Lesson 1Hot air rework, infrared preheat, and soldering iron skills: nozzle selection, temperature profiling, and protecting adjacent componentsCovers safe and effective use of hot air, infrared preheaters, and soldering irons for mobile boards. Focuses on nozzle choice, temperature profiles, airflow control, and shielding nearby parts from thermal and mechanical damage, building your skills.
Selecting hot air nozzles for phone board workSetting airflow and temperature for leaded and lead-freeUsing preheaters to reduce thermal shock on PCBsShielding and heat sinking nearby sensitive partsSoldering iron tip care and wetting maintenanceLesson 2Adjustable DC power supply techniques: current limiting, soft start, and interpreting standby vs surge currentsFocuses on adjustable DC supply use for powering boards during diagnosis. Topics include current limiting, soft start, reading standby versus surge currents, and recognizing patterns linked to common faults, practical for daily use.
Configuring voltage and current limit presetsUsing soft start to protect shorted boardsReading standby current signatures at idleInterpreting surge and cycling current patternsDetecting dead shorts from immediate cutoffLesson 3Microscopes, magnification choices, and imaging for documentationDescribes microscope types, magnification choices, and lighting for board work. Includes ergonomics, camera attachment, and capturing clear images for documentation, customer reports, and training records, enhancing your precision.
Choosing stereo versus digital microscopesSelecting magnification for pads and BGAsOptimizing ring light and side lighting anglesMaintaining comfortable working postureCapturing and storing repair photos and videosLesson 4Lab power injection and power rail probing: using jumper points, current meter placement, and safe injection limitsExplains lab power injection methods for tracing shorts and weak rails. Covers selecting injection points, current meter placement, safe voltage and current limits, and correlating current draw with board heating, key for fault finding.
Choosing safe jumper and injection pointsSeries ammeter placement and lead routingSetting safe voltage and current injection limitsUsing voltage drop to localize shorted areasCombining injection with thermal observationLesson 5Oscilloscope basics for mobile repair: measuring power rails, reset lines, clock presence, and transient eventsIntroduces oscilloscope use in mobile repair for viewing power rails, reset lines, clocks, and glitches. Covers probe selection, grounding, triggering, and interpreting waveforms to distinguish normal from faulty behavior, advancing your diagnostics.
Choosing probes and safe grounding pointsMeasuring DC rails for ripple and dropoutsChecking reset lines for pulses and stabilityVerifying clock presence, amplitude, and jitterCapturing transient events with proper triggeringLesson 6BGA rework station and solder paste essentials for IC replacementExplains BGA rework station setup, profile tuning, and solder paste handling for IC replacement. Emphasizes stencil use, paste types, storage, and avoiding voids or bridges during reballing and reflow on mobile logic boards, for pro results.
BGA rework station components and safety checksCreating and tuning BGA reflow temperature profilesChoosing solder paste alloy, flux type, and viscosityPaste storage, thawing, and stencil printing hygieneAvoiding voids, bridges, and head-in-pillow defectsLesson 7Thermal camera and temperature monitoring: using thermal imaging to detect shorts and hot ICsShows how to use thermal cameras and temperature probes to locate shorts, hot ICs, and abnormal heating. Covers setup, emissivity basics, safe power injection for imaging, and correlating thermal maps with schematic data, spotting issues fast.
Configuring thermal camera range and focusUnderstanding emissivity and reflective surfacesFinding shorted rails by powered thermal imagingComparing thermal maps with boardview locationsUsing contact probes for precise temperature checksLesson 8Multimeter and diode tester usage: continuity, low-ohm short testing, diode drops, and in-circuit resistance interpretationDetails correct use of multimeters and diode testers for continuity, low-ohm shorts, diode drop checks, and resistance reading in-circuit. Emphasizes range selection, probe technique, and avoiding false conclusions, your basic toolkit.
Selecting ranges and test lead configurationContinuity testing without damaging componentsLow-ohm short hunting on power railsDiode mode testing of lines and connectorsInterpreting in-circuit resistance variationsLesson 9Cleaning equipment and chemicals: IPA, ultrasonic cleaning limits, flux removers, and corrosion neutralizersCovers cleaning tools and chemicals for mobile boards, including IPA, ultrasonic tanks, flux removers, and corrosion treatments. Discusses safe use, dwell times, drying methods, and when ultrasonic cleaning is risky, keeping boards clean.
Choosing IPA grades and safe application methodsUsing ultrasonic cleaners and knowing their limitsSelecting flux removers for no-clean and rosinNeutralizing liquid damage and ionic residuesDrying techniques to prevent trapped moisture
