Testing USB-C Switch Connections

flux

1:16

Analyzing user questions.

Following tool usage rules.

Verifying switch connections.

Proposing multimeter tests.

Accessing knowledge base.

Analyzing the schematic.

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).
  1. 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).
  1. 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?
69 days
summerexe

summerexe

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

flux

1:45

Reviewing power board checks.

Validating connection measurements.

Connecting and measuring components.

Simplifying the instructions.

Accessing knowledge base.

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
69 days
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    Jiji v3

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    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

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"J6 VBUS"
"5V_IN"
"J6 VBUS__1"
"SW1:P1"
"5V_SW"
"Existing node_5V consumers"
"J6 CC1"
"R_CC1 5.1k"
"J6 CC2"
"R_CC2 5.1k"
"GND"
"VBUS TVS diode"

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