[TechAssist] Re: RCA - 27"TV - PMR623ER - CTC130A - Ded - Shorted HOT
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 18 Oct 2005 22:01:27 -0400
Yes Max, I need information regarding the micro, Q601, etc. Thanks, David
Lessard, Alexandria, Ontario, mr_fixit@xxxxxxxxxxxx
----- Original Message -----
From: "Old TV Man" <mebonnell@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, October 17, 2005 11:50 PM
Subject: [TechAssist] Re: RCA - 27"TV - PMR623ER - CTC130A - Ded - Shorted
HOT
> David do you want some more of the schematic sent to you?
>
> Max Bonnell
> Bonnell TV
> Robinson, IL
>
> Sender: techassist-bounce@xxxxxxxxxxxxx From:
> mr_fixit@xxxxxxxxxxxx(David=A0Lessard) Date: Mon, Oct 17, 2005, 10:34pm
> (CDT+1) To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re:
> [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
> Reply=A0to: techassist@xxxxxxxxxxxxx
>
> 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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