UPDATE: Zenith TV B25A10Z 9-2064 No Color

[Brad]

Hi,
Update, More Information (9-2064, not 2065) Sams 4265:

I found a schm. for a different model Zenth that has the TA1268N
(56 pin) IF/Video Processor IC. The P-P chroma signal input on
pin 45 is well below the .8V P-P on schm. I wicked out the pin to
see if it is "pulling down" the signal. It isn't (no change). The crystal
CR2201 is oscillating at 3.580.245 (around), not 3.579.454 using a
network TV signal into tuner.

The schematic, Profax 3202 from a service magazine, does NOT show
the source for the chroma signal to pin 45 of ICX2200.

Original message:

I have a Zenith TV 9-2064 (mfg 1999) in my shop, no color, good
B&W (I checked color setting). However, the menu is in color. This could
have been caused by a power surge, but the customer isn't sure. I do not
have schm. What is the most likely cause?

Thanks in advance, Brad

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[RonKZ650]

The video and color signal come off pin 41, then split off into separate video
and color amps. The color from pin 41 goes to R2260, Q2208, R2261, C2236, C2235
then to pin 45 in that order. You either have a bad chip or one of these
components is bad. I've seen these suface mount caps and resistors open. Very
rare though.
Ron

Hi,
Update, More Information (9-2064, not 2065) Sams 4265:

I found a schm. for a different model Zenth that has the TA1268N
(56 pin) IF/Video Processor IC. The P-P chroma signal input on
pin 45 is well below the .8V P-P on schm. I wicked out the pin to
see if it is "pulling down" the signal. It isn't (no change). The crystal
CR2201 is oscillating at 3.580.245 (around), not 3.579.454 using a
network TV signal into tuner.

The schematic, Profax 3202 from a service magazine, does NOT show
the source for the chroma signal to pin 45 of ICX2200.

 

[David]

I've seen the jungle ic bad AND the 9v regulator bad. If the 9v is not at
the correct voltage and clean, the jungle ic cannot operate properly.
David

"RonKZ650" <ronkz650@aol.comnospam> wrote in message
news:20040522123654.23031.00001220@mb-m25.aol.com...

The video and color signal come off pin 41, then split off into separate
video
and color amps. The color from pin 41 goes to R2260, Q2208, R2261, C2236,
C2235
then to pin 45 in that order. You either have a bad chip or one of these
components is bad. I've seen these suface mount caps and resistors open.
Very
rare though.
Ron

Hi,
Update, More Information (9-2064, not 2065) Sams 4265:

I found a schm. for a different model Zenth that has the TA1268N
(56 pin) IF/Video Processor IC. The P-P chroma signal input on
pin 45 is well below the .8V P-P on schm. I wicked out the pin to
see if it is "pulling down" the signal. It isn't (no change). The
crystal
CR2201 is oscillating at 3.580.245 (around), not 3.579.454 using a
network TV signal into tuner.

The schematic, Profax 3202 from a service magazine, does NOT show
the source for the chroma signal to pin 45 of ICX2200.