[TechAssist] Re: [ Update ] RCA F35731MB CTC169JS6 - Shuts off when signal source is connected.

The average beam current probably goes down a little with the normal signal
source connected. That may cause the B+ to rise a little and trip an x-ray
shutdown. If you reduce the B+ a little and this eliminates the shutdown
that tells you if this is what was happening.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: "DAMON BRUNGER" <damoneb@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, May 31, 2005 8:06 AM
Subject: [TechAssist] Re: [ Update ] RCA F35731MB CTC169JS6 - Shuts off when
signal source is connected.


> I totally forgot about that.....I think I had to visually remember which
way
> the flat edge of the transistor was placed before installing a new one.
> I suspect the CRT may be pulling too much current, but it isn't the
> fault...it's gotta be triggering the
> X-ray or overcurrent sense line some how.
> Also, if you installed Q2906 backwards you'll need to re - replace it.
Been
> there, done that.
>
> Damon Brunger
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, May 31, 2005 5:47 AM
> Subject: [TechAssist] Re: [ Update ] RCA F35731MB CTC169JS6 - Shuts off
when
> signal source is connected.
>
>
> > Watch the board markings closely on that Q2906 LeRoy, seems to me it may
> > be marked one way on top and different on bottom.
> >
> >
> > ********************************
> > Since 1972                     *
> > Jim Myers                      *
> > Telrad Electronics             *
> > Fort Wayne Indiana             *
> > ********************************
> >
> >
> > LeRoy Westlund wrote:
> > > OK,...now I'm back to where I started.
> > > Menu is centered OK, speaker got itself shut off for some reason.
> > > I bypassed the PIP module, and it still shuts off.
> > > PIP module is not the problem.
> > > I'm pretty sure I'm looking at a luminance driver problem.
> > > Can Q2906 cause this, also ? I'll check that next.
> > >
> > > LLW
> > >
> > > LeRoy Westlund
> > > Westlund TV & Electronics
> > > 97 North Main                             " I forgot,..to remember,..
> > > Centerfield, UT 84622-0087           to forget "
> > > Ph./Fax  435-528-3822
> > > mailto:LLW@xxxxxxxxxx
> > >
> > > -----Original Message-----
> > > From: LeRoy Westlund <llw@xxxxxxxxxx>
> > > To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> > > Date: Monday, May 30, 2005 11:50 PM
> > > Subject: [ Update ] RCA F35731MB CTC169JS6 - Shuts off when
signalsource
> is
> > > connected.
> > >
> > >
> > >
> > >>I lost some ground after working on the PiP module.
> > >>I replaced U4 (+5 volt reg.), & R72 (25 ohms).
> > >>Set still shut off.
> > >>
> > >>The problem shifted a little. I lost my sound, and the Menu shifted
too
> far
> > >>to the left.
> > >>Now I have to go back and change the Horz caps as needed, again.
> > >>In the meantime,.....does anybody have a good used PiP module for this
> > >>chassis ?
> > >>Numbers on module are: 506107, 2079001-011, & 4W81034-201.
> > >>
> > >>LLW
> > >>
> > >>LeRoy Westlund
> > >>Westlund TV & Electronics
> > >>97 North Main                             " I forgot,..to remember,..
> > >>Centerfield, UT 84622-0087           to forget "
> > >>Ph./Fax  435-528-3822
> > >>mailto:LLW@xxxxxxxxxx
> > >>
> > >>-----Original Message-----
> > >>From: LeRoy Westlund <llw@xxxxxxxxxx>
> > >>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> > >>Date: Monday, May 30, 2005 9:43 PM
> > >>Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
> > >>signalsource is connected.
> > >>
> > >>
> > >>
> > >>>Damon,
> > >>>I already replaced the B+ cap. (470 @ 180).
> > >>>Right now, I am looking at the PiP module.
> > >>>R72 is overheated, and the +5 volt reg. IC4 may be bad.
> > >>>If I unplug P8002, the set will run with normal audio, but of course
it
> > >
> > > has
> > >
> > >>>no picture, so it don't shut down. I'm going to try a new +5 volt
reg.
> IC4
> > >>>on the PiP module.
> > >>>
> > >>>Later,
> > >>>LLW
> > >>>
> > >>>LeRoy Westlund
> > >>>Westlund TV & Electronics
> > >>>97 North Main                             " I forgot,..to remember,..
> > >>>Centerfield, UT 84622-0087           to forget "
> > >>>Ph./Fax  435-528-3822
> > >>>mailto:LLW@xxxxxxxxxx
> > >>>
> > >>>-----Original Message-----
> > >>>From: DAMON BRUNGER <damoneb@xxxxxxxxxxx>
> > >>>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> > >>>Date: Monday, May 30, 2005 8:48 PM
> > >>>Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
> > >>>signalsource is connected.
> > >>>
> > >>>
> > >>>
> > >>>>Hmmm, I'm not sure if that Hi Voltage is normal or not. I've never
> tested
> > >>>>the normal value on this set.
> > >>>>200V is a little low, Cr4118's 12V should be 14V after replacement,
> and I
> > >>>>think you said the B+ run was at 140V, which is a little low
> too....not
> > >>>
> > >>>much
> > >>>
> > >>>>tho'.
> > >>>>
> > >>>>Put your meter on the 143V diode located near the SMPS. It's closer
to
> > >
> > > the
> > >
> > >>>>SMPS than the back of the chassis, located kinda parallel to the
Horiz
> > >>
> > >>heat
> > >>
> > >>>>sink. Monitor the voltage for a few minutes. If you see that voltage
> > >>>>fluctuate by several volts then the 143V cap is dried out......that
> > >>
> > >>voltage
> > >>
> > >>>>should be rock solid 143V during run at all times.
> > >>>>I have had that cap cause all sorts of shutdown/turn on problems,
and
> I
> > >>
> > >>'ve
> > >>
> > >>>>just been seeing those go bad during the last 6 months.
> > >>>>
> > >>>>Damon Brunger
> > >>>>Telrad Electronics
> > >>>>Fort Wayne IN
> > >>>>----- Original Message -----
> > >>>>From: "LeRoy Westlund" <llw@xxxxxxxxxx>
> > >>>>To: <techassist@xxxxxxxxxxxxx>
> > >>>>Sent: Monday, May 30, 2005 9:03 PM
> > >>>>Subject: [TechAssist] RCA F35731MB CTC169JS6 - Shuts off when signal
> > >>
> > >>source
> > >>
> > >>>>is connected.
> > >>>>
> > >>>>
> > >>>>
> > >>>>>John,
> > >>>>>The Hi-voltage reads 31K.
> > >>>>>The 200 volt source reads 191.8 volts.
> > >>>>>The screen reads 312 volts.( turning it down, does not help ).
> > >>>>>Picture Geometry is perfect. Picture is NOT bowed. Looks perfect.
> > >>>>>
> > >>>>>LLW
> > >>>>>
> > >>>>>LeRoy Westlund
> > >>>>>Westlund TV & Electronics
> > >>>>>97 North Main                             " I forgot,..to
remember,..
> > >>>>>Centerfield, UT 84622-0087           to forget "
> > >>>>>Ph./Fax  435-528-3822
> > >>>>>mailto:LLW@xxxxxxxxxx
> > >>>>>
> > >>>>>-----Original Message-----
> > >>>>>From: John @ Myers TV <myers_tv_b@xxxxxxxxxxxxx>
> > >>>>>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> > >>>>>Date: Monday, May 30, 2005 7:07 PM
> > >>>>>Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
> > >>>>>signalsource is connected.
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>>Hi Leroy,
> > >>>>>>
> > >>>>>>What is your high voltage running at? Is the picture geometry OK?
> not
> > >>>>>>bowed in or out on the sides?
> > >>>>>>The next thing I would do is to change the rest of the horizontal
> > >>
> > >>output
> > >>
> > >>>>>>caps. Sorry, I don't have the part numbers here, but someone will
> > >>>>>>probably jump in with them. I think it is C4401, C4402, C4406)?
> > >>>>>>I'm thinking the timing of the hor output might be off.
> > >>>>>>
> > >>>>>>John Myers
> > >>>>>>Myers TV Service Co.
> > >>>>>>376 E. State St.
> > >>>>>>Alliance, OH 44601
> > >>>>>>
> > >>>>>>Voice / Fax: 330-821-6545
> > >>>>>>Myers_tv_b@xxxxxxxxxxxxx
> > >>>>>>http://www.myerstv.net
> > >>>>>>
> > >>>>>>Work as if you were to live a hundred years,
> > >>>>>>Pray as if you were to die tomorrow.
> > >>>>>>                          Ben Franklin
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>>LeRoy Westlund wrote:
> > >>>>>>
> > >>>>>>
> > >>>>>>>Hi members,
> > >>>>>>>This set will run all day with raster only. As soon as I hook up
a
> > >>>>
> > >>>>signal
> > >>>>
> > >>>>>>>source (Antenna, or external input), it will shut off after about
> 10
> > >>>>>>>seconds. Picture is beautiful, and all voltages from the power
> supply
> > >>>>
> > >>>>read
> > >>>>
> > >>>>>>>normal, for that length of time.
> > >>>>>>>When it shuts off, I have to unplug the power for at least 5
> minutes,
> > >>>>>
> > >>>>>before
> > >>>>>
> > >>>>>>>my standby voltages will return.
> > >>>>>>>
> > >>>>>>>Parts replaced so far, with OEM part numbers :
> > >>>>>>>Regulater chopper output. (200165)
> > >>>>>>>Regulator IC (200419)
> > >>>>>>>Regulator caps. (2.2 @ 100 195691),(15 @ 63 214756),(470 @ 35
> > >>>>
> > >>>>190496),(39
> > >>>>
> > >>>>>@
> > >>>>>
> > >>>>>>>100)
> > >>>>>>>Horz cap (.48 @ 250 197518), CR4118 (164589), C4703 (47 @ 250).
> > >>>>>>>B+ cap (470 @ 180 200147).
> > >>>>>>>Tested luminance buffer Q2906= OK.
> > >>>>>>>
> > >>>>>>>Voltage readings:
> > >>>>>>>B+ = standby = 143.2 (Run = 138.2)(adjusted B+ standby for 140,
no
> > >>>>
> > >>>>help).
> > >>>>
> > >>>>>>>CR4118 = standby = 13.4 ( Run = 12.1)
> > >>>>>>>Voltage  Q4101-Base = standby = -.19 ( Run = -1.4)
> > >>>>>>>
> > >>>>>>>If I pull the CRT socket, set will run OK, and not shut-off.
> > >>>>>>>Works the same on my 27" test jig in the shop, as it does hooked
up
> > >
> > > in
> > >
> > >>>>the
> > >>>>
> > >>>>>>>home, to the original Yoke / CRT load combination.
> > >>>>>>>
> > >>>>>>>Would it be wise to replace the IFT at this stage of the game ?
> > >>>
> > >>>Customer
> > >>>
> > >>>>>>>does not want to spend more then $200 for this repair. I may need
> to
> > >>>>>
> > >>>>>refund
> > >>>>>
> > >>>>>>>about $100-165, that I already collected. It worked for about 1/2
> > >
> > > hour
> > >
> > >>>>>when
> > >>>>>
> > >>>>>>>I first took it back, but, it went out again after customer
already
> > >>>
> > >>>paid
> > >>>
> > >>>>>me.
> > >>>>>
> > >>>>>>>Anymore help on this would be appreciated.
> > >>>>>>>LLW
> > >>>>>>>
> > >>>>>>>LeRoy Westlund
> > >>>>>>>Westlund TV & Electronics
> > >>>>>>>97 North Main                             " I forgot,..to
> remember,..
> > >>>>>>>Centerfield, UT 84622-0087           to forget "
> > >>>>>>>Ph./Fax  435-528-3822
> > >>>>>>>mailto:LLW@xxxxxxxxxx
> > >>>>>>>
> > >>>>>>>
> > >>>>>
> >
>
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