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.
Unlike a plasma television that offers the danger of burn-in, you can learn how to use you LCD TV as a video monitor. It makes for a clear and crisp picture to go with yoru computer or video games. The versatility of an LCD TV is perhaps what makes it most attractive to many buyers. A few tips on how to use your LCD TV as a video monitor will help you see just how great an LCD television can be in your home.LCD screens actually have their roots in computer monitors. The wild success of LCD computer screens has led to the development of larger screens to use as television sets. Many of the characteristics are the same, but in order to compete with plasma, the televisions have actually developed higher quality pictures in the last couple of years.
A word of advice, though: if you are planning to use your LCD just as a computer screen, consider actually buying an LCD monitor. If you do not, you will end up paying for a tuner, AV inputs, and other television features that you don't need. On the other hand, if you are gaming on your LCD screen, a big 30 inch screen can be impressive when you show it off to your gaming buddies.
The first step in learning how to use your LCD TV as a video monitor is making sure you have the right television. In order to make the switch from TV viewing to monitor for your computer or games, your television needs to have a VGA or other options for connection to a PC or gaming system. If it does not, then you are going to be very disappointed.
Make sure your computer is near your LCD television. You do not want to have to run cables and wires all over the house to accommodate your computer usage. Additionally, it needs to be close enough that your view of the monitor will actually be reasonable when using the computer. You would be surprised at how many people say they want to use the LCD screen for their computer monitor, but forget to put the computer near the television.
Next, in learning how to use your LCD TV as a video monitor, you need to make sure you have all wires and cables run that you need so you can switch easily. Run cables through the walls or conduit to both your computer and the cable input for your home. That way when you decide to switch your LCD screen between television and computer use it will be smooth. If you are really savvy, you can also set it up so that a switch or channel change will move you from computer or video monitor to television screen without a lot of work.
Learning how to use your LCD TV as a video monitor is valuable. Since the picture is so clear and well contrasted, you will reduce eye fatigue and squinting headaches brought about by traditional monitors. Just make sure you have the right television and are prepared. Then, you will be all set for dual use of your LCD TV.
