CurtPalme.com Home Theater Forum

HaydnG90 · Joined: 22 May 2006 Posts: 1356

Chuchuf · Joined: 11 Mar 2006 Posts: 548

Chuchuf · Joined: 11 Mar 2006 Posts: 548

Chuchuf · Joined: 11 Mar 2006 Posts: 548

JohnHWman · Posted: Tue Feb 17, 2009 8:31 am Post subject:

Terry, Ron, Curt,

- I do have Oliverg's YA board that is probably defective on IC421,
- I just received two parts of CXD2309Q from an Ebay seller in Malaysia but I don't think this part failed on oliverg's board (as G2 is stable, image is only shaking). I bought them because there were cheap and just in case...
- I do have a G90 test chassis with burned tubes available with a working YA board. The problem is that this unit is already sold to a customer and I'm currently retubing the unit with Barco 9" bare tubes (Thanks Terry),
- I do have all the tools to R&R IC421 chip on Oliverg's board (Metcal MX-500P solder station with proper size TQFP dessoldering tool). I also have a very good japanese binoccular magnifier to let me resolder the chip on the board.

I really don't wanna take the risk of removing the working IC421 part from the Test chassis unit and mount it on Oliverg's YA board to confirm that this completely solve the issue. This is too risky about the working YA board I've got and which is from a G90 unit that is already sold and paid Shocked

Curt or Terry : if you have another defective YA board known to have a working IC421, maybe you can send me this card so I can recover the chip and mount it on Oliverg's board to try. The only issue is that I'm located in France and maybe Ron is closer to you to make this chip replacement and let you test on one of your test units. On the other hand, If I do it, this leaves you time to investigate Haydn YA board failure in the same time Wink

John

RogueChili · Joined: 31 Mar 2008 Posts: 162 Location: Westfield, MA

John, the theory of operations shows the output signal sequence and timing for the controller chip and the best I can tell there are test points on the YA board allowing access to these signals. Verifying if the chip is functional properly should be straight forward! Am I missing something here?

JohnHWman · Posted: Tue Feb 17, 2009 2:44 pm Post subject:

Yes RoqueChili,

I've used these tests points two years ago when I discovered that IC421 had failed on curt's YA board : http://www.avsforum.com/avs-vb/showthread.php?p=9824398#post9824398
Checking IC421 'CE' signal and output communication clock out of the chip (using test points) can easely tells if IC421 is defective... Since I've build YA board extenders, it's now very easy to check.

John

Chuchuf · Joined: 11 Mar 2006 Posts: 548

John,

Sent you an email. Let me know if you get it.

Terry

JohnHWman · Posted: Wed Feb 18, 2009 6:40 pm Post subject:

I've got it Terry
John

CIR Engineering · Posted: Fri Feb 20, 2009 1:22 am Post subject:

I just saw this thread for the first time.

Just to let everyone know, I have a fully functional G90 test unit here with burnt tubes that I plan to hold onto for a while... It's open for testing.

craigr

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

CIR Engineering · Posted: Fri Feb 20, 2009 2:25 pm Post subject:

I also have an SMD rework station here and am pretty comfortable with working on high dollar stuff. However, pulling the chip off a working YA may be more risk than I am willing to assume on my own... due to the possibility of a pretty bad financial loss.

craigr

JohnHWman · Posted: Tue Feb 24, 2009 8:38 am Post subject: Some more bad news ...

Here is the reply from my japanese friend upon CXD305-127R internal structure informations :

Hi John,

In recent couple of weeks Ixxx-san and Axxxxx-san(Sony Co.) worked hard to get answer for you and G90 user request.
However so far they realized that Sony or Sony related company never provide internal design information and software etc. to anyone including Ixxxx-san too.

So it will be mostly impossible to get the same.

The only thing I've got from Ixxxx-san is to deliver New YA board with CXD305-127R chips from distributor in Japan.
There are few boards available and Ixxxx-san can deliver it to anywhere.
The cost is not cheap , something like $2500 or more.

please let me know your thought.

thanks,
h.

Evil or Very Mad

At least, there is some 'like-new' YA boards available in Japan Wink

Bad new is the price of these Shocked

Let me know if someone want to go that route despite the price, I'll ask.

I'm affraid that we should do Reverse Engineering job on this chip sooner or later Confused

John

Tom.W · Joined: 09 Mar 2006 Posts: 6635

John that REALLY sucks !

From now on no more Sony products for me.

Let them design their way out of existence... Rolling Eyes

stefuel · Posted: Tue Feb 24, 2009 10:40 am Post subject:

Non of this does me any good. It won't sway Pete from dumping on AmPros. The good news is there will be a flurry of great tubes and lenses available for you hardcore Marquee guys to play with. Wink

mp20748 · Posted: Tue Feb 24, 2009 11:21 am Post subject: Re: Some more bad news ...

CIR Engineering · Posted: Tue Feb 24, 2009 1:18 pm Post subject:

Even though I already knew all that Mike, reading it again in your post has moved me into your direction. Maybe we should start looking at all the 80 pin DAC controllers and their pin-outs to try and see if we can find something similar.

If someone sends me a broken YA I could put a socket on the board and we could test lots of DAC controllers in a working G90 that way.

craigr

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Thats a good idea Craig, or if the pin outs are different a simple daughter board could be made for that chip or even one with jumpers for different types of chips . That be a pain swapping little jumper cables but what other option is there?

Athanasios

JohnHWman · Posted: Tue Feb 24, 2009 1:45 pm Post subject: Re: Some more bad news ...

JohnHWman · Posted: Tue Mar 31, 2009 8:00 pm Post subject:

Okay Gents,

Here is an update and a confirmation of the source of the "image shaking" problem !

My test was made on Oliverg's original YA board that he sent me almost 10 months ago for servicing his "image shaking problem" on his G90 unit.
First I've re-checked about Oliverg's YA board behaviour on my test chassis unit : image was shaking as hell...

I've then spent a couple of hours to carefully remove the suspected 'defective' IC421 (CXD305-127R) chip, clean the footprint pads on the PCB and replace it with a known 'working' CXD305-127R chip (taken from a working YA board).

I've resolder all the chip's pins pin by pin under my binocular magnifier and checked that I've made no shorts between pins (this IC is rare and costly !).

Once everything was visually checked OK, I've re-installed the YA board within my test unit and fire-it up : Image is now really stable and all parameters (contrast, brightness, convergences, ...) are well updated through the remote Exclamation

Conclusion : The image shaking problem comes ONLY from this CXD305-127R chip failure... This confirm my own finding when I've sent the YA board of my second G90 unit two years ago to Sony at San Jose (for the same 'image shaking' issue) and where I found that they replaced IC421 when the board came back to me (after spending $1650 Sad

for the service to Sony Twisted Evil

).

Now Oliverg's YA board is fully OK Wink

John