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Old 23rd March 2009, 12:42 AM   #1
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Join Date: Apr 2005
Location: Simcoe Ont
Default Capacitors

I am very inexperience but really enjoy electronics work. I am learning very slowly. I recently encountered a television that won't stat up. When plugged in on Capacitor 100uF 250 volt is squealing continually. Is it fair to assume that capacitor is defective?
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Old 23rd March 2009, 01:56 AM   #2
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
Capacitors shouldn"t make any noise at all so I don"t think that is the problem .....

I recently had a 36in RCA CRT TV set start squeeling really badly and it had no picture and it ended up that the Flyback transformer shorted out which caused the Picture to not work which also blew out a Power Mosfet in the switching PSU ...It cost me about $150 to fix and is still working fine......

TV sets are pretty complicated devises , much more complex than yer typical amp and a TV set has Voltages in it that can kill you pretty quickly , possibly even when not plugged in .... I would take it in to get fixed....


Cheers
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Old 23rd March 2009, 02:05 AM   #3
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Default capacitor

Yeah I am a little shaky around flybacks but I insulated a stethoscope and the squealing is defintely the capacitor!
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Old 23rd March 2009, 02:30 AM   #4
Minion is offline Minion  Canada
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Well If you are sure it is the capacitor then try changeing it , make sure you discharge it first though....

Cheers
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Old 23rd March 2009, 04:48 AM   #5
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Default Capacitor

I am far from sure the problem is the Cap but I am sure the squealing is coming from it.
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Old 23rd March 2009, 10:58 PM   #6
Minion is offline Minion  Canada
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After doing a bit of research for you it turns out Power supply caps in switching power supplkies can make this noise when they get leaky.... Try replaceing it... I know in my TV the Big power supply cap in the SMPS was a Bi-Polar cap so if your is the same make sure you replace it with a Bipolar cap...


Cheers
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Old 24th March 2009, 12:40 AM   #7
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Default Capacitors

Thank you so very very much
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