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

  • From: "tvservice" <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 22 Apr 2005 17:44:43 -0500

I'd say it's probably a cap or leaky semiconductor on the PIP board.
You may need the schematic to troubleshoot this.
I remember having a zener diode give some problems once but don't find a
note on it.
good luck
I'm gone for the weekend
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc

----- Original Message ----- 
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, April 22, 2005 5:01 PM
Subject: [TechAssist] Re: update2: RCA P60752EB, PTK169PEC intermittant
video:goes black, has sound


> This PIP board looks perfectly clean. I wonder if one of the ICs are
> noisey. Caps look clean and ESR good. No ring cracks, tho I resoldered
> the cable pins before reassembly. Well it's bad I guess anyway.
> Tritronics shows two PIP modules in this set:
> "S-PIP PCB"  207824 inactive part, and
> "S-PIP MICRO PCB" 207818 not  available, can be ordered.
> Which one is this one of mine? On the TV's insert paper, it calls it the
> "3XXX SPIP".
> Phil
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
> tvservice wrote:
>
> >If you and the customer are satisfied with picture quality it is OK to
leave
> >bypassed.
> >I have found bypassing this PIP circuit usually gives a poorer picture
but
> >most people may not see it.
> >
> >
> >----- Original Message ----- 
> >From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Friday, April 22, 2005 4:33 PM
> >Subject: [TechAssist] Re: update2: RCA P60752EB, PTK169PEC intermittant
> >video:goes black, has sound
> >
> >
> >
> >
> >>I just don't believe it. I did your bypass. The picture is stable as a
> >>
> >>
> >rock.
> >
> >
> >>I opened that PIP, removed the smaller board inside, looked all over,
> >>ESRd the lytics,etc. Found nothing. But I have to agree this seems to
> >>have done it. I wish I could just leave this bypass in place. Is it
safe?
> >>I could give the customer a choice, with/without (if even available)
> >>I'll watch this awhile and see.
> >>Thanks, all for the help. Will advise.
> >>Phil Bader
> >>
> >>Philip Bader
> >>Jan Phyl TV Inc. (estab. 1976)
> >>3420 Recker Hwy. Winter Haven, Fl. 33880
> >>Fax (863) 299-8821
> >>email: tjanphyl@xxxxxxxxxxxxxxx
> >>
> >>
> >>
> >>tvservice wrote:
> >>
> >>
> >>
> >>>you can bypass PIP module for a test, at p8003 connector cut wire #1
and
> >>>
> >>>
> >#8
> >
> >
> >>>(chroma in and out) joint them. Do the same thing wire #3 and#6 (luma
in
> >>>
> >>>
> >and
> >
> >
> >>>out).
> >>>Robert
> >>>tvservice@xxxxxxxxxxxxx
> >>>H & H Electronics Inc
> >>>
> >>>
> >>>----- Original Message ----- 
> >>>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >>>To: <techassist@xxxxxxxxxxxxx>
> >>>Sent: Friday, April 22, 2005 11:30 AM
> >>>Subject: [TechAssist] Re: update2: RCA P60752EB, PTK169PEC intermittant
> >>>video:goes black, has sound
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>Yes, even while video is black(with a bit of distorted parts), I can
> >>>>still hit menu and see the OSD, as well as that video output jack I
> >>>>mentioned is good. I noticed a lot of PIP mentions, but this is a very
> >>>>large PIP module, called "Spip-511". I don't think this is the one
with
> >>>>the rubber feet that goo up.I opened it and theres a smaller PCB
inside
> >>>>but no rubber.
> >>>>Phil
> >>>>
> >>>>Philip Bader
> >>>>Jan Phyl TV Inc. (estab. 1976)
> >>>>3420 Recker Hwy. Winter Haven, Fl. 33880
> >>>>Fax (863) 299-8821
> >>>>email: tjanphyl@xxxxxxxxxxxxxxx
> >>>>
> >>>>
> >>>>
> >>>>Larry E wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>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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>>>>------------------------------------------------------------------------
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> >>>>
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>>>-------------------------------------------------------------------------
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