The LNB (Low Noise Block downconverter) is the small unit suspended at the dish's focal point. It does two delicate jobs: it amplifies the extremely weak signal the dish collects, and it downconverts it from Ku-band microwave frequencies to an intermediate frequency the decoder can read through ordinary RG6 cable. It is the most sensitive piece of electronics in the whole chain — and it lives outdoors, in Durban weather.
The type matters as much as the condition:
- DStv Smart LNB — the current standard, required for Explora decoders and modern XtraView installations. One unit feeds multiple tuners correctly.
- Universal LNB (single output) — correct for a single older HD decoder; available in Twin and Quad variants for legacy multi-decoder setups.
Fitting the wrong type is worse than fitting a broken one, because it mostly works: an Explora on an old Universal LNB will show intermittent missing channels and recording clashes that are misery to trace. When we quote an LNB replacement we first establish what your decoders actually need — if your existing unit is the right type and healthy, we tell you so and leave it alone.
An LNB handles horizontal and vertical polarisation and low/high frequency bands on command from the decoder; a failure in any one of those four states produces the classic "some channels work, some don't" pattern. That pattern is diagnostic gold — it tells us it's the LNB before the ladder comes off the van.
Brands we fit and service
The lnb (smart & universal) market splits into hardware built for South African conditions and lookalikes that fail at the first hard season. These are the manufacturers we trust on Durban installations:
- DStv Smart LNB (official)
- Inverto
- Ellies
- Space Television
- GT-Sat
- Strong
- Televes
Official DStv hardware information: dstv.com · installer accreditation via MultiChoice.
When the lnb (smart & universal) goes wrong
These are the failures we're called to most often — each with its symptoms, causes and our fix on the dedicated problems page:
- Water ingressE48-32 — Signal loss or heavy pixelation during and after rain that doesn't fully recover in dry weather; corrosion visible at th…
- Polarisation or band-switching failure — A consistent set of channels missing while others work perfectly; whole bouquets unavailable; signal quality fine on the…
- Heat drift — Picture breaks up on hot afternoons and recovers in the cool of evening — maddeningly intermittent, always weather-corre…
- One output dead (Twin/Quad/Smart LNB) — One decoder (or one XtraView room) has no signal while the other works perfectly from the same dish.
- Lightning damageE48-32 — Total signal loss immediately after an electrical storm, often alongside decoder damage.
- Incorrect LNB type for the decoder — Intermittent missing channels on an Explora, XtraView pairs falling out of sync, recordings failing while live TV works.
Need this fixed or installed?
Our DStv LNB Replacement service covers lnb (smart & universal) work across Durban and surrounding areas — from R350, quoted upfront and backed by our 6-month workmanship warranty.