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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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Link Posted: Wed Feb 14, 2018 5:13 pm Post subject: Sony VPH G90 - are these hours credible? |
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Hi,
In a 2nd hand store I stumbled over a G90.
I could test the unit, without a video source. I managed to get in service mode and read out the hours. To my surprise, total operating was only 1300hrs, and each tube showed just 70hrs. As good as new. But is this credible? With so few hours I would have expected total operating hours and tube hours being identical. Or else they changed tubes at 1230hrs??
Looking throught the lenses with a flashlight did not reveal any mask on the tubes. The unit is running very quiet.
What do you CRT guys think of that? The seller wants something like 500$
regards
Martin
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Wed Feb 14, 2018 5:50 pm Post subject: |
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Could have been in standby mode for most of its life. Not uncommon in a corporate boardroom installation. If the tubes are clean, and it fires up, it's a good deal for $500.
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jbmeyer13
Joined: 03 Dec 2010 Posts: 1135
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Link Posted: Wed Feb 14, 2018 5:54 pm Post subject: Re: Sony VPH G90 - are these hours credible? |
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Apfelmousse wrote: | Hi,
In a 2nd hand store I stumbled over a G90.
I could test the unit, without a video source. I managed to get in service mode and read out the hours. To my surprise, total operating was only 1300hrs, and each tube showed just 70hrs. As good as new. But is this credible? With so few hours I would have expected total operating hours and tube hours being identical. Or else they changed tubes at 1230hrs??
Looking throught the lenses with a flashlight did not reveal any mask on the tubes. The unit is running very quiet.
What do you CRT guys think of that? The seller wants something like 500$
regards
Martin |
If the unit was sitting in standby for long periods it's possible for that to happen. The tube condition is the main concern and if it looks good then offer them $350 and see what happens;-) If you have the proper allen/hex drivers you can remove the screws holding the lenses on and it will be much easier to evaluate the tube faces. At that price point you could part out the projector and make your money back so looks like a good deal.
_________________ Projector: Modded 9501LC ULtra- MP VIM, Vold VNB, ETECH LVPS, Silver VIM Cables, HD10F's & a V1 case!
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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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Link Posted: Wed Feb 14, 2018 6:03 pm Post subject: |
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Ah OK, so standby accounts for operating hours. Didn't know that.
It could be... the seller does not know much about the unit except it came from a car dealers showroom, but must have been de-installed some while ago.
Thanks for your help!
regards
Martin
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Wed Feb 14, 2018 6:28 pm Post subject: |
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First thing is get a new Dallas chip for it. if you can't find one there, I have them here. Mandatory so you don't burn a hole in the tubes.
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HaydnG90
Joined: 22 May 2006 Posts: 1335
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Link Posted: Wed Feb 14, 2018 6:34 pm Post subject: |
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Nice find.
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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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Link Posted: Wed Feb 14, 2018 8:31 pm Post subject: |
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Curt Palme wrote: | First thing is get a new Dallas chip for it. if you can't find one there, I have them here. Mandatory so you don't burn a hole in the tubes. |
I read the threads about it. I think these are the same chips I have in my Tektronix DSA, ticking bombs as they say. But OK until now.
The G90 was produced until 2003, right? So the Dallas will have at least 15 years by now. Is it possible for this chip to still function normally after 15 years?
Nevertheless, according to what I read so far the burning of tubes does not seem to be linked to a memory loosing its content...
regards
Martin
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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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Link Posted: Thu Feb 15, 2018 4:47 am Post subject: |
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What about this information from another menu? Is it an older or a later model?
Serial: 2000065
SW: 1.11
Thanks!
Martin
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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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Link Posted: Thu Feb 15, 2018 4:50 am Post subject: |
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According to what I read, all this info (serial, hours, etc.) are in the Dallas chip. When this chip fails it usually makes the projector inoperable.
But can a weakening Dallas also randomly alter its data?
regards
Martin
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ElTopo
Joined: 07 Nov 2006 Posts: 1608
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Link Posted: Thu Feb 15, 2018 12:16 pm Post subject: |
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I would change the Dallas chip.
_________________ Barco Cine 9 the one and only
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barclay66
Joined: 27 Jun 2011 Posts: 1291 Location: Germany
TV/Projector: Marquee 9500 Ultra
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Link Posted: Thu Feb 15, 2018 2:03 pm Post subject: |
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Apfelmousse wrote: | But can a weakening Dallas also randomly alter its data? |
Yes, that's possible: https://de.wikipedia.org/wiki/NVRAM
Be aware that changing the chip isn't just a simple swap: http://www.curtpalme.com/forum/viewtopic.php?t=9611
Make sure that You buy one with a fresh datecode! Otherwise the battery inside may already have lost some of its charge just by sitting on the shelf...
Regards,
barclay66
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Thu Feb 15, 2018 3:03 pm Post subject: |
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The chip has a lithium battery in it, and if it reaches a critical low voltage while the set is on, the tubes can spot burn. Craig Rounds and I have seen this numerous times over the years. As Barclay says, don't buy a chip off ebay, I've seen a lot of old stock there. I bought my last few in Nov 2017, so mine are really fresh, from 2017.
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HaydnG90
Joined: 22 May 2006 Posts: 1335
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Link Posted: Thu Feb 15, 2018 3:52 pm Post subject: |
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Apfelmousse wrote: | What about this information from another menu? Is it an older or a later model?
Serial: 2000065
SW: 1.11
Thanks!
Martin |
Date (month/year) will be stated on the serial number plate below one of the rear grab handles. Your's is an earlier SN so most like from 1999. Must change that Dallas chip. Fakes are in the market so only buy from a reputable source like Curt or Mouser etc
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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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Link Posted: Thu Feb 15, 2018 9:03 pm Post subject: |
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Hi all,
thanks for all the infos.
One more question: what is the "remote control"? From what I saw in the documentation it looks very much like the thing build in the projector. Can this be taken out somehow and act as remote control, or is the "remote control" a separate item?
regards
Martin
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Fri Feb 16, 2018 1:54 am Post subject: |
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The remote is a separate unit, and a bit hard to find nowadays.
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Apfelmousse
Joined: 26 Apr 2014 Posts: 74 Location: Germany
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HaydnG90
Joined: 22 May 2006 Posts: 1335
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Link Posted: Fri Feb 16, 2018 8:13 pm Post subject: |
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Thats probably a RM-PJ1000. Looks similar but misses some controls that the G90 needs. You want the 1001 version
Personally i would not rest the G90 on the front unless you removed the lenses first. You might want to do this anyway since a lot of the chassis weight is the lenses. Resting the pj on its side will not be problem.
Good deal at ~$400 if your YA board is good and the hours are correct with negligible burn in on the green tube.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Fri Feb 16, 2018 8:30 pm Post subject: |
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That one will work, although I have them for $120 USd incl shipping, which should be less.
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Sat Feb 17, 2018 1:41 am Post subject: |
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Do not let the sun shine into the lenses or it will burn a trail in your C-elements! Keep them covered.
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CRT.
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