Model-Specific Fixes for Samsung TV “No Signal” Errors

1. Older LCD/Plasma (LA/LE/PS, circa 2008–2013)

Typical models: LA32B, LE40C, PS51D

1. Use the TV button to select the correct source (TV / AV / HDMI1 / HDMI2).

2. For antenna use (RF/coax), set Source = TV, then enter channel 3 or 4 if using a decoder RF output.

3. Run Auto Tuning / Auto Program from the Broadcasting menu to find channels.

4. For HDMI:

   • Turn OFF decoder/DVD + TV, unplug HDMI both ends, reconnect firmly, then power decoder first, TV second.

   • Test each HDMI port; some older sets lose one port while others still work.

If another TV works fine on the same cable/decoder, your Samsung’s HDMI or tuner board may be faulty.

2. Mid-Range LED “UN / UE / UA / H–J–K” Series (2013–2017)

Typical models: UN40H, UE48J, UA55K

1. For coax from antenna/cable:

   • Select Source = TV, confirm the RF cable is tight, then try a different wall outlet or splitter if signal is weak.

   • Test the same antenna/cable with another TV to rule out signal issues.

2. For HDMI devices (DSTV, PS4, laptops):

   • Confirm the device is ON and not in standby.

   • Select the exact HDMI input: e.g. HDMI1/DVI vs HDMI2 (use SOURCE button until you see the correct one).

   • Try a different HDMI cable and port. If HDMI 1 fails but HDMI 2 works, the port hardware is likely bad.

3. Update firmware via USB (Support > Software Update) if HDMI no-signal started after a power outage.

3. Smart TV “M–R Series” (2015–2018 FHD/UHD)

Typical models: UA40M, UN49MU, NU7100

1. Go to Settings > Support > Self Diagnosis > Signal Information (or Signal Test) to see if the TV is detecting anything on that input.

2. For HDMI:

   • Disable then re‑enable HDMI-CEC / Anynet+ under External Device Manager.

   • Remove all devices, connect only one (e.g. decoder) directly to HDMI1 with a known‑good cable, bypassing soundbars, splitters, or wall plates.

3. For antenna: run Auto Tuning, and if still “Weak or No Signal”, test the antenna on another TV; if both fail, the issue is in the signal, not the TV.

4. QLED & High-End “Q / QN” Series (2017+)

Typical models: Q60, Q70, Q80, QN90A/C

1. Use Home > Source > Device Manager (or Connection Guide) and let the TV auto‑detect HDMI devices like consoles or decoders.

2. If 4K devices show “No Signal”:

   • Set the HDMI port to Enhanced / UHD Color in settings, and ensure your HDMI cable is High-Speed or 2.0/2.1 certified.

   • Lower the source output from 4K 60Hz HDR to 1080p 60Hz to see if the signal appears; if yes, the cable/port cannot handle the full bandwidth.

3. Soft‑reset the TV: hold the power button on the remote for ~10 seconds until the logo appears, then release.

5. Crystal UHD & Recent Smart TVs (TU/BU/CU/DU, 2019+)

Typical models: TU7000, AU8000, BU8100, CU8000

1. Run the HDMI Troubleshooting wizard: Settings > Support > Device Care > Self Diagnosis > HDMI Troubleshooting (name may vary).

2. For set‑top boxes and streaming sticks:

   • Plug device directly into TV (no adapter/extender).

   • Turn TV and device off at the wall for 1–2 minutes, then power device first, TV second.

3. If only one HDMI port shows “No Signal” with every device while others work, that specific port is likely damaged and needs board repair or replacement.

6. General Tests for Any Model

• Try a different device (laptop, DVD, console) on the same HDMI input to see if the issue is the TV or the original device.

• Try the same device + cable on another TV/monitor; if “No Signal” follows the device, the problem is not your Samsung TV.

• If you use RF/antenna, always confirm a working broadcast or decoder on that same line first.

If you tell me your exact model (e.g. UA40H5000, QN55Q60A, BU8000) and how you connect (HDMI, decoder, antenna), I can give you model‑specific menu paths and settings to try next.