Testing USB-C Switch Connections

Thought for 1 min 16 sec

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?

summerexe

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

Thought for 1 min 45 sec

flux

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

Capacitance

22uF

U2 Vin - U1 5V

U1 3V3 - J1 Pin_7

U3 SD - U1 GPIO42

U2 Vin - U1 5V

SW1 P3 - U1 5V

U1 3V3 - J1 Pin_7

Capacitance

22uF

U1 GPIO41 - U2 LRC

J4 Pin_1 - U1 GPIO2

U2 Vin - U1 5V

U4 I/O - U1 GPIO14

U3 GND - U4 GND

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Project Name

Jiji v3

Description

ESP32-S3 CAM Audio-Visual Controller with I2S MEMS Microphone, Class-D Amplifier, SPI Display, Servos, Capacitive Touch and Integrated USB-C Power-Only Sink (VBUS via J6 -> 5V_IN -> SW1:P1 -> 5V_SW, CC1/CC2 5.1 kOhm to GND, VBUS TVS Surge Protection) + Added optional bulk electrolytic caps on 5V_SW near servo headers

Properties

System Architecture

Diagram

Pricing & Availability

Distributor	Qty 1

Controls

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summerexe / Jiji v3

Schematic