Samsung QN90C — Error codes & fixes
Troubleshooting guide for the Samsung QN90C. Diagnose an error code and find the fix.
No sound
no-soundThe soundbar powers on but produces no audio, often from a wrong input, a loose HDMI connection or a muted source.
Source: ProductDB enrichment catalog
Confidence: 85%
Verified Aug 8, 2026
System update failed
update-failedThe NAS cannot complete a DSM/OS update, often from a network issue or low storage.
Source: ProductDB enrichment catalog
Confidence: 85%
Verified Aug 8, 2026
Remote control not working
remote-not-workingThe soundbar remote does not respond, often due to dead batteries or a pairing issue.
Source: Samsung TV support — no signal / HDMI
Confidence: 80%
Verified Aug 9, 2026
Screen flickering
screen-flickerThe screen flickers, often due to a refresh rate issue, a loose cable, or a failing panel.
Source: Samsung TV support — no signal / HDMI
Confidence: 80%
Verified Aug 9, 2026
Smart apps not loading
no-appsThe smart TV apps fail to load, often due to a network issue or a software glitch.
Source: Samsung TV support — no signal / HDMI
Confidence: 80%
Verified Aug 9, 2026
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