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Passive Components
Forum Capacitor replacement
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Related

Capacitor replacement

Former Member
Former Member over 10 years ago

Hello everyone!

I would need your help solving a little problem where I am not sure of the value of a capacitor that I need to replace.

I have never seen a capacitor like this one (yep, I'm a noob) so I searched online for some info and I though I could read it's value...the problem is that when I desoldered it from the board I noticed that on the other side it had other things written that, to my little knowledge, suggest a different value. Here are the pictures:

 

image

From this one I read that the precision is B, and the value is 4.1 uF with max 400v. The rest of the letters I have no idea what they mean.

image

From this one I read that it is a 4,7 pF capacitor and the precision is M. The rest I do not understand.

 

What I would really like to know is what the actual value of the capacitor is and if possible, what the various things on both sides mean so that in the future I will be able to read them.

Thank you very much in advance

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Top Replies

  • mcb1
    mcb1 over 10 years ago +1
    Typing 472M into google gives you 26,700 replies or thereabouts. http://www.csgnetwork.com/capcodeinfo.html Your out by a long way ... Why are you thinking that is the problem.? I'd be looking more at…
  • mcb1
    mcb1 over 10 years ago in reply to Former Member +1
    Do you suggest replacing both the resistor and the capacitor at this point? Why? If the value of the capacitor (now you have it out) and the resistor are what they should be, then there is really no…
  • Former Member
    Former Member over 10 years ago in reply to mcb1 +1
    This is the main board from a 1970's/1980's tv...the power supply should be ok as it is a separate unit and I got it fixed a few months ago. The problem is that a few days ago the tv made a noise (like…
Parents
  • jw0752
    0 jw0752 over 10 years ago

    Hi Francesco,

    Just out of curiosity, How does the resistance of the resistor compare to the value printed on it? I have seen these resistors fail and have a small arc form at the failure point. This arc can leave a dark metal deposit on a nearby part. I would begin by testing the resistor. If it has failed you will find that it is open circuited and will give no reading on an ohm meter. If you don't have a meter you can pick a cheap one up usually for less than $10. US.

    John

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  • Former Member
    0 Former Member over 10 years ago in reply to jw0752

    Well the resistor should have a value of 8.2k and the meter shows 8.1k but I do feel a tiny bump on it with my finger. Could the resistor produce much more heat than usual while maintaining the correct value of resistance?

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  • jw0752
    0 jw0752 over 10 years ago in reply to Former Member

    Hi Francesco,

    The 8.1K is close enough and indicates that the resistor is not the problem. The bump is probably just a little extra ceramic. The mark on the capacitor may be left over from a previous problem. The circuit may have to be checked out under power and since this is a high voltage area it will probably be best to bite the $bullet$ and take it to the TV service guy.

    John

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  • jw0752
    0 jw0752 over 10 years ago in reply to Former Member

    Hi Francesco,

    The 8.1K is close enough and indicates that the resistor is not the problem. The bump is probably just a little extra ceramic. The mark on the capacitor may be left over from a previous problem. The circuit may have to be checked out under power and since this is a high voltage area it will probably be best to bite the $bullet$ and take it to the TV service guy.

    John

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  • Former Member
    0 Former Member over 10 years ago in reply to jw0752

    Thank you very much for your suggestions. I will try my best to figure out what is wrong with the board on my own but if I cannot solve the problem I'm gonna eventually have to bring it to the shop

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