Solder paste plays a very important role in mobile phone motherboard repair. It is generally deposited on the pad by printing or dripping. After the components are mounted, they are positioned by the adhesion of the solder paste and soldered on the required pads through a reflow oven to complete the required electrical and mechanical connections.

When selecting solder paste for mobile phone motherboard repair, you need to consider the type of soldering, temperature range, and preference for lead-free or leaded solder.

  • 183°C (high temperature)
  • 158°C (medium temperature)
  • 138°C (lead-free)
  • 217°C (lead-free)

Flux type selection:

  1. Rosin (R): low activity, suitable for clean surfaces, leaving hard residues that can be removed by solvents.
  2. No-clean (NC): low to medium activity, leaving non-corrosive residues that can be left on the circuit board or removed with solvents.
  3. Mildly activated rosin (RMA): medium activity, suitable for slightly oxidized surfaces, will leave soft residues, and may require cleaning depending on the application.
  4. Rosin active (RA): Highly active, suitable for heavily oxidized surfaces, will leave corrosive residues that must be cleaned.
  5. Water soluble (WS): Highly active, excellent cleaning performance, but requires thorough cleaning to remove residues that may cause corrosion.

Below we will introduce several solder pastes in Phonefix stores

AMTECH NC-559 and RMA-223 Lead-Free Solder Flux are popular flux brands suitable for mobile phone repairs, which can achieve soldering and desoldering processes. It has excellent wetting properties and reduces the occurrence of soldering defects.



XZZ solder paste 138℃ 158℃ 183℃ 199℃ flux is suitable for mobile phone iPad tablet computer logic board PCB BGA SMD PGA soldering desoldering repair. XZZ low/medium/high temperature leaded/lead-free flux paste.

XZZ solder paste 138℃/158℃/183℃/199℃ temperature (low/medium/high), flux is suitable for mobile phone iPad tablet computer logic board PCB BGA SMD PGA welding desoldering repair. The solder paste is viscous and smooth, with little viscosity change, and the patch components are not easy to shift.

MECHANIC Solder Flux is used for mobile phone SMT PCB repair. It has full solder joints, is lead-free, environmentally friendly, and has strong adhesion.

Mainly used for welding sensors, wires, motors, fuses, connectors, metal casings, lighting, electronic components, SMT repairs, BGA chip balling, etc. It is suitable for dispensing electronic components such as resistors, capacitors, ICs, etc. on PCB surface in the SMT industry.

The above 3 types of flux can be found in Phonefix stores. In addition to flux solder paste, we also provide a variety of high-quality repair tools specifically for iPhone repairs. You can visit our website PHONEFIX to view the mobile phone repair tools you want, or you can contact us via WhatsApp to learn more about mobile phone repair tools.

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