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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Tue Jul 10, 2012 7:31 pm Post subject: Totally new G90 problem... or not ;) |
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So I pulled a new to me G90 into my shop yesterday. I powered it up and got a totally garbled menu that could not be read. Some characters were legible, but they were not alphanumeric characters, they looked like something you might find in character map for Windows. I thought "this is strange" and did a factory reset. Problems went away and the projector seemed fine.
Today I go to fire up the projector and it won't start... throws tons of error codes that are different every time I try to power up. Yesterday I had pulled several of the D boards, the BA board, the YA board, and maybe others for trouble shooting another projector. I figured something didn't get seated right or connected back. An hour and a half later I am still scratching my head.
So now I think that it must be a power board issue. I try both power boards and still no go.
So I say what the heck and swap YA boards. Much to my chagrin the machine started and worked fine. I thought oh great, this had better not be a bad IC 421.
But then I look at the Dallas chip and realize that half of it is totally bulged up! The freaking battery must have exploded for some reason, but I have never seen this before. I'll try and take a photo of the chip later, it's unbelievable.
Luckily I had copied this Dallas chip some months back so I wrote it a new and everything is now fine.
Still seeing new things even after servicing these projectors for the past 10 years 
craigr
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www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Tue Jul 10, 2012 8:56 pm Post subject: |
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How old was the dallas chip. Original to the G90 or a replacement. If a replacement where did it come from? Reliable source?
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Tue Jul 10, 2012 10:56 pm Post subject: |
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Old original chip... no worries
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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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Wed Jul 11, 2012 6:30 am Post subject: |
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Wow, can not wait to see the pictures.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Wed Jul 11, 2012 7:53 am Post subject: Re: Totally new G90 problem... or not ;) |
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| CIR Engineering wrote: | | But then I look at the Dallas chip and realize that half of it is totally bulged up! The freaking battery must have exploded for some reason, but I have never seen this before. I'll try and take a photo of the chip later, it's unbelievable. |
Hi,
I'd like to see that picture too!
I could imagine that the chip inside the sealing failed and caused a short on the battery terminals. Thus the battery's energy was converted into heat and caused the deformation...
Regards,
barclay66
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kabuby77
Joined: 28 Mar 2011
Posts: 147
Location: Italy
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| Posted: Wed Jul 11, 2012 2:01 pm Post subject: Re: Totally new G90 problem... or not ;) |
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| CIR Engineering wrote: | | .... The freaking battery must have exploded for some reason... |
Kamikaze chips 
This is the reason why they say that electronic products have a limited life... 
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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: Wed Jul 11, 2012 2:08 pm Post subject: |
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Actually that's pretty common with lithium batteries. I've seen Marquees bubble and also batteries out of RTI remote controls.
I blame the lead content of the solder! 
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Wed Jul 11, 2012 3:26 pm Post subject: |
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| CIR Engineering wrote: | Old original chip... no worries
craigr |
Thats a relief.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Wed Jul 11, 2012 4:24 pm Post subject: |
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| Curt Palme wrote: | | I blame the lead content of the solder! |
Yeah,
Another possible reason could be tin whiskers. Ever heard of that? I remember an interesting site at NASA dealing with this phenomenon. Should show up on Google when searching for the phrase. As a matter of fact I consider a significant percentage of "repairs" performed through reseating boards and chips to it. The movement breaks off the whiskers which cause intermittent shorts...
Regards,
barclay66
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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: Wed Jul 11, 2012 4:37 pm Post subject: |
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Yep, there's a thread here recently about it.
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