[TechAssist] Re: GE - 31GT657FM1, Chassis CTC177CC

  • From: "Webster TV" <webstertv@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 14 Jan 2002 15:46:32 -0600

Bill,

I'd resolder all the grounds in the tuner circuit and then change the eeprom
IC the eeprom is # 218404 for a CTC177CC chassis. I presume you've done this
precedure before, as its a common problem with all these RCA/GE sets .
Programming the new eeprom takes the most time, as the new eeprom has all
parameters set to mid range.

                                                Good Luck!
                                                Dan Webster
----- Original Message -----
From: Premium Technologies <premtech@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 14, 2002 2:40 PM
Subject: [TechAssist] Re: GE - 31GT657FM1, Chassis CTC177CC


> Dan,
> I have merely a thin vertical line about 1/4 (1/3) of the way down from
the top of the screen.  I've previously replace u4501 and changed-out r4511
on your recent tip.  No change...
> I'll try resoldering the ground next, in the tuner.  I think my voltage is
a bit high on pins 4 and 5 of rn4501 (20v), but I don't believe that of
itself should collapse the vertical.
> Thanks for the help...
> Bill
> Premium Technologies
> Ocean Park, Washington
>   ----- Original Message -----
>   From: Webster TV
>   To: techassist@xxxxxxxxxxxxx
>   Sent: Monday, January 14, 2002 7:58 AM
>   Subject: [TechAssist] Re: GE - 31GT657FM1, Chassis CTC177CC
>
>
>
>   Bill,
>   Don't fully understand your problem. Do you have vert. deflection and
just
>   have a line across screen or don't you have vert. deflection and the
vert.
>   line is 1/4 of the way down screen instead of across middle? Here's one
tip
>   on a CTC177 for a vert. line but line is 1/3 of the way up screen.
Defective
>   U4501 and bad resister R4511(1ohm-2w)off of pin 2 of  U4501. Also a
>   defective eprom caused by bad tuner grounds can cause all kinds of
problems,
>   including vert. problems.
>
>                                                   Dan Webster
>                                                   Webster's TV
>                                                   Shullsburg, Wi
>
>   ----- Original Message -----
>   From: Premium Technologies <premtech@xxxxxxxxxxxxxx>
>   To: <techassist@xxxxxxxxxxxxx>
>   Sent: Sunday, January 13, 2002 3:09 PM
>   Subject: [TechAssist] GE - 31GT657FM1, Chassis CTC177CC
>
>
>   > Content-Type: text/plain;
>   > charset="Windows-1252"
>   > Content-Transfer-Encoding: quoted-printable
>   >
>   > BlankGentlemen,
>   > I'm having an elusive vertical problem with the above described which
is =
>   > producing a horizontal line 1/4 of the way down from the top of the =
>   > screen.  No schematic on this one, but from past experience it seems
my =
>   > in voltage might be low on the vertical deflector U4501.
>   > I've replaced U4501,  and about 8 of caps in that circuit, (C-4502, =
>   > 4108, 4107, 4506, 4505, 4705, 4112, 4404) with no change in symptoms.
=
>   > My voltage readings on pin 1 and 2 of U4501 are 13.4 and 24.7 =
>   > respectively, and 23.0 on 5-Vout.
>   > I've traced circuit for open shorts with no luck, and quickly running
=
>   > out of patience.  Any help would be appreciated...
>   > Bill
>   > Premium Technologies
>   > Ocean Park, Washington
>   >
>   >
>   >
>   >
>   >
>   >
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