Zenith TV SJ7935W Part question

[Tony Marsillo]

Does anyone know the crystal frequency for CR6200 in this set. Markings on
the crystal are:

224-74-02
KDS
9219

The TV will not respond to front panel input. This crystal is part of the
microcontroller circuit IC6000. I do not see any oscillator activity on the
pins of the IC that the crystal is on. I suppose the micro is bad, but would
like to sub the crystal with a junk box one to try.

Thanks

--
Tony Marsillo
Nutmeg Repair
-----------------------------------------------------------------

 

[David]

What about the rest of what the micro must have?
Good Ground, clean standby 5v dc, good reset signal.

Does the remote control work at all?

David

Tony Marsillo <tonymar@optonline.net> wrote in message
news:bhs0fp$2iqm1$1@ID-102725.news.uni-berlin.de...

Does anyone know the crystal frequency for CR6200 in this set. Markings on
the crystal are:

224-74-02
KDS
9219

The TV will not respond to front panel input. This crystal is part of the
microcontroller circuit IC6000. I do not see any oscillator activity on
the
pins of the IC that the crystal is on. I suppose the micro is bad, but
would
like to sub the crystal with a junk box one to try.

Thanks

--
Tony Marsillo
Nutmeg Repair
-----------------------------------------------------------------

 

[Andy Cuffe]

Tony Marsillo wrote:

Does anyone know the crystal frequency for CR6200 in this set. Markings on
the crystal are:

224-74-02
KDS
9219

The TV will not respond to front panel input. This crystal is part of the
microcontroller circuit IC6000. I do not see any oscillator activity on the
pins of the IC that the crystal is on. I suppose the micro is bad, but would
like to sub the crystal with a junk box one to try.

Thanks

--
Tony Marsillo
Nutmeg Repair
-----------------------------------------------------------------

I don't know what frequency it is, but you could probably try a sub or
two just to see if it oscillates. Something is the 4-12MHz range is
typical. If it is bad, I might have one on a junk board.
--
Andy Cuffe
baltimora@psu.edu

 

[Tony Marsillo]

Thanks Andy,
I did try a 3.57 MHz crystal but it did not work. Will look for a few more
to try.

--
Tony Marsillo
Nutmeg Repair
-----------------------------------------------------------------
"Andy Cuffe" <baltimora@psu.edu> wrote in message
news:3F41B4EA.1340@psu.edu...

Tony Marsillo wrote:

Does anyone know the crystal frequency for CR6200 in this set. Markings
on
the crystal are:

224-74-02
KDS
9219

The TV will not respond to front panel input. This crystal is part of
the
microcontroller circuit IC6000. I do not see any oscillator activity on
the
pins of the IC that the crystal is on. I suppose the micro is bad, but
would
like to sub the crystal with a junk box one to try.

Thanks

--
Tony Marsillo
Nutmeg Repair
-----------------------------------------------------------------


I don't know what frequency it is, but you could probably try a sub or
two just to see if it oscillates. Something is the 4-12MHz range is
typical. If it is bad, I might have one on a junk board.
--
Andy Cuffe
baltimora@psu.edu