[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
- From: "John Conti" <contitv@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 14 Oct 2005 20:04:19 -0500
David, I remember that C109 (1.5uf @200v) would either get leaky or shorted
and could cause that problem. There should be 127v B+ on the +side of it.
Also have you checked SCR 101 its on the heat sink for leakage, Its the
regulator. It gets its drive from pin & of ic (u401). I don,t know if I
mentions this but check starup resistor R115 (36k 2Watt) . The X-ray over
voltage on this shows to be scr401 going to cr406 (20v) zener. I don't
remember how to bypass the protect maybe lifting one leg of cr406 and using
a variac starting at 85 to 90v ac.
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 17:38:03 -0400
>
>I read somewhere a leaky 20v zener (CR406) in the xray protection circuit
>could cause a cycling ON/OFF problem. I don't have another 20v zener to
>try.
>My question is how do I disable or bypass xray for test purposes. I need to
>start eliminating the possible causes of this problem. Xray shutdown, high
>+B, low secondary FBT voltage, bad flyback, etc. Thanks in advance, 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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