[Milkymist-devel] [MM1] placed littlefuse V9MLA0402LN [was Re: Damaged video in & audio noise]

[Adam Wang]

Hi,


>
>> VIDEO INPUT
>> Replacement of the ADV7181 chip on my board restored the video input
>> functionality. This supports the theory that the chip was damaged
>> because of a voltage surge coming from my camera when it died.
>> Let's just add the Littelfuse transient voltage suppression devices on
>> the video input connectors of the RC3.
>>
>
> will add  Littlefuse V9MLA0402 placed in the rear of each video input
> connector.
>
> http://www.littelfuse.com/products/Varistors/Multilater+Varistors+%28MLV%29/ML/V9MLA0402.html
>

After placed V9MLA0402LN in front of C204 (green RCA connector),  the video
captured same as
http://downloads.qi-hardware.com/people/adam/m1/pic/M1_Screenshot_fullscreen_V9MLA0402LNH_casio_ex-z200.png

I didn't inject a real 9V or 12V to test. The part is designed to suppress a
variety of transient events, including those specified in IEC 61000-4-2 or
other standards used for EMC, so its goal is typically applied to protect
decoder.*
*
-adam
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