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#1
10-18-2020, 02:16 AM
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Sony KV-2643R composite injection
Hey all so I have this Trinitron KV-2643R that I just brought back from the bowels of the deep and installed a A67JHG01X from a roach infested tabletop. Dialed in and looks good but I'm interested in injecting composite or even better svideo into the chroma/luma pins at the jungle. It's a Sony CX-556 IC. Have no specs on it. Or a sams on the set. I've done many RGB mods on trinnys and others of the such, but usually have a schematic to help me out. Any ideas?
Thanks!
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Honey, turn on the tv.. I'm cold! 
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#3
10-18-2020, 09:31 PM
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Your awesome thanx! Gotta run to Seattle for a job so its going to be a few weeks on the backburner but I'll let you know know it goes.
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Honey, turn on the tv.. I'm cold!
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#4
10-19-2020, 10:59 AM
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Looking at that schematic I could inject my video at the base of the video amp and remove the incoming out of circuit, to eliminate interference from the tuner, I could inject the Chroma at pin 13, but may need a .01 cap to drive down the signal as it will probably be to amplified, and maybe 75 ohm to ground, not sure yet, but based on this, I dont want video to go direct to pins 5 and 6, since I will be bypassing sharpness and sync, that's still needed in the circuit, but I may have to come up with a voltage circuit to amplify the composite to the jungle or there will be nothing there to boost the composite signal and it will be dull since i will essentially be cutting out the tuner on board . Does that sound about right?
On the other hand, simple composite input would be easy, I would just dump the composite at the detector off video amp but may still need to amplify voltage there with something like a 2N2222
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Honey, turn on the tv.. I'm cold! Last edited by freakaftr8; 10-19-2020 at 11:04 AM.
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#5
10-22-2020, 10:48 PM
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Quote:
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Honey, turn on the tv.. I'm cold!
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#6
10-23-2020, 08:52 PM
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I'm confused. There is no IC302 in this set, and IC202 is in the audio circuit. Also, I can't find test point 22. Tell me what part of the diagram you need a better picture of and I'll try to do my best.
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#7
10-23-2020, 09:23 PM
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Ahh sorry, i meant q202 or q302. Tp22 is at the base of the video amp transistor.
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Honey, turn on the tv.. I'm cold!
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#8
10-23-2020, 09:24 PM
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Yep thats it! Thanks again ill inject composite at TP12 and ground at the IC302 ground. This will give me composite.
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Honey, turn on the tv.. I'm cold!
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