An owner of a 65C845 reports the bass response collapsed after updating to V8-0012T01-LF1V509.002303, and a warranty replacement unit showed the same problem, pointing to the firmware rather than the hardware.
What to check. Before buying, be aware a widely-reported firmware version (V509) is tied to a degraded bass/subwoofer output that survives a hardware swap. Check the installed firmware version and consider whether a downgrade is possible before accepting the unit.
Mini-LED backlight zone driver failure causes dark patches / sound but no picture
A component-level repair shop lists the C845 among models where the Mini-LED zone drivers or LED strips give up, causing dark zones, uneven backlight/blooming, or 'sound but no picture'.
What to check. This is a hardware failure mode specific to the Mini-LED backlight array: zones can go fully dark or the backlight can fail while audio continues. It is a panel-level repair, likely expensive and outside warranty.
Whole TV locks up and becomes unresponsive, needing a wall power cycle
Owners report the C845 randomly locks up solid and becomes unresponsive, requiring a power pull at the wall; one owner can reproduce it consistently via the Kodi app, and it persists after firmware updates.
What to check. Expect occasional full-system freezes that require unplugging the TV. This is a software/UI reliability issue, not a panel defect, and it did not go away with updates.
Firmware V617 corrupted AV receiver settings via the eARC port
A user reports firmware V8-T615T03-LF1V617.000879 corrupted AV-receiver settings through the eARC port, changing the receiver's HDMI input and causing 'Access Error' on the receiver's internet radio.
What to check. If you rely on eARC to a soundbar or AV receiver, a firmware update can change/corrupt the receiver's input settings. Verify eARC behavior after any update and be ready to re-set the receiver input.
Google TV stuck on boot logo after interrupted update / eMMC wear
The repairer attributes boot-logo hangs on the C-series to corrupted eMMC storage or broken Play Services after an interrupted update, matching owner reports of boot loops on the 2023 TCL Google TV platform.
What to check. An interrupted or failed firmware update can leave the TV stuck on the boot logo. Recovery usually needs a factory reset via recovery mode or a USB IMG reflash, which is not a simple user fix.
HDMI input locked at 720p, fixed only by a hidden service-menu factory reset
An owner's C845 HDMI input locked at 720p and could only be cleared by a factory reset through the hidden service menu; the same owner also reports Dolby Vision at 4K/60Hz not working via Chromecast.
What to check. HDMI handshake faults (resolution lock, Dolby Vision at 4K/60Hz not passing) are reported. A hidden service-menu factory reset is the reported fix, which is not a normal user procedure.
Panel defects in TR market: clouding, black spots, and flickering on moving scenes
Turkish consumer complaints (Şikayetvar) on the 65C845 report image flickering/waving on moving scenes, black spots and darkening appearing within days, and clouding on one side of the panel; one case led to a replacement approval.
What to check. In the Turkish market, panel-uniformity and moving-image artifacts are reported on the 65C845, some within the first days of ownership. These are panel-level issues that typically require service inspection or replacement.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Televisions catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
