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Connect an HDMI cable from the cable box’s HDMI OUT port to an HDMI IN port on the LG TV. Then press the Input (External Input) button on the LG remote and select the HDMI number you used. HDMI carries both picture and sound, so you don’t need a separate audio cable.
Step-by-step: connect the box with HDMI
- Find the ports. On the back or side of the LG TV, locate an open HDMI IN port and note its number (for example HDMI 2). On the cable box, find the HDMI OUT port. Check the labels printed beside the ports.
- Connect the cable. Plug one end of an HDMI cable into the box’s HDMI OUT and the other into the TV’s HDMI IN. Push both in firmly. If a cable came with your box, you can use it; you only need to buy one if you have none.
- Power on both devices. Turn on the TV and the cable box.
- Select the input. Press External Input or Input on the LG remote and choose the same HDMI number the cable is plugged into. Button names and remote layouts vary by model. LG’s support guidance says to connect the TV to the set-top box with an HDMI cable and enable the set-top box as an active external input source on the TV.
- Optional: name the input. Where your TV offers input naming, label it “Cable Box.” LG notes that an HDMI input you’ve named earlier may appear as “Set-top Box.”
The cable box counts as an external source. The TV’s built-in tuner won’t show its picture unless you select that input.
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LG’s own manual for the 55LF5700/65LF5700 puts it this way: “An HDMI cable carries both audio and video. You do not need to use any audio cables.” Port labels, menus and images can differ on your model, and LG warns that its guide’s content may not match yours.
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If the TV says “No Signal”
- Confirm the TV is on the HDMI input that matches the port you used.
- Check that the HDMI cable is firmly seated at both the TV and the box.
- Power-cycle the box: unplug its power cord, wait a moment, plug it back in and let it restart. LG recommends this if the problem remains.
- If there’s still no signal, the cause may be service or activation on your provider’s side. Contact your cable provider; activation steps differ by provider and aren’t covered here.
What if the box or TV has no HDMI?
HDMI is the first choice when both devices have it. Other connections exist on some equipment, but they depend on the exact models, so check both devices’ manuals for matching ports. Don’t assume a passive adapter will fix an incompatible connection.
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| Connection | Use and limits |
|---|---|
| HDMI | Rated “best” in the LG 55LF5700/65LF5700 manual. Carries audio and video. |
| Composite AV | Rated “good” in the same manual. Needs matching color-coded ports on both devices. |
| Coaxial | Also rated “good” in that manual. Availability and setup are model-specific. |
| Component video | Listed in LG’s general connection guide. Depends on the ports your devices have. |
The ratings come from an older manual for those LG models, so treat them as model-specific. Picture quality and resolution will vary with your equipment.
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