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UNSUPPORTED MODE

LG TV & Audio · OLED65C4PUA 65" Class C4 4K OLED evo Smart TV

LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV UNSUPPORTED MODE Error Fix: Unsupported Resolution/Refresh Rate

The TV displays "Unsupported Mode" — the input signal has a resolution, refresh rate, or color space the TV cannot process. Change the output resolution on the source device. Enable "HDMI Deep Color" or "HDMI Ultra HD Deep Color" in Settings → General → Devices → HDMI Settings to support 4K@60Hz or 4K@120Hz.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error UNSUPPORTED MODE on the LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV means: Unsupported Resolution/Refresh Rate. The top-ranked community fix is “Update Source Device Firmware and Replace HDMI Cable” (medium difficulty, ~30 min, DIY cost: $10-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · tv

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many tv repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $120-$180.

Other LG TV & Audio Models with Error UNSUPPORTED MODE

55UQ7570PUJ 55" Class UQ75 Series 4K UHD Smart TV

tv · 2 fixes

75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV

tv · 2 fixes

86QNED80URA 86" Class QNED80 4K QNED MiniLED Smart TV

tv · 2 fixes

OLED55B3PUA 55" Class B3 4K OLED Smart TV

tv · 2 fixes

OLED65C3PUA 65" Class C3 4K OLED evo Smart TV

tv · 2 fixes

OLED65G3PUA 65" Class G3 4K OLED evo Gallery Edition Smart TV

tv · 2 fixes

Other LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV Error Codes

ABNORMAL TEMP

OLED Panel Over-Temperature

2 fixes

APP CRASH

App Freezes or Crashes

2 fixes

AUDIO SYNC

Audio Out of Sync with Video

2 fixes

BANDING

Horizontal or Vertical Banding

2 fixes

BLINK 2X

Power Supply Overcurrent / Short

Main Board Failure

Inverter / Backlight Driver Failure

2 fixes

BLINK 6X

T-CON Board Communication Error

2 fixes

People Also Ask About LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV Error UNSUPPORTED MODE

What does error code UNSUPPORTED MODE mean on a LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV?

Error code UNSUPPORTED MODE on the LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV means: Unsupported Resolution/Refresh Rate. The TV displays "Unsupported Mode" — the input signal has a resolution, refresh rate, or color space the TV cannot process. Change the output resolution on the source device. Enable "HDMI Deep Color" or "HDMI Ultra HD Deep Color" in Settings → General → Devices → HDMI Settings to support 4K@60Hz or 4K@120Hz.

How do I fix error code UNSUPPORTED MODE on my LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV?

The most successful fix is "Update Source Device Firmware and Replace HDMI Cable" (medium difficulty, ~30 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code UNSUPPORTED MODE on a LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV error UNSUPPORTED MODE myself?

Yes — the top-ranked community fix ("Update Source Device Firmware and Replace HDMI Cable") is rated medium difficulty and takes about 30 minutes. Tools needed: Internet-connected device, Cable tester (optional).

How much does it cost to repair LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV error UNSUPPORTED MODE?

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV have?

The LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV has 8 other known error codes, including: ABNORMAL TEMP (OLED Panel Over-Temperature), APP CRASH (App Freezes or Crashes), AUDIO SYNC (Audio Out of Sync with Video), BANDING (Horizontal or Vertical Banding), BLINK 2X (Power Supply Overcurrent / Short), and 3 more.

Which other LG TV & Audio models have the UNSUPPORTED MODE error?

Error code UNSUPPORTED MODE also appears on 6 other LG TV & Audio models: 55UQ7570PUJ 55" Class UQ75 Series 4K UHD Smart TV, 75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV, 86QNED80URA 86" Class QNED80 4K QNED MiniLED Smart TV, OLED55B3PUA 55" Class B3 4K OLED Smart TV, OLED65C3PUA 65" Class C3 4K OLED evo Smart TV, OLED65G3PUA 65" Class G3 4K OLED evo Gallery Edition Smart TV. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV have?

The LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV has 8 other known error codes:

ABNORMAL TEMP — OLED Panel Over-Temperature (2 fixes)
APP CRASH — App Freezes or Crashes (2 fixes)
AUDIO SYNC — Audio Out of Sync with Video (2 fixes)
BANDING — Horizontal or Vertical Banding (2 fixes)
BLINK 2X — Power Supply Overcurrent / Short (2 fixes)
BLINK 3X — Main Board Failure (2 fixes)
BLINK 4X — Inverter / Backlight Driver Failure (2 fixes)
BLINK 6X — T-CON Board Communication Error (2 fixes)

Which other LG TV & Audio models have the UNSUPPORTED MODE error?

Error code UNSUPPORTED MODE also appears on 6 other LG TV & Audio models:

55UQ7570PUJ 55" Class UQ75 Series 4K UHD Smart TV (tv) · 2 fixes
75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV (tv) · 2 fixes
86QNED80URA 86" Class QNED80 4K QNED MiniLED Smart TV (tv) · 2 fixes
OLED55B3PUA 55" Class B3 4K OLED Smart TV (tv) · 2 fixes
OLED65C3PUA 65" Class C3 4K OLED evo Smart TV (tv) · 2 fixes
OLED65G3PUA 65" Class G3 4K OLED evo Gallery Edition Smart TV (tv) · 2 fixes

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