This antenna signal flex cable is a direct replacement for the Samsung Galaxy S21 5G SM‑G991U, intended for routine repairs that target connectivity issues such as weak reception or intermittent calls.
Use case: replace a damaged or worn antenna flex when troubleshooting signal loss after drops, water exposure, or disassembly. Suited for at‑home repairers and repair shops that perform board‑level replacements and want to avoid replacing the entire handset.
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Direct fit: Designed to match OEM mounting points and connector layout for SM‑G991U.
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Function: Restores antenna pathway for cellular and roaming signal transmission.
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Material: Flexible printed circuit with black polymer coating for routing inside the chassis.
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Compatibility: Compatible only with Samsung Galaxy S21 5G SM‑G991U model — avoid other S21 variants.
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Installation: Intended for professional or experienced technicians; small screws and adhesive may be required.
Specifications (light): flex cable length ~45 mm, connector type ribbon, color black.
Fit statement: Fits Samsung Galaxy S21 5G SM‑G991U only; verify model number before purchase.
