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Archive for the ‘Living With Hardware’ Category

K-Designers continues to build on their 30-plus years of design knowledge with eleven locations in the Western United States. Starting with their first location in Laramie, Wyoming and up through to today, K-Designers offers a full complement of home renovation services. When it comes to home remodeling, K-Designers commitment is to consumer satisfaction.

K-Designers offers a full accompaniment of products and services. For exterior siding, K-Designers offer premium wares that provide proper exterior coverage. This includes vinyl, aluminum, and steel building products. They provide a full line of custom windows in long-lasting, durable vinyl. They even sell and install custom-made windows with a lifetime warranty.

In addition to the wide array of design options shown to every customer, K-Designers furnish other such particulars as exterior window and door decor. They use providers known for maintaining a wide range of color, style, and size alternatives in decorative exterior building products and siding supplements including shutters, headers, and other decorative accessories.

They also offers consumers a full range of storm doors. This class of storm doors have aluminum frame doors with maintenance-free finishes. They also offer high-impact-resistant solid wood-core doors, which also have solid brass interior and exterior handles with built-in deadbolt security mechanisms. These are just a couple of representatives of the many product lines that K-Designers has to offer.

They have certain rules for craftspeople which they employ. They must be experienced, professional, friendly, and have the ability to pay shewd attention to detail. With a perpetual commitment to yielding their clients high quality materials, K-Designers use merchandise from premier providers. They also sort applicants cautiously before their qualified craftspeople perform work on any customers’ home.

Years of experience in the home remodeling industry aid K-Designers to serve their clients better. Their expert design staff and trade professionals are the anchor of the Company, as are the quality products they source from reputable providers. The Company measures their success by the number of satisfied customers they service each year.

Electronic test equipment, commonly called testgear, is equipment that is used to create stimulating signals and capture the responses from electronic devices under test. These devices are knowns as DUTS, Devices Under Test. Given this controls it is possible to prove the proper operation of a device through these tests, and deem them as being needed of repair or not.

Electronic test equipment is an essential element to any major electronics system. Ranging from a simple light bulb to expense and even automated tasks, electronic test equipment covers a very large range. In general it can be said that when developing electronic systems that more advanced equipment is needed opposed to when doing routine production testing on existing systems in the field. This rule is not always however true, because every system is different.

Some examples of test equipment are: Ammeter, Voltmeter (Measures voltage), Multimeter (Measures all of the above), Oscilloscope (Measures all of the above as they change over time), Frequency counter (Measures frequency).

In the past, it used to be that tests would have to be initiated by some type of man given command, through a controller or other. With the level of technology present today, the majority of testing is done automatically through the use of computers, either continuously or at given increments. This automation of testing greatly led to an increase in production and in reliability of electronic systems as they almost have the ability to monitor themselves and know when something is going wrong.

Feel free to reprint this article as long as you keep the article, this caption and author biography in tact with all hyperlinks.

Ryan Fyfe is the owner and operator of Cheap Used Test Equipment – http://www.cheap-used-test-equipment.com, which is the best site on the internet for all used test equipment related information.

Nowadays, more and more monitor comes in with flyback transformers problems. Testing flyback transformers arenot difficult if you carefully follow the instruction. In many cases, the flyback transformer can become short circuit after using not more than 2 years. This is partly due to bad design and low quality materials used during manufactures flyback transformer. The question is what kind of problems can be found in a flyback transformer and how to test and when to replace it. Here is an explanation that will help you to identify many flyback transformer problems.

There are nine common problems can be found in a flyback transformer:

a) A shorted turned in the primary winding.

b) An open or shorted internal capacitor in secondary section.

c) Flyback Transformer becomes bulged or cracked.

d) External arcing to ground.

e) Internal arcing between windings.

f) Shorted internal high voltage diode in secondary winding.

g) Breakdown in focus / screen voltage divider causing blur display.

h) Flyback Transformer breakdown at full operating voltage (breakdown when under load).

i) Short circuit between primary and secondary winding.

Testing flyback transformer will be base on (a) and (b) since problem (c) is visible while problem
(d) and (e) can be detected by hearing the arcing sound generated by the flyback transformer. Problem
(f) can be checked with multimeter set to the highest range measured from anode to ABL pin while (g)
can be solved by adding a new monitor blur buster (For 14′ & 15′ monitor only.) Problem (h) can only be
tested by substituting a known good similar Flyback Transformer. Different monitor have different type
of flyback transformer design. Problem (i) can be checked using an ohm meter measuring between primary
and secondary winding. A shorted turned or open in secondary winding is very uncommon.

What type of symptoms will appear if there is a shorted turned in primary winding?

a) No display (No high voltage).

b) Power blink.

c) B+ voltage drop.

d) Horizontal output transistor will get very hot and later become shorted.

e) Along B+ line components will spoilt. Example:- secondary diode UF5404 and B+ FET IRF630.

f) Sometimes it will cause the power section to blow.

What type of symptoms will appear if a capacitor is open or shorted in a flyback transformer?

Capacitor shorted

a. No display (No high voltage).

b. B+ voltage drop.

c. Secondary diode (UF5404) will burned or shorted.

d. Horizontal output transistor will get shorted.

e. Power blink.

f. Sometimes power section will blow, for example: Raffles 15 inch monitor.

g. Power section shut down for example: Compaq V55, Samtron 4bi monitor.

h. Sometimes the automatic brightness limiter (ABL) circuitry components will get burned.

This circuit is usually located beside the flyback transformer. For example: LG520si

Capacitor open

a. High voltage shut down.

b. Monitor will have ‘tic – tic’ sound. Sometimes the capacitor may measure O.K. but break down when under full operating voltage.

c. Horizontal output transistor will blow in a few hours or days after you have replaced it.

d. Sometimes it will cause intermittent “no display”.

e. Distorted display i.e., the display will go in and out.

f. It will cause horizontal output transistor to become shorted and blow the power section.

How to check if a primary winding is good or bad in a Flyback Transformer?

a) By using a flyback/LOPT tester, this instrument identifies faults in primary winding by doing a ‘ring’ test.

b) It can test the winding even with only one shorted turned.

c) This meter is handy and easy to use.

d) Just simply connect the probe to primary winding.

e) The readout is a clear ‘bar graph’ display which show you if the flyback transformer primary winding is
good or shorted.

f) The LOPT Tester also can be used to check the CRT YOKE coil, B+ coil and switch mode power transformer
winding.

NOTE: Measuring the resistance winding of a flyback transformer, yoke coil, B+ coil and SMPS winding using a
multimeter can MISLEAD a technician into believing that a shorted winding is good. This can waste his precious
time and time is money.

How to diagnose if the internal capacitor is open or shorted?
By using a normal analog multimeter and a digital capacitance meter. A good capacitor have the range
from 1.5 nanofarad to 3 nanofarad.*

1) First set your multimeter to X10K range.

2) Place your probe to anode and cold ground.

3) You must remove the anode cap in order to get a precise reading.

4) Cold ground means the monitor chassis ground.

5) If the needle of the multimeter shows a low ohms reading, this mean the internal capacitor is shorted.

6) If the needle does not move at all, this doesn’t mean that the capacitor is O.K.

7) You have to confirm this by using a digital capacitance meter which you can easily get one from local
distributor.

If the reading from the digital capacitance meter shows 2.7nf, this mean the capacitor is within range (O.K.).

9) And if the reading showed 0.3nf, this mean the capacitor is open.

10) You have three options if the capacitor is open or shorted.

- Install a new flyback transformer or

- Send the flyback transformer for refurbishing or

- Send the monitor back to customers after spending many hours and much effort on it.

* However certain monitors may have the value of 4.5nf, 6nf and 7.2nf.
Note: Sometimes the internal capacitor pin is connected to circuits (feedback) instead of ground.

Tv rca flyback transformer circuits usually do not have a internal capacitor in it.

If you have a flyback diagram and circuits which you can get it from the net, that would be an advantage
to easily understand how to check them.

Jestine Yong is a electronic repairer and a writer. For more electronic repair articles please visit his website at http://www.noahtec.com/electronic-repair-articles.htm

Internet addresses that are tainted by crime and are practically like ghost towns now – totally deserted and are haunted forever. It’s a case of gothic high tech.

A year ago, the internet community witnessed the unplugging of McColo, a web host based in Northern California. For the longest time, the facility controlled a huge part of the spamming operations in the world. McColo’s main ISPs abruptly pulled the plug on them after Security Fix came out with evidence that tied massive amounts of spam and other illicit online activity to the network run by McColo.

Of course, this led to the reduction of spam traffic in cyberspace. But it also meant that a huge part of the virtual real estate that once used by McColo is now eerily quiet – like cyberspace ghost town. Empty domains without hosting services.
More than 3,000 internet addresses are now practically empty and are unable to attract new occupants. It’s as if some sort of toxic sludge has been thrown over the address blocks that no one would dare use them anymore.

This could be true. After all, the online community frowns on networks that harbour spammers as well as on organizations that host malware and other bad things, listing their numeric internet addresses in block lists. A lot of organizations usually configure their email servers to keep away communications coming from addresses on block lists and a heavily blocked network becomes an unattractive prospect to legitimate businesses because there’s no way that they can send email from those addresses and get favourable reception.
To make matters worse, once an address gets onto a block list, it’s next to impossible to get it off on all those lists because of the absence of a central blocking authority. While the space wouldn’t be tainted forever, it will carry the stigma of illicit activity.