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Date Posted: 23:11:23 01/10/02 Thu
Author: lcs
Subject: Re: Bluescreen control into LN7530?
In reply to: Joe 's message, "Bluescreen control into LN7530?" on 23:14:17 01/09/02 Wed

First get the datasheet of the LA7530 at
http://www.semic.sanyo.co.jp/index_e.htm.

The blue screen will not appear if the
video signal is descrambled, so put the
3chip board after the video out, coming
from the 7530 (pin 16 passing through a
ceramic filter). In my case, the signal
was too low, so I added a transistor
and a 470R resistor (see the datasheet)
and took the video from the emiter to
the 3chip board, using a 47uF capacitor.
If necessary, replace the 75R at the
3chip for 470R or higher.

The signal at the output of the 3chip
goes to the next IC in the VCR, but
you can also connect the 3chip output
directly to your TV monitor, to set
the board up. This way you don't have
the blue screen anymore.


lcs





>Hi guys,
>
>(sorry 4 bad english, french....)
>
>I am starting a 3Chip board but first I want to clear
>something. (Piu's)
>
>I have a VCR with bluescreen problem. To BYPASS it
>where I must connect the 3Chip board? At the video
>output pin of the LN7530 chip (IF chip?), at VIF pins
>(2) of the same chip, ... ???
>
>Where is the bluescreen control. Is it really on the
>LN7530? Then must I place the 3Chip at the input of
>LN7530... So some help?
>
>I readed in the forum to add a transistor
>(emiter-follower) somewhere in the vcr circuit to
>solve it.
>
>My last chance, a old VCR without blue screen but less
>than 36 channels!!! ;-(
>
>Thx

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