[TechAssist] Re: samsung TXK2754, No video
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 25 Mar 2002 08:05:08 -0500
just had a samsung txb1920 cka50zh chassis no video. it turned out to be
Q911 video blanking transistor was leaky.
al marquardt
ampm@xxxxxxx
----- Original Message -----
From: <Wallyusmc1@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, March 25, 2002 1:14 AM
Subject: [TechAssist] samsung TXK2754, No video
>
>
>
> Hi gang,
> This set came in with no raster. High voltage and G2 voltages were
correct.
> Missing two voltages on video CRT IC's. Replaced blown LA7845, Vert IC,
and
> two .45 ohm supply resistors. This restored video, but only momentarily.
> After 20-30 seconds the raster blanks out and Cathode voltages go to
source
> voltage. Turn set off and back on and perfect picture returns again for
> another 20-30 seconds. I know It's losing video drive but can;t figure
out
> why. Any help would be appreciated.
> Walt
>
>
> Walt Chambers, LtCol, USMC (Ret)
> Walt's TV/VCR Service
> 3753 Mission Avenue, STE 117
> Oceanside, CA 92054
> Ph 760-966-1213
> Fax 760-966-0891
> Mailto:wallyusmc1@xxxxxxx
>
>
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