Samsung 153V LCD Monitor Power Supply Repair Tips

!±8± Samsung 153V LCD Monitor Power Supply Repair Tips

Troubleshooting Samsung 153V LCD power supply is just like troubleshooting those crt type. This monitor came in with no power symptom. If you are first time repairing this type of power supply, I recommend you to first remove the switch mode power transformer. Then test every single component in the primary section, before you continue to check the secondary section. You have to be good in testing basic electronic components in order to detect the fault.

You can always browse through my website just in case you do not know how to test basic electronic components. If you do not know the right way to check, you might miss out a bad component and this will lead you not able to solve the problem. After carefully checking all the components in the power supply section, I found the filter capacitor do not have any reading using digital capacitance meter (open) , the two round type fuse also open circuit, 1N4744 15 Volt zener diode short circuit and lastly the power ic TOP247F blown! Testing the switch mode power supply primary winding with a dick smith flyback tester shown green bar which indicated good winding.

What we left here were the secondary diode and filter capacitor. Upon checking them with analog meter and esr meter, found all of them to be good condition. Other area like main board and inverter board also looks okay (Power failure rarely affect these two circuit). Now we have confirmed that only five components found to be faulty. One by one the components were replaced (except one fuse) and just before you switch on the power supply, make sure you connect a 100 watt light bulb across the live ac line-refer to the photo at my website. Once it is done you can then proceed to switch on the LCD monitor to look at the brightness of the bulb.

If it very bright, this suggests that there are still short circuit somewhere in the power section. If it dim or totally goes off, you can now place your red probe to the secondary side to check if any dc present at their respective line. If there are DC voltages present at the output, you can switch off the power, discharge the filter capacitor (for safety purposes), remove the light bulb and connect back the new fuse to its original location.

You are now hundred percent sure that the LCD power supply won't blow once you switch it on. By the way the filter capacitor is rated at 105 Celsius and you cannot replace it with the 85 Celsius type otherwise it may open up again after using for couple of weeks or months. The ventilation in LCD monitor is not as good as the cathode ray tube monitor, because the power supply is fully covered by a large aluminum plate and it can get hot pretty fast. Conclusion, whether you are repairing Samsung 153V LCD power supply or other brand of LCD monitor, the procedure is the same. Who knows the power problem in this monitor is a common fault and in the future you can tackle this brand of power supply in the shortest time. To measure electronic components is not that difficult, but to get the original parts like the power ic will consume you lots of time.

Samsung 153V LCD Monitor Power Supply Repair Tips

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Computer Monitor Flyback Transformer - Replacement and Substitution

!±8± Computer Monitor Flyback Transformer - Replacement and Substitution

The Computer Monitor flyback transformer comes with many types of parts number, designed and inductance winding values. Although some may have different part numbers, they can be use d to substitue on another model of monitor! The Monitor flyback transformer is manufactures by many different manufacturers thus many different kinds of part numbers are produced. If you know exactly the winding value of each flyback transformer then it is easy for you find a replacement.

One good example is the Samsung Samtron flyback transformer with a part number of FKD15A001 and it is the same as FKG15A001. Another good part number is the Acer monitor-19.00026 which is same as 19.00038. In order to find out whether a particular flyback transformer can be replace with another part number or even with another brand of flyback transformer is to use an inductance meter. It is compulsory to have one.

Normally a monitor flyback transformer have few pins which are important such as the B plus (+) pin, horizontal collector pulse pin, G1, AFC (automatic frequency control), X-RAY PROTECTION pin, ABL (automatic blanking limiter), ground, and horizontal centering pin. If you want 100% sure that the substitute flyback transformer can work for your computer monitor, you must first calculate the inductance values for each winding such as what is the primary winding inductance value, between ground to AFC and ground to G1.

The winding tolerances should be around 5-10 percent and please make sure you know which pin you are measuring. Let's say the original flyback primary winding (B+ pin and collector pulse pin) have a inductance value of 1.5 milihenry then the substitution flyback should have a value between 1.45 to 1.65 milihenry. If the winding inductance value is too high or too low, it will caused the monitor horizontal size display to becomes too big or too small horizontally and even can burn the Horizontal output transistor (HOT) in a very short time.

Your next try is to find out the value of Ground to G1, Ground to AFC and so on. If you want to find out the ABL pin you can always refer to my electronic repair website which is at the bottom of this article. Owning a flyback transformer schematic or circuit diagram is the best way to find the correct pins. If you don't have the information then you have to find the pin with the help of inductance meter. Sometimes, searching the Internet will help you get the flyback schematic.

It might take you a lot of time to understand the art of testing the inductance value of flyback but the time you have spend is well worth and who knows one day you can find the right replacement of monitor flyback transformer even without the help of a flyback transformer cross reference schematic. One last word, whether it is a Imac, Hitachi, Sony, Rca TV, or any type of flyback transformer, the ways of finding the replacement is the same. It just needs hard work such as study the some flyback schematic diagram and begin to practice with the help of your inductance meter.

Computer Monitor Flyback Transformer - Replacement and Substitution

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