[TechAssist] Re: Fwd: CTC176F2 problems
- From: "becyn" <becyn@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 27 Oct 2003 13:32:51 -0500
Ok, that sounds right, but didn't you say that your scan-derived voltages
were low?
If they are good, and you changed all that stuff, the only thing that comes
to mind is ABL.
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: Saturday, October 25, 2003 10:30 AM
Subject: [TechAssist] Re: Fwd: CTC176F2 problems
>
>
> Changed flyback. High voltage 27kv, B+ 135 at HOT. In SMPS 147v. No
> change , same problems.
>
>
>
>
>
>
>
>
> 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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