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#1
09-27-2018, 12:25 AM
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I wonder if C404 or C405 is leaking and causing the DC bias current to shift.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 
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#2
09-27-2018, 01:46 AM
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Those lytics were changed along with 4 others in the video chain. I am wondering about that ABL transistor though. Sony does some strange engineering. I watched the set with the back off tonight about an hour and a half and intermittently the brightness/contrast would fluctuate. At least I know the video circuitry is functioning. Got to get a 51K resistor and go from there. Kind of odd. I'm trying to figure out the ABL part of the circuit. That battle continues (another day).
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Sony Trinitron is my favorite brand. My wish list: Sony KV-7010U Sony KV-1220U
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#3
11-04-2018, 11:51 PM
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More puzzled than before. See photo. Is this transistor a 2SC1363? I have an original Sony schematic (it is Canadian and not US schematic) that calls for an 2SC634A. I ordered a couple off of eBay and they aren’t the same size. I wouldn’t think the Canadian schematic would be any different from the US model as far as semiconductors go. The ABL transistor Q409 calls for an 2SC634A. But the photo is what I removed from circuit board. This is all original. Just curious what is going on.
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Sony Trinitron is my favorite brand. My wish list: Sony KV-7010U Sony KV-1220U Last edited by Popester; 11-04-2018 at 11:53 PM. Reason: Spelling
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