[TechAssist] Re: update2: RCA P60752EB, PTK169PEC intermittant video:goes black, has sound

  • From: "Larry E" <videotech@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 22 Apr 2005 11:25:11 -0400

Phil, does OSD/Menu work? TV video & Switched video both go through the
comb filter & spip module, check  C6445 in comb filter, it may be cracked or
have poor solder, value is 2700pf, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, April 22, 2005 9:51 AM
Subject: [TechAssist] update2: RCA P60752EB, PTK169PEC intermittant
video:goes black, has sound


> I went back and saw the cracked corner of main board and traces  around
> location A-26. I repaired two traces but I still have this
> vertical-video flashing.
> Note: I hooked up my VP301 pattern gen to  the set's composite "video
> in-1" and my pattern shows the disturbance. S-video input shows it as
> well but not quite as bad. Funny, but this set has a video output jack
> "video select out". I attached an RCA cable from that to my composite
> monitor. Picture is unaffected and good at all times from this output!
> So, wherever this jack pulls the video from the TV must be before the
> trouble. I am concentrating on vertical at this point. (help!)
> Phil Bader
>
> Phil Bader wrote:
>
> >I pulled the chunk and benched it.Slid the main board out and
> >over,studied the bottom under high magnification. I found no cracks
> >mentioned or bad traces so far. What I did find was at the junction
> >where the yellow yoke wire solders to the board,( location terminal ID
> >"E502" ) and R523, a distinct ring crack all around both wire and
> >resistor . Had to use good light and my nerdy magnifier hood with both
> >lenses down! Tho I never actually saw a vertical collapse during the
> >effect, I bet  what I saw with the video flashing was the TV
> >safety-blanking the video as this connection arced.  Make sense? Will
> >let you know.
> >Phil Bader
> >
> >Phil Bader wrote:
> >
> >
> >
> >>Customer said this intermittant problem happens more now:
> >>Sound stays OK.
> >>I've seen it: Video intermittantly sort of streaks, then goes, leaving a
> >>black screen. Not the HV,it stays... this is definately just the
> >>composite video picture. I'm testing this on the cable tuner input now,
> >>not sure if it happens on any other inputs (just got here).
> >>I'm a tech from the 1970's and this looks like the symptom where a
> >>breakdown switch is dirty and you moved it causing the video to jump
> >>out, or a video peaking coil is opening. Kind of a static lines to the
> >>right across the screen then black.Any histories on video loss like this
> >>on these? (intermittants like these are difficult to nail down)
> >>Phil Bader
> >>
> >>
> >>
> >>
> >>
>
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