[TechAssist] Re: PTK195 - Black Bar in Picture??
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 01 Jul 2005 16:35:58 -0400
A single bar would tell me you have some source of 60 Hz there. The two
sources in the TV are either the 60 cycle power supple, or the vertical.
I'm thinking vertical. Maybe a vert output IC getting noisey as it
warms. Try freeze spray on the vert IC and some of the components. The
Vcc to it is scan derived so not coming from there. Diodes, transistors
and ICs are known to get noisey junctions in them. Will keep looking.
Phil
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
Danny Garris wrote:
>What: 52" Big Screen TV
>Make: RCA
>Model: P52820BL
>Chassis: PTK195DB
>
>Problem: After 25 min warm-up the picture will have (1) "Black bar" appear
>in the screen and slowing moves from bottom to center of picture. This
>vertical (going from left to right) "black bar" is about 2-3" tall and would
>appear at the bottom of screen and slowly move up to the center of the
>screen.
>
>Yesterday I looked up this type problem on my WINStips program and I found a
>tip that suggested replacing R14705 (1.0 ohm) (1/4 W) I replaced this
>resistor and now after warm up I have (2) "black-bars" appear in the picture
>after warm up.
>
>Anyone seen this problem?
>
>Danny Garris
>Garris Radio & TV
>New Bern, NC
>dgarris@xxxxxxxxxxx
>
>
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