[TechAssist] Re: RCA p52929
- From: "Jonas Miglinas" <miglinasj@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 11 Nov 2001 09:50:24 -0600
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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>
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