[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 14 Oct 2005 20:29:31 -0400
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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