[TechAssist] Re: Proscan PS31150 CTC169GL in shutdown/dead
- From: "Jeff Farnsworth" <jlfonz@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 9 May 2004 01:41:30 -0500
Just traced one down to a bad flyback. No 26Vdc going to vert circuit so
shutting it down before it can get started. The set I had/have has a 200418
fly in it. Not sure how this compares to the one you're looking at it.
TV Doctor
Avalon, Wi
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, May 08, 2004 4:46 PM
Subject: [TechAssist] Proscan PS31150 CTC169GL in shutdown/dead
> Proscan
> PS31150
> CTC169GL
>
> Set when plugged in will give a faint chip with a cycle
> of 8 or 9 smaller and dimishishing power supply start attempts (no attempt
> to start the rest of the set) B+ on C4141 peaks at about 189v for the
> instant it is there. The Cycling in the power supply sounds some what like
a
> resonate decay ringing. Set before I got to it appears to have been
> extensivly reworked (time frame ?) ie eniter Micro circuit reworked (new
> shiny solder...) the power supply caps in the sw mode appear to have been
> replaced (they test ok out of circuit 2.2uf, 15uf, 47uf, 470uf) Tried
> subbing out diodes usch as CR4118, 4117, 4116. Did find a cap C4143 1000uf
> 35v leaking electrolite but replacing had no effect (traces on underside
of
> board show discoloration but still have continuity). C4401 tests ok (it is
> an orange drop in this set). I was thinking that the feedback might be
> sending incorect bias information to the regulator chip. (I have a spare
> chip but havent put in yet as supply appeared to be at least attempting to
> work, will be next step on monday. Ideas?
>
> Peter Oliver
> Tucson Radio TV
>
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