[TechAssist] Re: RCA - 27"TV - PMR623ER - CTC130A - Ded - Shorted HOT
- From: mebonnell@xxxxxxxxx (Old TV Man)
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 17 Oct 2005 22:50:52 -0500
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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