[TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 6 Jan 2003 15:38:28 -0600
Peggs is correct, input is channel 00. The older sets, prior to the FCC
adding channels, did take inputs on 90 through 93, depending on how many
inputs were there.
Send me a fax number and I will send you the tuner and maybe some other
stuff.
The IC u7301 mixer/osc is a relatively high failure part. Frequently it
will only loose a band, though. PN 215532.
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: "peggs" <peggs@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 06, 2003 3:03 PM
Subject: [TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
>
> 00 is the A/V input channel.
> Check B+ to SM IC(TSA5515 pin 10) under bottom Tuner shield.
> Should be 5v.
> If it is too high,back up to SM Transistor Q4106,5v regulator
> to the left of Tuner section.........check voltages.
> If too high,check SM Resistor in Base of Q4106,should be 100 ohms.
> I had one that had increased to over 20K.
> If I'm on the right track,replacing this resistor will get the
> 5v back properly,but the symptom may remain.
> Replacing the SM IC,TSA5515(or is that 5513 ???) should fix the set
>
> Peggs
>
> At 03:45 PM 1/6/03 -0500, David Lessard wrote:
> >
> >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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> >
> Peggs' Electronics
> 1519 West 2nd Street
> Owensboro,KY 42301
> 270-926-4968
> fax 270-686-7399
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