LG UBK90 4K Ultra-HD Blu-ray Player with Dolby Vision (2018) Review (2026)

Who still wants a 4K Blu-ray player

Physical disc playback has become a niche interest as streaming has taken over most casual viewing, but Blu-ray still delivers a level of picture and audio consistency that compressed streams cannot always match, which keeps players like the UBK90 relevant for film collectors and audio enthusiasts. LG designed this unit as a straightforward 4K disc player rather than a full home theater hub, and its simple menu system reflects that focus. It is a natural fit for someone building or maintaining a home theater around an LG OLED or LED TV who wants matching menus and remote behavior, or anyone who already owns a 4K Blu-ray disc library and wants Dolby Vision without paying for Sony's higher tier players.

Dolby Vision and playback support

The UBK90 plays 4K Ultra HD Blu-ray discs with support for both HDR10 and Dolby Vision, which was a standout feature for a mid-range player when it launched and remains genuinely useful today since Dolby Vision support still is not universal on budget players. LG's spec sheet also lists 4K upscaling for standard Blu-ray and DVD discs, so older discs get a resolution boost on a 4K display rather than playing at native, lower resolution. The player also handles 3D Blu-ray and DVD playback for anyone holding onto an older 3D disc collection, alongside region A Blu-ray and region 1 DVD compatibility for US format discs.

Streaming and connectivity

Built in dual band 802.11ac WiFi lets the UBK90 stream without an ethernet cable, and LG lists Netflix and YouTube with 4K upscaling among the supported apps, though the app selection is limited compared to a dedicated streaming stick or smart TV platform and should not be the main reason to buy this player. Two HDMI outputs are included, which is a notable convenience for home theater setups that separate audio and video signals, for example sending audio to an AV receiver over one HDMI cable while sending video directly to the TV over the other, avoiding potential handshake or lip sync issues some single-HDMI players run into.

Audio decoding and build

For audio, the UBK90 includes built in decoding for Dolby Digital and Dolby TrueHD, covering the lossy and lossless audio tracks found on most Blu-ray discs, so it can output a fully decoded signal to a receiver without relying on bitstream pass-through alone. LG lists the player's dimensions at roughly 16.9 inches wide, 1.8 inches high and 8.1 inches deep, a slim, TV-console friendly footprint that stacks easily under a TV or inside an AV cabinet. Build quality follows LG's typical mid-range player design, functional rather than premium, in line with its position below step up players from Sony and Panasonic.

What to weigh before buying

LG's own product page now lists the UBK90 as discontinued, which means no further firmware updates or app support beyond what is currently loaded, and buyers should expect to find it mainly through third party sellers or old stock rather than direct from LG. Compared to current Sony players such as the UBP-X700 series, the UBK90 offers fewer audio processing features and a smaller streaming app list, reflecting both its age and its position as a mid-range rather than flagship player when new. For someone who mainly wants reliable Dolby Vision disc playback on an LG-based system at a lower price than Sony's options, it remains a workable, if dated, choice.

Frequently asked questions