[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT

  • From: "J Silverman" <greentron@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 14 Oct 2005 21:08:14 -0400

Check the B+ filter cap.
Jerry Silverman Greentron Inc
Mail to: greentron@xxxxxxx
4 Newland Ave Greenville SC
29609                864 232 3889
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, October 14, 2005 8:29 PM
Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
Dead - Shorted HOT


> While digging a bit deeper I decided to monitor the raw 150V +B which is
> derived via bridge rectifier consisting of CR101-CR104, this bridge's AC
is
> supplied via 2.7ohm/15w resistor R102. Anyway while monitoring the 150VDC
I
> noticed that evertime the TV tried to fire-up the raw +B would drop
> dramatically, almost in half before it would "click" - "shutdown" and
start
> the cycle again. I suspected R102 breaking down under load and swapped it
> with a known-good resistor, same problem!! Question is what would cause +B
> to drop dramatically? What is causing such a load? Again, I'm stumped but
> still digging. David Lessard, Alexandria, Ontario, mr_fixit@xxxxxxxxxxxx
>
> ----- Original Message -----
> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, October 14, 2005 3:24 PM
> Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
> Dead - Shorted HOT
>
>
> > Follow-up:
> >
> > Replaced HOT, and R426 horizontal drive +B, resistor value was up by
> > 800ohms. TV pulses ON/OFF when ON" button is pressed, TV comes on for a
> > brief second as power cord is unplugged. I've replaced C672, C654 and
> C656.
> > When I disconnect RED wire on standup board next to VIPUR TV pulses
> ON/OFF.
> > What am I missing? What are the start conditions for this chassis to
> > fire-up? I know nothing about this 25 year old chassis. Thanks in
advance.
> > David Lessard, Alexandria, Ontario. mr_fixit@xxxxxxxxxxxx
> >
> > ----- Original Message -----
> > From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, October 03, 2005 9:57 PM
> > Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER -
CTC130A -
> > Dead - Shorted HOT
> >
> >
> > > Yes.
> > > Dead,5A fuse blown. Fix: Shorted cap C425 (043uf@200V) yoke return I
> > think.
> > >
> > > After you get it on, here's some issues you may face:
> > > Brightness a bit exessive,retrace: C122 (30uf@250V) front of flyback.
> > > Raster narrow at sides, slight bow: Q1 on pincushion upright board
near
> > > rear of chassis. RCA#146847/2N2222A,checks OK-replace it.
> > > Channels 2-6OK, no 7-13. Open and resolder all stakes inside the
MTT001
> > > module.
> > > Bands of interference (two) slowely moving up thru picture.: Inside
the
> > > MTT001A, change C654(100uf/16v),C672(220uf/25V),C656(330uf/10V).
> > > Immediate shut down at turn on:Flyback bad.
> > > Vert. retrace at top inch of screen.All assoc. caps seem to ESR OK.
> > > R506(6800ohm/2W) runs hot normally.Remove,scrape leads and resolder.
> > > Left side jailbars: Workaround: Add a 10uf/250V cap across CRT's PC
> > > board's stakes, pos. to "C6", neg to "Z1".(saves pulling chassis)
> > > Excess brightness: C122 (47uf@250)
> > > Unusual brightness issue: Increase brightness with control,all sudden
at
> > > max: R721 (680ohm) increased to 690ohm. Also: Q703 shorts
> > > (#143806/NTE159).HTH.
> > > Phil
> > >
> > > Philip Bader
> > > Jan Phyl TV Inc. (estab. 1976)
> > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > Fax (863) 299-8821
> > > email: tjanphyl@xxxxxxxxxxxxxxx
> > > personal/ alt. email: pbader@xxxxxxxxxxxxxxx
> > > see our ad at:
> > >
> >
>
http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.c
> > om/
> > >
> > >
> > >
> > > David Lessard wrote:
> > >
> > > >This TV has a shorted HOT (C1308K), main fuse is blown. Are there any
> > common problems besides a bad flyback which could cause this?
> > > >Thanks in advance,
> > > >David Lessard
> > > >Alexandria, Ontario, Canada
> > > >mr_fixit@xxxxxxxxxxxx
> > >
> >
>
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