[TechAssist] Re: RCA Model# P52960(YX1), chassis# PTK195Y06B, intermittent horizontal pincushion
- From: "tvservice" <tvservice@xxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 13 Dec 2002 12:31:19 -0600
Try subbing the convergence power supply board
it's the one just above the convergence amplifier board
252474 New part #250686 $32.70 dealer
I have seen several intermittent STK730-130 reg IC on these
the new board uses FET reg similar to the TV power supply
also the secondary diodes are bad about opening under load or shorting
Robert
tvservice@xxxxxxxxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 13, 2002 7:22 AM
Subject: [TechAssist] RCA Model# P52960(YX1), chassis# PTK195Y06B,
intermittent horizontal pincushion
> Folks,
>
> I currently have an RCA Model# P52960(YX1), chassis# PTK195Y06B, with very
intermittent horizontal pincushion. I have gone to the customer's home twice
and never saw the problem so I ended up bringing it in to the shop. It ran
around the clock for almost 24 hours before exhibiting this symptom. I have
resoldered a multitude of connections on various boards. The symptom does
not appear to be vibration or tapping sensitive as it is now displaying the
pincushion problem and I cannot get it to go back to normal (bear in mind I
have not turned the TV off, hoping to keep the symptom present in order to
troubleshoot. I am getting ready to leave for road calls so I have not yet
broken out a scope nor do I cuurently have the time to sit with it. Also
remember this chassis may be difficult to access locations on the board with
it fully assembled. I am almost afraid to turn it off for fear of the
picture returning to normal. I was hoping someone out there had already had
this problem so
> I welcome your input.
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
>
>
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