[TechAssist] Re: GE 27GT614JX1 Chassis CTC177BE
- From: "David Lessard" <mrfixit@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 2 Jan 2003 15:25:05 -0500
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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