[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 18 Oct 2005 22:00:13 -0400
Wayne, According to the sticker inside this is a CTC130A chassis. There are
two stand-up boards, one is a shielded tuner board called the MTT I'm told,
the other board is the VIPUR power supply. I do have horizontal pulses but
they are only present during the brief time the TV is on. As for Q601 I'm
not sure about this part of the circuit yet because I don't have the
schematic containing this ... yet. Thanks for the information Wayne, I will
look into some of the things you mention and get back to you and the group
if I discover anything I don't understand. David Lessard, Alexandria,
Ontario, mr_fixit@xxxxxxxxxxxx
----- Original Message -----
From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, October 18, 2005 8:09 AM
Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
Dead - Shorted HOT
> Let's go back to some basics, but first clear something for me:
> The PW vipur board was, supposedly, only used in the ctc130c chassis,
> and I can not find your model number anywhere (it's probably with my
> training manual). I see an FMR623 that is a ctc130a chassis.
>
> Does your variation have a separate power supply board using U2 to drive
Q1?
> Are you working with or without a schematic?
>
> I think the burp at unplug is normal.
> The "goldenrod" says pulsing is an over current shutdown condition for
> the "C" variation.
>
> Do you have any Horizontal pulses?
>
> As for Q601 and vicinity, I have highlighted R667, 100k 1/8w resistor,
> but no info added.
>
> Q601 is an on/off transistor, and should not pulse. U601p18 is 5v for
> the chip.
> There is a 6 pin plug, H602. Pin 6 is 11v standby from the chassis and
> is the main supply.
> Same plug, the blue wire should be pin 3, you need 90v pulses to develop
> the run supply.
>
> I have a heavy service call schedule today.
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
> David Lessard wrote:
> > 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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