[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 17 Oct 2005 22:34:18 -0400
Gentlemen, I am truly confused! I've checked all tips mentioned by you
wonderful guys, tips that have obviously been around for awhile as this
chassis is 25 years old. I still can not find the problem. This TV cycles
ON/OFF about every 3-5 seconds once the "PWR" on button is pressed. I'm
missing some of the schematic Max sent over, the part that contains
information about Q601. I need to study this part of the circuit a bit more
to confirm what may be going on here. When I press the "PWR" on button I see
minimal activity at the base of Q601. Where does the signal come from that
drives this transistor, perhaps the mystery lies here. Thanks for all the
tips and advice, if anyone has information about Q601 please send it along.
Of course any other tips would be greatly appreciated. BTW I don't normally
spend this much time of a TV, its become a learning thing at this point.
David Lessard. Alexandria, Ontario, mr_fixit@xxxxxxxxxxxx
----- Original Message -----
From: "John Conti" <contitv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, October 14, 2005 5:14 PM
Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
Dead - Shorted HOT
> David, just a few things to check,c115 (68uf) check r 115(36k)
> cr105,cr408....also check r16 (1.5 ohm)p/n 175331 in the drain terminal of
> Q1 VIR out for increase in value. This is a critical resistor. also c7
> (68uf) c11 (150uf) can cause this problem. And c 108 (.22uf) Hope this
> might help.
> Also if that does't help check all solder connections on the mtt001 or 002
> module.
>
> John
> Conti,sTV
> Texas
>
> >From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> >Reply-To: techassist@xxxxxxxxxxxxx
> >To: <techassist@xxxxxxxxxxxxx>
> >Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
> >Dead - Shorted HOT
> >Date: Fri, 14 Oct 2005 15:24:09 -0400
> >
> >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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