[TechAssist] Re: follow up fix: RCA Colortrak projo model PPR475T (chassis?) sound, no pix
- From: "Tel-Tek" <teltek3@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 9 Apr 2004 08:56:21 -0400
Does that set not use the Chopper Output circuit?
-Ed-
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
----- Original Message -----
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, April 09, 2004 8:45 AM
Subject: [TechAssist] follow up fix: RCA Colortrak projo model PPR475T
(chassis?) sound, no pix
> This fixed TV played all afternoon. I accedentally left it on after
> closing. It was running, I guess all night. Came in this morning, and
> same orig. issue: No picture/or HV.
> Opened it and the same fuse was open: F904. I replaced it again and the
> set works good again. This is an old set. Perhaps slightly increasing
> the fuse's current a bit to allow for possible component aging ? Orig.
> fuse was a 1.5A. Would a 2A be out of line? The set was warm to the
> touch this morning, so I believe it must have ran all night until a few
> hrs ago.Probably ran 12 hrs.
> The reg. circuit this fuse is in is right on the money.
> Phil Bader
>
> Phil Bader wrote:
>
> >Correction: Fuse should be F904,(not R904)and was a 1.5A (1500ma)GMA.
> >Phil
> >
> >Phil Bader wrote:
> >
> >
> >
> >>Thanks to Al's pdf files, i located an open fuse on the PS module. R904,
> >>1.5 amp GMA. I tested all around this fuse circuit,Q902 regulator it
> >>feeds,etc. All good.
> >>This was in the +127 VDC source to connector GB pin 3. It goes on the
> >>the HOT/fly ckt. Seems just material fatigue. I used a 1.8 amp. Also the
> >>convergence module needed all the transistors resoldered (tapping on
> >>this caused the convergence to go crazey).
> >>I resoldered a lot of the deflection board.
> >>Nicotine was thick on all the optics. Inside of screen was brown. Lots
> >>of cleaning.
> >>Actually looks 100% better than it could have for years.
> >>Thanks.
> >>Phil Bader
> >>
> >>al m wrote:
> >>
> >>
> >>
> >>
> >>
> >>>Phil there is a fuse F701 going to Pin 9.you are checking the high
voltage
> >>>drive circuit. Will send scan
> >>>Al Marquardt
> >>>ampm@xxxxxxx
> >>>Al Marquardt Electronic Repair
> >>>206 W Main
> >>>Girardville Pa. 17935
> >>>----- Original Message -----
> >>>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >>>To: <techassist@xxxxxxxxxxxxx>
> >>>Sent: Wednesday, April 07, 2004 12:47 PM
> >>>Subject: [TechAssist] Re: RCA Colortrak projo model PPR475T (chassis?)
> >>>sound, no pix
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>I can power it on with sound, recieves cable, stereo led indicates
> >>>>stereo signal. No HV.
> >>>>A few checks:
> >>>>H. driver transistor Q703 has +124 VDC collector.
> >>>>HOT (?) Q704 no B+ at collector. Is NOT shorted, has diode action with
> >>>>meter.
> >>>>Large cap C904 has +122VDC.
> >>>>Flyback pin 9 "B+" has no voltage on it.
> >>>>Connector GB pin 3 has zero volts. (seems to be a B+ piont)
> >>>>BTW this seems the same as the PPP400 and PPR500 models. All Hitachi
> >>>>VP6X chassis.
> >>>>Any notes ?
> >>>>Thanks,
> >>>>All for now.
> >>>>Phil Bader
> >>>>
> >>>>al m wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Phil I've got a VP6X manual on paper. What do you need?
> >>>>>Al Marquardt
> >>>>>ampm@xxxxxxx
> >>>>>Al Marquardt Electronic Repair
> >>>>>206 W Main
> >>>>>Girardville Pa. 17935
> >>>>>----- Original Message -----
> >>>>>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>Sent: Wednesday, April 07, 2004 12:17 PM
> >>>>>Subject: [TechAssist] Re: RCA Colortrak projo model PPR475T
(chassis?)
> >>>>>sound, no pix
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Internally, it has a ID tag:
> >>>>>>Hitachi VP6X chassis.
> >>>>>>Phil Bader
> >>>>>>
> >>>>>>Phil Bader wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>This has got to be 15+ yrs old.Wood cabinet. "ColorTrak".
> >>>>>>>Any one old enough to have histories on this one?
> >>>>>>>;-)
> >>>>>>>Phil Bader
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>--
> >>>>>>
> >>>>>>Philip Bader
> >>>>>>Jan Phyl TV Inc. (estab. 1976)
> >>>>>>3420 Recker Hwy. Winter Haven, Fl. 33880
> >>>>>>Fax (863) 299-8821
> >>>>>>email: tjanphyl@xxxxxxxxxxxxxxx
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
>
>>>>>-----------------------------------------------------------------------
---
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>---
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Lost Password:
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> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
>
>>>>------------------------------------------------------------------------
---
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>--
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>>Lost Password:
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> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>--
> >>>>
> >>>>Philip Bader
> >>>>Jan Phyl TV Inc. (estab. 1976)
> >>>>3420 Recker Hwy. Winter Haven, Fl. 33880
> >>>>Fax (863) 299-8821
> >>>>email: tjanphyl@xxxxxxxxxxxxxxx
> >>>>
> >>>>
> >>>>
>
>>>>------------------------------------------------------------------------
--
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>---
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
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> >>>>
>
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> >>>
> >>
> >>
> >>
> >>
> >
> >
> >
>
> --
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
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