[TechAssist] Re: fix Re: GE 25GT522, CTC177AF2 powers up 3 times,dead.

  • From: "al m" <ampm@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 25 Feb 2004 12:33:04 -0500

That's what I'm talking about and usually 13 or 14.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: "peggs" <peggs@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, February 25, 2004 1:35 PM
Subject: [TechAssist] Re: fix Re: GE 25GT522, CTC177AF2 powers up 3
times,dead.


> I've seen settings between 10-20.
> I think it varies chassis-to-chassis(not sure why,but...)
> Anyway,I've noticed that the Setting for Parameter One(H. Oscillator)
> is always the value before the Screen Angle shifts from angling to the
> Right,to angling to the Left(the last to-the-Right setting).
> IOW,when it shifts to the Left,step back One setting,to the Last
> Right Angle Setting.
> When I have had to align an EEProm,this setting is always easy.
>
> I've tried numerous times(stepping down one setting,out of curiousity)
> when copying Parameter settings, before EEprom replacement.
> Not once have I seen it different.
>
> Peggs
>
> At 06:29 AM 2/25/04, al m wrote:
> >The horizontal setting is always 13 or 14 if that doesn't straighten it
out
> >you got another problem.
> >Al Marquardt
> >ampm@xxxxxxx
> >Al Marquardt Electronic Repair
> >206 W Main
> >Girardville Pa. 17935
> >----- Original Message -----
> >From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Wednesday, February 25, 2004 9:18 AM
> >Subject: [TechAssist] Re: fix Re: GE 25GT522, CTC177AF2 powers up 3
> >times,dead.
> >
> >
> > > I now understand in retrospect.
> > > Remember I said with the new eeprom, the set came on, but the
horizontal
> >freq was off? (due to the incorrect value of the new eeprom's horiz freq
> >setting)
> > > Another words, "detuned". A detuned resonant circuit is less
effecient, so
> >with the horiz freq off, that affected the high voltage, lowering it,
> >allowing it to stay on. As I brought it closer to correct frequency, the
HV
> >increased, until it exceeded the normal amount and triggered shutdown.
> > > The open scan cap was allowing excess HV. My replacement eeprom with
it's
> >H. freq "off" just masked the actual problem.
> > > Does this explain it better?
> > > It threw me also for awhile.
> > > Phil
> > >
> > > Paul wrote:
> > >
> > > > Phil, If the set stayed on after replacing the eeprom, why did C4402
> >need replacing? Did I miss something somewhere? If C4402 was the cause of
> >the problem would it not still cause the same problem with a different
> >eeprom? Are you saying the eeprom made up for an open timing cap?
> >Paul
> > > > Phil Bader <tjanphyl@xxxxxxxxxxxxxxx> wrote:I threw an eeprom
> >in(slightly different ctc177 model) and the set stayed on...out
> > > > of horiz. hold. I managed to enter the service menu and get to
parameter
> >one, H,
> > > > freq. Just as I had it close the H. oscillator dropped out.
> > > > I attached an external scan cap (just something out of my cap box,
like
> >a
> > > > .001@2kv) and it fired up with good picture.
> > > > This told me a timing scan cap somewhere was bad.
> > > > I located C4402 ,a .0115mfd@1600V (RCA# 223177). It was open.
> > > > Replaced C4402 as the fix
> > > > .
> > > > Philip Bader
> > > > Jan Phyl TV Inc. (estab. 1976)
> > > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > > Fax (863) 299-8821
> > > > email: tjanphyl@xxxxxxxxxxxxxxx
> > > > Phil
> > > >
> > > > peggs wrote:
> > > >
> > > > > throw an 8 pin socket in, and try a new EEProm
> > > > >
> > > > > Peggs
> > > > >
> > > > > At 10:37 AM 2/24/04, Phil Bader wrote:
> > > > > >Plug it in, the SMPS has the usual chirp, and the HOT collector
is at
> > > > > >about +148 VDC in standby. Push power while monitoring the HV
anode
> >and
> > > > > >it turns on, HV comes up to about 25KV, instantly clicks off,
clicks
> >on
> > > > > >again in half second, off, then a third try, then dead. I didn't
see
> >a
> > > > > >bad fly with HV coming up OK.
> > > > > > I checked all diodes, found no shorts.
> > > > > >Histories?
> > > > > >
> > > > > >Phil
> > > > > >
> > > > > >--
> > > > > >
> > > > > >Philip Bader
> > > > > >Jan Phyl TV Inc. (estab. 1976)
> > > > > >3420 Recker Hwy. Winter Haven, Fl. 33880
> > > > > >Fax (863) 299-8821
> > > > > >email: tjanphyl@xxxxxxxxxxxxxxx
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> >
>---------------------------------------------------------------------------
> >--
> > > > > >Lost Password:
> > > > > >http://www.tech-assist.org and select "Login Problems?".
> > > > > >Email Archives:
> > > > > >//www.freelists.org/archives/techassist/
> > > > >
> > > >
> >
> --------------------------------------------------------------------------
> >---
> > > > > Lost Password:
> > > > > http://www.tech-assist.org and select "Login Problems?".
> > > > > Email Archives:
> > > > > //www.freelists.org/archives/techassist/
> > > >
> > > > --
> > > >
> > >
> >
> --------------------------------------------------------------------------
> >---
> > > > Lost Password:
> > > > http://www.tech-assist.org and select "Login Problems?".
> > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > > >
> > > > Paul ,B
> >Central TV&Video
> >Grover Beach Ca.
> > > >
> > >
> >
> --------------------------------------------------------------------------
> >---
> > > > Lost Password:
> > > > http://www.tech-assist.org  and select "Login Problems?".
> > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > >
> > > --
> > >
> > > Philip Bader
> > > Jan Phyl TV Inc. (estab. 1976)
> > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > Fax (863) 299-8821
> > > email: tjanphyl@xxxxxxxxxxxxxxx
> > >
> > >
> > >
> > >
> >
> --------------------------------------------------------------------------
> >---
> > > Lost Password:
> > > http://www.tech-assist.org  and select "Login Problems?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> > >
> > >
> >
> >
> >
>
>---------------------------------------------------------------------------
--
> >Lost Password:
> >http://www.tech-assist.org  and select "Login Problems?".
> >Email Archives:
> >//www.freelists.org/archives/techassist/
>
>
> --------------------------------------------------------------------------
---
> Lost Password:
> http://www.tech-assist.org  and select "Login Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/
>
>



-----------------------------------------------------------------------------
Lost Password:
http://www.tech-assist.org  and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/

Other related posts:

  1. Home
  2. techassist
  3. Archive
  4. 02-2004