Oppo Blu-Ray BDP-83 - has anybody fitted new clocks? - diyAudio
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Old 18th December 2009, 08:17 AM   #1
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Default Oppo Blu-Ray BDP-83 - has anybody fitted new clocks?

Just curious. The Oppo BDP-83 has now been out for about six months and the online mod businesses are already doing their thing(s). The 27MHz clock is the first item that is obvious to upgrade. Has any of you DIY'ers done this for themselves yet and what has been your experience in A) ease of fitting new clock and possible complications, and B) what did you observe as far as performance.

Over to you guys.

Joe R.
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Old 19th December 2009, 03:13 AM   #2
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Just to add to above. Have anybody installed a Burson clock into the Oppo Blu-Ray? I believe they, Burson, recommend that two resistors forming a dividing network is required after the oscillator (3.3V) stepping down to 1.8V or lower (I have a Philips BDP service manual that says core voltage is 1.1V for MT8520 which I gather is basically the same chip used by Oppo).

Does anybody know what those resistor values are or have come up with other values and used successfully as well? This of course applies to clocks other than Burson's.

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Old 19th December 2009, 05:43 AM   #3
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Quote:
Originally Posted by Joe Rasmussen View Post
doing their thing(s). The 27MHz clock is the first item that is obvious to upgrade. Has any of you DIY'ers done this for themselves yet and what has been your experience in A) ease of fitting new clock and possible complications, and B) what did you observe as far as performance.

Over to you guys.

Joe R.
carefully remove the 27m crystal , C194, C197 and R84.
the new clock signal i/p is the solder pad of the crystal that is closer to the mt8521 chip
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Old 19th December 2009, 07:05 AM   #4
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Quote:
Originally Posted by arthur View Post
carefully remove the 27m crystal , C194, C197 and R84.
the new clock signal i/p is the solder pad of the crystal that is closer to the mt8521 chip
Thanks for the reply. But have you then run the Blu-ray sampler disk via HDMI out? You will see that the picture is continuously chopping, like flick... flick... flick... etc.

Right now I am running two BDP-83 players here in the following way. The output of the oscillator sees a voltage divider network made up of 100R and 50R. Note that attenuates then clock signal by 3:1 - I don't remove R84, it's still there.

Note that this means I am running 1.1V logic and that the MT chip is likewise, nowhere near 3.3V. The players work just fine.

This is why I started this thread. I believe that Burson Audio's clock is installed the same way via a voltage divider after the clock. I don't have proof but if I am right then what value resistors are they using and are the also attenuating 3:1 as I am?

Hope there is somebody who can enlighten on this topic.

But thanks form your input. Maybe you should try what I have done. How is your HDMI output with full 1080p?

Cheers.

Joe R.
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Old 19th December 2009, 12:24 PM   #5
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i use a 5v tcxo, then 2 logic gates(5 v ), nothing abnormal found.
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Old 19th December 2009, 12:41 PM   #6
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Quote:
Originally Posted by arthur View Post
i use a 5v tcxo, then 2 logic gates(5 v ), nothing abnormal found.
That certainly surprises me, you are feeding 5V to the TCXO or 3.3V?

Is there any domumentation that you have seen, especially on MT8520/MT8521 (Oppo uses OP8521G I believe) and what made you decide to use the Xtal pad closest to the chip as the XT_IN. I saw somebody posting a pic that shows he was using the pad furthest away. Are we just guessing or is there any actual docs that makes it certain?

Cheers.

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Old 19th December 2009, 01:13 PM   #7
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1) 5v work ok(2 stages 74vhc 04)
2)i use the solder pad of the crystal that is near the heatsink
the other solder pad i try does not function at all
3) i have modified 5 bdp83 already

Last edited by arthur; 19th December 2009 at 01:16 PM.
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Old 19th December 2009, 02:02 PM   #8
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Thanks Athur, much appreciated.

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Old 19th December 2009, 02:16 PM   #9
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Oh, BTW, did you find that you absolutely had to remove R84? I would have thought it still would be a godd idea to leave it in? Did it not work properly unless you removed R84?

Cheers.

Joe R.
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Old 19th December 2009, 02:38 PM   #10
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sorry i have not tried
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