[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 09:29:01 -0500

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
> > > >
> > > >
> > > >
> > > >
> > >
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> > Paul ,B
Central TV&Video
Grover Beach Ca.
> >
>
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> --
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
>
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