[TechAssist] Re: RCA p52929
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 11 Nov 2001 21:37:13 -0500
That's way too hot, it must be shorted.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Jonas Miglinas" <miglinasj@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, November 11, 2001 1:49 PM
Subject: [TechAssist] Re: RCA p52929
>
> Thanks Dennis for the advice and the tip, this wouldn't be so bad if it
> wasn't so damn intermittent.One thing I did notice, the two ic's inside
the
> tuner can get pretty warm, especially U17501.(can't hold finger on it
after
> ~10 seconds) Is this normal? Never had problem with the tuner in any
> manner.
> Hope you have a quiet sunday.
> Regards Jonas
> ----- Original Message -----
> From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, November 11, 2001 10:08 AM
> Subject: [TechAssist] Re: RCA p52929
>
>
> >
> > I have had several peripherals cause the data or clock line to short to
> ground.
> > In this method you can now isolate all peripherals from the Run
data/clock
> > lines. The Digicon, PIP, Combfilter, T4 chip, AV switch, ... anything
that
> > attaches to the buss can cause this problem. The best thing is to
isolate
> > everything that is easy to isolate first. But remember both line must be
> high as
> > long as you have jw12410 removed and U13101(3 & 4) isolated.
> >
> > Good luck
> >
> > Dennis
> >
> > ps; My last problem child like this one was the PIP module. I had a
> surface
> > mounted capacitor leaky causing the data line to be sitting at 2.2
volts.
> >
> > Jones Miglinas wrote:
> >
> > > Hi Dennis,
> > > I cut 12410 and got 12 + 5 volts back, set did not turn on. Floated
> pins
> > > 3+4 and got 5v at pin 4, missing 5v at pin three. Started to trace and
> > > voltage would come back. Bending , hitting, and freezing board doesn't
> seem
> > > to affect the 5v in one way or another. I checked the K20 area and it
> seems
> > > solid. Have you ever had missing data/clock due to bad convergence
> board?
> > > Any and all suggestions would be greatly appreciated.
> > > Regards Jonas
> > > ----- Original Message -----
> > > From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Wednesday, November 07, 2001 12:33 AM
> > > Subject: [TechAssist] Re: RCA p52929
> > >
> > > >
> > > > Error code 16 means, "RUN buss stuck to a Logic low"
> > > >
> > > > To check that circuit, carefully cut the jumper JW12410 located next
> to
> > > the square metal shield that surrounds the Main Microprocessor.
> > > > By cutting this jumper you have just turned on the U14701 the 5 and
12
> > > volt regulator.
> > > > Be sure you have these voltages. If these are OK then try to turn on
> the
> > > TV.
> > > >
> > > > If it turns on test play the set a while. See if it operates
> correctly. If
> > > so you may have to perform an upgrade on the F2PIP reset circuit.
> > > >
> > > > If It still will not turn on then float the pins on U13101(3 & 4)
and
> > > measure the voltage on the foil pads. THEY BOTH MUST BE 5 VOLTS!. If
not
> > > you'll have to trace these lines and isolate them until you get the 5
> volts
> > > back. Note: If someone has previously worked on the tuner then I would
> start
> > > there and check coordinates K20. This is an area where the data and
> clock
> > > line make a 90 degree turn out from under the shield. This trace is so
> close
> > > to the shield it sometimes gets touched with solder in the process of
> > > reattaching the shields for the tuner.
> > > >
> > > > Let me know if you need any other information on this unit.
> > > >
> > > > Denins
> > > >
> > > > Jonas Miglinas wrote:
> > > >
> > > > > Hi all,
> > > > > I have a ctc195 chassis that is less than a year old that will
shut
> off
> > > and won't start (not even a click) and will stay off from 5 minutes to
> 5hrs
> > > or so. this symptom can occur from 1 to two times a day to 1 time a
> week.
> > > Chipper shows error code "16" ,run or data lines clamped to logic
"0".I
> do
> > > get Stnby voltages of 16 + 33 + 140+ -12 . Whats missing are the +5
and
> +12
> > > from U14701.Pressing power, pin 19 of u13101 tries to go high but only
> > > reches 1.3v The outputs of U14701 at Stnby ~ 1v at power on may reach
> ~3v.
> > > I've changed U14701, U14101, Q14101, U3101, and the T4 chip. Also
> checked
> > > y13101 and its associated circuitry. Substituted Gemstar fom another
> like
> > > model and that checked out ok.
> > > > > Any suggestions would be greatly appreciated.
> > > > > Regards Jonas
> > > > >
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