• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

capacitor question lg246

W

weg

n00b
Joined
Nov 7, 2011
Messages
1
hi all newbe here:weg aka billg:need little help?? i have a lg l246wp-bn monitor.which dose not come on;how ever the computer sees the monitor.finaly got the back off and got the power supply out the 2-3300@10v capc are poped. i have 4700 mfd @35v but not the recomended 3300/16v>would the 4700 work:in my past experance for power supply rep in poweramps you can go up in capacitance and voltage but not down>not sure about switching supplys in monitors..any suggestions.thanks have a great billg-audiolabs
 
Without knowing anything about the circuit, I can't say for sure. On voltage, you're correct: you can replace with a part that's rated for a higher voltage, but not a lower one. On capacitance, you're making an assumption that may or may not be true: that the capacitance can be increased without having an effect on the circuit.

If I were you, I would get some capacitors with the correct capacitance value and a voltage rating at or above 16v. Places like Mouser and Digikey are great for this (though for a few small capacitors, you'll pay more for shipping than the actual part unfortunately).
 
Generally the big caps in a power supply are there for smoothing.

A bigger capacitor will produce a cleaner output. However it will also make the PSU slower to start (since the larger caps will need to be charged). This can sometimes be an issue depending on the design of the circuit being powered and in extreme cases it could even cause the PSU to trip out before successfully starting.

My educated guess is it will probablly be fine but I can't say for sure and given that every time you swap a part you risk damaging the board I would say it's worth buying the correct capacitors and buying from a reputable brand.
 
Depends what the caps are for. Many circuits rely on specific capacitance values... Others, such as power smoothing, do not. Could be for an oscillation circuit, or any number of others, and changing the value to a larger one could cause any number of issues.

I'd order the right parts.
 
Many circuits rely on specific capacitance values..
Click to expand...
Electrolytics give you a lot of capacitance cheaply but they have horriblly wide tolerances and horriblly non-ideal behavior. If you were building a RC oscilator or other sensitive circuit you would NOT use an electrolytic capacitor.

When you see big electrolytics it's almost certain they are being used for power supply smoothing.
 
I've done board fabrication in the past. Going to a higher voltage part is not an issue. Going with a higher rated capacitor does not always work. Its just like Arcygenical said, it depends on the circuit. Madhatter340 has got the right idea.
 
You must log in or register to reply here.
Back
Top