[TechAssist] Re: Fwd: CTC176F2 problems
- From: Kenny Barnes <kennyb@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 25 Oct 2003 10:30:15 -0500
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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