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

  • From: peggs <peggs@xxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx,"techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 20 Dec 2002 15:35:03 -0600

If I'm not mistaken,the new Philips EEproms are pre-programmed.
At least they are in the Y chassis,not sure in your B chassis,doesn't
sound like it is, in your case

Peggs

At 03:21 PM 12/20/02 -0500, 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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