Exact model-family answer directory
LG B3 OLED TV troubleshooting
LG B3 OLED TV (OLED55/65/77B3*): what the B3 is; webOS 23; the HDMI port limit; eARC and the soundbar; which ports do what; updating, and a fix for each symptom below.
- What the B3 isThe LG OLED B3 is LG's 2023 entry OLED, with regular OLED glass and no evo brightness boost, so it is the dimmest 2023 LG OLED. It is still self-emissive with perfect blacks, so picture complaints are about gradation and processing, not a backlight.
Confirm the model first
Which units this covers, and how to tell yours is one of them
- Model numbers and patterns
- OLED55/65/77B3*
Published specification
What is true of this model and changes how you fix it
- Panel2023 entry OLED (regular OLED glass, no evo brightness boost) — the dimmest 2023 LG OLED. Still perfect-black and self-emissive, so picture complaints are gradation/processing, not backlight.
- Smart platformwebOS 23 with the Magic Remote — same app store, update path and AirPlay 2 / Miracast screen share as the C3/G3.
- Gaming / HDMI — IMPORTANT port limitUnlike the C3 and G3, only TWO of the B3's four HDMI ports are full HDMI 2.1 with 4K 120 Hz; the other two are HDMI 2.0. A console or PC that will not do 4K 120 Hz or VRR on a B3 is very often plugged into one of the two HDMI 2.0 ports — move it to a 2.1 port first.
- webOS 23It runs webOS 23 with the Magic Remote, with the same app store, update path and AirPlay 2 and Miracast screen sharing as the C3 and G3.
- The HDMI port limitUnlike the C3 and G3, only two of the B3's four HDMI ports are full HDMI 2.1 with 4K 120 hertz. The other two are HDMI 2.0, so a console or a PC that will not do 4K 120 hertz or VRR is very often in a 2.0 port.
- eARC and the soundbarOne of the HDMI ports is the eARC port, for a soundbar or an AV receiver. Using eARC takes a port that you might want for a console, so plan the ports.
- Which ports do whatThe port labels on the TV mark the eARC port and the 2.1 ports. A console on a 2.1 port, and a soundbar on the eARC port, is the usual arrangement.
- UpdatingSettings, Support, Software Update installs new software. A TV that has not been updated may have bugs in HDMI handling.
- Finding the modelThe label on the back and Settings, Support, TV Information show the model, such as OLED65B3PUA.
Where these figures were read. lg.com/us/tvs/lg-oled65b3pua-oled-4k-tv.com OLED B3 product page + FlatpanelsHD 2023 lineup (regular OLED, 2×HDMI 2.1 at 4K120)
Manufacturer support for this product line. LG Support — TV and home theater support. Official LG television manuals, webOS support, diagnostics and repair entry point.
Also read for this model. LG Support — LG TV support.
Exact questions
Questions that only have an answer for the LG B3 OLED TV
My PS5/Xbox won't do 4K 120Hz on my LG B3.+
Check which HDMI port it is in. On the B3, only two of the four HDMI ports are full 2.1 with 4K 120 Hz and VRR — the other two are HDMI 2.0 and cap out lower. This is different from the C3 and G3, where all four are 2.1. Move the console to one of the 4K-120-capable ports (they are labeled in the manual), use a 48 Gbps cable, and turn on Game Optimizer.
My PS5 or Xbox will not do 4K 120 Hz on my LG B3. Why?+
Only two of its four HDMI ports are 2.1.
Which port is eARC?+
It is labeled on the TV.
Is the B3 as bright as the C3?+
No, it is the dimmest of the three.
Where is the model number?+
On the back and in TV Information.