[TechAssist] Re: Fwd: CTC176F2 problems
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 31 Oct 2003 12:34:36 -0800 (PST)
Kenny, a couple of thoughts I assume that you have checked for bad solder
joints every where applicable and looked for spilled liquid in the area of the
controls in the front of the board. The cause of no sound may not be related.
Have had those models with no sound because the internal speakers were in the
off mode. Sounds like you have a real dog. Good luck. Paul
Kenny Barnes <kennyb@xxxxxxxxxxxx> wrote:
Ok, I checked that out but remember I don't have any sound either.
>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"
>To:
>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"
> > >To:
> > >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"
> > > > >To:
> > > > >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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Paul ,B
Central TV&Video
Grover Beach Ca.
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