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From: Franc Zabkar on 6 Nov 2008 15:55
On Mon, 3 Nov 2008 22:45:55 -0800 (PST), jango2
<crow_slapper(a)yahoo.co.uk> put finger to keyboard and composed:

>i'm stuck
>with the same symptom on 2 monitors, one's a Samsung plasma, the other
>a sony LCD. Hard to explain the problem in words but i'll try. The
>picture is pretty normal except when i'm looking at a face, i get
>contours inset with a colour shade thats slightly off normal. I will
>upload pics by this eve. Would be great if you could help me.
>Thanks again,
>Jango
>:)

I have posted your photos on my web site. Perhaps someone else can
help you.

http://www.users.on.net/~fzabkar/temp/DSC05262.JPG
http://www.users.on.net/~fzabkar/temp/DSC05267.JPG
http://www.users.on.net/~fzabkar/temp/DSC05269.JPG

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
From: kvm on 7 Nov 2008 00:33
jango2 wrote:
> On Nov 3, 2:10 pm, Franc Zabkar <fzab...(a)iinternode.on.net> wrote:
>> On Sun, 2 Nov 2008 20:03:38 -0800 (PST), jango2
>> <crow_slap...(a)yahoo.co.uk> put finger to keyboard and composed:
>>
>>> Need these 2 datsheets (SN755870 and RJH3077) . I'm trying to fix a
>>> busted Samsung 42" plasma with defective Y drive and Y buffer pcbs.
>>> While the SN755870 is made by TI , their website wont acknowledge it's
>>> existence (OEM).
>> See page 14 of this document:http://documentation.renesas.com/eng/products/transistor/rej16g0001_t...
>>
>> ... and maybe this one:http://documentation.renesas.com/eng/products/others/rej02a0003_guide...
>>
>> - Franc Zabkar
>> --
>> Please remove one 'i' from my address when replying by email.
> Hey thanks Franc,
> I suspected it might be an IGBT. This helps a lot. Hey franc i'm stuck
> with the same symptom on 2 monitors, one's a Samsung plasma, the other
> a sony LCD. Hard to explain the problem in words but i'll try. The
> picture is pretty normal except when i'm looking at a face, i get
> contours inset with a colour shade thats slightly off normal. I will
> upload pics by this eve. Would be great if you could help me.
> Thanks again,
> Jango
> :)
>
>
Jango..
I have worked on some older video processors used in multimonitor video
walls and I have seen what looks like the problem you are seeing in the
faces..
What was causing my problem was the data on one of the higher number
data lines D6 or D7 line was completely missing (8bit A/D processor).
You might want to scope your data buses. Mine turned out to be a bad
plated through hole. Just a thought. Hope it helps
Dave Mc
From: jango2 on 7 Nov 2008 10:39
Wow, thanks kvm, that lead is very encouraging . Gonna scope them
busses first thing in the morn. Wondering if that means i should be
hunting for breaks in the Y drive, or logic board or LVDS or input
module......Whatever the case , i see faint glimmer of hope.
And thanks Franc for the webspace.
:)
cheers !
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