CurtPalme.com Home Theater Forum

[AnalogRocks]

[AnalogRocks]

[WTS]

In the meantime for those who still have working G90s I would think it would be prudent to find out what causes these ICs to fail and make the required mods to ensure there isn't anymore G90s going to the bone pile.

[JohnHWman]

Following Ron's post, to add informations about these SONY specific ICs, here is some more information :

First chip the CXD2309Q :

This chip is a triple 10 bits Digital to Analog Converter. On the G90, this one is used to generate the RGB tube G2 control (D/AR, D/AG, D/AB seeen on below schematic) for ABG operation. Here is its Block Diagram :

It seem's that this chip can still been found as spare today. Ron's found them on the Bay for $18. I've ordered some to be safe. FYI, I've also asked the seller about CXD305-127R availability, we never know

Second chip the CXD305-127R :

As pointed by Ron, this chip is *NOT* a DAC but only a DAC controler which is able to broadcast digital informations through three I²C standard like serial link buses.

The chip is mapped inside peripheral memory and use Address (A0-A7) and Data (D0-D15) microcontrolers buses that is common to all YA's CPUs (EXT BUS). This chip is selected to the correct address segment through its CE pin. It provides three serial communication links and some control lines :
- DCLK for all buses I²C common clock line
- DLD(0-3) for three "Load Data" lines
- DDATA(0-2) for three I²C like data lines
- PB(0-4) for 5 DACs ICs banks access
- D-RESET for DACs ICs reset

In fact, almost all the G90 adjustments analog voltages are generated from DACs located on DE board. And all these DACs are driven by this single CXD305-127R that is responsible of the broadcast of 'almost' all the parameters used to set the G90 operations. That is why a failure of this single chip is a real disaster for the owner as it makes the unit completely unusable

This chip is only 100% digital and was probably made using a generic CPLD core as this CXD305 ref is used with several different suffix :
CXD305-101R CMOS signal processor http://datasheet.digchip.com/000/000-1-CXD305-101R.pdf
CXD305-110Q
CXD305-114Q
CXD305-116Q
CXD305-122Q
CXD305-127R
Personnaly, I don't think that this chip have a firmware but maybe this CPLD was fused programmed during manufacturing process (ROM) using a specific 'program' that internaly hardwired all the necessary logic functions inside the CPLD. Maybe the reason of this chip failure is due to its 'programmability' ; some fuse may have changed their state while the chip gets old ??

If we want to have more information, we need to find is datasheet document (maybe from Sony design team members ? I'll try this with one the Japan G90 engineer man I know, not worth to ask !)

Here is the complete schematic of these two chips inside the YA board :


John

[macgyver655]

Glad you posted that stuff John. Thats the info I've been hammering over. The firmware comment I made was referring to the fused programmable section of a chip. Its my understanding that if the fuses are blown after programming the the data cannot be read. I'm not sure I understand when you say the fuse changes its state.

One reason I'm not sure its even a programmed device is because data is written and read from the chip during its operation. If it is a programmable device then this data would have to be written to a different section of the chip.

I am actually working on a data sheet right now with Sony professional, just waiting on a phone call. Fingers crossed. I did find out that the official end of production of the G90 was 2003.....

[JohnHWman]

[macgyver655]

Sill waiting but I have acquired some more info. On the bottom of the chip, the cxd305 one you see the numbers 003A01E. I have the code for this.......the first 0 is the year the chip was made so its 2000. next 2 numbers are the week....03 or 3rd week. A01 is the serial code and the E is the assembly location. This would be the important one if I can find out where E is....

[stefuel]

Perhaps this will help

[Xeus]

I found some information for a totally unrelated part but the document describes the function of a DAC controller.

http://www2.altium.com/files/learningguides/CR0120%20MAX1104%20DAC%20Controller.pdf

Matt

[winduptoy]

I wonder what the folks at FH Video think of all this? Aren't they still sitting on a boatload of CRT inventory?

[HaydnG90]

I spoke to someone at FH and they said they have A-stock G90's for @$20K with 1yr FH warranty not Sony. When I asked about what would happen in the eventuality that the YA board couldn't be repaired he said they would take it back and refund the amount paid. Point is you're SOL when the warranty expires after 12 months.

[macgyver655]

[stefuel]

Just so everyone understands, even if a datasheet is found doesn't mean we have a solution. If it is a programmed at manufacture device and the data is secured then finding another similar device without the programming info will do no good. But this is why we need a datasheet. To see just what the function and ability of the chip is. Then we can proceed from there.

Evidently you didn't see my post. I gave you the data sheet.

[macgyver655]

[RogueChili]

the diagram above shows IC421 connection to "DAC". Is there a diagram showing the other IC the connections to "DAC" ?

[JohnHWman]

"DAC" buse is the set of I²C like connections between the DAC controler and the DE board where most of the DAC chips of the G90 unit are located.

I can post the DE board block diagram to make things clearer if needed.

John

[RogueChili]

Thanks, I am curious to see how the lines are distributed amongst the DAC's.

So, basically we have a multi channel serial port with device select decoding and timing control. It seems a generic PLD can be programed to do that?

[macgyver655]

Hey John. I got an email back from that guy with the CXD2309's. No CXD305's !!!!!!!!

It was worth a shot though. Sometimes these guys from Malaysia have that odd ball stuff.

[macgyver655]

Here's a picture of the DE board. A little blurry though. How do you guys get a good pic to put here from a pdf page? I've been wrestleing with that for some time now.


[/img]

[Nashou66]

On A mac you can select part of the PDF image and select it then save it Jpeg or Tif Gif etc not sure id acrobat can do the same as Preview on the Mac.

Athanasios

[kschmit2]