Todays article discusses repairing the CMV 19" LCD Monitor problems model CM-922D. The complain wasnt any power as what the customer explained. This power wasnt 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 from the adapter. Since the complain was no power, we must test it out to see if the power adapter is at fault or even the LCD Monitor.
The ac supply was plugged in towards the power adapter and that i often see the ability LED was lighted up. Checking the output voltage of the power adapter I got about 19 volts which is good. Although the LED has lit and correct output voltage, this doesnt imply that the ability 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 in the power adapter however when connected to the Monitor, the display appeared for any fraction of the second before shutting down. Usually in this case, your experienced would tell you just how it could be the inverter circuit are faulty or the lamps have problem. Youd be surprised that the actual cause of the shutdown was because of the power adapter. It cant sustain the output voltage if you find a load on it.
This sort of fault was normally due to a bad filter capacitors located in the creation of the secondary circuit. For those who have ESR meter, it is possible to locate the defective electrolytic capacitors fast. If you dont have the meter, just direct replace the caps. As stated in my previous repair articles, to confirm when the power adapter is truly working or not youll need a light bulb to do something as a load. Ensure the power LED light doesnt blink whenever the light bulb is connected. Even if it blinks one time, this proves the regulation is not good and need to be check entirely. In the above china made LCD Monitor, the ability adapter work perfectly fine!
Since i have have previously confirmed the power adapter is good, my focus now was on the LCD boards. Removing this cover was super easy and you will easily access to the board once the metal casing was removed. First of all , I checked was the SMD fuse found in the main board. When the fuse opens then thered be no supply towards the ADC/SCALAR and the CPU IC thus the ability LED would not light! Checking this SMD fuse was rather simple because the approach to checking it is the same just like a normal fuse. Use either an analog or perhaps 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
Now there is one question that needs to be answered by us. What makes the fuse to go open circuit? Well from what we have known about electronic repair, you will find 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 few years. Quite simply, living of a fuse depends upon the qualities of the materials used. Secondly, the external factor such as a surge causing the fuse to open circuit in order to protect the main board. Thirdly, the primary board itself have problem (such as a shorted ICs and other electronic components) that caused the fuse to open circuit.
If the LCD Monitor problems falls within the first and also the second categories then replacing only the fuse will definitely solve the problem. However, for this LCD Monitor, replacing just the fuse failed at all and the fuse open circuit again. Youve only two options to solve this sort of problem. First you may use another regulated power supply as explained in my previous repair articles and fasten the negative creation of the power supply to ground and also the positive to the fuse (the road that leads with other circuitry) to be able to detect the short circuit. Slowly vary the output voltage and monitor the current drawn. Once the current drawn in regards to a amp or two, now place your finger to any electronic components in the main board. Should you found any components that get very hot then that is the cause of the short circuit.
In the following paragraphs, I will 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 with 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 doesnt blow then the ingredient that have short circuit would blow". Do you get the idea? Three things sometimes happens when you use by doing this to make the culprit. First the ability adapter may shut down due to heavy current tap into the primary board. Second, the short circuit electronic components (be either a IC, diode, capacitors, transistor and etc) will get hot so you can rapidly locate it easily by touching them. Remember dont on it for too much time otherwise if the shorted components get too hot it will go open circuit and you may have difficulty to locate the fault. Third, you may hear a pop sound and spark from the shorted component. Trace from where the spark came from and you can easily identify the place and sometimes towards the actual component that create the spark.
laptop screen repair
For the above LCD Monitor, I actually saw a small spark at the top area of the main board once the power input jack was connected. It prompted me towards 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 developed a slight short circuit. Replacing just the fuse and also the SMD ceramic capacitor solved the 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 are always options regarding which methods that you want to make use of to detect the short circuit. If you prefer the latter one, i quickly suggest you to take some photo shots first before anything really burnt out beyond description. Using the photos, at least it will give you some hints of what the constituents may be or perhaps the part numbers. Well, theres always a fascinating method to solve electronic problems which is one of the reason that I like electronic repair a lot since you can always act as a detective to find out the culprit-real satisfaction! Oh! By the way, you should use the above method to every other electronic equipment and it is not limited simply to problems repair. Have a great hunt my pal!
Todays article discusses repairing the CMV 19" LCD Monitor problems model CM-922D. The complain wasnt any power as what the customer explained. This power supply was not built into the circuit as a result it need an external power adapter to power it up. The input to the LCD Monitor is 19V with 3.1 Amp in the adapter. Since the complain wasnt any power, we have to test drive it to see if the ability adapter is at fault or the LCD Monitor.
The ac supply was connected towards the power adapter and that i could see the power LED was lighted up. Checking the output voltage from the power adapter I acquired about 19 volts which is good. Although the LED has lit and proper output voltage, this doesnt imply that the power adapter can maintain if you find a lot (the LCD Monitor) attached to it. I remember when i came across a Compaq 17" LCD Monitor that have a precise output voltage in the power adapter but when connected to the Monitor, the display appeared for any fraction of the second before closing. Usually in this case, your experienced would tell you just how it could be the inverter circuit are faulty or the lamps have problem. Youd be surprised that the actual cause of the shutdown was because of the power adapter. It cant 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 at the output of the secondary circuit. For those who have ESR meter, it is possible to locate the defective electrolytic capacitors fast. If you dont have the meter, just direct replace the caps. As stated during my previous repair articles, to verify if the power adapter is truly working or otherwise you need a lamp to act like a load. Ensure the power LED light doesnt blink whenever the sunshine bulb is connected. Even when it blinks once, this proves the regulation isnt good and need to be check entirely. Within the above china made LCD Monitor, the ability adapter work perfectly fine!
Since i have have already confirmed the power adapter is good, my focus now was on the LCD boards. Removing this cover was very easy and you will easily accessibility board when the metal casing was removed. The first thing that I checked was the SMD fuse located in the main board. When the fuse opens then thered be no supply towards the ADC/SCALAR and also the CPU IC thus the ability LED would not light! Checking this SMD fuse was relatively easy because the method of checking its the same just like a normal fuse. Use either an analog or perhaps 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 discovered to become open circuit.
lcd monitor repair
There is one question that needs to be answered by us. What makes the fuse to visit open circuit? Well from what we should have known about electronic repair, you will find three possibilities as why a fuse opens circuit. First, the fuse may become open circuit because of its lifespan. Some fuses may last for many years although some only few years. In other words, the life span of the fuse depends on the qualities of the materials used. Secondly, the external factor like a surge causing the fuse to spread out circuit in order to protect the primary board. Thirdly, the primary board itself have problem (like a shorted ICs along with other electronic components) that caused the fuse to spread out circuit.
When the LCD Monitor problems falls within the first and the second categories then replacing just the fuse will definitely solve the problem. However, for this LCD Monitor, replacing only the fuse failed whatsoever and the fuse open circuit again. You have only two choices to solve this sort of problem. First you can use an external regulated power as explained in my previous repair articles and connect the negative creation of the power supply to ground and the positive towards the fuse (the road leading to other circuitry) to be able to detect the short circuit. Slowly vary the output voltage and monitor the present drawn. When the current drawn about a amp or two, now place your finger to the electronic components in the primary board. Should you found any components that will get hot then thats the cause of the short circuit.
In the following paragraphs, Im going to do it differently to detect the short circuit. Are you ready? Now rather than replacing the fuse with the exact rating which is 3 amperes, I replaced it having a 5 amperes fuse. The purpose for me to put the 5 amp fuse instead of the 3 amp fuse was because "if the fuse doesnt blow then your ingredient 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 ability 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 so you can rapidly locate it easily by touching them. Remember dont on it for too long otherwise when the shorted components get too hot itll go open circuit and you may 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 place and sometimes to the actual ingredient that create the spark.
laptop screen repair
For the above LCD Monitor, I actually saw a small spark at the top part of the main board once the power input jack was connected. It prompted me to the exact place and when I look into 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 only the fuse and the SMD ceramic capacitor solved the 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 will always be options regarding which methods that you want to use to detect the short circuit. If you like the latter one, then I suggest you to take some photo shots first before anything really exhausted beyond description. With the photos, at least it will give you some hints of the items the components may be or perhaps the part numbers. Well, theres always a fascinating way to solve electronic problems and this is one of the reason why I like electronic repair so much because you can always behave as a detective to find out the culprit-real satisfaction! Oh! Incidentally, you can use the above mentioned approach to every other electronics and it is not limited only to problems repair. Possess a great hunt my pal!
The ac supply was connected towards the power adapter and that i could see the power LED was lighted up. Checking the output voltage from the power adapter I acquired about 19 volts which is good. Although the LED has lit and proper output voltage, this doesnt imply that the power adapter can maintain if you find a lot (the LCD Monitor) attached to it. I remember when i came across a Compaq 17" LCD Monitor that have a precise output voltage in the power adapter but when connected to the Monitor, the display appeared for any fraction of the second before closing. Usually in this case, your experienced would tell you just how it could be the inverter circuit are faulty or the lamps have problem. Youd be surprised that the actual cause of the shutdown was because of the power adapter. It cant 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 at the output of the secondary circuit. For those who have ESR meter, it is possible to locate the defective electrolytic capacitors fast. If you dont have the meter, just direct replace the caps. As stated during my previous repair articles, to verify if the power adapter is truly working or otherwise you need a lamp to act like a load. Ensure the power LED light doesnt blink whenever the sunshine bulb is connected. Even when it blinks once, this proves the regulation isnt good and need to be check entirely. Within the above china made LCD Monitor, the ability adapter work perfectly fine!
Since i have have already confirmed the power adapter is good, my focus now was on the LCD boards. Removing this cover was very easy and you will easily accessibility board when the metal casing was removed. The first thing that I checked was the SMD fuse located in the main board. When the fuse opens then thered be no supply towards the ADC/SCALAR and also the CPU IC thus the ability LED would not light! Checking this SMD fuse was relatively easy because the method of checking its the same just like a normal fuse. Use either an analog or perhaps 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 discovered to become open circuit.
lcd monitor repair
There is one question that needs to be answered by us. What makes the fuse to visit open circuit? Well from what we should have known about electronic repair, you will find three possibilities as why a fuse opens circuit. First, the fuse may become open circuit because of its lifespan. Some fuses may last for many years although some only few years. In other words, the life span of the fuse depends on the qualities of the materials used. Secondly, the external factor like a surge causing the fuse to spread out circuit in order to protect the primary board. Thirdly, the primary board itself have problem (like a shorted ICs along with other electronic components) that caused the fuse to spread out circuit.
When the LCD Monitor problems falls within the first and the second categories then replacing just the fuse will definitely solve the problem. However, for this LCD Monitor, replacing only the fuse failed whatsoever and the fuse open circuit again. You have only two choices to solve this sort of problem. First you can use an external regulated power as explained in my previous repair articles and connect the negative creation of the power supply to ground and the positive towards the fuse (the road leading to other circuitry) to be able to detect the short circuit. Slowly vary the output voltage and monitor the present drawn. When the current drawn about a amp or two, now place your finger to the electronic components in the primary board. Should you found any components that will get hot then thats the cause of the short circuit.
In the following paragraphs, Im going to do it differently to detect the short circuit. Are you ready? Now rather than replacing the fuse with the exact rating which is 3 amperes, I replaced it having a 5 amperes fuse. The purpose for me to put the 5 amp fuse instead of the 3 amp fuse was because "if the fuse doesnt blow then your ingredient 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 ability 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 so you can rapidly locate it easily by touching them. Remember dont on it for too long otherwise when the shorted components get too hot itll go open circuit and you may 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 place and sometimes to the actual ingredient that create the spark.
laptop screen repair
For the above LCD Monitor, I actually saw a small spark at the top part of the main board once the power input jack was connected. It prompted me to the exact place and when I look into 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 only the fuse and the SMD ceramic capacitor solved the 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 will always be options regarding which methods that you want to use to detect the short circuit. If you like the latter one, then I suggest you to take some photo shots first before anything really exhausted beyond description. With the photos, at least it will give you some hints of the items the components may be or perhaps the part numbers. Well, theres always a fascinating way to solve electronic problems and this is one of the reason why I like electronic repair so much because you can always behave as a detective to find out the culprit-real satisfaction! Oh! Incidentally, you can use the above mentioned approach to every other electronics and it is not limited only to problems repair. Possess a great hunt my pal!