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

  • From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 22 Apr 2005 12:30:23 -0400

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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