[TechAssist] Re: Fwd: CTC176F2 problems

Is the B+ still dropping?
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: "Kenny Barnes" <kennyb@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, October 31, 2003 11:53 AM
Subject: [TechAssist] Re: Fwd: CTC176F2 problems


>
> Since changing the fly back,scan derived voltages are OK.  Have not found
> the problem yet.TIA
>
>
>
>
>
>
>
>
>
> At 07:09 PM 10/24/03 -0400, you wrote:
> >Kenny,
> >
> >I don't understand how you can have 27 KV if the B+ is pulled down to
114V
> >from 140V.
> >The HV should be down by the same percentage. HV should therefore be
around
> >21 to 22KV. recheck it.
> >
> >Check the SMPS by loading it with a 40W light bulb for a few seconds.I
have
> >never seen the smps have a feedback problem in these sets , but there's
> >always a first...
> >
> >All the other weirdness may be due to the low voltage condition
originating
> >from the HVT.
> >
> >Bad HVT's are not unusual for this chassis.
> >
> >Jim McVey
> >McVey Alltronix
> >327 Broadway
> >Newburgh Ny 12550
> >ph: 845 561 8383
> >fx: 845 561 9017
> >Consumer electronics &
> >computer service.
> >Factory authorized for
> >over twenty brands.
> >----- Original Message -----
> >From: "Kenny Barnes" <kennyb@xxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Friday, October 24, 2003 3:08 PM
> >Subject: [TechAssist] Re: Fwd: CTC176F2 problems
> >
> >
> > > Jim..Changed Eprom and T chip, advised by other techs.  Don't think
IHVT
> >is
> > > shorted or there is a drain on secondary of the HVT.  The hi-voltage
is 27
> > > kv and the HOT is normal.  Not hot.  Remember no sound, no picture,
raster
> > > dark.  Turn up screen control and see a raster.
> > >
> > >
> > >
> > >
> > >
> > >
> > > At 07:56 PM 10/23/03 -0400, you wrote:
> > > >first of all, why did you change the T chip and eeprom for a voltage
> > > >problem???
> > > >
> > > >My guess is a partially shorted IHVT or a severe drain on the
secondary
> >of
> > > >the HVT, such as a bad cap or diode. Does the H-out get especially
hot?
> > > >
> > > >Jim McVey
> > > >McVey Alltronix
> > > >327 Broadway
> > > >Newburgh Ny 12550
> > > >ph: 845 561 8383
> > > >fx: 845 561 9017
> > > >Consumer electronics &
> > > >computer service.
> > > >Factory authorized for
> > > >over twenty brands.
> > > >----- Original Message -----
> > > >From: "Kenny Barnes" <kennyb@xxxxxxxxxxxx>
> > > >To: <techassist@xxxxxxxxxxxxx>
> > > >Sent: Thursday, October 23, 2003 12:05 PM
> > > >Subject: [TechAssist] Fwd: CTC176F2 problems
> > > >
> > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Changed eprom, T chip 1001,still have same problems.  Any help
here??
> >TIA
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > >Have RCA Model # F20352SF, CTC176F2.  Set came in dead.  Replaced
> > > >capacitor
> > > > > >C4105,10MFD/200v.  Set came on when plugged in.  Can not turn set
> >off.
> > > >No
> > > > > >sound,no picture.  Raster dark.  Has high voltage,27kv. draws 1.5
> > > > > >amps.  When set is on B+ voltage drops down to 114 volts.  Should
be
> >140
> > > > > >volts.  the 140 volts feeds HOT thru flyback.  Consequently all
scan
> > > > > >derived voltages off of flyback are low.  Disconnect HOT then
voltage
> >off
> > > > > >secondary of SMPS is 144 volts.  Any help here??TIA
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >Kenny Barnes
> > > > > >Kenny Barnes tv
> > > > > >928 South Marshall st.
> > > > > >5154325250
> > > > > >Boone, Iowa 50036
> > > > >
> > > > >
> > > > >
> > >
> >
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