Exact model-family answer directory
LG B4 OLED TV troubleshooting
LG B4 OLED TV (OLED48/55/65/77/83B4*): what the B4 is; the 120 Hz ceiling; flicker and VRR; input and cables; the B4 in the 2024 range; four HDMI ports, one with eARC, and a fix for each symptom below.
- What the B4 isThe LG OLED B4 is LG's 2024 entry OLED with traditional OLED, no evo brightness boost or MLA, and the Alpha 8 AI processor. It is the dimmest 2024 LG OLED but still perfectly black and self-emissive, so complaints are about gradation and processing.
Confirm the model first
Which units this covers, and how to tell yours is one of them
- Model numbers and patterns
- OLED48/55/65/77/83B4*
Published specification
What is true of this model and changes how you fix it
- Panel2024 entry OLED (traditional OLED, no evo brightness boost or MLA) with the Alpha 8 AI Processor — LG's dimmest 2024 OLED, but still perfect-black and self-emissive, so picture complaints are gradation/processing, not backlight clouding.
- Smart platformwebOS 24 with the Magic Remote — same app store, update path (Settings › Support › Software Update) and AirPlay 2 / Miracast screen share as the C4/G4.
- Gaming / HDMIFour HDMI 2.1 ports with 4K 120 Hz, VRR, ALLM, G-Sync and FreeSync — but capped at 120 Hz, NOT the 144 Hz of the 2024 C4/G4. A PC limited to 120 Hz on a B4 is at the panel limit.
- The 120 Hz ceilingA PC limited to 120 hertz on a B4 is at the panel's limit, and not a setting to fix.
- Flicker and VRRVariable refresh rate can cause a faint flicker in dark scenes on OLEDs, because brightness changes slightly with the refresh rate. It is a known effect, not a defect.
- Input and cablesUse a certified ultra high-speed cable for 4K 120 hertz. A cable that is not up to it causes flicker, dropouts or a black screen.
- The B4 in the 2024 rangeThe B4 is the entry OLED of the 2024 line, with the same webOS and many of the same inputs as the dearer sets but a less bright panel and a simpler processor. In a bright room it will look dimmer than a C4 or G4, so a darker room or a lower viewing angle helps.
- Four HDMI ports, one with eARCPort HDMI 3 carries eARC for a soundbar, and the other ports serve consoles, a set-top box and a streamer. If a device is not recognized, move it to another port and check that its HDMI mode is set to the enhanced format in the settings.
- Everyday careUse the TV's built-in Pixel Refresh, avoid very bright static logos for hours and wipe the screen only with a dry microfibre cloth. Do not press on the panel to remove a mark, since the surface is delicate.
Where these figures were read. lg.com/us/tvs/lg-oled65b4pua-oled-4k-tv.com OLED B4 product page + What Hi-Fi B4-vs-C4 (α8, 120Hz max, 4×HDMI 2.1)
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 B4 OLED TV
Does the LG B4 support 144Hz like the C4?+
No. The 2024 B4 maxes at 120 Hz. It gained four full HDMI 2.1 ports with VRR, ALLM, G-Sync and FreeSync that year, matching the C4 on port count, but 144 Hz is reserved for the C4, G4 and M4. 120 Hz on a B4 is the real ceiling, not a setting to fix.
Does the LG B4 support 144 Hz like the C4?+
No, it maxes at 120 Hz.
Why does my screen flicker in dark scenes?+
VRR on an OLED can do this.
How many HDMI 2.1 ports?+
Four.
Where is the model number?+
On the back and in TV Information.