Myads
Submitted by Planewalker (not verified) on Wed, 10/06/2010 - 02:37.
You cannot be assured that just looking at a capacitor will tell you if it is bad or not. Capacitors can *definitely* go bad and show no visual signs of it. Capacitors can fuse inside or slowly leak power, and still look fine.
My advice is if an LCD isn't working, just try replacing ALL the electrolytic capacitors on the power board with ones of the same microfarad rating and equal or higher voltage.
The voltage rating determines how many volts the capacitor can *handle* in terms of input, not how much it outputs! So it's fine to go over because whatever the capacitor is powering will draw however many volts it needs from the capacitor, so a higher voltage rating actually helps make the capacitor last longer.
However, if the voltage rating is far higher than the rating of the capacitor you are replacing, it can get really hot from holding too much charge, and might melt other components on the circuit board. Electronics are designed to get only so hot. Moreover, it may not fit on the board! So make sure you bring the board in to your Radio Shack and visually inspect the new capacitors to make sure they will fit. A good rule of thumb is not to exceed 2x the voltage rating of the capacitor you are replacing.
My advice is if an LCD isn't working, just try replacing ALL the electrolytic capacitors on the power board with ones of the same microfarad rating and equal or higher voltage.
The voltage rating determines how many volts the capacitor can *handle* in terms of input, not how much it outputs! So it's fine to go over because whatever the capacitor is powering will draw however many volts it needs from the capacitor, so a higher voltage rating actually helps make the capacitor last longer.
However, if the voltage rating is far higher than the rating of the capacitor you are replacing, it can get really hot from holding too much charge, and might melt other components on the circuit board. Electronics are designed to get only so hot. Moreover, it may not fit on the board! So make sure you bring the board in to your Radio Shack and visually inspect the new capacitors to make sure they will fit. A good rule of thumb is not to exceed 2x the voltage rating of the capacitor you are replacing.
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