[TechAssist] Re: Proscan PS31150 CTC169GL in shutdown/dead
- From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 9 May 2004 23:05:47 -0500
Been thinking about this, but I don't have a schematic in front of me. Does
this chassis have two leads going to the crt anode? If it does, pull out the
wire (from the anode cup) that goes to the focus/screen block. Isolate this
wire and then see if she will fire and stay up. Could be a shorted block.
Just a thought.
Jonas Miglinas
Miglinas TV
Chicago
----- 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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