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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Wed May 14, 2008 2:38 am Post subject: G90 YA board failure or another Dallas chip problem |
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Turned on the pj this evening and appear to have lost all the convergence and magnetic settings (I saved these about 2 months ago to the service block so hopefully they are safe somewhere in the pj).
Pj powers up normally but when I went to the back of the unit to check the error codes, if any, I don't see any numbers illuminated in the display. Has the YA board gone belly up or do I have a failed or failing Dallas chip. I was planning to send the old one off to be copied onto its replacement, but the fact that I don't see anything in the display is making me think there is something else wrong. Any suggestions? Cheers.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed May 14, 2008 5:04 am Post subject: |
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If you dont have any display on the 7 segment readout it could be a problem on the YA board driver section, a problem with the segment board or you may be missing the sub +5v at pin 1 on the segment board. Since you also have a convergence problem I would suspect the sub +5v issue.
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Chuchuf
Joined: 11 Mar 2006
Posts: 548
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| Posted: Wed May 14, 2008 3:43 pm Post subject: |
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Sounds to me if I am reading this correctly as if your Dallas chip has given up and you have lost all "user" settings.
macgyver, the display only shows codes on startup and then nothing after that if the unit is working properly. So the question to Hayden is do you see the normal startup codes when you first start up the PJ?? or is the readout blank.
If normal, dallas chip.
Terry
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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: Wed May 14, 2008 3:45 pm Post subject: |
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Hello Haydn,
Mmmmh...... Could be the Dallas chips that losted his content. If the unit is operating normally (menu display, settings, ...) then this could be the Dallas that gets damaged on one of its memory contents. I would suggest to remove the main from the unit, remove the YA board, replace the Dallas IC, format it using relevant section in the SM and recover your settings from the service block flash memory. The only issue is that you'll loose your timers and unit serial number records within the Dallas chip...
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: Wed May 14, 2008 3:48 pm Post subject: |
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| Chuchuf wrote: | Sounds to me if I am reading this correctly as if your Dallas chip has given up and you have lost all "user" settings.
macgyver, the display only shows codes on startup and then nothing after that if the unit is working properly. So the question to Hayden is do you see the normal startup codes when you first start up the PJ?? or is the readout blank.
If normal, dallas chip.
Terry |
Hi Terry. I agree, but what made me think it might be a power problem is if its was the dallas failure he should have an error code. Then if it is a power issue to the display and the dallas is not getting it's required 5v to come out of write protect then the dallas will not give out any info or dump it into its ram. It would still be in battery lockdown.
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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: Wed May 14, 2008 4:37 pm Post subject: |
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A missing "sub +5v" power would let the unit impossible to be turned on since this power is used in Standby mode to wake-up the PJ throught the remote commander.
John
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Home theater enthusiast for over 20 years !
My dedicated HT room !
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Wed May 14, 2008 4:50 pm Post subject: |
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Hi Guys,
When I power up I see what I think is a normal series of codes in the display. red 88 followed by orange 88, then blank. No other codes as reported by Frank such as 11. I'm hoping he'll be able to copy the contents of the chip onto the new Dallas IC. If not then I should be able to transfer the calibration file I saved into the service block 2 months ago (glad I did that at least). I think I can live with the lost serial number and timer info. Just don't want to lose the calibration stuff.
If it is the Dallas chip losing power than mine lasted less than 8 years. Build date on my G90 is Aug 2000 with serial number in the late 500's.
What are the chances the data on the chip is readable. Is there a power threshold that the chip has dipped below that causes a read failure on the pj. Could there still be enough residual power would be sufficient to maintain the integrity of the stored settings?
Haydn
Last edited by HaydnG90 on Wed May 14, 2008 5:37 pm; edited 1 time in total
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed May 14, 2008 5:02 pm Post subject: |
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| JohnHWman wrote: | A missing "sub +5v" power would let the unit impossible to be turned on since this power is used in Standby mode to wake-up the PJ throught the remote commander.
John |
Hi John. As I'm sure you'll agree there are (4) sub+5v's derived on the YA board from the sub +6v supply. The cpu and other sections come from sub +5v (main) and the Dallas is sub +5v (reg 1). 2 different 5 volt regulators. However it now appears that his display is working so I agree it is probably the Dallas.
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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: Thu May 15, 2008 7:30 am Post subject: |
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| HaydnG90 wrote: | | What are the chances the data on the chip is readable. Is there a power threshold that the chip has dipped below that causes a read failure on the pj. Could there still be enough residual power would be sufficient to maintain the integrity of the stored settings? |
You can try to read its content using a standalone or PC based programmer device. Once done, you can send me the file (128KB) through e-mail and I should be able to let you know if some datas can be retreived or not. John
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My dedicated HT room !
Last edited by JohnHWman on Fri May 16, 2008 7:10 am; edited 1 time in total
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Thu May 15, 2008 6:20 pm Post subject: |
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Another interesting observation. If the timer info and serial number are stored on the Dallas chip, why am I still able to see that information in the service menu? I'm hoping this is a good sign and that there's a good chance to copy the contents of the chip to the new one.
I removed the chip from the YA board which was very easy to do, being careful not to zap it with static. I used an anti-static mat and wristband, loosened each end of the chip carefully to avoid bending the pins, got it halfway out and then pulled it the rest of the way. Its now on its way for copying.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu May 15, 2008 8:45 pm Post subject: |
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| HaydnG90 wrote: | Another interesting observation. If the timer info and serial number are stored on the Dallas chip, why am I still able to see that information in the service menu? I'm hoping this is a good sign and that there's a good chance to copy the contents of the chip to the new one.
I removed the chip from the YA board which was very easy to do, being careful not to zap it with static. I used an anti-static mat and wristband, loosened each end of the chip carefully to avoid bending the pins, got it halfway out and then pulled it the rest of the way. Its now on its way for copying. |
I'm curious if when you shut it off the night before did you turn off the main power switch on the projector also or just shut it off with the remote?
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Thu May 15, 2008 9:27 pm Post subject: |
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| macgyver655 wrote: | | HaydnG90 wrote: | Another interesting observation. If the timer info and serial number are stored on the Dallas chip, why am I still able to see that information in the service menu? I'm hoping this is a good sign and that there's a good chance to copy the contents of the chip to the new one.
I removed the chip from the YA board which was very easy to do, being careful not to zap it with static. I used an anti-static mat and wristband, loosened each end of the chip carefully to avoid bending the pins, got it halfway out and then pulled it the rest of the way. Its now on its way for copying. |
I'm curious if when you shut it off the night before did you turn off the main power switch on the projector also or just shut it off with the remote? |
I almost always use the standby button on the remote. The last time I used the main power switch was about a month ago when we had thunderstorm and I wanted to disconnect the G90 from the mains. I'd used the pj without problems just 2 days earlier.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu May 15, 2008 11:31 pm Post subject: |
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| HaydnG90 wrote: | | macgyver655 wrote: | | HaydnG90 wrote: | Another interesting observation. If the timer info and serial number are stored on the Dallas chip, why am I still able to see that information in the service menu? I'm hoping this is a good sign and that there's a good chance to copy the contents of the chip to the new one.
I removed the chip from the YA board which was very easy to do, being careful not to zap it with static. I used an anti-static mat and wristband, loosened each end of the chip carefully to avoid bending the pins, got it halfway out and then pulled it the rest of the way. Its now on its way for copying. |
I'm curious if when you shut it off the night before did you turn off the main power switch on the projector also or just shut it off with the remote? |
I almost always use the standby button on the remote. The last time I used the main power switch was about a month ago when we had thunderstorm and I wanted to disconnect the G90 from the mains. I'd used the pj without problems just 2 days earlier. |
Hmmmm.. If you didn't shut off the main then the Dallas should of still been receiving power and not in battery mode. Well I guess we'll seen what happens when you get your new Dallas back. Hopefully it will be ok. 
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Thu May 22, 2008 3:04 pm Post subject: Update |
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Was told the old chip was copied without problems. Now the $64,000 question is whether or not the data was corrupted and junk was copied over. I won't know the answer to that until I put the board, with the new Dallas chip, back in the G90. The suspense is killing me...... 
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Tom.W
Joined: 09 Mar 2006
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Wed Jun 04, 2008 1:12 am Post subject: Update |
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Just put the new Dallas chip in the projector. Restarted and the calibration settings are as they were with the old chip. Interestingly the timer and serial number are still reading correctly. OK so I'm thinking the data had become corrupted on the old chip and I'm just seeing this on the new chip. Tried copying the data I had stored to the service block several months ago to the chip in the hope I could retrieve my calibration settings. I used the "all data reset" from the service block as described in the manual on p139. Still no joy. I tried repeating the steps and the pj shutdown with error 89 (orange)-EBH board error. I restarted the pj without problem and went through the reset procedure again. No problems this time. Its now 30 mins later and the pj is still running.
So the problems I'm experiencing don't appear to be related to a Dallas chip failure. Any suggestions?
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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: Thu Jun 05, 2008 7:13 am Post subject: |
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Hello Haydn,
So, this looks like a YA board problem with the I²C serial links that drives the digital potentiometers (DAC) locted on BA/DD/DE/DF boards. Randoms errors like '89' are due to such bad I²C lines datas sended to DACs ...
I had the same kind of issue with Curt's G90 I bought two years ago and this was due to a IC421 failure (CXD305-127R). Since this part is only sold by Sony, I must sent the board to San Jose for servicing and this costed me $1600  .
Full story here : http://www.avsforum.com/avs-vb/showthread.php?t=735051
Try to exchange the YA board with another one (if possible) to determin that its definitely a YA board issue.
That's not the first time I see such IC421 failure on the G90 : with oliverg's YA board failure (he sent me his customer YA board for investigation) (http://www.avsforum.com/avs-vb/showthread.php?t=1031447): there is now three YA boards that failed with IC421 ...
Later
John
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Home theater enthusiast for over 20 years !
My dedicated HT room !
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