[TechAssist] Re: RCA ProJo PTK169PABS
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 21 Nov 2001 02:11:00 -0500
Let's break this problem down: 1st with the HV splitter disconnected it
still dies right?
Disconnect the B+ diode, isolating the power supply and the horiz
output/IHVT.
Still die? Or does it run? Check the B+ run voltage using a 60-80 watt bulb
connected to the diode. Is it running at 143 to 146 volts with the bulb on
it??
Ok, reconnect the diode to the horiz circuit and disconnect the horiz
output. turn it on. Does B+ drop to 70v? Check caps or ihvt if it does, if
not then put your HOT back online and fire it up. If it now fails, which it
will then suspect your IHVT....but check your secondary supplies on the
IHVT, your 200v diode is most likely failure, but you also have other low
voltage supplies coming off of it.
Hope this helps to isolate it further.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: <tvdoctors@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 20, 2001 11:35 PM
Subject: [TechAssist] Re: RCA ProJo PTK169PABS
> 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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