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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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TV RF connector capacitor function?
My RF connector was ripped out of the back of the TV and the Capacitor
connected to the center lead inside a small metal box was destroyed. I reconnected the connector without the cap and it works. What is the function of this cap? It is a BROWN/ORANGE DISK shape approx 1/2 the size of a penny. Ceramic? |
#2
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TV RF connector capacitor function?
"martin king" wrote in message news:S1pab.2417$Ph5.630@edtnps84... My RF connector was ripped out of the back of the TV and the Capacitor connected to the center lead inside a small metal box was destroyed. I reconnected the connector without the cap and it works. What is the function of this cap? It is a BROWN/ORANGE DISK shape approx 1/2 the size of a penny. Ceramic? Probably a DC blocking capacitor. If so, it's there to prevent DC from damaging the tuner. I once had a very expensive and bad experience when a DC blocking capacitor was absent; they can be very important. |
#3
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TV RF connector capacitor function?
You should mention the make and model number of the set, in order that someone may have information about the exact part specification. What will work if you do not know the exact cap specifications, you can use a 420 pF / 1KV type. This cap is necessary for antenna isolation. Any cap from about 330 pF to about 470 pF. Make sure that the voltage rating is at least 1KV. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ========================================= "martin king" wrote in message news:S1pab.2417$Ph5.630@edtnps84... My RF connector was ripped out of the back of the TV and the Capacitor connected to the center lead inside a small metal box was destroyed. I reconnected the connector without the cap and it works. What is the function of this cap? It is a BROWN/ORANGE DISK shape approx 1/2 the size of a penny. Ceramic? |
#4
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TV RF connector capacitor function?
Why size cap should I replace it with?
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#5
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TV RF connector capacitor function?
Subject: TV RF connector capacitor function?
From: "martin king" Date: 9/18/03 5:00 PM Eastern Daylight Time Message-id: S1pab.2417$Ph5.630@edtnps84 My RF connector was ripped out of the back of the TV and the Capacitor connected to the center lead inside a small metal box was destroyed. I reconnected the connector without the cap and it works. What is the function of this cap? It is a BROWN/ORANGE DISK shape approx 1/2 the size of a penny. Ceramic? Well, since you posted this it means you're still alive. That's part of the isolation system of that TV which likely has a "hot" chassis design. It prevents serious electric shock to someone who comes in contact with the center lead and some sort of ground. Locate a new assy and replace it before someone gets hurt. John Del Wolcott, CT "Nothing is so opportune for tyrants as a people tired of its liberty." Alan Keyes (remove S for email reply) |
#6
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TV RF connector capacitor function?
"Charles Schuler" wrote in message "martin king" wrote in message Probably a DC blocking capacitor. If so, it's there to prevent DC from damaging the tuner. I once had a very expensive and bad experience when a DC blocking capacitor was absent; they can be very important. .......NO, not a DC blocking capacitor, although that is what a capacitor can do, BUT it is rather a SAFETY component that isolates the television's "hot chassis" circuitry from external metal parts and external connections such as the antenna connector. FIRST.... UNPLUG the television IMMEDIATELY and either replace the entire "isolation block" (the small metal box that you described) that would include a new antenna connector and a plug at the other end that plugs into the tuner.... or replace the capacitor with the exact original equipment value and rating. Again, this is a electrical shock hazard SAFETY item, not just a tuner protection component. An omitted or wrong type of capacitor can present a lethal and dangerous electrical shock hazard and a fire hazard..... repair this correctly with the proper replacement isolation block.. -- Best Regards, Daniel Sofie Electronics Supply & Repair |
#7
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TV RF connector capacitor function?
"Sofie" bravely wrote to "All" (18 Sep 03 17:15:48)
--- on the heady topic of " TV RF connector capacitor function?" I think this part combines a small value capacitor in parallel with a large value resistance inside the same package. The capacitive part is to create the RF path and the resistive part is to safely discharge the antenna static. Some circuits vary in how complex the part is but the voltage rating seems to be very important. So From: "Sofie" So "Charles Schuler" wrote in message "martin king" wrote in message Probably a DC blocking capacitor. If so, it's there to prevent DC from damaging the tuner. I once had a very expensive and bad experience when a DC blocking capacitor was absent; they can be very important. So ......NO, not a DC blocking capacitor, although that is what a So capacitor can do, BUT it is rather a SAFETY component that isolates the So television's "hot chassis" circuitry from external metal parts and So external connections such as the antenna connector. So FIRST.... UNPLUG the television IMMEDIATELY and either replace the So entire "isolation block" (the small metal box that you described) that So would include a new antenna connector and a plug at the other end that So plugs into the tuner.... or replace the capacitor with the exact So original equipment value and rating. Again, this is a electrical So shock hazard SAFETY item, not just a tuner protection component. An So omitted or wrong type of capacitor can present a lethal and dangerous So electrical shock hazard and a fire hazard..... repair this correctly So with the proper replacement isolation block.. So -- So Best Regards, So Daniel Sofie So Electronics Supply & Repair .... Letterman of Borg - "Ok, Top 10 reasons why resistance is futile:" |
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