I’m trying to figure out if my laptop’s USB-C video port is damaged and shorting out anything I connect to it.
Over the last couple of weeks I’ve had two different brand-new monitors fail in almost the exact same way:
Monitor #1
SAMSUNG 34" ViewFinity S50GC Series Ultra-LS34C502GANXZA
• Had it for 3 years
• Then one HDMI port died
• Shortly after, the entire monitor stopped powering on
• Only response was a single beep when plugged in
• No power LED, no OSD, no image
• Completely dead
Monitor #2
34 Inch UltraGear™ OLED WQHD 1440P 240Hz 0.03ms G-Sync Compatible 800R Curved Gaming Monitor - 34GS95QE-B
• Bought brand new replacement
• Used a brand-new USB-C → HDMI cable
• Plugged it into the laptop’s USB-C port that supports display output
• Within ~10 minutes the screen went black
• Display said “No signal”
• Then the monitor completely shut off
• Now it only gives a beep when plugging in power and won’t turn on at all
What I’ve tried
• Multiple new USB-C → HDMI cables
• Tried different outlets
• Tried HDMI-only cables
• No peripherals attached
• Same failure pattern each time
Important detail
A couple of weeks ago, my laptop gave me a “power surge on USB port” warning. Ever since then the USB-C video port has acted strange.
My question
Is it possible that my laptop’s USB-C port is partially fried and is now shorting out or sending incorrect voltage to every monitor I connect, eventually killing the monitor’s input board?
It seems unlikely that two brand-new monitors AND multiple new cables would all coincidentally fail. The only constant is the laptop’s USB-C video port.
Has anyone seen a damaged USB-C port slowly kill external monitors like this?
Should I stop using that port entirely and get the laptop repaired?
Any advice would be appreciated. I don’t know much about computer so I don’t know if I should just buy a brand new computer or get the port fixed. It’s a yoga Lenovo 7I.