[TechAssist] Re: "fix" update: tuner? philips/ Mag TS2754, 27B800-7562 shuts down, no vert. IC500...]

  • From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 20 Dec 2002 17:41:15 -0500

Entered service mode, copied down all values I found.i did the "default
to factory settings". This restored my tuner operation.The vert height
was narrow and v. centering needed adjusting. Did that Trouble is, they
say to save that page values press "smart" on the remote. I only have
the master remote that has no "smart" button. Is there an equiv. button
I can save this with? Seems after I doo all this even pulling power
(supposedly this saves data) it comes on with the narrow vert hgt again,
unsaved.I re read all the info on the disc.help...
Phil Bader

Philip Bader wrote:
> 
> see thread below: was shutting down,fixed vert,now no tuner op.
> 
> Unsolderd the eeprom chip IC346, powered the set up, and it now works
> OK. Note the vertical is a bit narrow, and probably several other
> parameters wrong, as the set is working without an EEPROM, so is working
> under "default" settings.At least I know I must reinitialise, or at
> worst replace the eeprom.Is it possible, and wise to reinstall the
> old,and enter service mode to record the orig. settings for when I wipe
> out  the chip to start over?
> Phil Bader
> 
>  Friday, December 20, 2002 11:47 AM
> update: tuner? philips/ Mag TS2754, 27B800-7562 shuts
> > > down, no vert. IC500...
> > >
> > > I replaced IC500 (TDA9302H), D409 (483513037094, NTE580) and resistor
> > > R420 (1 ohm). This restored vertical and stopped shut down. Now, the
> > > tuning is off frequency.I select ststions and may hear a bit of the
> > > audio but sound and pix if off tune. I do have my +33V, +5 and all other
> > > voltages to tuner (I have the force disc).SCL and SDA have pulse
> > > activity.
> > > Of course I suspect tuner, but any history on this chassis for this
> > > tuning defect?
> > > Phil Bader
> > >
> > > Philip Bader wrote:
> > > >
> > > > The usual IC500 solder breaks on pins destroy IC500 (TDA9302H) and Vcc
> > > > resistor to fly R420. What exactly is R420 value? 1 or 10 ohms??
> > > > Phil Bader
> > > > --
> 
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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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