[TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
- From: "David Lessard" <mrfixit@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 7 Jan 2003 11:59:26 -0500
Barry, Just getting back from a call, no PIP on this model, thank-you so
much. How are you sending this? Mail?
David.
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Barry Thompson
Sent: Tuesday, January 07, 2003 2:26 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
I can send you a CTC 177 schematic in the morning. Does it have pip on it?
barrystv@xxxxxxx
Barrys TV
613 224 3406
Ottawa.Canada.
----- Original Message -----
From: "David Lessard" <mrfixit@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 07, 2003 12:35 AM
Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
>
> Using a RCA remote, I was not able to make the TV work with a composite
> video feed via the (yellow) input jack on the back. Just snow. I can trace
> the signal from the input jack to the T-Chip, pin #64 if I remember
> correctly. Recently I received a CTC177 training manual and symptoms list,
I
> am going through it now. Does anyone have any other thoughts of this
> problem? A schematic would really help. Thanks.
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Electric Medic
> Sent: Monday, January 06, 2003 11:33 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
>
>
>
> I don't know about selecting 00 or 90 or 91 on that set, I am sure it will
> work, but.... I would just use a remote and select the "Input" button.
Make
> sure you are selecting the "INPUTS". You need to confirm this most
important
> fact. If it does work on inputs using the input button on any RCA remote
> then probably U7401 Inside Tuner is bad. If not, I have seen the Varactor
> Tuning Diodes bad. There is a kit for those diodes, pretty common, maybe
> someone on here has the part number. If it doesn't really work on the
> inputs, forget all that I said, you have a dog.
>
> Perry Bower
> Electric Medic
> "It's Cheaper to Keep Her"
> http://www.electricmedic.com
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> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of David Lessard
> Sent: Monday, January 06, 2003 3:45 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
>
>
>
> Set doesn't receive ANY channels, stuck on channel 3 after autoprogram.
You
> can key in a channel via remote control, the channel indicator changes but
> no channel recieved. Switch to cable band, key in other channels, still
> nothing. I tried a direct composite feed via input jacks, still nothing, I
> believe the input channel for this is 90 or is it 91, regardless I tried
> both, no video via RCA inputs.
>
> BTW, there is only a 1.9Vpp horizontal pulse present at pin#38 of the
micro.
> How does this pulse get here, what could be attenuating it by .5 volts.
Does
> anyone have a schematic or a partial scan? I wish I had more experience
with
> RCA's :-)
>
> Someone else suggested this problem might be with the tuner control IC
> because the micro is responding to front panel buttons, does the
autoprogram
> thing when asked, OSG is working, but no channels. Or maybe the tuner IC
is
> defective. Any other thoughts RCA veterans.
>
> Thanks,
>
> David Lessard
> Alexandria Electronics
> Alexandria, Ontario
> mrfixit@xxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Wayne Vanaman
> Sent: Friday, January 03, 2003 9:25 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
>
>
>
> OK David, I am confused.
> What is the set doing? Do you get any channels, cable or air?
>
> Does this model have AV inputs? Do they work?
>
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
> ----- Original Message -----
> From: "David Lessard" <mrfixit@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, January 02, 2003 2:25 PM
> Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
>
>
> >
> > Al, I forgot to mention the screen looks unusually dark. Onscreen menu
> > graphics is OK, just the background image is dark, its just snow right
> now,
> > but yeah, its dark. I turned screen level on flyback but this adds too
> much
> > contrast to onscreen menu graphics. Any thoughts Sir?
> >
> > David Lessard
> > mrfixit@xxxxxxxxxxx
> > (613)525-4502
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of al m
> > Sent: Thursday, January 02, 2003 3:14 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
> >
> >
> >
> > David I've seen this before and it ended up being C3301. Pin 63 of T
chip
> is
> > where it comes out of, I have Q3301 for sync amp, 5.5V =B, 5V=E,
> > 8.5=C.Check pin 38 on micro for pulse, the one I had wasn't shaped
right
> > and the amplitude was low. Manual calls for 2.4V.
> > al marquardt
> > ampm@xxxxxxx
> >
> >
> > ----- Original Message -----
> > From: "David Lessard" <mrfixit@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, January 02, 2003 2:45 PM
> > Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
> >
> >
> > >
> > > Wayne:
> > >
> > > Thanks, your reply was very thorough, I love learning new stuff! You
> > > described exactly what is going on with this TV, in that it searches
> cable
> > > channels (14 - 125), finds nothing, then searches air channels (14 -
> 69),
> > > finds nothing, then sits there at channel 3. Either the tuner is not
> > working
> > > or the values aren't being stored. The scan time per channel is about
> > 500ms,
> > > so I would assume the problem is not with the tuner. The horizontal
sync
> > > pulses start from where? The tuner, sync seperation circuit, to which
> pin
> > on
> > > the micro? I will look at Q3305 buffer, what voltage values should I
> > expect
> > > to see here? Any other thoughts on this?
> > >
> > > Thanks.
> > >
> > > David Lessard
> > > Alexandria Electronics
> > > mrfixit@xxxxxxxxxxx
> > > (613)525-4502
> > >
> > > -----Original Message-----
> > > From: techassist-bounce@xxxxxxxxxxxxx
> > > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Wayne Vanaman
> > > Sent: Thursday, January 02, 2003 2:28 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
> > >
> > >
> > >
> > > David:
> > >
> > > The Thomson/RCA products in general start autoprograming at channel 14
> to
> > > determine if they are connected to cable. Although some will go all
the
> > way
> > > to 125 some will only go into the 30s or so. (They have been doing
this
> > > since about the ctc13x line) If no channels have been found by then
> they
> > go
> > > back to ch2 and in the Air position. Normal operation would be, then,
> > > 14-125, 2-13, retune the last channel the set was on. In the "air"
> mode,
> > > 14-something, then 2-69, retune the last channel.
> > >
> > > This way they don't need to be told Air or Cable.
> > >
> > > The channel is determined to be there if the horizontal sync pulse
> reaches
> > > the microprocessor. Unlike many other brands that look for the
3.58Mhz
> > > burst. This way if the Horizontal sync pulse has been suppressed, as
in
> > > cable company premium channels, the channel is determined to not be
> there,
> > > and is not stored in the scan list. Who wants to watch that anyway?
> > >
> > > A key here is that the sync pulse must reach the micro. If the
product
> is
> > > autoprogramed and the sync pulse does not reach the micro, or the
micro
> is
> > > defective, the set will default to the Air position with NO channels
> > stored
> > > in memory. The set will tune the channels if entered from a remote
> > control.
> > > The set can be put into the cable mode and the cable channels then
> direct
> > > entered. Here is another clue: If the tuning is Slow (most Thomson
> > > products will tune in the 200-400mS time frame), that is, it takes a
> > second
> > > or so to tune, then the sync pulse is not reaching the micro. The
most
> > > common cause of this is the failure of SMD Q3305.
> > >
> > > In your specific case, what is the problem.
> > >
> > >
> > > Wayne Vanaman
> > > Omega Electronics
> > > 6904 W Fairfield Dr
> > > Pensacola, Fl. 32506-3310
> > >
> > > Wayne@xxxxxxxxxxxxxxxxxxxxx
> > > WWW.PensacolaTVRepair.Com
> > >
> > > 850-456-5995 voice
> > > 850-458-6369 fax
> > > ----- Original Message -----
> > > From: "David Lessard" <mrfixit@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, January 02, 2003 1:02 PM
> > > Subject: [TechAssist] GE 27GT614JX1 Chassis CTC177BE
> > >
> > >
> > > >
> > > > Hi Techs,
> > > >
> > > > Haven't worked on a lot of these, tuner doesn't seem to function
> > properly.
> > > > When autoprogramming, channels 2 - 13 are skipped, it starts
scanning
> at
> > > > channel 14 up to 125. Audio is good. I can see the tuner was
reworked
> > > > (famous tuner shield problem). Is the problem likely the tuner
control
> > > IC?.
> > > > I have no information on this chassis. Any information would be
> greatly
> > > > appreciated, schematic or tips.
> > > >
> > > > Thanks Gentlemen.
> > > >
> > > > "Share what you know, Learn what you don't"
> > > >
> > > > David Lessard
> > > > Alexandria Electronics
> > > > 50 Harrison Street
> > > > Alexandria, Ontario
> > > > K0C-1A0
> > > > mrfixit@xxxxxxxxxxx
> > > >
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