[TechAssist] Re: RCA p52929
- From: "Jonas Miglinas" <miglinasj@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 16 Dec 2001 11:46:37 -0600
Hi Dennis,
With your advice I checked every smd that was connected to ground in the
clock line. It ended up being one of the caps in the Digicon circuit.(can't
tell you which one, I lifted each one and cleaned the glue off , and they
all checked ok on my meter)
It has been over a month since I returned the set and it hasn't quit even
once,(although the client now says the Gemstar menu disappears when
selected,( will get to it after the holidays))
Just wanted to thank you for the advice and the encouragement, and wish
you a safe happy holiday and a peacefull profitable new year
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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