Hello everyone,
I am trying to repair a Samsung Syncmaster 2333SW. I need help in identifying a transformer, finding a replacement, and a couple of questions answered and I am hoping some of forum members will point me in the correct direction. I will post a picture of the CCFL transformer and the schematics of a board that is really close in design to what I am repairing. I cannot find a datasheet on the transformer so I do not know how to find an equivalent if there is such a thing. I am open to any suggestions on identifying this one and possible sources or replacements.
I also have a few capacitor questions that I hope can be easily answered. I apologize if the following questions belong in another thread I am not sure if they will be considered off topic for computer monitor troubleshooting. If these questions are covered elsewhere in this forum I apologize but I could not find them.
First, my only test equipment is a Fluke 26III which does test capacitance. I know I need more tools, hopefully I will have them in the future, but for now I have to make due.
Why would a capacitor test at a much higher capacitance than what it is rated? I sometimes find electrolytic capacitors that do this but almost all the solid capacitors test at double their rating. I do not think it is the meter because new capacitors test in spec and this meter is regularly calibrated to ISO standards. (I borrow it from work when I need it.)
I understand that to truly test a capacitor it must be removed from the circuit and an ESR meter should be involved. With that being said, when I start troubleshooting I like to test the capacitance on the different power busses to get an idea of what the board is “seeing”. Usually what I get is basically the sum capacitance of all the capacitors in parallel. Unless I see something physically wrong with these capacitors I usually will not bother with them. Sometimes I get no capacitance reading without the bus being shorted, does this mean that one or more of the parallel capacitors are bad or does it point to another component being bad or is it 50/50? In this same testing scenario I sometimes get readings that vary greatly, for example the reading goes from 600uF to 1100uF and back every few seconds and will not stabilize. Does this indicate bad capacitors or is it most likely caused by other devices in the circuit? (Trying to test this way may be wrong, but I want to avoid “fixing” or removing something that is not broken if possible.)
I will grateful for any assistance, pointers or links that can be provided. I will be more than willing to answer any questions. I also want to say I really love all the great information on this site as it has helped me learn a lot and fix some things that would have went into the landfill.
schematicsl.pdf
I am trying to repair a Samsung Syncmaster 2333SW. I need help in identifying a transformer, finding a replacement, and a couple of questions answered and I am hoping some of forum members will point me in the correct direction. I will post a picture of the CCFL transformer and the schematics of a board that is really close in design to what I am repairing. I cannot find a datasheet on the transformer so I do not know how to find an equivalent if there is such a thing. I am open to any suggestions on identifying this one and possible sources or replacements.
I also have a few capacitor questions that I hope can be easily answered. I apologize if the following questions belong in another thread I am not sure if they will be considered off topic for computer monitor troubleshooting. If these questions are covered elsewhere in this forum I apologize but I could not find them.
First, my only test equipment is a Fluke 26III which does test capacitance. I know I need more tools, hopefully I will have them in the future, but for now I have to make due.
Why would a capacitor test at a much higher capacitance than what it is rated? I sometimes find electrolytic capacitors that do this but almost all the solid capacitors test at double their rating. I do not think it is the meter because new capacitors test in spec and this meter is regularly calibrated to ISO standards. (I borrow it from work when I need it.)
I understand that to truly test a capacitor it must be removed from the circuit and an ESR meter should be involved. With that being said, when I start troubleshooting I like to test the capacitance on the different power busses to get an idea of what the board is “seeing”. Usually what I get is basically the sum capacitance of all the capacitors in parallel. Unless I see something physically wrong with these capacitors I usually will not bother with them. Sometimes I get no capacitance reading without the bus being shorted, does this mean that one or more of the parallel capacitors are bad or does it point to another component being bad or is it 50/50? In this same testing scenario I sometimes get readings that vary greatly, for example the reading goes from 600uF to 1100uF and back every few seconds and will not stabilize. Does this indicate bad capacitors or is it most likely caused by other devices in the circuit? (Trying to test this way may be wrong, but I want to avoid “fixing” or removing something that is not broken if possible.)
I will grateful for any assistance, pointers or links that can be provided. I will be more than willing to answer any questions. I also want to say I really love all the great information on this site as it has helped me learn a lot and fix some things that would have went into the landfill.
schematicsl.pdf
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