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Old 28th November 2008, 12:33 PM   #1
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Default DVD oscillator problem

I try to replace the oscillator inside DVD player. The oscillator is 27Mhz square, 4pad type. I replace it with CTS357, also 27Mhz.
Both are 3V3 supply.

With CTS oscillator, the DVD output picture in the TV has no color, only black and white.

When I put back the original oscillator, the color is back, normal.

I repeat this with another new CTS oscillator then the original oscillator, same result.

I measure the output frequency with frequency counter, the original oscillator is 26.999Mhz while the CTS one is 27.004Mhz.

Is this small difference cause the problem, or there is something else?
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Old 28th November 2008, 07:47 PM   #2
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use search engine, type oscillators and either Jocko Homo or Elso Kwak and you'll find the answer to your problem

Boky
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Old 28th November 2008, 08:23 PM   #3
gmarsh is offline gmarsh  Canada
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The 27MHz oscillator in your DVD player is a straight up crystal oscillator. The CTS357 is a VCXO.

Since the DVD player isn't driving the VCXO control voltage input, the video frequencies generated by your DVD player are hundreds of ppm off frequency. Your television set can't lock onto the offset color carrier, so it's displaying black and white.

No need to bother Elso or Jocko.
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Old 28th November 2008, 09:51 PM   #4
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Quote:
Originally posted by gmarsh

No need to bother Elso or Jocko.
and i suggested this where exactly?

Amasing how people change thing around to feed their egos...
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Old 29th November 2008, 04:18 AM   #5
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Thanks

Because I've already got these CTS357 VCXO in my hand, is there any way I can still use them for my modification purpose?

Right now, I put it pin to pin of the original oscillator. Pin 1 and 6 of CTS is connected to VCC, pin 2 and 5=NC, pin 3=GND, and pin4=Output.

What should be connected to pin1 of CTS357 (Control Voltage) so I can make an equivalent of plain crystal oscillator with this VCXO?
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Old 29th November 2008, 02:35 PM   #6
gmarsh is offline gmarsh  Canada
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Quote:
Originally posted by lumanauw
Thanks

Because I've already got these CTS357 VCXO in my hand, is there any way I can still use them for my modification purpose?

Right now, I put it pin to pin of the original oscillator. Pin 1 and 6 of CTS is connected to VCC, pin 2 and 5=NC, pin 3=GND, and pin4=Output.

What should be connected to pin1 of CTS357 (Control Voltage) so I can make an equivalent of plain crystal oscillator with this VCXO?
If pin 1 of the existing XO is grounded or connected to Vcc, cut the trace to it. Install the VCXO. Then get a 10K trimpot (something like a Bourns 3339), connect the two ends to power and ground and connect the wiper to pin 1. Try to set it to the middle of the trim range where you get color. I'd also connect a 0.01uf ceramic from pin 1 to ground.

Is there any particular reason you're changing this oscillator?

I seriously doubt any audio bits in the DVD player run directly off this oscillator, there's probably a PLL chip somewhere which takes 27MHz and makes 22.5792 or 24.576 out of it. So if you upgrade the 27MHz oscillator, the PLL phase noise will swamp any phase noise improvement that comes from replacing the 27M part.
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Old 29th November 2008, 04:01 PM   #7
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There are only 2 crystal/oscillator inside this unit. They are 5Mhz and 27Mhz. The 5Mhz crystal is connected to CPU, the 27Mhz is in the laser pickup.

My first intention is to try better spec clock, I don't know I encounter this problem.

27Mhz oscillator is connected to pin #165 of 256pin SMD IC (MN35206UB)
Attached Images
File Type: gif 27mhz.gif (32.0 KB, 179 views)
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Old 1st December 2008, 06:25 PM   #8
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Quote:
Originally posted by lumanauw
There are only 2 crystal/oscillator inside this unit. They are 5Mhz and 27Mhz. The 5Mhz crystal is connected to CPU, the 27Mhz is in the laser pickup.

My first intention is to try better spec clock, I don't know I encounter this problem.

27Mhz oscillator is connected to pin #165 of 256pin SMD IC (MN35206UB)

Yeah, just try KWAK-CLOCK with 27MHz FUNDAMENTAL MODE crystal.
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Old 1st December 2008, 08:05 PM   #9
dimitri is offline dimitri  United States
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This is for you, QSerraTico_Tico:

http://www.last.fm/music/Boozoo+Bajo...ht+Over+Manaus
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Old 1st December 2008, 11:14 PM   #10
zinsula is offline zinsula  Switzerland
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Quote:
Originally posted by dimitri
This is for you, QSerraTico_Tico:

http://www.last.fm/music/Boozoo+Bajo...ht+Over+Manaus
Quarck in Manaus!
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