Signal Cable for LG K40S

The Signal Cable on your LG K40S is the cable that carries RF signals between the antenna elements and the motherboard's RF processing circuit. It may be a coaxial cable — with a shielded round construction — or a flat signal flex depending on the LG K40S's specific architecture. The Coaxial Cable listing refers specifically to a shielded round RF cable, while the Signal Cable listing covers the specific RF interconnect cable for your model regardless of its physical construction format.

If signal issues developed after a repair that involved opening the phone and routing or repositioning internal cables — particularly in the area between the antenna and the motherboard RF section — the Signal Cable is the first component to inspect for kinking, crushing, or connector damage on your LG K40S. Gradual signal deterioration after a drop also points to Signal Cable damage.

Yes. The cable type, impedance, length, connector specification, and routing are model-specific. This listing is designed for LG K40S only. An incorrect cable will not provide the correct impedance match for your device's RF circuit — causing signal degradation even if it physically connects.

It is a moderate repair requiring the phone to be opened and the cable carefully routed and connected at both ends. No soldering is required in most cases. Care is needed to avoid kinking or crushing the cable during reassembly on your LG K40S.

Yes — a 7-day replacement warranty covering manufacturing defects is included. An unboxing video is mandatory for all warranty claims. Cables showing physical damage from improper installation are not covered under warranty. For more information, check out SAHII's Return Policy.