[TechAssist] Re: follow up fix: RCA Colortrak projo model PPR475T (chassis?...
- From: MDileo0000@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 9 Apr 2004 09:41:18 EDT
Hi, Phil
A higher current fuse may be all it needs. But, you may have arcover from the
ulter to ground on one of the crts causing the fuse to open. You might try
looking for corona or passing a grounded screwdriver around the high voltage
area to draw a discharge.
Dominic DiLeo
Atlantic TV
Freeport, Maine
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
In a message dated 4/9/04 8:47:25 AM Eastern Daylight Time,
tjanphyl@xxxxxxxxxxxxxxx writes:
>
> 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
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