AGC hack ? -- New 3C

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Date Posted: 02:08:01 01/28/02 Mon
Author: tequ
Subject: AGC hack ?

Hi,

Can someone tell me how to make AGC fix when IF chip is LA7575, should video signal to get out from pin 17 or 21.
Where should capacitor put and what are recomended values for that.

I have now taken the signal from pin 21. Tryed capacitor to pin 10 with value of 47uF. The picture is better but not good enough. I also have problem with video muting (blue screen). I disabled on-screen unit from video and the blue screen was gone, but screen goes black quite easy. It could go black because of AGC or there is still some muting function left, I also cut video mute signal from IF card.

here is link for datasheet
http://service.semic.sanyo.co.jp/semi/ds_pdf_e/LA7575.pdf

Video is JVC, model I don't remember...

-tequ

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Replies:

Re: AGC hack ? -- Jain, 05:23:20 01/28/02 Mon
- Re: AGC hack ? -- tequ, 09:20:14 01/28/02 Mon
- Re: AGC hack ? -- tequ, 03:54:14 01/29/02 Tue
  - Re: AGC hack ? -- Jain, 05:05:09 01/29/02 Tue
    - Re: AGC hack ? -- tequ, 22:47:42 01/29/02 Tue
      - Re: AGC hack ? -- Jain, 05:14:36 01/30/02 Wed
By the way... AGC hack! Read this! -- Jain, 11:39:50 01/28/02 Mon
- Re: code for AGC -- Phil Q., 14:02:56 01/28/02 Mon
  - Re: code for AGC -- Jain, 14:43:09 01/28/02 Mon
    - Re: code for AGC -- Phil Q., 18:27:57 01/29/02 Tue
      - Re: code for AGC -- Jain, 05:17:32 01/30/02 Wed

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