[TechAssist] Re: Proscan PS31150 CTC169GL in shutdown/dead
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 9 May 2004 11:14:06 -0400
Peter,
Check this:
RCA\P46770CK PTK169PAAS\Shut down or no start problems\\\\Cap leaked onto blue
resonator near horizontal
section.\Replaced cap and resonator #200210\\\\\\\
Also, a shorted audio out IC will cause this set to shutdown.
Bad regulator chip I believe would cause no start.
Do you have a schematic?
Jeff
--
Intrepid Video TV/VCR Repair
263 S Front St, Steelton PA 17113
717-939-7708; (F) 717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, May 08, 2004 5:46 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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