Tuesday, December 27, 2011

Thursday, December 22, 2011

Magnetic Core Selection for Transformers and Inductors (Electrical and Computer Engineering)

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Written as a companion to Transformer and Inductor Design Handbook (second ed), this work compiles the specifications of over 12,000 industrially available cores and brings them in line with standard units of measurement, simplifying the selection of core configurations for the design of magnetic components.

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Friday, December 16, 2011

- MSH9ACM01 Flyback transformer - MSH9ACM01

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Wednesday, December 7, 2011

Flyback agent video 3

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Heres is the flyback again but this time I have it mounted on wood

Flyback agent video 3

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Saturday, November 26, 2011

Transformer Rectifier

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Friday, November 18, 2011

- 223-E13C-3G1211 Flyback transformer - CP334P00301

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223-E13C-3G1211 Flyback transformer

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Tuesday, November 8, 2011

Electronic Intermittent Problem - The Easy Way To Repair It

!: Electronic Intermittent Problem - The Easy Way To Repair It

Troubleshooting and repairing electronic solid problems like no power, no display, color out and etc could be very straightforward if you know the right way to do it. For example, a replacement of fuse restored the equipment back to life. It's easy and very direct but there are problems in the electronic circuits that can silently "steal" away your precious time if you do not know how to efficiently tackle the problems. The problem that I'm referring to is the "intermittent problems".

The word "intermittent" according to dictionary dot com means "alternately functioning and not functioning or alternately functioning properly and improperly". Take Monitor for instance, the red color may go off and comes back by itself or when you gently knock on the Monitor casing or cover. That's right, any electronic components and circuits may or may not have the tendency to go intermittent and it all depends on the circuit designs, quality of components, environment and other factors. In some tough dog (difficult to repair) cases, a Monitor can work well for 8 hours and then suddenly just go off. When you switch the Monitor off and then switch it "On", the Monitor will again work for couples of hours before shutting it down. If you do not know the right and absolute way to solve this "intermittent problem", troubleshooting time will be lost and at the end you still could not locate the fault. Sometimes it is very frustrated too to locate intermittent problem because you just do not know where to begin.

Whenever you tap on the board (in all directions) with the handle of the screw driver, the display stop waving! In other words, no matter where you tap the board, the display shows some response. You may ask yourself these questions "should I check the primary side or the secondary side?" "Should I resolder the whole board (will take you lots of hours)?" "Should I replace all the suspected components in a particular circuit?" and the questions can go on and on. The answers to your questions are it depends on how the problems surface. In this article, I'm going to reveal all the possible ways that can cause intermittent problem and how to solve it.

The most obvious intermittent problem is when you hit the board with the handle of screw driver; there will be effect on the equipment. Take Monitor as an example, if you noticed that the display color flashes on and off, the first thing you do is to head to the CRT board section. Gently tap the CRT board with the handle of the screw driver; you could see that the display now will come back to normal. This is an absolute problem on a specific location (CRT board only) where you can easily detect and solve it by resoldering the joints (apply fresh solder to joints), reinsert the CRT board socket to the PC tube and reseat (unplugging and plugging several times) the VGA color signal cable.

Next is the thermal intermittent problem, where a component works okay when it is cool and problem arises when in the high temperature. In order to detect such problem, we need to use a little heat so that the problem can surface faster without you wasting hours to wait for it to happen. By placing a 100 watt bulb near the board of the equipment, the circuits will become quite warm after a few minutes. You may also use a hair dryer to point or focus on the circuit board. Be careful not to overheat the circuits as some plastic materials can be easily damaged or melt. Once the problem appears when it is hot, now is the time you use a can of freezer or spray cooler to rapidly cool the circuit components. A spray tube is included to control the application closely. Thus it is easy to confine the spray to one component at a time. Usually the circuit freezer temperature is about minus 40 Celsius. Once the faulty or intermittent component sprayed by the cold temperature, it will begin to work properly and the problem will immediately disappear. Most of the time using this method can help you to locate the bad components right to the spot.

A loose contact inside relays also may develop intermittent problem. Just tap on the relay when the equipment is working to see if there are any changes. Be careful when you are tapping the relay as the power is on. Replace with a new relay if you suspect it is the cause of the intermittent problem. Do you know that some technicians cut open the relay to service the internal contact with sand paper? You may try that method if you wish to.

Certain intermittent problems were not due to faulty components; in fact it was the board itself and the soldering or designs that causes the problems. Take a look at the bottom photos where you could clearly see that a component's lead is touching on the other track, a component's lead is touching on the other lead and some hairline cracked in the circuit track cause by a fall or some severe vibration! The hairline cracked can be easily seen by using a lighted magnifying glass.

Some boards have small presets and variable resistors (VR) on it thus it may be necessary to service those components after few years the equipment in service. The wiper inside the variable resistors can accumulate dust and causing intermittent in controlling the sound, display and etc. Just use a can of Philips oil base spray and spray into the variable resistors and it will work as good as new. However, after servicing the variable resistor and there is no improvement, then it's the time to replace with a new VR. Please do not use a video head cleaner to service a VR as it will dry up fast and the intermittent may rise again.

Another component that you need to watch is the microswitch button. It may check good testing with a multimeter but breakdown when the equipment is running. Isolate all possibilities in order to successfully repair an intermittent problem. If possible just direct replace the switch and who knows the intermittent problem can be fixed!

Many technicians do not know that besides tackling the intermittent problem from behind the board, one must also be sensitive that many intermittent problems can be solved by removing the whole board because you could clearly see all area and all possible causes that made up the intermittent problems. Diode lead shorted to resistor lead, capacitors shorted with each others, resistor body touching the heatsink, resistor shorted to capacitor body, decayed glue in many parts of the circuit (you need to remove it), fading resistors color bands and many more. Carefully study the photos below and begin to absorb all the information that can help you to locate an intermittent problem fast.

There was one case where the Monitor was switch "on", it has intermittent shutdown problem. I really spent lots of time trying to tackle the faults from behind the board. Flyback transformer replaced, PC tube changed, voltage testing on all circuits to be okay, but somehow I just could not locate the cause of the problem. This is where you can see the real frustration face of Jestine Yong if you are beside me. To cut long story short, I removed the board and begin to see from "in front". Yet no obvious signs of problem can be detected. Since the board already had been removed, I just try opening up the HOT, to my surprised the back of HOT have a slight burnt mark on it. It causes a slight spark to the heatsink and shutting down the Monitor intermittently. The good news was that there were many similar cases happened to this model of Monitor. It just took me a couple of minutes to solve it. Who knows this problem could be happen in TV and others electronic equipment too. Not only that, the experienced that I learned from this case had help me to narrow down any possible cause especially dealing with transistors that attached to heatsink.

Before I jump to the conclusion, I have a question for you. Click on this photo, and try to find out what's the problem with this Monitor board. What did you see from the photo? You can email me the answer or just wait for my answer on my next coming newsletter.

Intermittent problems can be tough to work on if you do not know the necessary steps to tackle it. Use every information in this article to localize the problem because it is far easier to check and test a few things than to check every joint, contact, and component in the equipment. Have a great hunt my friend!

Electronic Intermittent Problem - The Easy Way To Repair It

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Sunday, October 30, 2011

Flyback agent driver

!: Flyback agent driver

Be aware of that high voltage you don´t saw it but I shorted the sparkgap every time before adjusted!That driver is a nice driver uses the old known ne555 at fixed 50% duty cycle and variable frequency that I set to 16khz.Without output Resistor the spark is horrible loud and pulls a lot of current! Thats why I used a resistor that 125M rated and made for 50kv.

Flyback agent driver

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Thursday, October 20, 2011

What is Electrical Transformer Used For?

!: What is Electrical Transformer Used For?

The electrical energy has become one of the important things in people life. This energy is supplied to all houses and industries. But sometimes voltage fluctuation can cause problems. So to avoid these kinds of problems electrical transformer are installed near your place. Transformer is device which changes current voltage from one circuit to another electric circuit through electromagnetic induction. These are for increasing or decreasing the voltage which comes from substation. There are many varieties of transformers which supplies electricity to houses. Some of the transformers are custom current transformer, high transformer voltage, flyback transformer, electrical transformer, audio, isolation, step up and step down and power transformer.

Electrical transformer:

Switching of voltage from one point to another is known as electrical transformer. These consist of two types of coil conductors known as primary and secondary conductors. These are mainly used for transferring current from power plants to residential and commercial places. Generally it consists of high voltage at the power plant. Now there is a substation between the power plant and residential place. The voltage is reduced a bit when it reaches the substation. Same way the voltage is even more reduced when it reaches to the transformer. This process is repeated till the power comes down to usable level. The current here travels through coils which are covered by core. Now you can find out whether it act at your place gets high voltage or low voltage. Its simple enough, if the transformer has more coils then its high voltage and if it is less then low voltage.

These also have different types of transformer which helps in controlling the voltage level. There are step up electrical device which helps in increasing the voltage level and step down electrical transformer which reduces the voltage level. Generally the houses are run by electricity at limit amount of voltage. The voltage coming from power plant can be either high or low. So for leveling voltage the above transformers are used. These are convenient, efficient and easy way of transferring electric energy to residential and commercial places.

Electric power is used more efficiently than before and therefore, it help in transferring these powers to houses. These transformers can transfer power to far places in easy and efficient manner and they are also cost effective. Now these transformers have become a necessity in people lives. In fact these are inexpensive way of transmitting current all over the world.

Electrical transformers are the most inexpensive but high quality transformer for supplying electricity to houses. The advantage of these device is they store the energy given by a source and then it transfer to the other source. This transformer supplies efficient current to its users at very less and competitive prices.

What is Electrical Transformer Used For?

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Tuesday, October 18, 2011

Hitachi BW00631 FLYBACK TRANSFORMER

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Post Date : Oct 18, 2011 09:21:59 | Usually ships in 1-2 business days

FLYBACK TRANSFORMER HFL1735YP-PC

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Wednesday, April 20, 2011

Things to Know About a Power Transformer

!: Things to Know About a Power Transformer

Basically, a transformer is an electrical device designed to transfer alternating current or voltage from one electric circuit to another by means of electromagnetic induction. The transformer can be designed to step up or step down voltages. The transformers usually have a long and trouble free life since they do not involve any moving parts and is completely static solid state device and work under normal conditions.

The basic model or the simplest type of custom transformers consists of two or more coils of insulated wire wound on a laminated steel core. When voltage is induced to the primary coil, it magnetizes the iron core. In another coil called as the secondary coil the voltage is then induced. This is called as the output coil. The turn ratios of the primary and secondary coils determine the change of voltage between the two coils. They are capable of providing a whole range of voltage sources from the one input coil by using separate windings on the secondary side. Thus the transformers turn out to be the best method for supplying complete systems with all of their voltage requirements from one source.

If you are planning to buy a transformer, three factors should be considered prior to the purchase. You must determine primary voltage and frequency, the required secondary voltage and the capacity required in volt amperes. There is a simple process used to determine the factors. You have to multiply the load current (amperes) by the load voltage for single phase. For example if the load is 40 amperes like in a motor, and the secondary voltage is 240 volts, then 240 multiplied by 40 will give 9600 VA.A 10 KVA (10,000 volt-amperes) transformer is required.

It is better suggested to select the transformer larger than the actual load. This would allow expansion and is meant for safety purposes. If it is 3 phase KVA multiply rated volts x load amps x 1.73 (square root of 3) then divide by 1000. If you are going to design the power distribution for an entire building, then you must select the service transformer and distribution transformer.

It is also important to determine the incoming electric transformers voltage. 50 Hz, 60Hz and 400 Hz are the three common frequencies available. For high powered applications like aerospace technologies, the 400 Hz is reserved. When evaluating transformers, it is also important to consider the secondary power specifications. There are some other specifications that have to be kept in mind while selecting an electric transformer include the maximum ratings of secondary current and voltage rating, power and output rating. According to phase an connections, the power transformers have various configurations. Single phase and three-phase are most commonly used ones. Depending upon the number of primary windings in proportion, both the sizes and expense of electric transformers would increase.

You must also take essential care in the maintenance of the custom transformers. If the transformer has to be located at harsh environments, whether indoors or outdoors; it is important that the core/coil, leads, and Accessories should be adequately protected.

Things to Know About a Power Transformer

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Wednesday, April 6, 2011

Burning Flyback Transformer

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Tuesday, March 29, 2011

Arcing - Broken Laser Tube

!: Arcing - Broken Laser Tube

Arcing from the flyback transformer to the power supply chassis - JSM-40N Laser Engraver. This is the result of a broken laser tube.

Arcing - Broken Laser Tube

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Tuesday, March 22, 2011

Understanding Monitor Flyback Transformers Internal Capacitor

!: Understanding Monitor Flyback Transformers Internal Capacitor

Troubleshooting Monitor flyback transformers is not difficult if you know what is inside the flyback. Normally for a Monitor flyback transformer, it consists of the casing, winding, pins, high voltage cable, anode cap, divider, epoxy and a high voltage capacitor. Among all, the internal capacitor gave the most problems. If this capacitor value out or short circuited, the Monitor will have no high voltage and high voltage shut down and sometimes even blow the power section. That's why, whenever before you want to check any power problems or horizontal out transistor (HOT) that had developed a short circuit; you must always confirm first that the flyback transformer internal capacitor is working. Otherwise, after the replacement of Components, the Monitor would not work or sometimes the same Components that you had changed would blow again.

Although every monitor flyback transformers have different designed, the method of measuring it is the same whether it is a Samsung, Philips, Likom and etc. Connect the digital capacitance probe from the anode cap to the bottom pin as shown in the photo. A good capacitor value should be from 1.5 nanofarad to 4.5 nanofarad. Acer 14 and 15" monitor usually measured 1.5-1.6 nanofarad whereas 17" and above flyback usually in the range of 2.7 nanofarad to 4.5 nanofarad. Some 21" monitor flyback have the reading of 6 nanofarad.

A good dynamic focus capacitor usually has the capacitance value from 0.5 to 1 nanofarad. If these capacitors values run, you may have some problems adjusting the focus. In other words, you just can't tune to a sharp picture no matter how hard you have tried it. You can test these dynamic focus capacitors by connecting a digital capacitance from the horizontal or vertical focus wire to one of the two pins under the flyback divider.

Many monitor repairers tried to fix a flyback transformer without success. Some called it as refurbish flyback. The reason for their failure in repairing the flyback is because of the bleeder resistor inside the flyback. Some technicians called it as feedback resistor. If you just remove the flyback internal capacitor pin and if that flyback have a bleeder resistor in it, the monitor will go into high voltage shutdown mode. Be careful when you want to do refurbishing flyback.

Get Monitor flyback transformers schematic diagram to make you familiar with the Components inside the flyback. See how the internal capacitor and bleeder resistor are connected. How a primary and secondary winding are drawn and get to know the design of different flyback manufacturers as well. In this article I would not show you how to remove flyback transformer because I expect you already knew how to take it out.

Conclusion-Just practice more often on how to test a flyback transformer, and use a dick smith lopt tester to check the winding. It wouldn't take long for you to become very good in checking flyback transformer. By the way, testing the internal capacitor with a digital capacitance is not 100 % accurate because the internal capacitor have the voltage rating of about 30 to 35 kilovolt and the output voltage produced by your meter only in couples of volt. The best flyback transformer tester on earth is actually the Monitor or the TV itself. When you switch on, if the monitor working then the flyback is in good condition and if you heard "tic"-"tic" or arcing sound, most probably you need to check or refurbish the flyback transformer. Have a great day my friend!