[TechAssist] Re: RCA p52929
- From: "Jonas Miglinas" <miglinasj@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 11 Nov 2001 12:49:53 -0600
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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