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Brand: MIJING

Mijing MJ-138A Solder Paste 138°C (35G)

Mijing MJ-138A Solder Paste 138°C (35G)

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Mijing MJ-138A is a lead-free, halogen-free low temperature solder paste rated at 138°C, packed in a 35g container built for mobile motherboard repair benches. GSM technicians reach for it during BGA reballing, CPU and NAND reattachment, and cold joint repair, where a standard 217°C profile risks lifting nearby components or warping thin PCB layers on a dead phone board. The no-clean flux formulation cuts down post-soldering cleanup, and the low reflow point protects sensitive components during hot air rework. It fits repair shops handling boot loop boards, IC change jobs, and reballing stencil work across Android and iPhone motherboards, giving technicians a wider safety margin on multilayer PCBs.

SKU:MST-SOLDERING-ACCESSORIES-205

⚖️ Weight: 0.35 kg

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Description

A repair bench that handles daily BGA and SMD work needs a solder paste that reflows without threatening the components sitting next to the target IC, and Mijing MJ-138A solves that problem with a 138°C melting point that sits well below the 183°C to 217°C range most general-purpose pastes demand. That lower threshold matters most when a technician is reballing a CPU, NAND, or PMIC on a dead phone board where three or four other ICs already sit close to the reflow zone, since a hotter paste raises the chance of shifting or damaging a neighboring chip during the same hot air pass. The paste comes in a 35g container, giving a workshop enough material to run multiple reballing jobs, jumper repairs, and cold solder joint fixes before a refill becomes necessary, and the lead-free, halogen-free formulation keeps the workflow aligned with RoHS-style repair practices that many service centers now expect from their tools and consumables. Mijing built the paste with a no-clean flux base, so a technician does not need to run a full isopropyl alcohol wipe after every joint, which saves time on boards where dozens of small solder points need attention in one session, such as a motherboard recovering from a dead-after-flash fault or a board showing a hang on logo symptom traced back to a cold CPU joint. The paste holds its shape under a hot air gun instead of spreading across the board, which keeps solder confined to the intended pad and reduces the risk of bridging adjacent BGA balls during reballing, a common failure point when a lower-quality paste thins out too fast under heat. High wettability lets the solder flow evenly across BGA pads and CPU or NAND contact points, producing consistent joints that hold up under the vibration and heat cycling a phone motherboard experiences during normal use, which directly affects whether a repaired board comes back with a repeat hardware fault. Technicians working reballing stencils benefit from the paste's behavior under a hot air rework station, since the 138°C threshold gives enough working time to align a stencil, apply paste, and reflow the balls before the paste dries out or the flux burns off, a sequence that becomes harder to manage with higher-temperature pastes on boards where every extra second of heat exposure adds risk. The paste also handles jumper repair and general SMD resoldering on PCB traces damaged during a previous repair attempt, since the lower reflow point means a technician can rework a small section of the board without disturbing solder joints on parts that were already reflowed at a higher temperature earlier in the repair. Repair shops in Pakistan running high volumes of motherboard-level jobs, from charging issue diagnosis to network issue troubleshooting that traces back to an RF IC, find that keeping a low-temperature paste like MJ-138A on the bench alongside a standard 183°C or 217°C paste gives more control over which components get exposed to which heat range, letting a technician match the paste to the specific fault rather than running every job at the same aggressive temperature. That flexibility becomes part of a broader board-level repair workflow that includes diagnostics, IC removal, reballing, and reattachment, with MJ-138A serving the lower end of that temperature spectrum where component protection matters more than reflow speed.A repair bench that handles daily BGA and SMD work needs a solder paste that reflows without threatening the components sitting next to the target IC, and Mijing MJ-138A solves that problem with a 138°C melting point that sits well below the 183°C to 217°C range most general-purpose pastes demand. That lower threshold matters most when a technician is reballing a CPU, NAND, or PMIC on a dead phone board where three or four other ICs already sit close to the reflow zone, since a hotter paste raises the chance of shifting or damaging a neighboring chip during the same hot air pass. The paste comes in a 35g container, giving a workshop enough material to run multiple reballing jobs, jumper repairs, and cold solder joint fixes before a refill becomes necessary, and the lead-free, halogen-free formulation keeps the workflow aligned with RoHS-style repair practices that many service centers now expect from their tools and consumables. Mijing built the paste with a no-clean flux base, so a technician does not need to run a full isopropyl alcohol wipe after every joint, which saves time on boards where dozens of small solder points need attention in one session, such as a motherboard recovering from a dead-after-flash fault or a board showing a hang on logo symptom traced back to a cold CPU joint. The paste holds its shape under a hot air gun instead of spreading across the board, which keeps solder confined to the intended pad and reduces the risk of bridging adjacent BGA balls during reballing, a common failure point when a lower-quality paste thins out too fast under heat. High wettability lets the solder flow evenly across BGA pads and CPU or NAND contact points, producing consistent joints that hold up under the vibration and heat cycling a phone motherboard experiences during normal use, which directly affects whether a repaired board comes back with a repeat hardware fault. Technicians working reballing stencils benefit from the paste's behavior under a hot air rework station, since the 138°C threshold gives enough working time to align a stencil, apply paste, and reflow the balls before the paste dries out or the flux burns off, a sequence that becomes harder to manage with higher-temperature pastes on boards where every extra second of heat exposure adds risk. The paste also handles jumper repair and general SMD resoldering on PCB traces damaged during a previous repair attempt, since the lower reflow point means a technician can rework a small section of the board without disturbing solder joints on parts that were already reflowed at a higher temperature earlier in the repair. Repair shops in Pakistan running high volumes of motherboard-level jobs, from charging issue diagnosis to network issue troubleshooting that traces back to an RF IC, find that keeping a low-temperature paste like MJ-138A on the bench alongside a standard 183°C or 217°C paste gives more control over which components get exposed to which heat range, letting a technician match the paste to the specific fault rather than running every job at the same aggressive temperature. That flexibility becomes part of a broader board-level repair workflow that includes diagnostics, IC removal, reballing, and reattachment, with MJ-138A serving the lower end of that temperature spectrum where component protection matters more than reflow speed.

Key Features

  • 138°C low melting point reduces heat stress on nearby SMD components during rework
  • Lead-free and halogen-free formulation supports RoHS-aligned repair practices
  • No-clean flux residue lowers post-soldering cleanup on motherboard PCBs
  • 35g container supplies enough paste for multiple reballing and IC jobs
  • High wettability helps solder flow evenly across BGA pads and CPU/NAND contacts
  • Stable paste consistency holds its shape under hot air without spreading onto adjacent pads
  • Suited for reballing stencils, jumper repair, and direct chip reattachment work
  • Compact packaging fits directly into a repair bench toolkit alongside flux and wick

Specifications

Brand Entity Mijing
Product Entity MJ-138A Low Temperature Solder Paste 138°C 35g
Technology Entity Lead-free, halogen-free no-clean solder paste formulation
Compatible Device Entities Android and iPhone motherboards, BGA and SMD chipsets
Repair Process Entity BGA reballing, CPU/NAND reattachment, cold joint repair, hot air rework
Industry Entity Mobile Phone Repair Industry, PCB Repair Industry, GSM Technician Workshops

Compatible Devices


Universal — not device-specific. Works at board level across Android and iPhone motherboards, applicable wherever BGA or SMD components use lead-free solder balls compatible with a 138°C reflow profile, including CPU, NAND, PMIC, and other IC packages during reballing or reattachment work.

Common Repair Uses


BGA IC reballing, CPU and NAND reattachment after chip removal, cold solder joint repair on dead-after-flash boards, jumper repair on damaged PCB traces, and general SMD component resoldering during motherboard-level fault diagnosis.

FAQ

What is the product name?
The product name is Mijing MJ-138A Solder Paste 138°C 35g.
What is the brand of this product?
The brand of this product is Mijing.
What is the model of this product?
The model of this product is MJ-138A.
What is this product used for?
This product is used for BGA reballing, CPU and NAND reattachment, cold solder joint repair, and general SMD resoldering on mobile motherboards.
Which devices are compatible with this product?
This product works at board level across Android and iPhone motherboards, applicable to any BGA or SMD component compatible with a 138°C reflow profile.
Who should use this product?
This product is suitable for mobile repair technicians, repair shops, service centers, and professional PCB rework users.
Does MJ-138A solder paste work with lead-free BGA balls used on iPhone and Android boards?
Yes, it works with standard lead-free BGA balls, and its 138°C melting point suits reballing jobs where a higher-temperature paste risks damaging heat-sensitive components nearby.
Can MJ-138A be used with a hot air rework station for CPU or NAND reattachment?
Yes, apply a thin layer under a hot air rework station set to reach the 138°C reflow point, which suits CPU and NAND IC reattachment directly on the motherboard.