Today's article discusses repairing the CMV 19" LCD Monitor problems model CM-922D. The complain was no power as exactly what the customer told me. This power was not built into the circuit thus it need an external power adapter to power up. The input towards the LCD Monitor is 19V with 3.1 Amp in the adapter. Because the complain wasn't any power, we have to test drive it to check if the power adapter is at fault or even the LCD Monitor.

The ac supply was connected towards the power adapter and that i could see the ability LED was lighted up. Checking the output voltage of the power adapter I got about 19 volts that is good. Although the LED has lit and correct output voltage, it doesn't imply that the power adapter can maintain if you find a lot (the LCD Monitor) attached to it. I once came across a Compaq 17" LCD Monitor which have a precise output voltage from the power adapter however when connected to the Monitor, the display appeared for any fraction of a second before closing. Usually in this case, your experienced would tell you just how it may be the inverter circuit are faulty or even the lamps have problem. You would be surprised the actual cause of the shutdown was because of the power adapter. It can't sustain the output voltage when there is a load on it.

This sort of fault was normally due to a bad filter capacitors located at the output of the secondary circuit. If you have ESR meter, it is possible to locate the defective electrolytic capacitors fast. Without having the meter, just direct replace the caps. As mentioned in my previous repair articles, to verify if the power adapter is truly working or otherwise you need a light bulb to do something like a load. Ensure the power LED light doesn't blink whenever the sunshine bulb is connected. Even when it blinks once, this proves the regulation is not good and want to become check entirely. In the above china made LCD Monitor, the ability adapter work perfectly fine!

Since i have have previously confirmed that the power adapter is nice, my focus now was on the LCD boards. Removing this cover was very easy and you can easily accessibility board when the metal casing was removed. The first thing that I checked was the SMD fuse found in the main board. If the fuse opens then there would be no supply towards the ADC/SCALAR and also the CPU IC thus the ability LED wouldn't light! Checking this SMD fuse was rather simple as the approach to checking it is the same just like a normal fuse. Use either an analog or a digital meter set to ohms range or continuity check. You should check the fuse even though it is still in circuit. Yes, the fuse was found to become open circuit.

lcd monitor repair

There is one question that should be answered by us. What makes the fuse to go open circuit? Well from what we should have known about electronic repair, there are three possibilities as why a fuse opens circuit. First, the fuse can become open circuit because of its lifespan. Some fuses can last for a long time while some only couple of years. In other words, living of the fuse depends on the qualities from the materials used. Secondly, the external factor such as a surge resulting in the fuse to open circuit in order to protect the primary board. Thirdly, the primary board itself have problem (like a shorted IC's and other electronic components) that caused the fuse to open circuit.

If the LCD Monitor problems falls in the first and the second categories then replacing only the fuse will certainly solve the problem. However, with this LCD Monitor, replacing only the fuse failed at all and the fuse open circuit again. You have only two choices to solve this sort of problem. First you may use an external regulated power supply as explained in my previous repair articles and fasten the negative output of the power supply to ground and the positive towards the fuse (the line that leads to other circuitry) to be able to detect the short circuit. Slowly vary the output voltage and monitor the current drawn. When the current drawn in regards to a amp or two, now place your finger to any electronic components in the primary board. If you found any components that will get very hot then that's the cause of the short circuit.

In this article, I'm going to do it differently to detect the short circuit. Are you ready? Now rather than replacing the fuse with the exact rating that is 3 amperes, I replaced it having a 5 amperes fuse. The reason for me to put the 5 amp fuse instead of the 3 amp fuse was because "if the fuse doesn't blow then your ingredient that have short circuit would blow". Do you get the idea? Three things can happen if you use by doing this to force the culprit. First the power adapter may turn off because of heavy current draw from the primary board. Second, the short circuit electronic components (be either a IC, diode, capacitors, transistor and etc) can get hot so you can rapidly locate it easily by touching them. Remember don't on it for too long otherwise if the shorted components get too hot it'll go open circuit and now you will have a hard time to discover the fault. Third, you might hear a pop sound and spark from the shorted component. Trace where the spark came from and you can easily identify the place and sometimes to the actual ingredient that generate the spark.

laptop screen repair

For the above LCD Monitor, I personally saw a little spark at the top area of the main board once the power input jack was connected. It prompted me to the exact place and when I check the SMD ceramic capacitor (that generated the spark beneath it) with analog meter set to X 10 K ohm range; it actually created a slight short circuit. Replacing only the fuse and the SMD ceramic capacitor solved no power problem in this 19" LCD Monitor. This Monitor uses the inverter IC (OZ960G), A1084-25CM (2.5 volts voltage regulator), AMC1117-3.3 (3.3 volts voltage regulator), ADC IC (MST8136B) and CPU IC (MYSON MTV312MV64).

Conclusion-There will always be options as to which methods that you would like to make use of to detect the short circuit. If you like the latter one, then I suggest you to definitely try taking some photo shots first before anything really burnt out beyond description. With the photos, a minimum of it will give you some hints of the items the components may be or even the part numbers. Well, almost always there is an interesting method to solve electronic problems and this is one of the reason that I like electronic repair a lot since you can always behave as a detective to discover the culprit-real satisfaction! Oh! Incidentally, you can use the above mentioned approach to any other electronic equipment and it is not limited simply to problems repair. Possess a great hunt my pal!

Today's article discusses repairing the CMV 19" LCD Monitor problems model CM-922D. The complain was no power as what the customer explained. This power supply was not built into the circuit thus it need another power adapter to power up. The input to the LCD Monitor is 19V with 3.1 Amp from the adapter. Since the complain was no power, we must test it to see if the power adapter is at fault or even the LCD Monitor.

The ac supply was connected towards the power adapter and that i often see the ability LED was lighted up. Checking the output voltage from the power adapter I got about 19 volts that is good. Even though the LED has lit and correct output voltage, this doesn't imply that the ability adapter can maintain if you find a lot (the LCD Monitor) connected to it. I once came across a Compaq 17" LCD Monitor which have an exact output voltage in the power adapter but when attached to the Monitor, the display appeared for any fraction of the second before shutting down. Usually in this instance, your experienced would tell you just how it may be the inverter circuit are faulty or the lamps have problem. You'd be surprised that the actual cause of the shutdown was because of the power adapter. It can't sustain the output voltage if you find a lot onto it.

This kind of fault was normally as a result of bad filter capacitors located in the creation of the secondary circuit. If you have ESR meter, you can actually locate the defective electrolytic capacitors fast. Without having the meter, just direct replace the caps. As stated in my previous repair articles, to confirm if the power adapter is truly working or otherwise you need a light bulb to act as a load. Ensure the power LED light doesn't blink whenever the sunshine bulb is connected. Even if it blinks one time, this proves the regulation is not good and need to become check entirely. In the above china made LCD Monitor, the power adapter work perfectly fine!

Since I have already confirmed that the power adapter is good, my focus now was around the LCD boards. Removing this cover was super easy and you will easily accessibility board once the metal casing was removed. First of all , I checked was the SMD fuse located in the main board. If the fuse opens then there would be no supply to the ADC/SCALAR and also the CPU IC thus the ability LED wouldn't light! Checking this SMD fuse was rather simple as the method of checking it is the same like a normal fuse. Use either an analog or a digital meter set to ohms range or continuity check. You can check the fuse while it is still in circuit. Yes, the fuse was discovered to be open circuit.

lcd monitor repair

There is one question that should be answered by us. What makes the fuse to go open circuit? Well from what we should have known about electronic repair, there are three possibilities as why a fuse opens circuit. First, the fuse may become open circuit due to its lifespan. Some fuses may last for a long time while some only few years. In other words, the life span of a fuse depends on the qualities from the materials used. Secondly, the external factor such as a surge causing the fuse to spread out circuit in order to protect the primary board. Thirdly, the main board itself have problem (such as a shorted IC's and other electronic components) that caused the fuse to spread out circuit.

When the LCD Monitor problems falls in the first and the second categories then replacing just the fuse will certainly solve the problem. However, for this LCD Monitor, replacing just the fuse failed whatsoever and the fuse open circuit again. You have only two choices to solve this kind of problem. First you can use an external regulated power supply as explained during my previous repair articles and connect the negative output of the power supply to ground and the positive to the fuse (the line leading to other circuitry) to be able to detect the short circuit. Slowly vary the output voltage and monitor the present drawn. Once the current drawn about a amp or two, now place your finger to the electronic components in the main board. If you found any components that get hot then that is the cause of the short circuit.

In this article, I'm going to get it done differently to detect the short circuit. Isn't it time? Now rather than replacing the fuse using the exact rating that is 3 amperes, I replaced it with a 5 amperes fuse. The reason for me to place the 5 amp fuse instead of the 3 amp fuse was because "if the fuse doesn't blow then the component that have short circuit would blow". Do you get the idea? Three things sometimes happens if you use by doing this to make the culprit. First the power adapter may shut down due to heavy current tap into the primary board. Second, the short circuit electronic components (either be a IC, diode, capacitors, transistor and etc) will get hot and you can quickly locate it easily by touching them. Remember don't onto it for too much time otherwise when the shorted components get too hot it'll go open circuit and now you will have a hard time to discover the fault. Third, you might hear a pop sound and spark in the shorted component. Trace where the spark originated from and you can easily identify the location and sometimes towards the actual component that generate the spark.

laptop screen repair

For the above LCD Monitor, I personally saw a little spark at the top area of the main board once the power input jack was connected. It prompted me to the exact place so when I check the SMD ceramic capacitor (that generated the spark beneath it) with analog meter set to X 10 K ohm range; it really developed a slight short circuit. Replacing just the fuse and also the SMD ceramic capacitor solved no power condition in this 19" LCD Monitor. This Monitor uses the inverter IC (OZ960G), A1084-25CM (2.5 volts voltage regulator), AMC1117-3.3 (3.3 volts voltage regulator), ADC IC (MST8136B) and CPU IC (MYSON MTV312MV64).

Conclusion-There are always options as to which methods that you would like to use to detect the short circuit. If you like the latter one, then I suggest you to definitely take some photo shots first before anything really burnt out beyond description. Using the photos, a minimum of you'll have some hints of what the constituents may be or even the part numbers. Well, almost always there is an interesting way to solve electronic problems and this is one of the reason that I love electronic repair so much because you can always act as a detective to discover the culprit-real satisfaction! Oh! By the way, you should use the above approach to any other electronic equipment and it is not limited only to problems repair. Possess a great hunt my pal!