| Electronics > Beginners |
| ESR Testing and "in-circuit" -- Please explain |
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| crosis:
I'm looking to repair my Dell E2210f monitor. The monitor turns on fine but the brightness is very dim. I will assume it is a bad capacitor. On visual inspection i see nothing wrong on the power supply board or the other board. From YT videos it seems i will need an ESR Tester not a Capacitor tester; planning on purchasing this one https://www.amazon.ca/gp/product/B0779D67SB/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1. What i dont understand is they keep saying i can do the test in-circuit. Does this mean i should perform the capacitor test WHILE the monitor is powered on and active or does this mean to perform the test when there is no power but the capacitor is still within the circuit board? I'm still total sh** at soldering/desoldering so if this magic ESR tester you guys speak of can help me conclusively identify a bad capacitor that will really save me the headache. BTW what can a Capacitor Tester do which the ESR Tester cannot? One person mentioned having both but everytime i read people saying to get the ESR implying the Capacitor tester is pointless. Is the Capacitor Tester poor man's ESR? Why would anyone have both? Thanks |
| sokoloff:
--- Quote from: crosis on October 30, 2018, 11:59:45 pm ---I'm looking to repair my Dell E2210f monitor. The monitor turns on fine but the brightness is very dim. I will assume it is a bad capacitor. On visual inspection i see nothing wrong on the power supply board or the other board. From YT videos it seems i will need an ESR Tester not a Capacitor tester; planning on purchasing this one https://www.amazon.ca/gp/product/B0779D67SB/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1. What i dont understand is they keep saying i can do the test in-circuit. Does this mean i should perform the capacitor test WHILE the monitor is powered on and active or does this mean to perform the test when there is no power but the capacitor is still within the circuit board? --- End quote --- The latter for sure!! --- Quote from: crosis on October 30, 2018, 11:59:45 pm ---I'm still total sh** at soldering/desoldering so if this magic ESR tester you guys speak of can help me conclusively identify a bad capacitor that will really save me the headache. BTW what can a Capacitor Tester do which the ESR Tester cannot? One person mentioned having both but everytime i read people saying to get the ESR implying the Capacitor tester is pointless. Is the Capacitor Tester poor man's ESR? Why would anyone have both? --- End quote --- Because it's another tool/meter/gadget is a good enough reason... :-// ESR testing is more suited to finding "bad caps". You still may want to know the capacitance value of a cap, which an ESR meter will not tell you. |
| crosis:
Thanks, sokoloff. Good response. For the record i just found Dave's ESR video too: |
| RobertHolcombe:
Just to clarify, the instruction would read "perform measurement while circuit is live" or something to that effect, if the device needed to be powered-on during measurement |
| MosherIV:
--- Quote --- I'm looking to repair my Dell E2210f monitor. The monitor turns on fine but the brightness is very dim. --- End quote --- Hi. It is unlikely to be bad capacitors from your desription of what is wrong. It is more likely to be the EL or flourescent back light tubes are going bad. You can get LED replacement kits. Look on ebay. |
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