Capacitors

argonrepublic · 22nd March 2009, 11:42 PM

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?

Minion · 23rd March 2009, 12:56 AM

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

argonrepublic · 23rd March 2009, 01:05 AM

Yeah I am a little shaky around flybacks but I insulated a stethoscope and the squealing is defintely the capacitor!

Minion · 23rd March 2009, 01:30 AM

Well If you are sure it is the capacitor then try changeing it , make sure you discharge it first though....

Cheers

argonrepublic · 23rd March 2009, 03:48 AM

I am far from sure the problem is the Cap but I am sure the squealing is coming from it.

Minion · 23rd March 2009, 09:58 PM

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

argonrepublic · 23rd March 2009, 11:40 PM

Thank you so very very much

22nd March 2009, 11:42 PM	#1
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	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?

23rd March 2009, 01:05 AM	#3
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	capacitor Yeah I am a little shaky around flybacks but I insulated a stethoscope and the squealing is defintely the capacitor!

23rd March 2009, 03:48 AM	#5
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	Capacitor I am far from sure the problem is the Cap but I am sure the squealing is coming from it.

23rd March 2009, 11:40 PM	#7
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	Capacitors Thank you so very very much

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23rd March 2009, 12:56 AM	#2
Minion diyAudio Member Join Date: May 2006	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

23rd March 2009, 01:30 AM	#4
Minion diyAudio Member Join Date: May 2006	Well If you are sure it is the capacitor then try changeing it , make sure you discharge it first though.... Cheers

23rd March 2009, 09:58 PM	#6
Minion diyAudio Member Join Date: May 2006	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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