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Sesión de formación diagnóstico electrónico TDPEV 1 - 2 de septiembre de 2024
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Sesión de formación diagnóstico electrónico TDPEV 1 - 2 de septiembre de 2024

Introduction to Electronic Repair Methods

Overview of the Class

  • The session focuses on diagnostic methods and repair techniques for electronic circuit boards, emphasizing their importance in handling both personal and external electronic products.
  • A course material is provided that includes various lessons, some of which have already been covered, such as component removal. Reading the material is highly recommended.

Types of Damage in Electronic Devices

  • Three main types of damage can occur in electronic devices:
  • Visual Inspection: Components may be dirty or poorly maintained, leading to potential shorts or damaged components.
  • Burned Boards: Damage can also occur directly to the circuit board itself.
  • Soldering Issues: Defective solder joints can lead to failures; inspecting these requires simple techniques like reflowing with a soldering iron at an appropriate temperature (e.g., 350°C).

Techniques for Repairing Circuit Boards

Common Repair Procedures

  • The class will cover several repair techniques applicable to double-sided and multi-layer circuit boards:
  • Repairing Conductors: Using wire and flat conductors.
  • Fixing Broken Tracks: Addressing missing or damaged tracks and metallized holes.
  • Connector Repairs: Steps will be practical based on the type of board being repaired.

Recommended Practice

  • It is advised to practice these techniques on non-functional or obsolete equipment rather than valuable devices. This allows for hands-on experience without risk. A sample practice board will be used during demonstrations.

Initial Steps in Circuit Board Repair

Cleaning Before Repairs

  • All contaminants must be removed from the surface before starting repairs; solvents should be used for cleaning.
  • If there are coatings present, they need complete removal from the area being repaired before proceeding with conductor repairs.

Techniques for Damaged Tracks

  • For small cuts or damages on tracks:
  • Soldering might seem tempting but using wire bridges made from copper foil is often more effective.
  • Alternatively, transplant a track from a donor board if available. This method ensures better integrity compared to solder alone.

Practical Demonstration of Track Repair

First Technique Demonstration

  • The instructor demonstrates creating an intentional cut on a track as part of the teaching process.
  • Emphasis is placed on proper tool usage; excessive pressure with tools like soldering irons can cause damage if not handled correctly (especially at high temperatures).

Cleaning Supplies for Repairs

  • Essential cleaning supplies include:
  • Isopropyl alcohol,
  • Thinner,
  • A combination of both for optimal effectiveness during repairs.

Prototyping Techniques and Repair Methods

Introduction to Prototyping Tools

  • The speaker introduces the use of a broken CNC drill bit for prototyping, emphasizing its durability and potential for reuse in various operations.
  • A surgical scalpel blade (number 11) is recommended for scraping without damaging circuit boards, highlighting the importance of precision tools in prototyping.

Soldering Station Setup

  • The soldering station is set to approximately 315 degrees Celsius. Liquid flux is applied, with a suggestion to create homemade flux as a cost-effective alternative.
  • A thin layer of solder is applied using the soldering iron on scraped areas, which prepares them for repair.

Materials for Circuit Board Repair

  • Enamelled wire (copper wire used in devices like motors and speakers) is identified as the primary material for repairs due to its heat-sensitive insulation that can be easily removed.
  • The enamel coating provides electrical insulation, making it suitable for areas requiring isolation; excess wire can be trimmed with a scalpel or diagonal cutting pliers.

Techniques for Effective Repairs

  • Heat and solder are utilized to burn off enamel from wires, facilitating easier connections during repairs.
  • Different gauges of enamelled wire should be available to match the current capacity required by specific circuit traces.

Alternative Repair Methods

  • An alternative method involves using regular wire; however, it requires tinning due to oxidation issues. Enamelled wire offers better corrosion resistance.
  • Another technique includes wrapping the board and soldering from the opposite side while being cautious about potential collisions with other components on double-sided boards.

Using Copper Sheets and Kits

  • Copper sheets can also be employed in repairs; however, care must be taken regarding trace alignment on both sides of multilayer boards.
  • Pre-made kits containing copper sheets allow users to create their own printed circuit board designs through techniques like ironing onto copper foil before etching.

Conclusion on Material Sources

Repairing Circuit Board Tracks with Copper Foil

Overview of Repair Techniques

  • The presentation discusses using commercial copper foil for repairing damaged circuit board tracks, emphasizing its versatility in various applications.
  • The first step in the repair process is cleaning the area around the damaged track to assess the extent of the damage effectively.

Steps for Track Repair

  • After cleaning, tools are used to scrape both ends of the damaged track to ensure they adhere properly to the substrate; if not, cutting and extending may be necessary.
  • The technique allows for precise reconstruction of specific areas according to size and shape requirements, which can be illustrated through drawings or examples from previous projects.

Tools and Materials

  • Recommended tools include a scalpel or utility knife for cutting copper foil accurately; these tools provide better control than larger scissors.
  • Applying flux is crucial before soldering; a watercolor brush or a cleaned nail polish bottle can serve as effective applicators.

Soldering Process

  • When placing the copper foil on the track, it’s important to leave margins on either side for proper solder adhesion and strength.
  • Care must be taken during heating to avoid lifting the foil; maintaining good solder joints ensures that current flows correctly through repaired tracks.

Additional Considerations

  • Commercially available copper sheets are often pre-tinned, making them easier to work with when soldering onto existing tracks.

Techniques for Electronic Card Repair

Overview of Techniques

  • Introduction to a third technique involving the transplantation of electronic cards, emphasizing its recommendation for effective repairs.

Use of Copper Tape

  • Discussion on the use of adhesive copper tape in this technique; it is noted that while useful, the adhesive side does not withstand high temperatures.

Prototyping with Copper Tape

  • Copper tape can be utilized for prototyping and adding additional ground planes to circuit boards, including universal printed circuit boards (PCBs).

Recycling Damaged Cards

  • Explanation of how to recycle parts from damaged electronic cards by removing tracks that are similar in size and shape to those needing repair.

Tools for Track Removal

  • Recommended tools include a specific type of scalpel (number 10 or 11), which is effective for making oblique cuts to lift tracks from discarded cards.

Cleaning Process

  • Importance of cleaning the area with isopropyl alcohol after track removal; suggested applicators include syringes or beauty salon bottles designed for nail polish remover.

Advantages of This Technique

  • The advantage lies in obtaining precise portions that match the required track shapes, minimizing visibility post-repair.

Adhesive Properties and Cautions

  • Discussion on the delicate nature of PCB adhesives; they can easily break under heat, allowing for easier lifting of copper tracks when done correctly.

Sourcing Replacement Tracks

  • Emphasis on sourcing exact replacements from donor cards, noting that some cards may have more accessible copper than others.

Final Steps in Repair Process

Repairing Circuit Boards: Techniques and Tools

Overview of the Repair Process

  • The repair process involves enlarging a hole using a drill and utilizing a rivet to secure connections effectively.
  • A case study is presented involving a laptop charger with lost tracks and pads, highlighting common issues in circuit board design.

Identifying Design Flaws

  • The output voltage is affected by the connection between terminals; improper hole size leads to mechanical stress on the track.
  • A significant design flaw is identified where an oversized hole causes solder to fill gaps inadequately, risking disconnection under tension.

Consequences of Poor Design

  • Mechanical pulling can lead to tracks being torn away from the board, resulting in damage that requires more than just simple repairs.
  • Merely replacing the track isn't sufficient without ensuring it has proper mechanical support.

Repair Methods and Materials

  • Various methods exist for repairing damaged tracks, including using copper rivets for added mechanical strength.
  • Copper rivet kits are available commercially in different sizes, essential for repairing double-sided boards effectively.

Ensuring Electrical Connection

  • It's crucial to maintain internal connections through metallized holes; losing these connections compromises functionality.
  • Rivets or eyelets can restore electrical connectivity while providing necessary mechanical reinforcement.

Practical Application of Riveting

  • Proper drilling techniques are emphasized; use a drill bit slightly larger than the rivet diameter for effective insertion.
  • Inserting a rivet enhances both mechanical robustness and reliable electrical connection across damaged areas.

Custom Tool Development

  • A custom riveting tool was designed due to high costs of commercial options; this tool allows precise application of rivets.
  • Plans for creating this tool are shared, emphasizing its adaptability for various types of rivets used in electronic repairs.

Conclusion on Repair Techniques

How to Use a Riveting Tool for Circuit Board Repairs

Preparing the Riveting Tool

  • The first step involves widening the hole of the riveting tool, as factory-made holes are often too narrow.
  • After adjusting the diameter, insert the tip of the riveting tool vertically onto a metal surface that acts as an anvil.

Executing the Rivet

  • Rotate the tool carefully while applying pressure with a small hammer to avoid breaking the tip; this creates a rivet on one side and folds it inward.
  • If necessary, use a thinner needle to further open up any tight areas for better access.

Practical Applications and Recommendations

  • The speaker encourages viewers to design their own riveting tools, especially useful for double-sided printed circuit boards (PCBs).
  • Components can be inserted through these rivets; typically, resistor terminals fit without issue but may require slight adjustments with a needle.

Repairing Damaged Pads

  • For damaged pads on PCBs, using appropriately sized rivets is crucial after reconstructing any lost tracks.
  • The process includes creating a new pad shape from copper sheet material and soldering it in place before inserting a larger rivet if needed.

Final Steps in Repair Process

  • Ensure that any wires or cables can pass through the rivet hole; adjustments may be required based on available materials.
  • Once everything is aligned correctly, proceed with riveting and soldering to secure connections effectively.

Material Considerations

  • A standard kit of rivets is recommended for repairs; common sizes accommodate most electronic components like resistors and capacitors.
  • Emphasize using appropriate internal dimensions for terminal fittings when selecting rivets.

Conclusion: Importance of Careful Handling

Techniques for Circuit Board Reconstruction

Overview of Reconstruction Techniques

  • Discussion on the importance of reconstruction and restoration techniques in circuit board repair, particularly addressing design flaws from previous work.

Micro USB Port Repair Insights

  • The speaker highlights common issues with micro USB ports in speakers, noting that manufacturers often use ports soldered only to pads without mechanical reinforcement.
  • Truol components are introduced as a solution, providing better mechanical support through rigid posts or terminals embedded in the substrate, preventing disconnections when cables are pulled.

Challenges in Repairing Circuit Boards

  • A question arises about using wire to reconstruct damaged pads; the speaker confirms this is possible but emphasizes the need for proper mechanical stability to avoid future failures.
  • The necessity of remaking connections securely is stressed, as simple soldering may not withstand movement over time.

Advanced Techniques for SMD Pads

  • The speaker mentions that similar techniques can be applied to surface mount device (SMD) pads using thin copper wire for reconstruction.
  • Videos demonstrating these techniques are referenced, indicating their relevance not just for circuit boards but also for mobile phone repairs.

Practical Steps in Reconstruction

  • A method involving wrapping wire around pads to simulate original pad shapes is discussed, especially useful for round pads found on certain components like VGA connectors.

Detailed Process of Pad Reconstruction

  • Instructions on cutting and preparing wires or copper sheets to match pad sizes are provided.
  • Emphasis on ensuring proper soldering technique and placement during reconstruction efforts.

Finalizing Repairs with Mechanical Stability

  • The process involves ensuring excess conductor material does not interfere with connections while maintaining structural integrity.

Time Investment in Repairs

  • It’s noted that complex repairs can take several hours depending on damage extent and required precision during reconstruction efforts.

Repairing Circuit Boards with Rivets

Overview of the Repair Process

  • The speaker discusses the need to adjust a rivet that is too long, suggesting either trimming it or using a shorter rivet if available.
  • The repair process is described as tedious but necessary, emphasizing the importance of learning these skills for effective repairs.
  • A tool is mentioned that has not yet been measured; plans are made to create a blueprint for it, highlighting its affordability and utility in working with circuit boards.

Tools and Techniques

  • An automatic center punch tool is introduced to help open up the rivet more effectively during the repair process.
  • The speaker explains how to close the rivet using a hammer and appropriate tools, noting that they lack a specific type of riveting machine needed for different diameters.

Finalizing Repairs

  • Despite lacking an ideal riveting machine, the speaker demonstrates how to use available tools to reinforce double-layered circuit boards effectively.
  • The repaired pad and track are shown, preparing for soldering both wire and rivet together for electrical connection.

Soldering Techniques

  • Emphasis on careful soldering techniques is given to avoid creating shorts by ensuring solder does not flow into unwanted areas.
  • The speaker demonstrates pushing solder beneath the rivet where wire connections exist, ensuring complete filling of metalized holes.

Importance of Riveting in Repairs

  • Riveting is highlighted as an effective technique for achieving strong mechanical and electrical connections in circuit board repairs.
  • Using wires alone may not provide adequate support; thus, proper riveting ensures durability against disconnections over time.

Enhancing Electrical Capacity

  • Discussion on increasing electrical capacity through copper area enhancement within metalized holes; larger holes can handle more current than smaller ones.
  • A standard 0.88 mm metalized hole can only conduct about 1 to 2 amperes, stressing design considerations in circuit board layouts.

Repairing Circuit Boards: Key Techniques

Overview of Repair Process

  • The speaker discusses the process of repairing a circuit board, emphasizing the importance of proper techniques and materials used in soldering.
  • Basic repairs often involve addressing issues with prototypes that may have design flaws or incorrect connections, necessitating "first aid" for these components.
  • Common sources of problems include components sourced from manufacturers, which may require adjustments to ensure functionality.

Identifying and Correcting Design Flaws

  • The speaker highlights a specific issue with an oversized hole in the circuit board design that causes instability in component placement.
  • To remedy this, additional solder is applied to reinforce connections and stabilize components during repair.

Finalizing Repairs

  • The importance of ensuring that cables are secured properly is discussed; any movement can lead to further issues if not addressed.
  • A thorough review of the repaired area is essential, particularly checking for continuity and shorts between connections.

Review and Additional Resources

  • After completing repairs, it's crucial to verify that there are no unintended shorts while confirming continuity across the circuit paths.
  • The speaker recommends reviewing supplementary video material related to Chapter 6 on card repair techniques for deeper understanding.