[TechAssist] Re: RCA ProJo PTK169PABS
- From: tvdoctors@xxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: 20 Nov 2001 21:58:23 -0800
It won't run. It tries to start but just shuts down. Standby voltages seen
normal until I hit the power button. As I measure standby voltages when I turn
the set on, they drop about half. Neil
> ** Original Subject: [TechAssist] Re: RCA ProJo PTK169PABS
> ** Original Sender: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
> ** Original Date: Wed, 21 Nov 2001 00:37:05 -0500 (EST)
> ** Original Message follows...
>
> Neil:
> Is the voltage you are measuring in the Standby mode or in the Run mode?
>
> If so, What are the voltages at CR4106(K) & CR4101(K) with respect to hot
> ground in the Standby mode? Are any of the supply voltages pulsing at a 0.5
> to 1 second rate at U4101(15 & 16)
>
> Dennis Viereck
>
>
> tvdoctors@xxxxxxxxxxxxx wrote:
>
> > Didn't help! 130 goes to around 70. 12.6 goes to around 6.5 _15 and
> > positive 15 don't seem to go as low. Anything else to try. I do get a
> > spark like from a spark plug wire from the anode for about a second when
> > power button is hit. Neil
> >
> > > ** Original Subject: [TechAssist] Re: RCA ProJo PTK169PABS
> > > ** Original Sender: "Ron Miller" <rlmbkm@xxxxxxxx>
> > > ** Original Date: Tue, 20 Nov 2001 18:32:32 -0500 (EST)
> >
> > > ** Original Message follows...
> >
> > >
> > > B+ should be 143.5vdc change two caps to the left of U4101 a 2.2uf@100v
> > > and
> > > a 15uf @ 63v.,also check C4108 in base circuit of chopper.
> > > Ron Miller
> > > D.T.V. Texas
> > >
> > > ----- Original Message -----From: <tvdoctors@xxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Tuesday, November 20, 2001 5:03 PM
> > > Subject: [TechAssist] RCA ProJo PTK169PABS
> > >
> > >
> > > > OK here's the deal: I brought this projector module into my shop and
> > > found R767U open and R763U to be discolored. I replaced these with the
> > > high
> > > voltage splitter and checked other surrounding components. Set still won't
> > > activate. My B+ is 130 volts and all other secondary voltages are right on
> > > the track. I have a good pulse to the base of the horiz.. Output
> > > transistor.
> > > When I push the power button, I notice that the 130 volts gets loaded down
> > > to around 70 volts. If I disconnect the anode lead from the splitter and
> > > clip a lead from about a tenth of an inch from the lead to ground, it
> > > makes
> > > a spark once then shuts down, so I know my high voltage is trying to come
> > > up, but shuts down. I've checked the caps in the horiz.output collector
> > > circuit and they check good. The only thing I can find out of place is my
> > > 130 volt line is dropping down. Has anyone had a problem like this in the
> > > past? Could it be the flyback? Thanks for input on this. My customer
> > > would like to have this set back before Thanksgiving. Neil
> > > >
> > > > TV Doctors 108 W. Main St. Monroe,Wa. 98272 360-794-6469
> > > >
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> > >** --------- End Original Message ----------- **
> >
> > >
> >
> > TV Doctors 108 W. Main St. Monroe,Wa. 98272 360-794-6469
> >
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>** --------- End Original Message ----------- **
>
TV Doctors 108 W. Main St. Monroe,Wa. 98272 360-794-6469
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