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JohnHWman
Joined: 15 May 2007
Posts: 215
Location: France - Grenoble
TV/Projector: Sony VPH-G90U (one unit for me, four others units repaired and sold)
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| Posted: Fri Feb 06, 2009 8:50 am Post subject: |
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| macgyver655 wrote: | | Whats even more discouraging is the service bulletin on the YA board indicating that a new YA board from Sony does not have these chips on it. What I take on that is Sony ran out of those chips before their replacement YA boards were assembled. So why didn't Sony just have more chips made? They know who their supplier is. |
Exactly Ron, that's not giving me a good feeling about the chip availability  If Sony can't get their own designed chips, there is probably no way we can find some ourselves 
To all : the datasheet posted is lacking of the most important information regarding its internal functions and registers I/O mapping and purpose. Without a function block diagram and internal registers explanation, we can't progress on designing a replacement part  Ending doing a reverse engineering job of such device is a very long and hard task and would require a lot of patience 
I'll try to forward this IC product specification to my japanese friend to let him pass it to his Sony EE friend and hope he may be able to have further documents upon this chip 
[EDIT]Asked on 7th of february, waiting for his response...
John
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My dedicated HT room !
Last edited by JohnHWman on Mon Feb 09, 2009 4:03 pm; edited 1 time in total
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Feb 06, 2009 10:35 am Post subject: |
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| macgyver655 wrote: | | The problem is finding the people who have clue. Thats the hard part. I have found that these chips were made at assy plant E. Problem is no one knows where the f*ck E is......... |
That designator often indicates not the specific plant, but just the country the chip was manufactured.
E would be Spain.
If LSI Logic were involved that wouldn't rule them out, as they seem to have a development facility in spain:
http://www.lsi.com/worldwide/lsi_emea/spain/index.html
Kai
@macgyver655, I sent you a PM with a contact at LSI Logic
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Feb 06, 2009 10:37 am Post subject: |
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| stefuel wrote: |
How many G-90's were produced??? |
just over 1,000 total
Kai
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Feb 06, 2009 10:41 am Post subject: |
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| Mr. Green wrote: |
3). Probably the least favorite idea yet, but could a chip maker be found that could take the info you have plus a few chips and replicate the chip? If you wanted a batch of say 1,000 (depending on what the minimum run would be). It might be worth looking into. Of course, who'd give up a chip for study...?
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With just 1,000 G90s total out there, the max number of chips you could probably ever sell would most likely be 200-250 if there were an insanely high failure rate.
A more likely number would be max 40-80 chips, since they will not be cheap, and the G90 value has dropped significantly over the past couple of years.
Kai
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Feb 06, 2009 11:28 am Post subject: |
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Some more info about the functions of the CXD305-127R Registration DAC Controller can be found in the Theory of Operation document
Kai
| Description: |
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Download |
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CXD-305-127R Registration DAC Control info - G90 Theory of Operation.pdf |
| Filesize: |
49.6 KB |
| Downloaded: |
599 Time(s) |
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JohnHWman
Joined: 15 May 2007
Posts: 215
Location: France - Grenoble
TV/Projector: Sony VPH-G90U (one unit for me, four others units repaired and sold)
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| Posted: Fri Feb 06, 2009 12:42 pm Post subject: |
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Thanks to post this Kai,
I was thinking of doing the same... you were faster
This registration DAC infos are short but enough to say that the CXD305-127R job is mainly to store registration for 3 groups (18 DACs) data from main CPU inside its own memory and wait for next Vertical Drive event to start sending these data to the three relevant DAC groups using a serial synchronous protocol (expanded with 'LD' pulse generation).
Based on my own skills in digital electronic, this kind of job is not really complex to implement inside a CPLD :
- Serial synchronous protocol is commonly used everywhere and not complex to build with gates and flip-flops,
- Serial synchronous link clock speed is 5MHz and 20MHz is provided at chip input (this is quite low speed),
- Temp data Memory is only 18DACs x 12 bits so 216 bits (low size memory),
- All chip access (data + commands) are made using internal register mapped inside main YA Address Data buses.
The main issue (from my point of view) is to implement the chip registers mapping:
- discover these registers purpose,
- find how these registers are mapped inside I/O memory,
- find how the 216 bits of data are inputed inside the 216 bits chip's memory.
That's where the CXD305-127R software programmation handbook is very important to save time in building a new IC !
John
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My dedicated HT room !
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 06, 2009 2:04 pm Post subject: |
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Or better yet, attempt to dump the memory of a valid chip...... 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 06, 2009 2:06 pm Post subject: |
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Kai......some interesting stuff on the manufacturer. I said somewhere in the first 2 pages I thought the chip was made in Spain based on different evidence. How do or did you find out that E was Spain? 
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wallace123456
Joined: 14 Aug 2006
Posts: 2236
Location: Northwest VA area
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| Posted: Fri Feb 06, 2009 2:09 pm Post subject: |
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I sent an email back to Sony asking where the chips were made.
wallace
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 06, 2009 2:39 pm Post subject: |
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My thoughts on the chips programming are.......after the chip is enabled (pin 51) it can be read at pin 52. There are 2 pins for writing to the chip (pins 53 and 54). Now this is where the data sheet would be handy. To find out what data is written though which pin. One guess would be 1 pin is for embedded logic (pin assignment and basic function) and the other for the temporary data to control the DAC's. Anyone else for some guessing..... 
As John said, the chips function is not real elaborate. But how it preforms those functions has to be exact.
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JohnHWman
Joined: 15 May 2007
Posts: 215
Location: France - Grenoble
TV/Projector: Sony VPH-G90U (one unit for me, four others units repaired and sold)
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| Posted: Fri Feb 06, 2009 2:49 pm Post subject: |
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| macgyver655 wrote: | | My thoughts on the chips programming are.......after the chip is enabled (pin 51) it can be read at pin 52. There are 2 pins for writing to the chip (pins 53 and 54). Now this is where the data sheet would be handy. |
Yes, maybe a simple new programming operation of a defective chip can solve the issue, why not
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My dedicated HT room !
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Fri Feb 06, 2009 4:28 pm Post subject: operational g90s |
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what mods could be done to prevent chip failure (fan on the chip?) of the pj owners with operational g90s>?
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The more I learn
the less I know.
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Feb 06, 2009 4:40 pm Post subject: |
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| macgyver655 wrote: | | Kai......some interesting stuff on the manufacturer. I said somewhere in the first 2 pages I thought the chip was made in Spain based on different evidence. How do or did you find out that E was Spain? |
It was in some document I saw that explained the scheme of that last block.
It's not 100 percent certain though, since Sony may not use that scheme.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Feb 06, 2009 4:42 pm Post subject: |
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E = Espagnol.
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Feb 06, 2009 4:43 pm Post subject: |
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| JohnHWman wrote: |
- find how the 216 bits of data are inputed inside the 216 bits chip's memory.
John |
John, the Theory of Operation doc mentions 151bite, which I assume is 151 byte. I have no idea what they mean though
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tommo2
Joined: 03 Jun 2006
Posts: 226
Location: Ireland
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| Posted: Fri Feb 06, 2009 4:49 pm Post subject: Re: operational g90s |
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| incova wrote: | | what mods could be done to prevent chip failure (fan on the chip?) of the pj owners with operational g90s>? |
Buy a Barco, maybe...?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Feb 06, 2009 5:16 pm Post subject: |
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Just got an email, I can apparently get these:
CXD3058AR
Let me know if those are compatible...
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Feb 06, 2009 6:10 pm Post subject: |
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| Curt Palme wrote: | Just got an email, I can apparently get these:
CXD3058AR
Let me know if those are compatible... |
Did you get a datasheet with that email?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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richardc
Joined: 13 Feb 2008
Posts: 32
Location: Australia
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| Posted: Sat Feb 07, 2009 2:37 am Post subject: |
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Curt
The 101R is a 64 pin chip
the 127R is an 80 pin chip
At first glance.
Richard
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