Humphrey Kimathi's CRT TV Repair Ebook: A Must-Have Resource for Electronics Repairers
CRT TV Repair Ebook by Humphrey Kimathi: A Comprehensive Guide for Technicians
If you are a technician who wants to learn more about CRT TV repair, you might be interested in this ebook by Humphrey Kimathi. This ebook covers all the major circuit blocks in CRT TV with emphasis given to real life scenarios from the technician work bench. It provides a good source of reference for practicing technicians who want to improve their skills and solve common problems.
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In this article, we will give you an overview of what this ebook is about, what it can teach you, and why you should get it. We will also introduce you to Humphrey Kimathi, the author of this ebook, who is a professional electronics engineer with over 20 years of experience in TV repair.
Introduction: What is the ebook about and why is it useful for TV repairers?
CRT TV stands for cathode ray tube television, which is a type of television that uses a vacuum tube to display images on a phosphor-coated screen. CRT TV was the most common type of television until the advent of flat-screen technologies such as LCD and plasma.
CRT TV is composed of several circuit blocks that work together to produce sound and picture. These circuit blocks include power supply, horizontal circuits, vertical circuits, color circuits, audio circuits, and tuner circuits. Each circuit block has its own function and components, and each can have its own problems and faults.
The ebook by Humphrey Kimathi is a comprehensive guide that explains the basic functions and common problems associated with each circuit block in CRT TV. It also provides practical tips and tricks on how to troubleshoot and repair these problems using simple tools and techniques.
The ebook is divided into two parts: part one is an overview of the major circuit blocks in CRT TV, and part two is a collection of real life repair histories from the technician work bench. The ebook is illustrated with numerous color photos to make the reader learn faster and get the concept easily.
The ebook is useful for TV repairers because it can help them understand how CRT TV works, what are the possible causes of faults, and how to fix them. It can also help them save time and money by avoiding unnecessary replacements or trial and error methods. The ebook can also help them enhance their skills and confidence as technicians.
The ebook is written in a simple and clear language that anyone can understand. It does not require any prior knowledge or experience in electronics or TV repair. It is suitable for beginners as well as advanced technicians who want to refresh their knowledge or learn new things.
Part one: Overview of the major circuit blocks in CRT TV and their functions and problems
In this part of the ebook, Humphrey Kimathi explains the structure and function of each circuit block in CRT TV. He also describes the common problems that can occur in each circuit block and how to diagnose and fix them. He provides detailed diagrams and photos to illustrate his points and make them easy to follow.
Here are the main circuit blocks that he covers in this part:
Power supply (S.M.P.S)
The power supply is the circuit block that converts the AC mains voltage to various DC voltages that are needed by other circuit blocks in CRT TV. The power supply uses a switch mode power supply (S.M.P.S) technique, which is more efficient and compact than the conventional linear power supply.
The power supply consists of several components, such as transformer, diode, capacitor, resistor, transistor, control IC, optocoupler, etc. These components form sub units of S.M.P.S, such as primary supply, secondary supply, feedback circuit, protection circuit, etc.
The power supply can have various problems, such as no power, low power, high power, intermittent power, etc. These problems can be caused by faulty components, short circuits, open circuits, bad solder joints, etc. To troubleshoot these problems, Humphrey Kimathi shows how to use a multimeter, an oscilloscope, a series lamp current limiter, etc. He also shows how to repair these problems by replacing or repairing the faulty components.
Horizontal circuits
The horizontal circuits are the circuit block that generate the horizontal deflection signal for CRT TV. The horizontal deflection signal is a high frequency sawtooth wave that drives the horizontal deflection coil (yoke) to scan the electron beam from left to right across the screen.
The horizontal circuits consist of several components, such as oscillator, driver, output transistor (H.O.T), flyback transformer (F.B.T), damper diode, etc. These components form sub units of horizontal circuits, such as horizontal oscillator stage, horizontal driver stage, horizontal output stage, etc.
The horizontal circuits can have various problems, such as no horizontal deflection, horizontal line on screen, horizontal size or position error, H.O.T shorting or overheating, F.B.T arcing or burning, etc. These problems can be caused by faulty components, short circuits, open circuits, bad solder joints, etc. To troubleshoot these problems, Humphrey Kimathi shows how to use a multimeter, an oscilloscope, a series lamp current limiter, etc. He also shows how to repair these problems by replacing or repairing Vertical circuits
The vertical circuits are the circuit block that generate the vertical deflection signal for CRT TV. The vertical deflection signal is a low frequency sawtooth wave that drives the vertical deflection coil (yoke) to scan the electron beam from top to bottom across the screen.
The vertical circuits consist of several components, such as oscillator, driver, output transistor, capacitor, resistor, etc. These components form sub units of vertical circuits, such as vertical oscillator stage, vertical driver stage, vertical output stage, etc.
The vertical circuits can have various problems, such as no vertical deflection, vertical line on screen, vertical size or position error, vertical collapse or foldover, vertical linearity or pincushion distortion, etc. These problems can be caused by faulty components, short circuits, open circuits, bad solder joints, etc. To troubleshoot these problems, Humphrey Kimathi shows how to use a multimeter, an oscilloscope, a series lamp current limiter, etc. He also shows how to repair these problems by replacing or repairing the faulty components.
Color circuits
The color circuits are the circuit block that produce the color signals for CRT TV. The color signals are red, green and blue (RGB) voltages that modulate the intensity of the three electron beams in the CRT tube. The color signals are derived from the composite video signal (CVBS) that contains both luminance (brightness) and chrominance (color) information.
The color circuits consist of several components, such as chroma IC, crystal oscillator, color killer, color amplifier, matrix circuit, etc. These components form sub units of color circuits, such as chroma demodulator stage, color burst stage, color control stage, RGB output stage, etc.
The color circuits can have various problems, such as no color, one color missing or dominant, wrong color or tint, color purity or convergence error, etc. These problems can be caused by faulty components, short circuits, open circuits, bad solder joints, etc. To troubleshoot these problems, Humphrey Kimathi shows how to use a multimeter, an oscilloscope, a color bar generator, a degaussing coil, etc. He also shows how to repair these problems by replacing or repairing Audio circuits
The audio circuits are the circuit block that amplify the sound signals for CRT TV. The sound signals are derived from the composite video signal (CVBS) or from the tuner circuit (RF) depending on the input source. The sound signals are then processed and amplified by the audio circuits to drive the speakers.
The audio circuits consist of several components, such as audio IC, volume control, tone control, speaker, etc. These components form sub units of audio circuits, such as audio demodulator stage, audio amplifier stage, audio output stage, etc.
The audio circuits can have various problems, such as no sound, low sound, distorted sound, noisy sound, etc. These problems can be caused by faulty components, short circuits, open circuits, bad solder joints, etc. To troubleshoot these problems, Humphrey Kimathi shows how to use a multimeter, an oscilloscope, a signal injector, a signal tracer, etc. He also shows how to repair these problems by replacing or repairing the faulty components.
Tuner circuits
The tuner circuits are the circuit block that receive and process the RF signals for CRT TV. The RF signals are the radio frequency signals that carry both video and audio information from the broadcast station or from the cable or satellite provider. The tuner circuits select the desired channel and convert the RF signals to intermediate frequency (IF) signals.
The tuner circuits consist of several components, such as tuner unit, IF amplifier, video detector, AGC circuit, etc. These components form sub units of tuner circuits, such as RF stage, mixer stage, IF stage, video stage, etc.
The tuner circuits can have various problems, such as no signal, weak signal, snowy picture, ghosting picture, etc. These problems can be caused by faulty components, short circuits, open circuits, bad solder joints, etc. To troubleshoot these problems, Humphrey Kimathi shows how to use a multimeter, an oscilloscope, a signal generator, a signal level meter, etc. He also shows how to repair these problems by replacing or repairing Part two: Real life repair histories from the technician work bench
In this part of the ebook, Humphrey Kimathi shares his real life repair experiences from his technician work bench. He shows how he solved various problems and faults in CRT TV using his knowledge and skills. He provides detailed descriptions and explanations of the symptoms, causes, solutions, and tips for each case. He also provides color photos of the actual TV sets and components to illustrate his points and make them easy to follow.
Here are some of the cases that he covers in this part:
Case 1: CRT Television (SONNI-MAX) dead now repaired
In this case, Humphrey Kimathi shows how he repaired a dead CRT TV that had no power at all. He explains how he checked the main fuse and found it blown. He then replaced the fuse and tested the TV again, but it still did not work. He then checked the power supply and found a shorted diode in the primary supply. He replaced the diode and tested the TV again, but it still did not work. He then checked the horizontal output transistor (H.O.T) and found it shorted as well. He replaced the H.O.T and tested the TV again, and this time it worked fine.
Case 2: How I repaired a DVD home theatre system with No Disc symptoms
In this case, Humphrey Kimathi shows how he repaired a DVD home theatre system that had a No Disc symptom. He explains how he opened the system and checked the disc tray mechanism and found it working properly. He then checked the laser lens and found it dirty. He cleaned the lens with a cotton bud and alcohol and tested the system again, but it still did not read any disc. He then checked the laser pickup unit and found it faulty. He replaced the laser pickup unit and tested the system again, and this time it read all discs without any problem.
Case 3: LG 14 inch CRT Ultra slim television with shut down symptoms now repaired
In this case, Humphrey Kimathi shows how he repaired an LG 14 inch CRT Ultra slim television that had a shut down symptom. He explains how he turned on the TV and observed that it would work for a few seconds and then shut down by itself. He then opened the TV and checked the power supply and found no problem. He then checked the horizontal circuits and found a dry solder joint on the flyback transformer pin. He resoldered the pin and tested the TV again, but it still had the same problem. He then checked the vertical circuits and found a bad capacitor in the vertical output stage. He replaced the capacitor and tested Case 4: DVD player dead now repaired
In this case, Humphrey Kimathi shows how he repaired a dead DVD player that had no power at all. He explains how he checked the main fuse and found it intact. He then checked the power supply and found a shorted diode in the secondary supply. He replaced the diode and tested the player again, but it still did not work. He then checked the main board and found a shorted capacitor in the standby circuit. He replaced the capacitor and tested the player again, and this time it worked fine.
Case 5: What is the future of electronics repairing?
In this case, Humphrey Kimathi shares his thoughts on the future of electronics repairing. He explains how technology is changing rapidly and how new devices and systems are emerging every day. He also explains how these changes affect the electronics repair industry and what are the challenges and opportunities for technicians. He gives some advice on how to keep up with the latest trends and developments and how to improve one's skills and knowledge.
Conclusion: Summary of the main points and benefits of the ebook
In conclusion, we have seen that CRT TV Repair Ebook by Humphrey Kimathi is a valuable resource for anyone who wants to learn more about CRT TV repair. The ebook covers all the major circuit blocks in CRT TV with emphasis given to real life scenario from the technician work bench. The ebook provides a good source of reference for practicing technicians who want to improve their skills and solve common problems.
The ebook is written in a simple and clear language that anyone can understand. It does not require any prior knowledge or experience in electronics or TV repair. It is suitable for beginners as well as advanced technicians who want to refresh their knowledge or learn new things.
The ebook is illustrated with numerous color photos to make the reader learn faster and get the concept easily. The ebook is divided into two parts: part one is an overview of the major circuit blocks in CRT TV, and part two is a collection of real life repair histories from the technician work bench.
The ebook is available for free download from Humphrey Kimathi's website: https://humphreykimathi.com/freebook.php. You can also find more information about Humphrey Kimathi and his other ebooks and articles on his blog: http://humphreykimathi.blogspot.com.
If you are interested in CRT TV repair, you should definitely get this ebook and learn from Humphrey Kimathi's experience and expertise. You will not regret it!
FAQs
Here are some frequently asked questions about CRT TV Repair Ebook by Humphrey Kimathi:
Q: How can I download the ebook?
A: You can download the ebook by clicking on this link: https://humphreykimathi.com/freebook.php. You will need a PDF reader software to open and read the ebook.
Q: How can I contact Humphrey Kimathi?
A: You can contact Humphrey Kimathi by sending him an email at humphreykimathi@gmail.com or by leaving a comment on his blog: http://humphreykimathi.blogspot.com.
Q: What are some other ebooks or articles by Humphrey Kimathi?
A: Some other ebooks or articles by Humphrey Kimathi are:
LCD LED Television Repair Tips
Plasma Television Repair Tips
Basic Electronics Course
How To Repair LCD Monitor With No Display Problem
How To Repair A Laptop With No Power Problem
You can find more information about these ebooks or articles on his website: https://humphreykimathi.com/ or on his blog: http://humphreykimathi.blogspot.com.
Q: What are some other resources for learning electronics or TV repair?
A: Some other resources for learning electronics or TV repair are:
Jestine Yong's website: https://jestineyong.com/
Damon Morrow's website: https://www.diy-television-repair.com/
Electronics Repair FAQ website: https://www.electronicsrepairfaq.com/
Electronics Repair Forum website: https://www.electronicsrepairforum.com/
Electronics Repair YouTube channel: https://www.youtube.com/channel/UCjxU_X4Nf0uLc3cgxG6sQmw
Q: What are some tips for becoming a successful electronics or TV repair technician?
A: Some tips for becoming a successful electronics or TV repair technician are:
Keep learning and updating your knowledge and skills.
Practice and experiment with different devices and systems.
Use the right tools and equipment for the job.
Follow safety precautions and avoid potential hazards.
Be honest and professional with your customers and colleagues.
Enjoy your work and have fun!
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