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altezza tv


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Hi everybody, I'm triyng to replicate altezza tv system on a lexus is200, I already get a wired tv tuner. I can measure correct voltage on tv tuner pins and some low voltage I suppose to be signal transmission, so I assume it's wired up correctly, but can't see anything on the screen. On the lexus remote controller the tv button is an off button and it turn effectively the screen to a black condition, but I'd say it's not truly turned off, infact it is clearly visible it's still on. So the question is, does the tv management lie in the monitor or in the nav unit? Has anyone of you ever tried to swap the jap nav unit with another country unit preserving the tv functions?

Any help is welcome


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