View previous topic :: View next topic |
Author |
Message |
harry27
Joined: 04 Aug 2019 Posts: 22 Location: Los Angeles, CA, United States
|
Link Posted: Sun Oct 11, 2020 9:30 pm Post subject: Sony VPH-G90 Focus Problems with good IC421?? |
|
|
My Sony VPH-G90 sadly has focus issues on all three tubes. The fine focus controls, specifically the MG focus, AQP, and DQP just isn't working for at least 50% of each tube. I pulled out the YA Board from my projector to find that it has one of the good serial numbers on the IC421, 836A01E. Other details include that the Dallas Chip is about 22 years old and never changed.
Some people told me that it could be another issue on the YA Board that is not related to the IC421 chip, but also have told me that there could be another issue with a different board that relates to focus.
(There are some other issues on my projector, weird outlining, wavy horizontal lines moving, trouble with overscan, and a finger print smudge on the inside of the Red tube lens, but the main issue is the focus)
I'm no expert so I wouldn't know where to start, all advice and help is greatly appreciated!
Description: |
|
Download |
Filename: |
Sony G90 focus.jpg |
Filesize: |
461.28 KB |
Downloaded: |
271 Time(s) |
|
|
Back to top |
|
|
HaydnG90
Joined: 22 May 2006 Posts: 1335
|
Link Posted: Sun Oct 11, 2020 10:36 pm Post subject: |
|
|
Talk the Craig. @CIR Engineering. At this point he is the only person doing board level repairs for the G90. Any error codes?
First though get that Dallas chip copied and replaced. Craig can also do that.
If he can't fix your issue he has spare YA boards.
|
|
Back to top |
|
|
Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24296 Location: Langley, BC
TV/Projector: All of them!
|
Link Posted: Sun Oct 11, 2020 10:37 pm Post subject: |
|
|
Send the YA board to Craig Rounds for testing. Repairs typically run around $1000 US though, not sure what he charges to check the board out. With all of the issues you're describing, yes, the YA board is suspect. Change that Dallas chip too!.
|
|
Back to top |
|
|
HaydnG90
Joined: 22 May 2006 Posts: 1335
|
Link Posted: Sun Oct 11, 2020 10:43 pm Post subject: |
|
|
Curt Palme wrote: | Repairs typically run around $1000 US though, not sure what he charges to check the board out. |
I doubt it. I paid considerably less than that last year to repair an issue with my YA. Replacement YA's with good IC421's are $1K, although the issue is elsewhere in this instance.
|
|
Back to top |
|
|
harry27
Joined: 04 Aug 2019 Posts: 22 Location: Los Angeles, CA, United States
|
Link Posted: Mon Oct 12, 2020 12:39 am Post subject: |
|
|
Thanks HaydnG90! There are thankfully no error codes on the projector. I'm surprised the Dallas chip has lasted this long, but the operational hours of the set is just barely under 10,000 hours (around 9850) and the tubes have about 1850 hours on them.
Hopefully Craig notices this post so he can direct me to the best way to contact him. I tried contacting through his eBay page before, a friend of mine had success that way but I haven't. Hopefully it's as simple as him fixing the YA Board and not an issue with the other boards. I know electrolytic capacitors have a lifespan of about 20 years for CRT monitors, considering these things are all approaching the 20+ year mark so I wouldn't be surprised if it was an issue somewhere else.
Even if the issue is not the YA Board it's worth sending the board in to get the Dallas Chip replaced
|
|
Back to top |
|
|
HaydnG90
Joined: 22 May 2006 Posts: 1335
|
Link Posted: Mon Oct 12, 2020 12:45 am Post subject: |
|
|
harry27 wrote: | Thanks HaydnG90! There are thankfully no error codes on the projector. I'm surprised the Dallas chip has lasted this long, but the operational hours of the set is just barely under 10,000 hours (around 9850) and the tubes have about 1850 hours on them.
Hopefully Craig notices this post so he can direct me to the best way to contact him. I tried contacting through his eBay page before, a friend of mine had success that way but I haven't. Hopefully it's as simple as him fixing the YA Board and not an issue with the other boards. I know electrolytic capacitors have a lifespan of about 20 years for CRT monitors, considering these things are all approaching the 20+ year mark so I wouldn't be surprised if it was an issue somewhere else.
Even if the issue is not the YA Board it's worth sending the board in to get the Dallas Chip replaced |
That Dallas was a time bomb waiting to nuke those low hour tubes. Count yourself lucky. I wouldn't use that set again until the YA is checked out and that Dallas replaced. Craig has stock of genuine blank chips which he can copy your calibration files to the new chip. Contact him through his web page
https://www.cir-engineering.com
|
|
Back to top |
|
|
harry27
Joined: 04 Aug 2019 Posts: 22 Location: Los Angeles, CA, United States
|
Link Posted: Mon Oct 12, 2020 12:55 am Post subject: |
|
|
It seriously was a time bomb, I was shocked when I contacted the seller a month ago to find out it was never replaced. A calibrator by the name of William Phelps set it up for him in 2008. I'm ironically lucky to have been so busy and that the focus problems have stopped me from using the projector for about a year. (There was a power outage a week before removing the YA Board but I don't think that caused any damage)
I'll definitely contact him there, hopefully we can arrange a time for a phone call and sort this all out I'm excited to get it up and running again and finally do a full calibration of the set.
|
|
Back to top |
|
|
HaydnG90
Joined: 22 May 2006 Posts: 1335
|
Link Posted: Mon Oct 12, 2020 12:58 am Post subject: |
|
|
Whats the SN on the Dallas? I have a hard time believing yours is working after 22 yrs more than twice the theoretical life expectancy.
|
|
Back to top |
|
|
harry27
Joined: 04 Aug 2019 Posts: 22 Location: Los Angeles, CA, United States
|
Link Posted: Mon Oct 12, 2020 1:17 am Post subject: |
|
|
HaydnG90 wrote: | Whats the SN on the Dallas? I have a hard time believing yours is working after 22 yrs more than twice the theoretical life expectancy. |
Here is a picture of the Dallas Chip on the YA Board
Description: |
|
Download |
Filename: |
Compressed YA.jpg |
Filesize: |
372.87 KB |
Downloaded: |
274 Time(s) |
|
|
Back to top |
|
|
HaydnG90
Joined: 22 May 2006 Posts: 1335
|
Link Posted: Mon Oct 12, 2020 1:53 am Post subject: |
|
|
Wow, you weren't kidding week 52 1998. That battery must be nuclear powered
|
|
Back to top |
|
|
Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24296 Location: Langley, BC
TV/Projector: All of them!
|
Link Posted: Mon Oct 12, 2020 5:22 pm Post subject: |
|
|
BTW, don't run the set until you put in a new Dallas chip. If the internal battery hits the low critical point while the set is on, you'll spot burn all three tubes. I've seen that a few times, as has Craig Rounds.
|
|
Back to top |
|
|
harry27
Joined: 04 Aug 2019 Posts: 22 Location: Los Angeles, CA, United States
|
Link Posted: Mon Oct 12, 2020 9:49 pm Post subject: |
|
|
Curt Palme wrote: | BTW, don't run the set until you put in a new Dallas chip. If the internal battery hits the low critical point while the set is on, you'll spot burn all three tubes. I've seen that a few times, as has Craig Rounds. |
Thanks Curt! I have isolated the board in a safe area and the projector is both power off and the switch is turned off. I haven't turned on the projector since about a week and a half before I made the post.
Description: |
|
Download |
Filename: |
YA Board Alone.jpg |
Filesize: |
350.04 KB |
Downloaded: |
264 Time(s) |
|
|
Back to top |
|
|
CIR Engineering
Joined: 25 Aug 2008 Posts: 4264 Location: Chicago USA & Berlin Germany
|
Link Posted: Tue Nov 03, 2020 4:33 am Post subject: |
|
|
harry27 wrote: | HaydnG90 wrote: | Whats the SN on the Dallas? I have a hard time believing yours is working after 22 yrs more than twice the theoretical life expectancy. |
Here is a picture of the Dallas Chip on the YA Board |
I can't believe the battery isn't even bulging on that Dallas chip. I hope it still has it's data when it gets to me
craigr
_________________ *NEW JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
X-Rite i1Pro2 Spectroradiometer & Spyder Colorimeters *For JVC auto-calibration when Klein & Jeti are not applicable
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
*NEW Light Illusion ColourSpace XPT Version β Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
*NEW 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
|
|
Back to top |
|
|
harry27
Joined: 04 Aug 2019 Posts: 22 Location: Los Angeles, CA, United States
|
Link Posted: Thu Nov 05, 2020 8:17 pm Post subject: |
|
|
My fingers are crossed! Thankfully I took a picture of all the information ahead of time so even if the anti static bag fails I will still have the important info like tube hours, total operating hours, serial number, and firmware. So that's a silver lining even if it's not ideal.
|
|
Back to top |
|
|
|
|