is passing power:

Switch OFF: red probe on SW1 pin 3 (output) or the 5V_SW rail (e.g., positive pad of C1) to ground should read ~0 V.
Switch ON: the same point should read about 5.0 V.
Optional: measure between SW1 pin 2 and pin 3 directly when ON; the drop should be ~0 V.

If SW1 pin 2 is not ~5 V but J6 VBUS is, recheck solder on SW1 and the trace from J6 to SW1:2. If 5V_SW is 5 V even when OFF, look for a solder bridge shorting SW1:2 to SW1:3.

Probe SW1 pin 2

Check SW1 output rail

Verify connector power

Multimeter test points

17 days

Ready.

INMP441 MEMS

ESP-32 S3 Cam module aHTs

MAX98357 Breakout

Capacitance

22u F

U2 Vin - U1 5V

U1 GPIO41 - U2 LRC

U3 GND - U4 GND

J6 CC1 - R1 1

U1 3V3 - J1 Pin_7

U3 SD - U1 GPIO42

U3 GND - U4 GND

U1 3V3 - J1 Pin_7

J6 CC1 - R1 1

J6 CC2 - R2 1

Capacitance

22u F

U1 GPIO40 - U2 BCLK

J1 Pin_6 - U1 GPIO19

U3 SD - U1 GPIO42

J6 V-BUS__1 - SW1 2

Capacitance

22u F

J1 Pin_2 - U1 GPIO45

U2 Vin - U1 5V

J3 Pin_1 - U1 GPIO1

U3 GND - U4 GND

J1 Pin_5 - U1 GPIO20

J3 Pin_1 - U1 GPIO1

SW1 P3 - U1 5V

J1 Pin_4 - U1 GPIO21

Capacitance

22u F

U1 3V3 - J1 Pin_7

U2 Vin - U1 5V

U1 GPIO39 - U2 DIN

J1 Pin_4 - U1 GPIO21

J1 Pin_2 - U1 GPIO45

Capacitance

22u F

U3 GND - U4 GND

J1 Pin_3 - U1 GPIO47

J1 Pin_6 - U1 GPIO19

J1 Pin_5 - U1 GPIO20

U1 GPIO41 - U2 LRC

J4 Pin_1 - U1 GPIO2

U1 GPIO41 - U2 LRC

J6 V-BUS__1 - SW1 2

U1 GPIO39 - U2 DIN

U3 GND - U4 GND

U2 Vin - U1 5V

GND

J4 Pin_1 - U1 GPIO2

J1 Pin_3 - U1 GPIO47

GND

U2 Vin - U1 5V

U4 I/O - U1 GPIO14

U1 GPIO40 - U2 BCLK

U4 I/O - U1 GPIO14

U1 GPIO40 - U2 BCLK

J6 CC2 - R2 1

SW1

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Inspect

Jiji v3

Controls

Properties

System Architecture

```mermaid flowchart TD J6_VBUS["J6 VBUS"] --> VBUS_IN["5V_IN"] J6_VBUS1["J6 VBUS__1"] --> VBUS_IN VBUS_IN --> SW1_P1["SW1:P1"] SW1_P1 --> V5_SW["5V_SW"] V5_SW --> Consumers["Existing 5V consumers"] CC1_PIN["J6 CC1"] --> R_CC1["R_CC1 5.1k"] CC2_PIN["J6 CC2"] --> R_CC2["R_CC2 5.1k"] R_CC1 --> GND["GND"] R_CC2 --> GND VBUS_IN --> TVS["VBUS TVS diode"] TVS --> GND ```

Availability & Pricing

Distributor		Qty 1
	Arrow	$0.09
	Digi-Key	$3.50
	LCSC	$3.58
	Mouser	$4.56
	TME	$5.60
	Verical	$3.78–$5.60

Assets

Group 903.svg

id=Group 903

DefaultThumbnail

summerxjiji.svg

id=summerxjiji

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