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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Apr 28, 2009 11:23 am Post subject: |
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Did you do that removal and install by hand? Great work with such small connections.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Tue Apr 28, 2009 3:04 pm Post subject: |
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| km987654 wrote: | | Did you do that removal and install by hand? Great work with such small connections. |
Yes I did it by hand. I do have the correct tools for such a task which helps 
Normally this amount of work would have taken me about 30 minutes. But I was supper careful due to the rarity of this particular IC. The extra care added more than four hours because I wanted to use as little heat as possible. I actually reworked the IC421's on both boards first with low temperature alloy. This way when I applied the hot air to lift the IC421, it could be kept short and at a low temperature. The IC421 was barely even warm at the center during the entire process. Trouble is that low temp alloy is a pain to clean up when the IC legs are so close together and fragile... time time and more time!
craigr
_________________
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Phone: 865-405-6892
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Tue Apr 28, 2009 6:23 pm Post subject: |
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| Curt Palme wrote: | | And the chip number of yesterday's 'bad YA board' email is..... |
Yeah, big surprise. 
Craig may have a point. My IC421 came off a G90 with 1300 hrs. I guess if they're able to get past a critical number of hours they should be OK, or at least be a bit more robust. Those high hour beater G90's with fried tubes look even more attractive now, as they've demonstrated longevity.
What was the SN of projector?
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dochlywd
Joined: 25 Apr 2006
Posts: 346
Location: Saint Louis, Missouri
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| Posted: Tue Apr 28, 2009 6:56 pm Post subject: |
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This is interesting as the one that I purchased that was demonstrating the dreaded shut-down problems only displayed 150hrs on it and the tubes were as white as snow. Well, aside from the deflection burn in all three, they really looked like brand new! However, my YA board has been tested by both Curt and Terry now and they both have confirmed that it is functioning correctly. That means that there is a different fault in my projector. Terry had a G90 that displayed almost the exact same symptoms as mine and he found that it was an issue with the PA board. Now that I have the PJ back in my possession, that's something we'll have to look into. I'll check the serial number tonight just to see, though.
Doc
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Wed Apr 29, 2009 9:51 pm Post subject: |
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Sing with me,
I like my AmPro, my AmPro likes me.
You can stick that G-90 in a place you can't see. 
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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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: Tue May 05, 2009 2:18 pm Post subject: |
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| HaydnG90 wrote: | | Curts board sounds like it has the same symptoms/error codes to a board that Terry sent to John. Curt, were you having any problems getting PjUpdate to communicate with YA board? Besides those errors, this was John's finding and that the pj won't come out of standby. |
All,
Here is an update about Terry's YA board which lacked of RS232C communication :
Good new : the board is now fully OK 
Here is the complete operations Ive made on this board :
Replacement of IC921 (with a brand new device),
Replacement of IC941 (with a part taken from the other defective YA board),
Replacement of C946,C945, C944, C941 (0.1΅F ceramic with a parts taken from the other defective YA board),
Checked every tracks impedance from RS232C connector util Main CPU (IC201),
Resolder IC201 pin #37 to pin#72 (tricky job),
Resolder main firmware flash chip pins (IC234)
Mount the board inside my test chassis, power-up : 88/88/10/11
Hook the laptop with the proper RS232C cable to the YA board,
Start PJupdate software, tried to establish connection with the board with no success ( no status, no YA board detected so IC234 content is corrupted),
Switch Pjupdate software in emergency mode,
Switch down the G90 from main, restart it again and wait for 11 displayed on the YB display,
Launched the downloading of the software in emergency mode : display starts to switch between 11 and 12 !
Let the PJupdate download the complete software to the YA board,
At the end, display shows ZF, then 11 then 88/88 then blanck,
Used PJupdate to display the unit status : G90 is detected and reported as in Standby Mode,
Switch on the G90 with remote, units starts fine and I displayed the menu, no problem,
Used PJupdate to display the unit status : G90 is detected and reported as in running Mode,
Switch off the G90 with remote,
Used PJupdate to display the unit status : G90 is detected and reported as in Standby Mode,
Disconnected G90 from main and remove YA board and reinstalled mine.
Another YA board repaired  my fourth one indeed 
John
_________________
Home theater enthusiast for over 20 years !
My dedicated HT room !
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Tue May 05, 2009 2:26 pm Post subject: |
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| JohnHWman wrote: | | HaydnG90 wrote: | | Curts board sounds like it has the same symptoms/error codes to a board that Terry sent to John. Curt, were you having any problems getting PjUpdate to communicate with YA board? Besides those errors, this was John's finding and that the pj won't come out of standby. |
All,
Here is an update about Terry's YA board which lacked of RS232C communication :
Good new : the board is now fully OK
Here is the complete operations Ive made on this board :
Replacement of IC921 (with a brand new device),
Replacement of IC941 (with a part taken from the other defective YA board),
Replacement of C946,C945, C944, C941 (0.1΅F ceramic with a parts taken from the other defective YA board),
Checked every tracks impedance from RS232C connector util Main CPU (IC201),
Resolder IC201 pin #37 to pin#72 (tricky job),
Resolder main firmware flash chip pins (IC234)
Mount the board inside my test chassis, power-up : 88/88/10/11
Hook the laptop with the proper RS232C cable to the YA board,
Start PJupdate software, tried to establish connection with the board with no success ( no status, no YA board detected so IC234 content is corrupted),
Switch Pjupdate software in emergency mode,
Switch down the G90 from main, restart it again and wait for 11 displayed on the YB display,
Launched the downloading of the software in emergency mode : display starts to switch between 11 and 12 !
Let the PJupdate download the complete software to the YA board,
At the end, display shows ZF, then 11 then 88/88 then blanck,
Used PJupdate to display the unit status : G90 is detected and reported as in Standby Mode,
Switch on the G90 with remote, units starts fine and I displayed the menu, no problem,
Used PJupdate to display the unit status : G90 is detected and reported as in running Mode,
Switch off the G90 with remote,
Used PJupdate to display the unit status : G90 is detected and reported as in Standby Mode,
Disconnected G90 from main and remove YA board and reinstalled mine.
Another YA board repaired my fourth one indeed
John |
John that is some mighty fine trouble shooting and repair there my friend  You are good!
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue May 05, 2009 2:59 pm Post subject: |
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Nice job, John. What do you believe the main problem was? I see the first 3 lines of repair pertain to the RS232 communication. Were you testing the board in between repairs? Did you find specific failure readings of these parts? Was the resoldering required or just a preventative measure? You can respond via PM if you dont want to post here. I'm curious on a very detailed process of your findings. Thanks
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Chuchuf
Joined: 11 Mar 2006
Posts: 548
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| Posted: Tue May 05, 2009 3:50 pm Post subject: |
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Very nice work indeed John!!
Macgyver, that boards symptoms were that it would not communicate via RS-232 with PJUpdate but seemed to be requesting updates. It was also not operational.
Terry
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue May 05, 2009 4:02 pm Post subject: |
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| Chuchuf wrote: | Very nice work indeed John!!
Macgyver, that boards symptoms were that it would not communicate via RS-232 with PJUpdate but seemed to be requesting updates. It was also not operational.
Terry |
So that's not the one you had me replace some ic's on?
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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: Tue May 05, 2009 4:21 pm Post subject: |
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| macgyver655 wrote: | | Nice job, John. What do you believe the main problem was? I see the first 3 lines of repair pertain to the RS232 communication. Were you testing the board in between repairs? Did you find specific failure readings of these parts? Was the resoldering required or just a preventative measure? You can respond via PM if you dont want to post here. I'm curious on a very detailed process of your findings. Thanks |
Hi,
- Tried the card back in the unit after replacement of IC921 (with a brand new device) : no joy,
- then I did all the other replacements (IC941, C946,C945, C944, C941) and resoldered IC201 pin #37 to pin#72 together with main firmware flash chip pins (IC234); all together in one step without testing the board bak in the unit.
So I really don't know where was the real failure... I think that maybe IC201 resoldering job ?
_________________
Home theater enthusiast for over 20 years !
My dedicated HT room !
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue May 05, 2009 6:19 pm Post subject: |
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| JohnHWman wrote: | | macgyver655 wrote: | | Nice job, John. What do you believe the main problem was? I see the first 3 lines of repair pertain to the RS232 communication. Were you testing the board in between repairs? Did you find specific failure readings of these parts? Was the resoldering required or just a preventative measure? You can respond via PM if you dont want to post here. I'm curious on a very detailed process of your findings. Thanks |
Hi,
- Tried the card back in the unit after replacement of IC921 (with a brand new device) : no joy,
- then I did all the other replacements (IC941, C946,C945, C944, C941) and resoldered IC201 pin #37 to pin#72 together with main firmware flash chip pins (IC234); all together in one step without testing the board bak in the unit.
So I really don't know where was the real failure... I think that maybe IC201 resoldering job ? |
So you tried emergency mode update before replacing ic921, then again after just replacing ic921 and no go on both occasions? Then after last repair emergency mode did work? 
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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: Tue May 05, 2009 6:40 pm Post subject: |
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Big kudos to John on this. I lack the digital data troubleshooting skills, but am fluent in analog. I should have paid attention in computer class rather than playing Space Invaders.
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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: Tue May 05, 2009 9:14 pm Post subject: |
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| macgyver655 wrote: | | So you tried emergency mode update before replacing ic921, then again after just replacing ic921 and no go on both occasions? |
Yes | Quote: | | Then after last repair emergency mode did work? |
yes, that's right.
| Curt Palme wrote: | | Big kudos to John on this. I lack the digital data troubleshooting skills, but am fluent in analog. I should have paid attention in computer class rather than playing Space Invaders. |
Thanks Curt. You just need to be patient and follow the schematic with some basic logic, nothing else
John
_________________
Home theater enthusiast for over 20 years !
My dedicated HT room !
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue May 05, 2009 9:23 pm Post subject: |
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I know I have had to replace those RS232 driver ic's (MAXxxx) on many occasions in different displays for a no communication problem. To bad we didn't know for sure if that was the case here.....
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leigh
Joined: 02 Oct 2009
Posts: 3
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| Posted: Mon Oct 05, 2009 6:19 am Post subject: |
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May I ask what is the result regarding to fixing this broken chip? Any solution?
TIA
Regards
Leigh
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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: Mon Oct 05, 2009 1:55 pm Post subject: |
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Nothing. I've been successful repairing other boards in the G90, but have two Ya boards here right now that have issues that can't be repaired. I'm guessing there's at least 8 people that I know of right now looking for working Ya boards.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Oct 05, 2009 2:48 pm Post subject: |
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I was suppose to have a defective chip mailed to me quite some time ago to do some testing on, but I never received it..... 
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Mon Jan 11, 2010 11:15 pm Post subject: |
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Anything new on this ?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jan 11, 2010 11:57 pm Post subject: |
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Maaaaaaybe....... 
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