Re: RCA (Thomson) F20TF10 in a coma
Transformer failure probability is very small, 1% of the 100
Transformer failure probability is very small, 1% of the 100
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Re: RCA (Thomson) F20TF10 in a coma
Yeah, it's more like some failure elsewhere causing the transformer to operate in a more audible mode. Assuming the noise is abnormal from the usual operating noise."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: RCA (Thomson) F20TF10 in a coma
That's good to know. There may be hope for this thing
I am in the process of checking the eletrolytics.
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Re: RCA (Thomson) F20TF10 in a coma
I wonder if something connected to that transformer is shorted?"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: RCA (Thomson) F20TF10 in a coma
I don't know, I couldn't find any pinout or other info on the transformer.
However, I already found a bad 10uF 250v cap in the horizontal output circuit on the HOT emitter. It was only the 5th cap I pulled to test too. Measures 1uF 250 ohms ESR. I've got an 8uF 450v axial I'm going to substiture there that actually measures 9.5uF. It's much larger but there is room for it if I can wire it in. I also have a couple of 10uF 200v caps but I don't know what the peak voltage is there so don't want to chance it.
Edit: replacing that cap didn't fix the TV, it's acting exactly the same so back to checking more caps
The DC voltage across the cap is 134v, do you guys think it'd be ok to use a 200v cap there?
Edit2: Found another bad cap, I expect to find more.
Last edited by SteveNielsen; 11-11-2014, 10:02 PM.Comment
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Re: RCA (Thomson) F20TF10 in a coma
8uF 450v it is normal for the replacement a bad 10uF 250vComment
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Re: RCA (Thomson) F20TF10 in a coma
I have checked everything I am capable of and willing to do on this one. I've checked every electroyltic cap, every discrete non-SMD transistor and diode, many both in and out of circuit, and all the fuses and resistors in the power supply sections, and a lot more other things.
So I'm giving up, it's no longer worth my effort and I'll move on. I'll salvage some possibly useful parts but it is going to be recycled. It was fun trying, and thanks for the help you guys, especially Kasfamily.Comment
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Re: RCA (Thomson) F20TF10 in a coma
Hi Steve! I also was interested to solve this problem and try to help you. Sometimes even have to repair these old TV. I just wanted to say that for some time I could not participate in the thread. I go on holiday to Egypt in Sharm El Sheikh.
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Re: RCA (Thomson) F20TF10 in a coma
You've been great Kas. I really appreciate the interest and attention and help you've given to me. I have no complaints
Have a great holiday in Egypt. Have a great time there!Comment
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